diff --git a/esphome/components/xiaomi_cgd1/xiaomi_cgd1.cpp b/esphome/components/xiaomi_cgd1/xiaomi_cgd1.cpp
index 1aa542633a..82a04f0d6e 100644
--- a/esphome/components/xiaomi_cgd1/xiaomi_cgd1.cpp
+++ b/esphome/components/xiaomi_cgd1/xiaomi_cgd1.cpp
@@ -63,17 +63,7 @@ bool XiaomiCGD1::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
   return success;
 }
 
-void XiaomiCGD1::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiCGD1::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_cgd1
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_cgd1/xiaomi_cgd1.h b/esphome/components/xiaomi_cgd1/xiaomi_cgd1.h
index 393795439b..4a34eea32a 100644
--- a/esphome/components/xiaomi_cgd1/xiaomi_cgd1.h
+++ b/esphome/components/xiaomi_cgd1/xiaomi_cgd1.h
@@ -13,7 +13,7 @@ namespace xiaomi_cgd1 {
 class XiaomiCGD1 : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; };
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
   void dump_config() override;
diff --git a/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.cpp b/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.cpp
index a049854935..39ece3e091 100644
--- a/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.cpp
+++ b/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.cpp
@@ -63,17 +63,7 @@ bool XiaomiCGDK2::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
   return success;
 }
 
-void XiaomiCGDK2::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiCGDK2::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_cgdk2
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.h b/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.h
index 1f5ef89869..ed917e2bbd 100644
--- a/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.h
+++ b/esphome/components/xiaomi_cgdk2/xiaomi_cgdk2.h
@@ -13,7 +13,7 @@ namespace xiaomi_cgdk2 {
 class XiaomiCGDK2 : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; };
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
   void dump_config() override;
diff --git a/esphome/components/xiaomi_cgg1/xiaomi_cgg1.cpp b/esphome/components/xiaomi_cgg1/xiaomi_cgg1.cpp
index da4bab6623..448592db16 100644
--- a/esphome/components/xiaomi_cgg1/xiaomi_cgg1.cpp
+++ b/esphome/components/xiaomi_cgg1/xiaomi_cgg1.cpp
@@ -63,17 +63,7 @@ bool XiaomiCGG1::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
   return success;
 }
 
-void XiaomiCGG1::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiCGG1::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_cgg1
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_cgg1/xiaomi_cgg1.h b/esphome/components/xiaomi_cgg1/xiaomi_cgg1.h
index 52904fd75e..c560bddd69 100644
--- a/esphome/components/xiaomi_cgg1/xiaomi_cgg1.h
+++ b/esphome/components/xiaomi_cgg1/xiaomi_cgg1.h
@@ -13,7 +13,7 @@ namespace xiaomi_cgg1 {
 class XiaomiCGG1 : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; }
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
 
diff --git a/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.cpp b/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.cpp
index 2048c786d3..8813f6479b 100644
--- a/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.cpp
+++ b/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.cpp
@@ -1,4 +1,5 @@
 #include "xiaomi_cgpr1.h"
+#include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
 
 #ifdef USE_ESP32
@@ -59,17 +60,7 @@ bool XiaomiCGPR1::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
   return success;
 }
 
-void XiaomiCGPR1::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiCGPR1::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_cgpr1
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.h b/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.h
index 124f9411a1..82bbbfa58d 100644
--- a/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.h
+++ b/esphome/components/xiaomi_cgpr1/xiaomi_cgpr1.h
@@ -16,7 +16,7 @@ class XiaomiCGPR1 : public Component,
                     public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; }
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
 
diff --git a/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.cpp b/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.cpp
index edd9f67f56..2dd60d4ecb 100644
--- a/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.cpp
+++ b/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.cpp
@@ -63,17 +63,7 @@ bool XiaomiLYWSD02MMC::parse_device(const esp32_ble_tracker::ESPBTDevice &device
   return success;
 }
 
-void XiaomiLYWSD02MMC::set_bindkey(const std::string &bindkey) {
-  memset(this->bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    this->bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiLYWSD02MMC::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_lywsd02mmc
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.h b/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.h
index e1e0fcae40..968604fee6 100644
--- a/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.h
+++ b/esphome/components/xiaomi_lywsd02mmc/xiaomi_lywsd02mmc.h
@@ -13,7 +13,7 @@ namespace xiaomi_lywsd02mmc {
 class XiaomiLYWSD02MMC : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { this->address_ = address; }
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
 
diff --git a/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.cpp b/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.cpp
index 2b4b67c92f..b11bbdc40c 100644
--- a/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.cpp
+++ b/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.cpp
@@ -67,17 +67,7 @@ bool XiaomiLYWSD03MMC::parse_device(const esp32_ble_tracker::ESPBTDevice &device
   return success;
 }
 
-void XiaomiLYWSD03MMC::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiLYWSD03MMC::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_lywsd03mmc
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.h b/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.h
index 3c7907479a..d890e5ed12 100644
--- a/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.h
+++ b/esphome/components/xiaomi_lywsd03mmc/xiaomi_lywsd03mmc.h
@@ -13,7 +13,7 @@ namespace xiaomi_lywsd03mmc {
 class XiaomiLYWSD03MMC : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; };
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
   void dump_config() override;
diff --git a/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.cpp b/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.cpp
index e1b808c54e..10cd15ddbd 100644
--- a/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.cpp
+++ b/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.cpp
@@ -67,17 +67,7 @@ bool XiaomiMHOC401::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
   return success;
 }
 
-void XiaomiMHOC401::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiMHOC401::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_mhoc401
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.h b/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.h
index 1acdaa88af..13547e45d9 100644
--- a/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.h
+++ b/esphome/components/xiaomi_mhoc401/xiaomi_mhoc401.h
@@ -13,7 +13,7 @@ namespace xiaomi_mhoc401 {
 class XiaomiMHOC401 : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; };
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
   void dump_config() override;
diff --git a/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.cpp b/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.cpp
index eb4862a7e9..ec03c851cd 100644
--- a/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.cpp
+++ b/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.cpp
@@ -1,4 +1,5 @@
 #include "xiaomi_mjyd02yla.h"
+#include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
 
 #ifdef USE_ESP32
@@ -62,17 +63,7 @@ bool XiaomiMJYD02YLA::parse_device(const esp32_ble_tracker::ESPBTDevice &device)
   return success;
 }
 
-void XiaomiMJYD02YLA::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiMJYD02YLA::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_mjyd02yla
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.h b/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.h
index e1b4055696..bf9dcaf844 100644
--- a/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.h
+++ b/esphome/components/xiaomi_mjyd02yla/xiaomi_mjyd02yla.h
@@ -16,7 +16,7 @@ class XiaomiMJYD02YLA : public Component,
                         public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; }
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
 
diff --git a/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.cpp b/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.cpp
index d5b89507fe..ee3ad316e1 100644
--- a/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.cpp
+++ b/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.cpp
@@ -79,17 +79,7 @@ bool XiaomiRTCGQ02LM::parse_device(const esp32_ble_tracker::ESPBTDevice &device)
   return success;
 }
 
-void XiaomiRTCGQ02LM::set_bindkey(const std::string &bindkey) {
-  memset(bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiRTCGQ02LM::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_rtcgq02lm
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.h b/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.h
index ae00a28ac9..87dfc0b62b 100644
--- a/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.h
+++ b/esphome/components/xiaomi_rtcgq02lm/xiaomi_rtcgq02lm.h
@@ -19,7 +19,7 @@ namespace xiaomi_rtcgq02lm {
 class XiaomiRTCGQ02LM : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { address_ = address; };
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;
   void dump_config() override;
diff --git a/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.cpp b/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.cpp
index f126e8bdfd..50cf5f2d76 100644
--- a/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.cpp
+++ b/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.cpp
@@ -67,17 +67,7 @@ bool XiaomiXMWSDJ04MMC::parse_device(const esp32_ble_tracker::ESPBTDevice &devic
   return success;
 }
 
-void XiaomiXMWSDJ04MMC::set_bindkey(const std::string &bindkey) {
-  memset(this->bindkey_, 0, 16);
-  if (bindkey.size() != 32) {
-    return;
-  }
-  char temp[3] = {0};
-  for (int i = 0; i < 16; i++) {
-    strncpy(temp, &(bindkey.c_str()[i * 2]), 2);
-    this->bindkey_[i] = std::strtoul(temp, nullptr, 16);
-  }
-}
+void XiaomiXMWSDJ04MMC::set_bindkey(const char *bindkey) { parse_hex(bindkey, this->bindkey_, sizeof(this->bindkey_)); }
 
 }  // namespace xiaomi_xmwsdj04mmc
 }  // namespace esphome
diff --git a/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.h b/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.h
index ed0458ce49..22cac63059 100644
--- a/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.h
+++ b/esphome/components/xiaomi_xmwsdj04mmc/xiaomi_xmwsdj04mmc.h
@@ -13,7 +13,7 @@ namespace xiaomi_xmwsdj04mmc {
 class XiaomiXMWSDJ04MMC : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
  public:
   void set_address(uint64_t address) { this->address_ = address; }
-  void set_bindkey(const std::string &bindkey);
+  void set_bindkey(const char *bindkey);
 
   bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override;