ZMM5262B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5262B-7 is a Zener diode rated at 51 V nominal voltage with 500 mW maximum power dissipation, manufactured by Diodes Incorporated in a Surface Mount Mini MELF package (DO-213AC, SOD-80). This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Equivalent parts maintain identical electrical specifications and package compatibility, while substitute parts offer functional equivalence with potential package or tolerance variations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	51	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	125	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 39 V	-
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	-
Operating Temperature Range	-65°C to 175°C	-
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the ZMM5262B-7 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 51 V nominal
Power rating: 500 mW maximum
Tolerance: ±5% (primary specification)
Impedance: 125 Ohms maximum
Reverse leakage current: 100 nA @ 39 V
Forward voltage: 1.5 V @ 200 mA maximum
Operating temperature: -65°C to 175°C
Mounting type: Surface Mount
Package compatibility: DO-213AC, MINI-MELF, SOD-80

Substitute Categories:

Category 1: Parametric Equivalents (Identical Electrical Specifications) Parts meeting all primary substitution criteria with matching tolerance and electrical characteristics. These include TZM5262B-GS08, TZM5262B-GS18, and CDLL5262A.

Category 2: Manufacturer Recommended Alternatives (Active Status) Parts with identical zener voltage and power rating but different package configurations or tolerance specifications. These include 1N5262BUR-1 (DO-213AA package), CDLL5262 (±20% tolerance), CDLL5262B (±5% tolerance), and TLZ51-GS08/GS18 (100 Ohms impedance).

Category 3: Functional Equivalents with Tolerance Variations Parts maintaining core electrical performance with relaxed tolerance specifications, suitable for applications where ±5% tolerance is not mandatory.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf @ 200mA	Package	Product Status	RoHS
ZMM5262B-7	Diodes Incorporated	51 V	±5%	500 mW	125 Ω	1.5 V	DO-213AC, MINI-MELF, SOD-80	Obsolete	ROHS3
TZM5262B-GS08	Vishay General Semiconductor	51 V	±5%	500 mW	125 Ω	1.1 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3
TZM5262B-GS18	Vishay General Semiconductor	51 V	±5%	500 mW	125 Ω	1.1 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3
TZMB51-GS08	Vishay General Semiconductor	51 V	±2%	500 mW	125 Ω	1.5 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3
CDLL5262A	Microchip Technology	51 V	±10%	-	125 Ω	1.1 V	DO-213AB, MELF	Active	Non-compliant
CDLL5262B	Microchip Technology	51 V	±5%	-	125 Ω	1.1 V	DO-213AB, MELF	Active	Non-compliant
1N5262BUR-1	Microchip Technology	51 V	±5%	500 mW	125 Ω	1.1 V	DO-213AA	Active	Non-compliant
TLZ51-GS08	Vishay General Semiconductor	51 V	-	500 mW	100 Ω	1.5 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3
TLZ51-GS18	Vishay General Semiconductor	51 V	-	500 mW	100 Ω	1.5 V	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: TZM5262B-GS08 or TZM5262B-GS18

These Vishay parts are parametric equivalents with identical electrical specifications to the ZMM5262B-7. Both maintain 51 V nominal zener voltage, ±5% tolerance, 500 mW power rating, and 125 Ohms impedance. Both are ROHS3 compliant and active products. The primary difference is packaging configuration (GS08 vs. GS18 tape reel specifications). TZM5262B-GS08 offers higher inventory availability (13,386 pcs) compared to TZM5262B-GS18 (700 pcs).

Secondary Recommendation: TZMB51-GS08

This Vishay part offers tighter tolerance (±2%) and automotive-grade qualification (AEC-Q101), suitable for applications requiring enhanced precision and reliability. Electrical specifications match the primary part with identical package compatibility. ROHS3 compliant and active status.

Alternative for RoHS Non-Compliant Applications: CDLL5262B

Microchip Technology CDLL5262B maintains ±5% tolerance and 51 V zener voltage with 125 Ohms impedance. Package differs (DO-213AB MELF vs. DO-213AC Mini MELF), requiring PCB layout verification. RoHS non-compliant status limits use to legacy or non-regulated applications.

Package-Specific Alternative: 1N5262BUR-1

Microchip Technology part with identical electrical specifications but DO-213AA package configuration. Suitable only where DO-213AA footprint compatibility exists. RoHS non-compliant.

Lower Impedance Option: TLZ51-GS08 or TLZ51-GS18

Vishay parts with 100 Ohms maximum impedance (vs. 125 Ohms specification). Maintains 51 V, 500 mW, and identical package. ROHS3 compliant and active. Suitable where lower impedance provides circuit performance advantage.

Frequently Asked Questions (FAQ)

Q: Can TZM5262B-GS08 directly replace ZMM5262B-7 without PCB modification?

A: Yes. Both parts use identical DO-213AC, MINI-MELF, SOD-80 package configuration. Electrical specifications match within the ±5% tolerance specification. No PCB layout changes required.

Q: What is the difference between TZM5262B-GS08 and TZM5262B-GS18?

A: Both parts are electrically identical. The suffix designates tape reel specifications (GS08 vs. GS18 refer to packaging configurations). Selection depends on procurement and assembly equipment compatibility.

Q: Is CDLL5262B suitable as a direct replacement?

A: CDLL5262B maintains identical electrical specifications (51 V, ±5% tolerance, 125 Ohms impedance). However, the package differs (DO-213AB MELF vs. DO-213AC Mini MELF). PCB footprint compatibility must be verified before substitution. RoHS non-compliant status may restrict use in regulated applications.

Q: Why does TZMB51-GS08 have ±2% tolerance instead of ±5%?

A: TZMB51-GS08 is an automotive-grade part (AEC-Q101 qualified) with tighter tolerance specifications. This provides enhanced precision for applications requiring stricter voltage regulation. It is a direct functional upgrade with identical package and power rating.

Q: What is the significance of the forward voltage difference between parts?

A: Forward voltage (Vf) specifications range from 1.1 V to 1.5 V across equivalent parts. This parameter affects reverse-bias leakage characteristics and thermal performance. For most applications, this variation is within acceptable circuit design margins. Verify against specific circuit requirements if forward voltage is a critical design parameter.

Q: Can TLZ51-GS08 be used where 125 Ohms impedance is specified?

A: TLZ51-GS08 has 100 Ohms maximum impedance, which is lower than the 125 Ohms specification. Lower impedance provides improved voltage regulation and reduced noise. This is generally beneficial for circuit performance but must be verified against specific application requirements.

Q: Are all recommended substitutes ROHS3 compliant?

A: Vishay parts (TZM5262B-GS08, TZM5262B-GS18, TZMB51-GS08, TLZ51-GS08, TLZ51-GS18) are ROHS3 compliant. Microchip parts (1N5262BUR-1, CDLL5262A, CDLL5262B) are RoHS non-compliant. Compliance requirements must be verified for your application before selection.

Q: What is the operating temperature range for all substitute parts?

A: All recommended substitute parts maintain the -65°C to 175°C operating temperature range specified for the ZMM5262B-7. No thermal performance degradation occurs with any recommended substitution.

Q: Is inventory availability a factor in part selection?

A: Yes. TZM5262B-GS08 offers the highest inventory (13,386 pcs), followed by TLZ51-GS08 (272,700 pcs). TZM5262B-GS18 has limited availability (700 pcs). Procurement lead times and supply chain considerations should influence final selection.

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