ZMM5237B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5237B-7 is an 8.2 V Zener diode rated at 500 mW with ±5% tolerance, manufactured by Vishay General Semiconductor - Diodes Division in DO-213AA surface mount package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical performance across voltage regulation, power dissipation, and thermal operating ranges while meeting equivalent mechanical and packaging specifications.

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 Range	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AA (Glass)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the ZMM5237B-7 is determined by strict equivalence across the following parameters:

Primary Electrical Criteria:

Zener voltage: 8.2 V nominal
Maximum power dissipation: 500 mW
Maximum impedance: 8 Ohms
Operating temperature range: -65°C to 175°C
Package type: DO-213AA surface mount

Secondary Criteria:

Tolerance grade (±5%, ±2%, ±1%)
Reverse leakage current specification
Forward voltage characteristics
Military qualification status (MIL-PRF-19500/127)

All substitute parts listed are manufactured by Microchip Technology and maintain the core electrical specifications of the ZMM5237B-7. Substitute parts are grouped by tolerance grade, with tighter tolerances (±1%, ±2%) representing enhanced precision variants. Military-grade designations (JAN, JANTX, JANTXV) indicate qualification to military standards and enhanced screening procedures.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ 200mA	Ir @ Vr	Temp Range	Grade	Status
ZMM5237B-7	Vishay	8.2 V	±5%	500 mW	8 Ω	1.5 V	3 µA @ 6.5V	-65 to 175°C	Commercial	Obsolete
JAN1N756AUR-1/TR	Microchip	8.2 V	±5%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JAN1N756CUR-1/TR	Microchip	8.2 V	±2%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JAN1N756DUR-1/TR	Microchip	8.2 V	±1%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JANTX1N756CUR-1/TR	Microchip	8.2 V	±2%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JANTX1N756DUR-1/TR	Microchip	8.2 V	±1%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JANTXV1N756AUR-1/TR	Microchip	8.2 V	±5%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JANTXV1N756CUR-1/TR	Microchip	8.2 V	±2%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active
JANTXV1N756DUR-1/TR	Microchip	8.2 V	±1%	500 mW	8 Ω	1.1 V	1 µA @ 6V	-65 to 175°C	Military	Active

Engineering Selection Recommendations

Direct Replacement (Equivalent Tolerance):

JAN1N756AUR-1/TR and JANTXV1N756AUR-1/TR are direct electrical equivalents to ZMM5237B-7, maintaining ±5% tolerance specification. Both parts are active, manufactured by Microchip Technology, and qualified to MIL-PRF-19500/127 military standards. These parts feature improved reverse leakage characteristics (1 µA versus 3 µA) and lower forward voltage (1.1 V versus 1.5 V), representing enhanced performance within the same tolerance band.

Enhanced Precision Alternatives:

JAN1N756CUR-1/TR, JAN1N756DUR-1/TR, JANTX1N756CUR-1/TR, JANTX1N756DUR-1/TR, JANTXV1N756CUR-1/TR, and JANTXV1N756DUR-1/TR offer tighter tolerance specifications (±2% and ±1%) while maintaining all other electrical parameters. These variants are suitable for applications requiring improved voltage regulation accuracy.

Military Grade Qualification:

All Microchip substitute parts carry military qualification designations (JAN, JANTX, JANTXV) and MIL-PRF-19500/127 compliance. The JANTXV prefix indicates the highest screening level. Selection between JAN, JANTX, and JANTXV grades depends on application reliability requirements and procurement specifications.

Packaging and Compliance:

All substitute parts are supplied in Tape & Reel (TR) packaging, DO-213AA surface mount configuration, and maintain ROHS3 compliance equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can JAN1N756DUR-1/TR replace ZMM5237B-7 in a circuit designed for ±5% tolerance?

A: Yes. JAN1N756DUR-1/TR maintains the 8.2 V nominal zener voltage and 500 mW power rating. The ±1% tolerance is tighter than the original ±5% specification, making it electrically compatible. The improved reverse leakage (1 µA versus 3 µA) and lower forward voltage (1.1 V versus 1.5 V) represent performance enhancements.

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

A: These designations indicate military screening and qualification levels per MIL-PRF-19500/127. JAN represents standard military qualification, JANTX includes extended temperature screening, and JANTXV includes the highest level of screening and burn-in procedures. All three are functionally equivalent for the specified electrical parameters.

Q: Are all substitute parts available in the same DO-213AA package?

A: Yes. All substitute parts listed are packaged in DO-213AA (Glass) surface mount configuration, identical to the original ZMM5237B-7. All are supplied in Tape & Reel format for automated assembly.

Q: Why does the ZMM5237B-7 show higher reverse leakage current than the substitutes?

A: The ZMM5237B-7 specifies 3 µA reverse leakage at 6.5 V, while Microchip substitutes specify 1 µA at 6 V. This difference reflects manufacturing process improvements and tighter quality control in the Microchip parts. Lower reverse leakage represents improved performance and does not affect compatibility.

Q: Can I use JANTXV1N756AUR-1/TR in place of JAN1N756AUR-1/TR?

A: Yes. Both parts are electrically identical with matching 8.2 V nominal voltage, ±5% tolerance, and 500 mW power rating. JANTXV1N756AUR-1/TR includes enhanced military screening procedures, making it suitable for higher reliability applications while maintaining full backward compatibility.

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

A: Tolerance grade specifies the allowable deviation of the zener voltage from the 8.2 V nominal value. ±5% allows 7.79 V to 8.61 V, ±2% allows 8.04 V to 8.36 V, and ±1% allows 8.12 V to 8.28 V. Tighter tolerances provide more precise voltage regulation for applications requiring strict output voltage control.

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