ZMM5231B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5231B-7 is a Zener diode rated at 5.1 V nominal with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division in DO-213AA surface mount package. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and field replacement applications. Substitute parts listed below maintain electrical and mechanical compatibility while offering active product status and enhanced qualification grades.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.1	V
Power - Max	500	mW
Tolerance	±5%	—
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 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	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ZMM5231B-7 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Voltage - Zener (Nom): 5.1 V
Power - Max: 500 mW
Impedance (Max): 17 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 2 V
Operating Temperature Range: -65°C to 175°C

Mechanical Parameters (Must Match):

Mounting Type: Surface Mount
Package / Case: DO-213AA

Tolerance Variations (Allowed): Substitute parts are grouped by tolerance specification. The main part specifies ±5% tolerance. Substitute parts with tighter tolerances (±2% and ±1%) are electrically compatible and represent enhanced specifications. All substitute parts maintain the same nominal voltage and power rating.

Voltage - Forward (Vf) Consideration: The main part specifies Vf (Max) of 1.5 V @ 200 mA. Substitute parts specify 1.1 V @ 200 mA, representing improved forward voltage characteristics and are functionally compatible.

Military Grade Qualification: All substitute parts carry military qualification (MIL-PRF-19500/127) and are available in active product status, providing enhanced reliability and traceability compared to the obsolete main part.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status	Grade
ZMM5231B-7	Vishay	5.1 V	±5%	500 mW	17 Ω	1.5 V @ 200 mA	-65 to 175°C	DO-213AA	Obsolete	Commercial
JAN1N751AUR-1/TR	Microchip	5.1 V	±5%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military
JAN1N751CUR-1/TR	Microchip	5.1 V	±2%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military
JAN1N751DUR-1/TR	Microchip	5.1 V	±1%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military
JANTX1N751CUR-1/TR	Microchip	5.1 V	±2%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military
JANTXV1N751AUR-1/TR	Microchip	5.1 V	±5%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military
JANTXV1N751CUR-1/TR	Microchip	5.1 V	±2%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military
JANTXV1N751DUR-1/TR	Microchip	5.1 V	±1%	500 mW	17 Ω	1.1 V @ 200 mA	-65 to 175°C	DO-213AA	Active	Military

Engineering Selection Recommendations

For Direct Replacement (Matching Tolerance ±5%): JAN1N751AUR-1/TR and JANTXV1N751AUR-1/TR are direct electrical equivalents to ZMM5231B-7, maintaining the same ±5% tolerance specification. Both are manufactured by Microchip Technology and carry military qualification under MIL-PRF-19500/127. These parts are in active product status and available in tape and reel packaging.

For Enhanced Tolerance Requirements (±2%): JAN1N751CUR-1/TR, JANTX1N751CUR-1/TR, JANTXV1N751CUR-1/TR provide tighter tolerance control at ±2%. These parts are suitable for applications requiring improved voltage regulation accuracy while maintaining all other electrical and mechanical specifications.

For Highest Tolerance Specification (±1%): JAN1N751DUR-1/TR and JANTXV1N751DUR-1/TR offer the tightest tolerance at ±1%. These parts are appropriate for precision voltage reference applications and demanding regulatory environments.

Compliance and Qualification: All substitute parts are ROHS3 compliant and REACH unaffected. Military-grade qualification (MIL-PRF-19500/127) across all substitute parts ensures traceability and reliability suitable for aerospace, defense, and critical infrastructure applications. The transition from obsolete Vishay part to active Microchip equivalents ensures long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can JAN1N751CUR-1/TR replace ZMM5231B-7 directly in my circuit?

A: Yes. JAN1N751CUR-1/TR is electrically equivalent to ZMM5231B-7 across all critical parameters: 5.1 V nominal voltage, 500 mW power rating, 17 Ohms maximum impedance, and DO-213AA surface mount package. The ±2% tolerance is tighter than the original ±5%, providing improved voltage regulation. Both parts operate across the same temperature range (-65°C to 175°C).

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

A: These prefixes indicate military qualification grades. JAN denotes standard military grade. JANTX indicates extended temperature range military grade. JANTXV indicates extended temperature range with additional screening. All three grades are qualified under MIL-PRF-19500/127 and are functionally compatible for the ZMM5231B-7 application.

Q: Why do substitute parts show lower forward voltage (1.1 V vs. 1.5 V)?

A: The forward voltage specification represents the maximum value at 200 mA forward current. Lower forward voltage in substitute parts indicates improved device characteristics and does not affect substitution compatibility. The circuit will experience lower power dissipation in the forward direction, which is beneficial.

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. All substitute parts listed are supplied in tape and reel (TR) packaging, suitable for automated assembly processes. The DO-213AA package format is consistent across all parts.

Q: What is the inventory status of substitute parts?

A: Substitute parts are in active production with current inventory: JAN1N751AUR-1/TR (825 pcs), JAN1N751CUR-1/TR (1043 pcs), JAN1N751DUR-1/TR (893 pcs), JANTX1N751CUR-1/TR (1024 pcs), JANTXV1N751AUR-1/TR (715 pcs), JANTXV1N751CUR-1/TR (921 pcs), JANTXV1N751DUR-1/TR (776 pcs).

Q: Is RoHS compliance maintained across all substitute parts?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, maintaining environmental compliance requirements.

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