BZT52B27-TP Equivalent & Substitute Parts

Part Overview

The BZT52B27-TP is a 27 V Zener diode manufactured by Micro Commercial Co, rated for 410 mW power dissipation in a surface mount SOD-123 package. This component is classified as Active and is ROHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits where precise voltage clamping at 27 V is required. Equivalent and substitute parts are identified based on matching nominal Zener voltage, package type, mounting configuration, and operating temperature range to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Power - Max	410	mW
Tolerance	±2%	-
Package / Case	SOD-123	-
Mounting Type	Surface Mount	-
Operating Temperature	-55°C ~ 175°C	TJ
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the BZT52B27-TP are grouped based on the following substitution criteria:

Primary Matching Parameters:

Nominal Zener voltage of 27 V
Surface mount package type (SOD-123 or SOD-323)
ROHS3 compliance
Forward voltage specification of 900 mV @ 10 mA

Substitution Logic:

Parts are classified into two categories based on power rating compatibility:

Higher Power Rating Substitutes (500 mW): DDZ9711-7, MMSZ4711T1G, MMSZ5254ET1G, SZMMSZ4711T1G, SZMMSZ4711T3G, and SZMMSZ5254ET1G provide increased power dissipation capability while maintaining the 27 V Zener voltage specification. These are suitable for applications requiring higher current handling or thermal margin.
Lower Power Rating Substitutes (200-310 mW): DDZ27D-7 and DDZ27DS-7 provide reduced power ratings. DDZ27DS-7 uses a smaller SOD-323 package, which may require PCB layout modifications.

All substitute parts maintain the 27 V nominal Zener voltage and surface mount configuration. Operating temperature ranges vary between -55°C to -65°C minimum and 150°C to 175°C maximum across the substitute options.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power - Max	Tolerance	Package	Vf (Max) @ If	Operating Temp	RoHS Status
BZT52B27-TP	Micro Commercial Co	27 V	410 mW	±2%	SOD-123	900 mV @ 10 mA	-55°C ~ 175°C	ROHS3 Compliant
DDZ27D-7	Diodes Incorporated	27 V	310 mW	±2.5%	SOD-123	900 mV @ 10 mA	-65°C ~ 150°C	ROHS3 Compliant
DDZ27DS-7	Diodes Incorporated	27 V	200 mW	±2.5%	SOD-323	900 mV @ 10 mA	-65°C ~ 150°C	ROHS3 Compliant
DDZ9711-7	Diodes Incorporated	27 V	500 mW	±5%	SOD-123	900 mV @ 10 mA	-65°C ~ 150°C	ROHS3 Compliant
MMSZ4711T1G	onsemi	27 V	500 mW	±5%	SOD-123	900 mV @ 10 mA	-55°C ~ 150°C	ROHS3 Compliant
MMSZ5254ET1G	onsemi	27 V	500 mW	±5%	SOD-123	900 mV @ 10 mA	-55°C ~ 150°C	ROHS3 Compliant
SZMMSZ4711T1G	onsemi	27 V	500 mW	±5%	SOD-123	900 mV @ 10 mA	-55°C ~ 150°C	ROHS3 Compliant
SZMMSZ4711T3G	onsemi	27 V	500 mW	-	SOD-123	900 mV @ 10 mA	-55°C ~ 150°C	ROHS3 Compliant
SZMMSZ5254ET1G	onsemi	27 V	500 mW	±5%	SOD-123	900 mV @ 10 mA	-55°C ~ 150°C	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Power Rating):

DDZ27D-7 from Diodes Incorporated is the closest functional equivalent, maintaining SOD-123 package compatibility and 27 V Zener voltage. This part is Active status and ROHS3 compliant. The tolerance specification increases to ±2.5% compared to the BZT52B27-TP's ±2%, and the maximum operating temperature is reduced to 150°C. Power rating is 310 mW, which is lower than the original 410 mW specification.

For Higher Power Dissipation Applications:

DDZ9711-7, MMSZ4711T1G, MMSZ5254ET1G, SZMMSZ4711T1G, SZMMSZ4711T3G, and SZMMSZ5254ET1G all provide 500 mW power ratings in SOD-123 packages. All are Active status and ROHS3 compliant. The SZMMSZ series parts (SZMMSZ4711T1G, SZMMSZ4711T3G, SZMMSZ5254ET1G) include automotive-grade qualification per AEC-Q101, suitable for automotive and high-reliability applications.

For Space-Constrained Applications:

DDZ27DS-7 uses the smaller SOD-323 package with 200 mW power rating. This part is suitable only for applications where power dissipation requirements are lower and PCB space is limited. Package change from SOD-123 to SOD-323 requires PCB layout modification.

Temperature Range Considerations:

The BZT52B27-TP operates to 175°C maximum junction temperature. Substitute parts from Diodes Incorporated (DDZ series) and onsemi (MMSZ series) operate to 150°C maximum. Applications requiring operation above 150°C are limited to the original BZT52B27-TP specification.

Frequently Asked Questions (FAQ)

Q: Can DDZ27D-7 be used as a direct replacement for BZT52B27-TP?

A: DDZ27D-7 is functionally compatible for 27 V Zener voltage regulation in SOD-123 surface mount applications. However, the power rating is 310 mW versus 410 mW for the original part. Verify that circuit power dissipation requirements do not exceed 310 mW. The tolerance specification is ±2.5% compared to ±2%, and maximum operating temperature is 150°C versus 175°C.

Q: What is the difference between the 500 mW substitute options?

A: All 500 mW options (DDZ9711-7, MMSZ4711T1G, MMSZ5254ET1G, SZMMSZ4711T1G, SZMMSZ4711T3G, SZMMSZ5254ET1G) maintain 27 V Zener voltage and SOD-123 package compatibility. The SZMMSZ series parts include automotive-grade qualification per AEC-Q101. Impedance specifications vary: DDZ9711-7 does not specify impedance, while MMSZ5254ET1G and SZMMSZ5254ET1G specify 41 Ohms maximum impedance.

Q: Why does DDZ27DS-7 use a different package?

A: DDZ27DS-7 uses the SOD-323 package, which is physically smaller than SOD-123. This package change is accompanied by a reduced power rating of 200 mW. Selection of this part requires PCB layout modification and is suitable only for applications with lower power dissipation requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the BZT52B27-TP.

Q: What is the significance of AEC-Q101 qualification on SZMMSZ series parts?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and qualification. SZMMSZ4711T1G, SZMMSZ4711T3G, and SZMMSZ5254ET1G are qualified to this automotive standard, making them suitable for automotive applications and high-reliability environments where component qualification documentation is required.

Q: Can I use a 500 mW part in place of the 410 mW original?

A: Yes. A higher power rating part can be used in applications designed for the original 410 mW specification. The circuit will operate within the thermal and electrical limits of the higher-rated component. Verify that the tolerance specification (±5% for 500 mW options versus ±2% for the original) is acceptable for the application's voltage regulation requirements.

Q: What is the minimum operating temperature range across all options?

A: The BZT52B27-TP operates from -55°C minimum. Diodes Incorporated parts (DDZ series) operate from -65°C minimum, providing extended low-temperature operation. onsemi parts (MMSZ and SZMMSZ series) operate from -55°C minimum, matching the original specification.

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