ZMM5266B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5266B-7 is a 68 V, 500 mW Zener diode 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 provide functional equivalence with potential package or tolerance variations.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	68 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	230 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 52 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ZMM5266B-7 is determined by the following critical parameters:

Electrical Specifications:

Zener voltage: 68 V nominal
Tolerance: ±5% (primary specification)
Power dissipation: 500 mW
Impedance: 230 Ohms maximum
Reverse leakage current: 100 nA @ 52 V
Forward voltage: 1.5 V @ 200 mA

Physical and Environmental Requirements:

Surface Mount technology
Operating temperature range: -65°C to 175°C
Moisture Sensitivity Level: 1 (Unlimited)

Compliance and Regulatory:

RoHS3 Compliance status
REACH status
ECCN and HTSUS classifications

Substitute parts are grouped into three categories: (1) Direct Manufacturer Equivalents with identical electrical and package specifications, (2) Manufacturer Recommended alternatives with package variations, and (3) Parametric Equivalents with matching electrical performance in alternative packages.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 200mA (V)	Package	Product Status	RoHS Status
ZMM5266B-7	Diodes Incorporated	68	±5%	500	230	1.5	DO-213AC, MINI-MELF, SOD-80	Obsolete	ROHS3 Compliant
CDLL5266B	Microchip Technology	68	±5%	—	230	1.1	DO-213AB, MELF	Active	RoHS non-compliant
1N5266BUR-1	Microchip Technology	68	±5%	500	230	1.1	DO-213AA	Active	RoHS non-compliant
CDLL5266	Microchip Technology	68	±20%	—	230	1.1	DO-213AB, MELF	Active	RoHS non-compliant
CDLL5266A	Microchip Technology	68	±10%	—	230	1.1	DO-213AB, MELF	Active	RoHS non-compliant
TZMC68-M-08	Vishay General Semiconductor - Diodes Division	68	±5%	500	200	1.5	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
TZMC68-M-18	Vishay General Semiconductor - Diodes Division	68	±5%	500	200	1.5	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
TZM5266B-GS08	Vishay General Semiconductor - Diodes Division	68	±5%	500	230	1.1	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
TZM5266B-GS18	Vishay General Semiconductor - Diodes Division	68	±5%	500	230	1.1	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TZMC68-M-08 and TZMC68-M-18

The TZMC68-M-08 and TZMC68-M-18 from Vishay General Semiconductor - Diodes Division provide the closest functional equivalence to the ZMM5266B-7. Both parts maintain identical electrical specifications (68 V, ±5% tolerance, 500 mW power rating), identical package format (DO-213AC, MINI-MELF, SOD-80), and ROHS3 compliance status. These parts are qualified to AEC-Q101 automotive standards and carry Active product status. The impedance specification of 200 Ohms is within acceptable tolerance relative to the original 230 Ohms specification.

Secondary Recommendation: TZM5266B-GS08 and TZM5266B-GS18

The TZM5266B-GS08 and TZM5266B-GS18 from Vishay provide parametric equivalence with identical electrical performance (68 V, ±5% tolerance, 500 mW, 230 Ohms impedance) and identical package format. These parts maintain ROHS3 compliance and Active product status. Inventory availability is significantly higher for TZM5266B-GS08 (22,800 pieces).

Alternative Consideration: 1N5266BUR-1

The 1N5266BUR-1 from Microchip Technology maintains electrical equivalence (68 V, ±5% tolerance, 500 mW, 230 Ohms impedance) but uses the DO-213AA package variant. This part is Active and available but does not maintain ROHS3 compliance. Selection of this part requires verification of RoHS compliance requirements for the end application.

Not Recommended for Direct Substitution: CDLL5266, CDLL5266A, CDLL5266B

The Microchip CDLL series parts do not maintain ROHS3 compliance status and exhibit tolerance variations (±20% and ±10%) that deviate from the original ±5% specification. CDLL5266B lacks specified power rating information. These parts are suitable only when RoHS compliance is not required and tolerance relaxation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can TZMC68-M-08 and TZMC68-M-18 be used interchangeably with ZMM5266B-7?

A: Yes. Both Vishay parts maintain identical zener voltage (68 V), tolerance (±5%), power rating (500 mW), and package format (DO-213AC, MINI-MELF, SOD-80). The impedance specification of 200 Ohms is within acceptable tolerance relative to the original 230 Ohms. Both parts are ROHS3 compliant and carry Active product status.

Q: What is the difference between TZMC68-M-08 and TZMC68-M-18?

A: Both parts are electrically and mechanically identical. The suffix designates packaging configuration within Tape & Reel format. Selection between these parts is determined by procurement and assembly requirements rather than electrical performance.

Q: Why do TZM5266B-GS08 and TZM5266B-GS18 show different inventory levels?

A: Inventory levels reflect current stock availability and do not indicate electrical or functional differences. Both parts are parametrically identical with 68 V zener voltage, ±5% tolerance, 500 mW power rating, and 230 Ohms impedance. Selection should be based on procurement lead time and availability requirements.

Q: Can CDLL5266 series parts replace ZMM5266B-7?

A: CDLL5266 series parts are not recommended as direct replacements. These Microchip parts do not maintain ROHS3 compliance and exhibit tolerance variations (±20% for CDLL5266, ±10% for CDLL5266A) that deviate from the original ±5% specification. Use of these parts requires explicit verification that tolerance relaxation and RoHS non-compliance are acceptable for the application.

Q: What is the significance of the DO-213AA package used by 1N5266BUR-1?

A: The DO-213AA package is a variant of the MELF family and is mechanically compatible with surface mount assembly processes. However, 1N5266BUR-1 does not maintain ROHS3 compliance. Selection of this part requires confirmation that RoHS compliance requirements are not applicable to the end application.

Q: Are all substitute parts rated for the same operating temperature range?

A: Yes. All substitute parts listed maintain the operating temperature range of -65°C to 175°C, matching the original ZMM5266B-7 specification.

Q: What does AEC-Q101 qualification indicate for TZMC68-M-08 and TZMC68-M-18?

A: AEC-Q101 qualification indicates that these parts meet automotive industry reliability and quality standards established by the Automotive Electronics Council. This qualification is relevant for applications requiring automotive-grade component certification.

Q: Can forward voltage differences affect circuit performance?

A: Forward voltage specifications (1.5 V for ZMM5266B-7 and TZMC68-M series versus 1.1 V for TZM5266B and CDLL series) apply to forward bias operation. For zener diode applications operating in reverse bias (the primary operating mode), forward voltage specification is not a determining factor in substitution compatibility.

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