BZT52B10-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The BZT52B10-TP is a 10 V, 410 mW surface mount Zener diode manufactured by Micro Commercial Co in SOD-123 packaging. This component is classified as Active and is ROHS3 compliant. Zener diodes in this voltage and power rating are widely used in voltage regulation, overvoltage protection, and reference circuits. Equivalent and substitute parts may be required due to supply chain availability, packaging format preferences, or specific application requirements such as automotive qualification or enhanced thermal performance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Power - Max	410	mW
Tolerance	±2%	-
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 7.5 V	-
Voltage - Forward (Max) @ If	900 mV @ 10 mA	-
Operating Temperature	-55°C to 175°C	-
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the BZT52B10-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 10 V nominal
Package type: SOD-123 or compatible surface mount package
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant

Secondary Compatibility Factors:

Power dissipation rating: 410 mW or higher
Operating temperature range: Must encompass application requirements
Voltage tolerance: ±2% to ±6% acceptable for most applications
Impedance and leakage characteristics: Within acceptable ranges for voltage regulation function

Substitute parts are grouped into two categories:

Category A - Direct SOD-123 Replacements (Same Package): Parts maintaining SOD-123 packaging with 10 V nominal voltage and power ratings of 410 mW or greater. These include BZT52C10-7-F, MMSZ5240B-HE3-08, MMSZ5240BT1G, and SZMMSZ5240BT1G.

Category B - Alternative Package (SOD-523): Part BZT52C10T-7 uses SOD-523 packaging with reduced power rating (300 mW). This substitution is valid only when board space constraints permit package change and power dissipation requirements do not exceed 300 mW.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Package	Temp Range	Status	Automotive Grade
BZT52B10-TP	Micro Commercial Co	10 V	410 mW	±2%	15 Ω	SOD-123	-55°C to 175°C	Active	No
BZT52C10-7-F	Diodes Incorporated	10 V	500 mW	±6%	20 Ω	SOD-123	-65°C to 150°C	Active	No
BZT52C10T-7	Diodes Incorporated	10 V	300 mW	±6%	20 Ω	SOD-523	-65°C to 150°C	Active	No
MMSZ5240B-HE3-08	Vishay General Semiconductor	10 V	500 mW	±5%	17 Ω	SOD-123	-55°C to 150°C	Obsolete	Yes (AEC-Q101)
MMSZ5240BT1G	onsemi	10 V	500 mW	±5%	17 Ω	SOD-123	-55°C to 150°C	Active	No
SZMMSZ5240BT1G	onsemi	10 V	500 mW	±5%	17 Ω	SOD-123	-55°C to 150°C	Active	Yes (AEC-Q101)

Engineering Selection Recommendations

For Standard Industrial Applications: BZT52C10-7-F (Diodes Incorporated) and MMSZ5240BT1G (onsemi) are preferred substitutes. Both maintain SOD-123 packaging, provide 500 mW power dissipation (exceeding the 410 mW requirement), and are Active status products with high inventory availability. These parts are suitable for general voltage regulation and protection circuits.

For Automotive Applications: SZMMSZ5240BT1G (onsemi) is the recommended substitute. This part carries AEC-Q101 automotive qualification, maintains SOD-123 packaging, provides 500 mW power dissipation, and is Active status. The automotive-grade designation ensures compliance with automotive reliability and environmental standards.

For Legacy System Maintenance: MMSZ5240B-HE3-08 (Vishay) provides automotive qualification (AEC-Q101) but carries Obsolete product status. This part should be used only when existing designs specifically require Vishay components and supply is confirmed available.

For Space-Constrained Designs: BZT52C10T-7 (Diodes Incorporated) offers SOD-523 packaging with reduced footprint. This substitution is valid only when power dissipation does not exceed 300 mW and board layout permits the package change.

Frequently Asked Questions (FAQ)

Q: Can BZT52B10-TP be directly replaced with BZT52C10-7-F?

A: Yes. Both parts maintain 10 V nominal Zener voltage, SOD-123 packaging, and surface mount configuration. BZT52C10-7-F provides higher power dissipation (500 mW vs. 410 mW) and is Active status. Voltage tolerance difference (±6% vs. ±2%) is acceptable for most voltage regulation applications.

Q: What is the difference between MMSZ5240BT1G and SZMMSZ5240BT1G?

A: Both parts are manufactured by onsemi with identical electrical specifications (10 V, 500 mW, SOD-123). The primary difference is that SZMMSZ5240BT1G carries AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging, while MMSZ5240BT1G is standard industrial grade in Cut Tape & Digi-Reel packaging. Select SZMMSZ5240BT1G for automotive applications.

Q: Why is BZT52C10T-7 listed as a substitute if it uses a different package?

A: BZT52C10T-7 uses SOD-523 packaging instead of SOD-123. This part is a valid substitute only when board space constraints permit package change and application power dissipation does not exceed 300 mW. PCB layout modifications are required for this substitution.

Q: Is MMSZ5240B-HE3-08 still available for new designs?

A: MMSZ5240B-HE3-08 carries Obsolete product status. While inventory is currently available (28,675 pcs), this part should not be selected for new designs. Use SZMMSZ5240BT1G (Active, automotive-qualified) or MMSZ5240BT1G (Active, industrial) instead.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Zener voltage matching at 10 V nominal, (2) Power dissipation rating equal to or exceeding 410 mW, (3) Surface mount configuration, (4) SOD-123 or compatible package, and (5) ROHS3 compliance. Operating temperature range and voltage tolerance are secondary factors dependent on specific application requirements.

Q: Can I use a substitute part with higher impedance (Zzt)?

A: Impedance differences (15 Ω to 20 Ω) are acceptable for most voltage regulation applications. Higher impedance results in slightly increased output impedance in the Zener regulation circuit. Verify impedance specifications against circuit design requirements before substitution.

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