ZMM5239B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5239B-7 is a Zener diode rated at 9.1 V, 500 mW, manufactured by Vishay General Semiconductor - Diodes Division in DO-213AA surface mount package. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 9.1 V Zener regulation in surface mount form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 7 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

Substitute parts for the ZMM5239B-7 are qualified based on the following critical parameters:

Electrical Parameters (Must Match):

Voltage - Zener (Nom): 9.1 V
Power - Max: 500 mW
Impedance (Max): 10 Ohms
Operating Temperature Range: -65°C to 175°C
Package / Case: DO-213AA (Glass)
Mounting Type: Surface Mount

Tolerance Variations (Allowed): Substitute parts are available with tolerance ratings of ±5%, ±2%, and ±1%, providing options for applications with different precision requirements.

Military Grade Options: All substitute parts listed are manufactured by Microchip Technology and carry military qualification (MIL-PRF-19500/127) with JAN, JANTX, or JANTXV grade designations, representing enhanced screening and reliability levels compared to the obsolete commercial-grade main part.

Reverse Leakage Improvement: Substitute parts demonstrate improved reverse leakage characteristics (1 µA @ 7 V) compared to the main part (3 µA @ 7 V), and reduced forward voltage drop (1.1 V @ 200 mA vs. 1.5 V @ 200 mA).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Grade	Status
ZMM5239B-7	Vishay	9.1 V	±5%	500 mW	10 Ω	3 µA @ 7 V	1.5 V @ 200 mA	-65 to 175°C	Commercial	Obsolete
JAN1N757AUR-1/TR	Microchip	9.1 V	±5%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JAN	Active
JAN1N757CUR-1/TR	Microchip	9.1 V	±2%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JAN	Active
JAN1N757DUR-1/TR	Microchip	9.1 V	±1%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JAN	Active
JANTX1N757CUR-1/TR	Microchip	9.1 V	±2%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JANTX	Active
JANTX1N757DUR-1/TR	Microchip	9.1 V	±1%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JANTX	Active
JANTXV1N757AUR-1/TR	Microchip	9.1 V	±5%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JANTXV	Active
JANTXV1N757CUR-1/TR	Microchip	9.1 V	±2%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JANTXV	Active
JANTXV1N757DUR-1/TR	Microchip	9.1 V	±1%	500 mW	10 Ω	1 µA @ 7 V	1.1 V @ 200 mA	-65 to 175°C	Military JANTXV	Active

Engineering Selection Recommendations

For Direct Replacement (Equivalent Tolerance): JAN1N757AUR-1/TR and JANTXV1N757AUR-1/TR maintain the ±5% tolerance specification of the original ZMM5239B-7. Both parts are active products with military qualification and improved electrical characteristics. JANTXV1N757AUR-1/TR provides the highest screening level (JANTXV grade).

For Enhanced Precision Applications: JAN1N757CUR-1/TR, JANTX1N757CUR-1/TR, and JANTXV1N757CUR-1/TR offer ±2% tolerance. JAN1N757DUR-1/TR, JANTX1N757DUR-1/TR, and JANTXV1N757DUR-1/TR provide ±1% tolerance for applications requiring tighter voltage regulation accuracy.

For Military and Aerospace Applications: JANTXV-grade parts (JANTXV1N757AUR-1/TR, JANTXV1N757CUR-1/TR, JANTXV1N757DUR-1/TR) meet MIL-PRF-19500/127 qualification with the highest screening requirements. JANTX-grade parts (JANTX1N757CUR-1/TR, JANTX1N757DUR-1/TR) provide intermediate screening levels.

For Standard Commercial Applications: JAN-grade parts (JAN1N757AUR-1/TR, JAN1N757CUR-1/TR, JAN1N757DUR-1/TR) provide military qualification with standard screening, suitable for applications requiring reliability assurance without extreme environmental demands.

Compliance Considerations: All substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original part. All parts are supplied in Tape & Reel (TR) packaging format.

Frequently Asked Questions (FAQ)

Q: Can JAN1N757AUR-1/TR directly replace ZMM5239B-7 without circuit modification?

A: Yes. JAN1N757AUR-1/TR maintains identical electrical specifications: 9.1 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, 10 Ohms maximum impedance, and -65°C to 175°C operating temperature range. Both use DO-213AA surface mount package. The substitute part demonstrates improved reverse leakage (1 µA vs. 3 µA) and lower forward voltage drop (1.1 V vs. 1.5 V), which are beneficial characteristics.

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

A: These designations indicate military screening levels per MIL-PRF-19500/127. JAN represents standard military screening. JANTX includes additional temperature cycling and burn-in testing. JANTXV includes the most comprehensive screening with extended temperature and vibration testing. All three grades are functionally equivalent for the specified electrical parameters.

Q: Why do substitute parts show lower reverse leakage current (1 µA vs. 3 µA)?

A: The substitute parts from Microchip Technology represent current manufacturing technology with improved device characteristics. Lower reverse leakage indicates better diode quality and reduced parasitic current, which benefits circuit performance and power efficiency.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in DO-213AA surface mount package in Tape & Reel (TR) format, matching the original part's packaging specification for automated assembly compatibility.

Q: Which substitute part should be selected for applications requiring the tightest voltage tolerance?

A: JAN1N757DUR-1/TR, JANTX1N757DUR-1/TR, or JANTXV1N757DUR-1/TR provide ±1% tolerance, the tightest specification available. Selection between these three depends on required military screening level: standard (JAN), intermediate (JANTX), or comprehensive (JANTXV).

Q: Is the ZMM5239B-7 still available for new designs?

A: No. The ZMM5239B-7 is classified as obsolete. Active substitute parts from Microchip Technology are recommended for all new designs and ongoing production requirements.

Q: Do substitute parts meet the same environmental compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original ZMM5239B-7.

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