TZMB43-GS08 Equivalent & Substitute Parts

Part Overview

The TZMB43-GS08 is a Zener diode rated at 43 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates across the temperature range of -65°C to 175°C and is qualified to AEC-Q101 automotive standards. The part is currently active in production with substantial inventory availability. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the same functional category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±2%	—
Power - Max	500	mW
Impedance (Max)	90	Ohms
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the TZMB43-GS08 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Nom): 43 V
Tolerance: ±2%
Power rating: 500 mW
Package compatibility: DO-213AC, MINI-MELF, SOD-80
Mounting type: Surface Mount

Compliance & Environmental Criteria:

RoHS3 compliance
Operating temperature range compatibility
Moisture sensitivity level (MSL 1 - Unlimited)

The BZV55-B43,115 meets all electrical equivalence criteria with identical nominal zener voltage, tolerance, and power rating. Both components share the same package designation and surface mount configuration, enabling direct substitution in circuit designs. Compliance certifications align across both parts, supporting interchangeability in regulated applications.

Parameter Comparison

Parameter	TZMB43-GS08 (Vishay)	BZV55-B43,115 (Nexperia)	Match Status
Voltage - Zener (Nom)	43 V	43 V	Equivalent
Tolerance	±2%	±2%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	90 Ohms	150 Ohms	Substitute Rated Higher
Current - Reverse Leakage @ Vr	100 nA @ 33 V	50 nA @ 30.1 V	Substitute Lower
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	900 mV @ 10 mA	Different Test Conditions
Operating Temperature Range	-65 to 175°C	-65 to 200°C	Substitute Extended Upper
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

TZMB43-GS08 (Vishay General Semiconductor - Diodes Division)

Select this part when:

AEC-Q101 automotive qualification is required
Operating temperature ceiling of 175°C is sufficient
Lower impedance specification (90 Ohms max) is a design requirement
Vishay supply chain or qualification documentation is mandated

BZV55-B43,115 (Nexperia USA Inc.)

Select this part when:

Extended operating temperature range to 200°C is required
Lower reverse leakage current specification is beneficial
Nexperia component qualification is acceptable
Supply availability or cost considerations favor this manufacturer

Both parts maintain ROHS3 compliance, unlimited moisture sensitivity rating, and identical electrical performance at the nominal 43 V zener voltage with ±2% tolerance. The choice between these components is driven by application temperature requirements, manufacturer qualification status, and supply chain constraints rather than functional incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B43,115 directly replace the TZMB43-GS08 in existing designs?

A: Yes. Both components share identical nominal zener voltage (43 V), tolerance (±2%), power rating (500 mW), and package designation (DO-213AC, MINI-MELF, SOD-80). Surface mount footprints are compatible. The substitute part operates across a wider temperature range (-65 to 200°C versus -65 to 175°C), making it suitable for applications requiring extended high-temperature performance.

Q: What is the significance of the impedance difference between these parts?

A: The TZMB43-GS08 specifies maximum impedance of 90 Ohms, while the BZV55-B43,115 specifies 150 Ohms. Impedance affects transient response and noise filtering characteristics. Applications requiring the lower impedance specification must use the TZMB43-GS08. Applications without specific impedance constraints can use either part.

Q: Are there automotive qualification differences between these parts?

A: The TZMB43-GS08 carries AEC-Q101 automotive qualification. The BZV55-B43,115 qualification status is not specified in the provided data. Designs requiring explicit AEC-Q101 certification must use the TZMB43-GS08.

Q: Do these parts require different PCB footprints?

A: No. Both components use the DO-213AC, MINI-MELF, SOD-80 package designation with surface mount configuration. PCB footprints and reflow soldering profiles are identical.

Q: What is the reverse leakage current difference, and does it matter?

A: The TZMB43-GS08 specifies 100 nA @ 33 V, while the BZV55-B43,115 specifies 50 nA @ 30.1 V. The substitute part exhibits lower leakage. This difference is significant only in applications where leakage current directly impacts circuit performance, such as precision analog circuits or high-impedance measurement systems.

Q: Can I use the BZV55-B43,115 in applications rated for -65 to 175°C operation?

A: Yes. The BZV55-B43,115 operates across -65 to 200°C, which encompasses the -65 to 175°C range. The extended upper temperature limit provides additional design margin without compromising performance in the lower temperature range.

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