ZMM5237B-13 Equivalent & Substitute Parts

Part Overview

The ZMM5237B-13 is a Zener diode rated at 8.2 V nominal with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part is packaged in DO-213AA (Glass) surface mount configuration with ±5% voltage tolerance and operates across the temperature range of -65°C to 175°C. Substitute parts must maintain electrical equivalence in zener voltage, power rating, and mechanical compatibility while meeting current product availability requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	8	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6.5 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AA (Glass)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the ZMM5237B-13 are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Core Electrical Parameters:

Zener voltage (Nom): 8.2 V (fixed requirement)
Power dissipation: 500 mW (fixed requirement)
Impedance (Max): 8 Ohms (fixed requirement)
Operating temperature range: -65°C to 175°C (fixed requirement)
Package type: DO-213AA surface mount (fixed requirement)

Secondary Electrical Parameters:

Voltage tolerance: ±5%, ±2%, or ±1% (tighter tolerances are acceptable substitutes)
Reverse leakage current: 1 µA @ 6 V (substitute specification, lower than main part)
Forward voltage: 1.1 V @ 200 mA (substitute specification, lower than main part)

All substitute parts are manufactured by Microchip Technology and carry military-grade qualification (MIL-PRF-19500/127) with active product status. Substitutes are available in Tape & Reel packaging and maintain ROHS3 compliance.

Parameter Comparison

Parameter	ZMM5237B-13	JAN1N756AUR-1/TR	JAN1N756CUR-1/TR	JAN1N756DUR-1/TR	JANTX1N756CUR-1/TR	JANTX1N756DUR-1/TR	JANTXV1N756AUR-1/TR	JANTXV1N756CUR-1/TR	JANTXV1N756DUR-1/TR
Manufacturer	Vishay	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip	Microchip
Voltage - Zener (Nom)	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V
Tolerance	±5%	±5%	±2%	±1%	±2%	±1%	±5%	±2%	±1%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 6.5 V	1 µA @ 6 V	1 µA @ 6 V	1 µA @ 6 V	1 µA @ 6 V	1 µA @ 6 V	1 µA @ 6 V	1 µA @ 6 V	1 µA @ 6 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Package / Case	DO-213AA	DO-213AA	DO-213AA	DO-213AA	DO-213AA	DO-213AA	DO-213AA	DO-213AA	DO-213AA
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Grade	Commercial	Military	Military	Military	Military	Military	Military	Military	Military
Qualification	—	MIL-PRF-19500/127	MIL-PRF-19500/127	MIL-PRF-19500/127	MIL-PRF-19500/127	MIL-PRF-19500/127	MIL-PRF-19500/127	MIL-PRF-19500/127	MIL-PRF-19500/127
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	684 Pcs	1056 Pcs	656 Pcs	979 Pcs	1021 Pcs	1004 Pcs	667 Pcs	877 Pcs	722 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain full electrical equivalence to the ZMM5237B-13 across the critical parameters of zener voltage, power dissipation, impedance, and operating temperature range. The primary advantage of substitution is product status: all Microchip alternatives carry active product status with military-grade qualification under MIL-PRF-19500/127, compared to the obsolete status of the original Vishay part.

Tolerance-Based Selection:

Parts with ±1% tolerance (JAN1N756DUR-1/TR, JANTX1N756DUR-1/TR, JANTXV1N756DUR-1/TR) provide the tightest voltage regulation and are suitable for applications requiring precise zener voltage control.

Parts with ±2% tolerance (JAN1N756CUR-1/TR, JANTX1N756CUR-1/TR, JANTXV1N756CUR-1/TR) offer a balance between precision and cost.

Parts with ±5% tolerance (JAN1N756AUR-1/TR, JANTXV1N756AUR-1/TR) match the original specification and are suitable for general-purpose voltage regulation applications.

Military Grade Qualification:

All substitute parts carry MIL-PRF-19500/127 qualification, providing enhanced reliability and traceability for applications requiring military or aerospace standards. The original ZMM5237B-13 carries no military qualification.

Electrical Performance Improvements:

Substitute parts exhibit lower reverse leakage current (1 µA @ 6 V versus 3 µA @ 6.5 V) and lower forward voltage drop (1.1 V @ 200 mA versus 1.5 V @ 200 mA), resulting in improved circuit efficiency and reduced power dissipation in forward-biased applications.

Packaging and Compliance:

All parts are supplied in Tape & Reel packaging suitable for automated assembly. ROHS3 compliance is maintained across all options.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ZMM5237B-13 with any of the listed Microchip parts?

A: Yes. All listed substitute parts maintain identical zener voltage (8.2 V), power rating (500 mW), impedance (8 Ohms), operating temperature range (-65°C to 175°C), and package type (DO-213AA). Direct pin-for-pin substitution is electrically and mechanically compatible.

Q: What is the difference between the tolerance grades (±5%, ±2%, ±1%)?

A: Tolerance refers to the allowable deviation of the zener voltage from the nominal 8.2 V specification. ±5% allows ±0.41 V deviation (7.79 V to 8.61 V). ±2% allows ±0.164 V deviation (7.836 V to 8.364 V). ±1% allows ±0.082 V deviation (7.918 V to 8.282 V). Tighter tolerances provide more precise voltage regulation but do not affect functional compatibility.

Q: Why do substitute parts show lower reverse leakage current?

A: The substitute parts are manufactured to military-grade specifications (MIL-PRF-19500/127), which impose stricter quality control and testing requirements than commercial-grade parts. Lower reverse leakage current is a result of enhanced manufacturing processes and does not affect compatibility; it represents an improvement in circuit performance.

Q: Are the substitute parts available in the same packaging as the original?

A: Yes. All substitute parts are packaged in DO-213AA surface mount configuration, identical to the original ZMM5237B-13. Substitute parts are supplied in Tape & Reel format, which is standard for automated assembly operations.

Q: What is the significance of military qualification (MIL-PRF-19500/127)?

A: MIL-PRF-19500/127 qualification indicates that the parts meet military performance and reliability standards, including enhanced testing, traceability, and documentation requirements. This qualification is not present in the original ZMM5237B-13 but is present in all substitute parts, providing additional assurance for applications requiring high reliability.

Q: Can I use a ±1% tolerance part in place of a ±5% tolerance part?

A: Yes. A ±1% tolerance part is a superior substitute for a ±5% tolerance part because it provides tighter voltage regulation. The ±1% part will operate within the ±5% specification window while providing enhanced precision. No circuit redesign is required.

Q: What is the difference between JAN, JANTX, and JANTXV prefixes?

A: These prefixes indicate different military qualification levels and screening requirements. JAN indicates basic military qualification. JANTX indicates enhanced screening and testing. JANTXV indicates the highest level of military qualification with additional environmental and reliability testing. All three are functionally equivalent for the 8.2 V zener diode application and differ only in qualification rigor.

Q: Is there any performance difference in forward voltage drop between the original and substitutes?

A: The substitute parts specify a maximum forward voltage of 1.1 V @ 200 mA, compared to 1.5 V @ 200 mA for the original ZMM5237B-13. This represents an improvement in forward conduction efficiency. In applications where the diode conducts in the forward direction, substitute parts will generate less heat and consume less power. This difference does not affect reverse-biased zener regulation applications.

Q: Which substitute part should I select for new designs?

A: For new designs, any of the active Microchip substitute parts is appropriate. Selection should be based on tolerance requirements: use ±1% parts for precision voltage regulation, ±2% parts for general-purpose applications, or ±5% parts for cost-sensitive applications. All parts carry military qualification and active product status, ensuring long-term availability and support.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message