ZMM5232B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5232B-7 is a Zener diode rated at 5.6 V nominal with 500 mW power dissipation, manufactured by Diodes Incorporated in Mini MELF surface mount packaging. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -65°C to 175°C with ±5% voltage tolerance and is ROHS3 compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
Voltage - Forward (Vf) (Max)	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-

Substitute Part Grouping Explanation

Substitution of the ZMM5232B-7 is determined by the following critical parameters: nominal Zener voltage (5.6 V), power rating (500 mW), voltage tolerance (±5%), impedance (11 Ohms maximum), reverse leakage current (5 µA @ 3 V), and operating temperature range (-65°C to 175°C). Surface mount mounting type is required. Substitute parts are grouped into two categories:

Manufacturer Recommended Substitutes: Parts meeting all or substantially equivalent electrical specifications with active product status, including MMSZ5232B-7-F (SOD-123 package), 1N5232BUR-1 (DO-213AA package), CDLL5232B (DO-213AB package with ±5% tolerance), CDLL5232A (DO-213AB package with ±10% tolerance), CDLL5232 (DO-213AB package with ±20% tolerance), and TZMC5V6-M-18 (SOD-80 MiniMELF with automotive qualification).

Parametric Equivalent: DL5232B-TP (Mini MELF package, obsolete status) provides identical electrical and mechanical specifications to the main part.

Parameter Comparison

Parameter	ZMM5232B-7	MMSZ5232B-7-F	1N5232BUR-1	CDLL5232B	CDLL5232A	CDLL5232	TZMC5V6-M-18	DL5232B-TP
Manufacturer	Diodes Inc.	Diodes Inc.	Microchip	Microchip	Microchip	Microchip	Vishay	Micro Commercial Co
Voltage - Zener (Nom)	5.6 V	5.6 V	5.6 V	5.6 V	5.6 V	5.6 V	5.6 V	5.6 V
Tolerance	±5%	±5%	±5%	±5%	±10%	±20%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	-	-	-	500 mW	500 mW
Impedance (Max)	11 Ω	11 Ω	11 Ω	11 Ω	11 Ω	11 Ω	40 Ω	11 Ω
Current - Reverse Leakage @ Vr	5 µA @ 3 V	5 µA @ 3 V	5 µA @ 3 V	5 µA @ 3 V	5 µA @ 3 V	5 µA @ 3 V	100 nA @ 1 V	5 µA @ 3 V
Voltage - Forward (Vf) (Max)	1.5 V @ 200 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 150°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-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Non-compliant	Non-compliant	Non-compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Compatibility (Mini MELF / SOD-80): The TZMC5V6-M-18 from Vishay provides identical package form factor with active product status and ROHS3 compliance. This part includes automotive qualification (AEC-Q101) and demonstrates superior reverse leakage characteristics (100 nA @ 1 V versus 5 µA @ 3 V). The impedance specification differs at 40 Ohms maximum versus 11 Ohms, and the maximum operating temperature is identical at 175°C. The DL5232B-TP from Micro Commercial Co provides parametric equivalence with identical electrical and mechanical specifications but carries obsolete status.

For Active Product Status with ROHS3 Compliance: The MMSZ5232B-7-F from Diodes Incorporated offers active product status and ROHS3 compliance in SOD-123 packaging. This substitution requires PCB layout modification due to package change. The maximum operating temperature is reduced to 150°C. Forward voltage specification differs due to different measurement conditions (900 mV @ 10 mA versus 1.5 V @ 200 mA).

For Microchip Technology Options: The CDLL5232B provides ±5% tolerance matching with active status in DO-213AB MELF packaging. CDLL5232A offers ±10% tolerance, and CDLL5232 offers ±20% tolerance. All Microchip options carry non-compliant RoHS status. The 1N5232BUR-1 from Microchip provides active status in DO-213AA packaging with non-compliant RoHS status and full temperature range support (-65°C to 175°C).

Compliance Considerations: ROHS3-compliant designs should prioritize MMSZ5232B-7-F or TZMC5V6-M-18. Applications without RoHS constraints may utilize Microchip CDLL series or 1N5232BUR-1 options.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5232B-7-F replace ZMM5232B-7 directly on the PCB?

A: No. MMSZ5232B-7-F uses SOD-123 packaging while ZMM5232B-7 uses Mini MELF (SOD-80). PCB layout and footprint modifications are required. Electrical specifications are equivalent at 5.6 V nominal, 500 mW, and ±5% tolerance. Maximum operating temperature is reduced from 175°C to 150°C with MMSZ5232B-7-F.

Q: What is the difference between CDLL5232, CDLL5232A, and CDLL5232B?

A: These parts differ only in voltage tolerance: CDLL5232 specifies ±20%, CDLL5232A specifies ±10%, and CDLL5232B specifies ±5%. All three share identical 5.6 V nominal voltage, DO-213AB MELF packaging, and operating temperature range (-65°C to 175°C). Selection depends on tolerance requirements for the application.

Q: Is TZMC5V6-M-18 suitable for automotive applications?

A: Yes. TZMC5V6-M-18 carries AEC-Q101 automotive qualification and is rated for automotive-grade applications. It maintains Mini MELF packaging identical to ZMM5232B-7 and provides superior reverse leakage performance (100 nA @ 1 V). Impedance specification is 40 Ohms maximum versus 11 Ohms for the original part.

Q: Why is DL5232B-TP listed if it is obsolete?

A: DL5232B-TP is included as a parametric equivalent providing identical electrical and mechanical specifications to ZMM5232B-7. Both parts are obsolete. This listing documents the equivalence for reference purposes; active product substitutes are recommended for new designs.

Q: What are the RoHS compliance implications for substitute selection?

A: ZMM5232B-7 and TZMC5V6-M-18 are ROHS3 compliant. MMSZ5232B-7-F is ROHS3 compliant. All Microchip options (1N5232BUR-1, CDLL5232, CDLL5232A, CDLL5232B) are RoHS non-compliant. Applications subject to RoHS requirements must use ROHS3-compliant substitutes.

Q: Can 1N5232BUR-1 be used as a drop-in replacement?

A: 1N5232BUR-1 uses DO-213AA packaging, requiring PCB footprint modification from Mini MELF. Electrical specifications match at 5.6 V nominal, 500 mW, and ±5% tolerance. Operating temperature range is identical (-65°C to 175°C). Forward voltage differs at 1.1 V @ 200 mA versus 1.5 V @ 200 mA. RoHS non-compliant status must be evaluated against design requirements.

Q: What is the significance of impedance differences between substitute parts?

A: Impedance (Zzt) affects dynamic resistance and voltage regulation characteristics. ZMM5232B-7, MMSZ5232B-7-F, and Microchip options specify 11 Ohms maximum. TZMC5V6-M-18 specifies 40 Ohms maximum. Higher impedance may affect circuit performance in applications requiring tight voltage regulation. Circuit simulation or testing is necessary to confirm suitability in specific applications.

Q: Are there inventory considerations for substitute selection?

A: ZMM5232B-7 has 30,300 pieces in stock (obsolete status). Active alternatives include MMSZ5232B-7-F (24,991 pieces), TZMC5V6-M-18 (909 pieces), CDLL5232B (981 pieces), CDLL5232A (842 pieces), CDLL5232 (1,018 pieces), and 1N5232BUR-1 (1,043 pieces). Inventory levels should be verified for production volume requirements.

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