ZMM5246B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5246B-7 is a Zener diode rated at 16 V, 500 mW with ±5% tolerance, manufactured by Diodes Incorporated in Mini MELF surface mount packaging. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts maintain the core electrical specifications while offering alternative package configurations and active product status from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 12 V
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 175°C	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ZMM5246B-7 is determined by strict equivalence in the following electrical parameters: nominal Zener voltage (16 V), power dissipation rating (500 mW), tolerance (±5%), impedance (17 Ohms maximum), and reverse leakage current (100 nA @ 12 V). All substitute parts maintain these core electrical specifications. Package configuration differences (Mini MELF, SOD-123, SOD-80, DO-213AA, DO-213AB) represent the primary variation among substitutes and must be evaluated against board layout and thermal management requirements. Operating temperature range, RoHS compliance status, and product status (active versus obsolete) are secondary selection criteria based on application requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Package	Product Status	RoHS
ZMM5246B-7	Diodes Incorporated	16 V	±5%	500 mW	17 Ω	100 nA @ 12 V	Mini MELF	Obsolete	ROHS3
MMSZ5246B-7-F	Diodes Incorporated	16 V	±5%	500 mW	17 Ω	100 nA @ 12 V	SOD-123	Active	ROHS3
CZRL5246B	Comchip Technology	16 V	±5%	500 mW	17 Ω	100 nA @ 12 V	SOD-80 MiniMELF	Active	ROHS3
1N5246BUR-1	Microchip Technology	16 V	±5%	500 mW	17 Ω	100 nA @ 12 V	DO-213AA	Active	Non-compliant
CDLL5246B	Microchip Technology	16 V	±5%	—	17 Ω	100 nA @ 12 V	DO-213AB MELF	Active	Non-compliant
TZMC16-GS08	Vishay General Semiconductor	16 V	±5%	500 mW	40 Ω	100 nA @ 12 V	SOD-80 MiniMELF	Active	ROHS3

Engineering Selection Recommendations

Primary Substitute (Manufacturer Recommended): MMSZ5246B-7-F from Diodes Incorporated is the manufacturer-recommended substitute. This part maintains identical electrical specifications and RoHS3 compliance with the original ZMM5246B-7. The transition from Mini MELF to SOD-123 packaging requires PCB layout modification but offers superior availability (45,300 units in stock) and active product status.

Package-Compatible Alternative: CZRL5246B from Comchip Technology maintains the Mini MELF package form factor identical to the original ZMM5246B-7, enabling direct board-level substitution without layout changes. This part is active, RoHS3 compliant, and carries 1,091 units in stock.

Automotive-Grade Option: TZMC16-GS08 from Vishay General Semiconductor provides AEC-Q101 automotive qualification and active status with 17,900 units available. This part differs in impedance specification (40 Ohms maximum versus 17 Ohms) and requires thermal performance evaluation for applications with stringent impedance requirements.

RoHS Non-Compliant Alternatives: CDLL5246B and 1N5246BUR-1 maintain electrical equivalence but carry RoHS non-compliant status. These parts are suitable only for applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5246B-7-F directly replace ZMM5246B-7 on the PCB?

A: MMSZ5246B-7-F provides electrical equivalence but requires PCB layout modification due to package change from Mini MELF to SOD-123. The smaller SOD-123 footprint necessitates redesign of the component placement area.

Q: What is the primary difference between CZRL5246B and MMSZ5246B-7-F?

A: Both parts maintain identical electrical specifications (16 V, 500 mW, ±5%, 17 Ω impedance). CZRL5246B retains the Mini MELF package matching the original ZMM5246B-7, while MMSZ5246B-7-F uses SOD-123 packaging. MMSZ5246B-7-F offers higher inventory availability.

Q: Why does TZMC16-GS08 show 40 Ohms impedance instead of 17 Ohms?

A: TZMC16-GS08 is specified with maximum impedance of 40 Ohms, which differs from the 17 Ohms specification of ZMM5246B-7. This parameter variation may affect circuit performance in applications with impedance-sensitive requirements and requires circuit analysis before substitution.

Q: Are CDLL5246 and CDLL5246A suitable substitutes?

A: CDLL5246 carries ±20% tolerance and CDLL5246A carries ±10% tolerance, both differing from the original ±5% specification. These parts are not equivalent substitutes for applications requiring ±5% tolerance accuracy.

Q: What is the impact of RoHS non-compliance for 1N5246BUR-1 and CDLL5246B?

A: RoHS non-compliant parts are restricted in applications subject to RoHS regulations (EU Directive 2011/65/EU and amendments). Use these parts only in applications where RoHS compliance is not a contractual or regulatory requirement.

Q: Can I use CDLL5246B as a direct replacement for ZMM5246B-7?

A: CDLL5246B maintains the ±5% tolerance and 16 V rating but lacks specified power dissipation data in the provided parameters. The DO-213AB MELF package differs from Mini MELF, requiring PCB layout evaluation. RoHS non-compliance status must be verified against application requirements.

Q: Which substitute offers the best inventory availability?

A: MMSZ5246B-7-F provides the highest inventory level at 45,300 units in stock, followed by TZMC16-GS08 at 17,900 units. CZRL5246B offers 1,091 units with package compatibility to the original part.

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