TZMC33-GS18 Equivalent & Substitute Parts

Part Overview

The TZMC33-GS18 is a 33 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the SOD-80 MiniMELF package and is qualified to AEC-Q101 automotive standards. The part is currently active in production with 814 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or inventory availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 24 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature	175	°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the TZMC33-GS18 are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Zener voltage: 33 V nominal
Power dissipation: 500 mW maximum
Tolerance: ±5%
Package: SOD-80 MiniMELF (DO-213AC)
Mounting: Surface mount
Compliance: RoHS3 compliant

Parametric Equivalents maintain identical or functionally equivalent specifications across all critical electrical parameters. These parts are interchangeable in applications where the original part number is unavailable.

Manufacturer Recommended Substitutes meet the core electrical requirements but may exhibit variations in secondary parameters such as impedance, forward voltage, or operating temperature range. These variations remain within acceptable tolerances for the zener diode category and do not compromise circuit functionality.

Parameter Comparison

Parameter	TZMC33-GS18	TZMC33-GS08	CLL5257B TR PBFREE
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Central Semiconductor Corp
Voltage - Zener (Nom)	33 V	33 V	33 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	80 Ohms	80 Ohms	58 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 24 V	100 nA @ 24 V	100 nA @ 25 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.25 V @ 200 mA
Operating Temperature	175°C	175°C	−65°C ~ 200°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

TZMC33-GS08 is a parametric equivalent manufactured by Vishay General Semiconductor. This part maintains identical electrical specifications to the TZMC33-GS18 across all critical parameters including zener voltage, power rating, impedance, and reverse leakage current. Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. The TZMC33-GS08 is suitable for direct substitution in applications where the original part number is unavailable. Current inventory for TZMC33-GS08 is 29,925 units.

CLL5257B TR PBFREE is a manufacturer-recommended substitute produced by Central Semiconductor Corp. This part meets the core electrical requirements of 33 V zener voltage, 500 mW power dissipation, and ±5% tolerance. The CLL5257B exhibits lower impedance (58 Ohms versus 80 Ohms) and lower forward voltage (1.25 V versus 1.5 V at 200 mA), representing improved performance characteristics. The operating temperature range extends to −65°C to 200°C, providing broader thermal coverage. All three parts share identical package specifications (SOD-80 MiniMELF), RoHS3 compliance, and MSL rating. Current inventory for CLL5257B TR PBFREE is 12,492 units.

Frequently Asked Questions (FAQ)

Q: Can TZMC33-GS08 be used as a direct replacement for TZMC33-GS18?

A: Yes. The TZMC33-GS08 is a parametric equivalent with identical electrical specifications. Both parts are manufactured by Vishay General Semiconductor, share the same zener voltage (33 V), power rating (500 mW), tolerance (±5%), impedance (80 Ohms), and package (SOD-80 MiniMELF). No circuit modifications are required.

Q: What are the differences between TZMC33-GS18 and CLL5257B TR PBFREE?

A: The primary differences are manufacturer and secondary electrical parameters. The CLL5257B exhibits lower impedance (58 Ohms versus 80 Ohms) and lower forward voltage (1.25 V versus 1.5 V at 200 mA). The CLL5257B also provides an extended operating temperature range (−65°C to 200°C versus 175°C maximum). Core specifications—zener voltage, power rating, tolerance, and package—are identical.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the SOD-80 MiniMELF package (DO-213AC), which defines identical mechanical dimensions and land pattern requirements. No PCB redesign is necessary when substituting between these parts.

Q: Do all substitute parts meet automotive qualification requirements?

A: TZMC33-GS18 and TZMC33-GS08 both carry AEC-Q101 automotive qualification. CLL5257B TR PBFREE does not list AEC-Q101 qualification in the provided specifications. For applications requiring automotive qualification, TZMC33-GS08 is the appropriate substitute.

Q: What is the impedance difference between TZMC33-GS18 and CLL5257B TR PBFREE?

A: TZMC33-GS18 specifies 80 Ohms maximum impedance, while CLL5257B TR PBFREE specifies 58 Ohms maximum impedance. Lower impedance results in improved voltage regulation and reduced output impedance in zener regulator circuits.

Q: Are all parts RoHS3 compliant?

A: Yes. TZMC33-GS18, TZMC33-GS08, and CLL5257B TR PBFREE are all ROHS3 compliant with MSL rating of 1 (Unlimited).

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