TZMB27-GS18 Equivalent & Substitute Parts

Part Overview

The TZMB27-GS18 is a Zener diode rated at 27 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component is packaged in SOD-80 MiniMELF configuration and is qualified to AEC-Q101 automotive standards. The part is currently active in production with 1064 units in stock. Substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across the same product series, enabling seamless integration in circuit designs where component availability or supply chain considerations necessitate alternative sourcing.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±2%	—
Power - Max	500	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 20 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TZMB27-GS18 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part TZMB27-GS08 maintains identical specifications in the following key areas:

Zener voltage: 27 V nominal
Tolerance: ±2%
Maximum power dissipation: 500 mW
Maximum impedance: 80 Ohms
Reverse leakage current: 100 nA @ 20 V
Forward voltage: 1.5 V @ 200 mA
Operating temperature range: -65°C to 175°C
Package configuration: SOD-80 MiniMELF (DO-213AC)
Mounting type: Surface Mount
Automotive grade with AEC-Q101 qualification
RoHS3 compliance and MSL 1 rating

Both parts belong to the TZM series and share the base product number TZMB27. The substitution is valid because all electrical performance characteristics and environmental qualifications are identical, ensuring functional and mechanical interchangeability in circuit applications.

Parameter Comparison

Parameter	TZMB27-GS18	TZMB27-GS08	Match
Voltage - Zener (Nom)	27 V	27 V	✓
Tolerance	±2%	±2%	✓
Power - Max	500 mW	500 mW	✓
Impedance (Max)	80 Ohms	80 Ohms	✓
Current - Reverse Leakage @ Vr	100 nA @ 20 V	100 nA @ 20 V	✓
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	✓
Operating Temperature Range	-65 to 175°C	-65 to 175°C	✓
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	✓
Mounting Type	Surface Mount	Surface Mount	✓
Grade	Automotive	Automotive	✓
Qualification	AEC-Q101	AEC-Q101	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	✓
Series	TZM	TZM	✓
Base Product Number	TZMB27	TZMB27	✓

Engineering Selection Recommendations

Both TZMB27-GS18 and TZMB27-GS08 are active production parts manufactured by Vishay General Semiconductor - Diodes Division and carry identical AEC-Q101 automotive qualifications. Selection between these parts is based on availability and supply chain requirements rather than electrical or mechanical performance differences.

The TZMB27-GS18 is currently stocked at 1064 units, while the TZMB27-GS08 maintains higher inventory at 40300 units. Both parts comply with ROHS3 regulations, carry REACH Unaffected status, and are classified under ECCN EAR99 with HTSUS code 8541.10.0050. The MSL 1 rating for both parts indicates unlimited shelf life under standard storage conditions.

For applications requiring automotive-grade Zener diodes with 27 V regulation at 500 mW power dissipation in SOD-80 MiniMELF surface mount packages, either part number provides equivalent performance and reliability. Selection should be determined by procurement lead times and inventory availability at the point of component sourcing.

Frequently Asked Questions (FAQ)

Q: Are TZMB27-GS18 and TZMB27-GS08 electrically identical?

A: Yes. Both parts share identical electrical specifications including 27 V nominal Zener voltage, ±2% tolerance, 500 mW maximum power dissipation, 80 Ohms maximum impedance, and identical forward and reverse leakage characteristics across the full operating temperature range of -65°C to 175°C.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. Both parts are packaged in SOD-80 MiniMELF (DO-213AC) configuration with surface mount mounting type. The mechanical footprint and lead configuration are identical, enabling direct substitution without PCB layout modifications.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both TZMB27-GS18 and TZMB27-GS08 carry automotive grade classification and AEC-Q101 qualification, meeting the same reliability and performance standards for automotive applications.

Q: What is the difference between these two part numbers?

A: The part numbers differ only in their internal Vishay designation suffix (-GS18 versus -GS08). This distinction does not reflect any difference in electrical performance, mechanical configuration, or qualification status. The difference is internal to Vishay's manufacturing and inventory tracking systems.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH Unaffected, classified as EAR99, and carry identical HTSUS coding. Moisture sensitivity level is MSL 1 for both parts, indicating unlimited shelf life under standard storage conditions.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection should be based on current inventory availability and procurement lead times. Both parts are active in production with no planned obsolescence.

Q: Are there any temperature or environmental performance differences?

A: No. Both parts operate across the identical temperature range of -65°C to 175°C with identical electrical characteristics maintained throughout this range.

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