MMSZ5232B Equivalent & Substitute Parts

Part Overview

The MMSZ5232B is a 5.6 V Zener diode rated for 500 mW power dissipation in a surface mount SOD-123 package, manufactured by onsemi. This component is classified as obsolete, indicating that direct procurement from original inventory may be limited. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring 5.6 V Zener regulation in compact surface mount form factors.

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) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123

Substitute Part Grouping Explanation

Substitution of the MMSZ5232B is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage (Nom): 5.6 V
Power rating: 500 mW
Tolerance: ±5%
Operating temperature range: -55°C to 150°C
Forward voltage: 900 mV @ 10 mA

Mechanical Compatibility Criteria:

Package type: SOD-123 surface mount
Mounting type: Surface mount

Substitute parts are classified into two categories:

Direct Substitutes: Parts that match all electrical parameters and impedance specifications of the MMSZ5232B (11 Ohms maximum impedance). These parts are pin-compatible and functionally equivalent for standard applications.

Similar Substitutes: Parts that match core electrical parameters (voltage, power, tolerance, temperature range) but differ in impedance characteristics or reverse leakage specifications. These parts are functionally compatible but may exhibit different dynamic impedance behavior in high-frequency or precision regulation applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (mV)	Temp Range (°C)	Package	Status	RoHS
MMSZ5232B	onsemi	5.6	±5%	500	11	5 @ 3 V	900 @ 10 mA	-55 to 150	SOD-123	Obsolete	N/A
MMSZ4690T1G	onsemi	5.6	±5%	500	—	10 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ5232BT1G	onsemi	5.6	±5%	500	11	5 @ 3 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ5V6T1G	onsemi	5.6	±5%	500	40	1 @ 2 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ4690ET3G	onsemi	5.6	±5%	500	—	10 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ4690T1G	onsemi	5.6	±5%	500	—	10 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ5V6T1G	onsemi	5.6	±5%	500	40	1 @ 2 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ4690T3G	onsemi	5.6	±5%	500	—	10 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ5V6T3G	onsemi	5.6	±5%	500	40	1 @ 2 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ4690ET1G	onsemi	5.6	—	500	—	10 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ4690T3G	onsemi	5.6	±5%	500	—	10 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: MMSZ5232BT1G

The MMSZ5232BT1G is the direct functional equivalent of the MMSZ5232B. It maintains identical electrical specifications including 11 Ohms maximum impedance, 5 µA reverse leakage at 3 V, and all other parameters. The part is in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. This part is suitable for direct replacement in all applications where the MMSZ5232B was originally specified.

Secondary Recommendation: MMSZ5V6T1G or MMSZ5V6T3G

These parts meet all core electrical requirements (5.6 V, 500 mW, ±5% tolerance, -55°C to 150°C) and are in active production with ROHS3 compliance. The primary difference is higher impedance (40 Ohms maximum) and lower reverse leakage (1 µA at 2 V). These characteristics result in tighter voltage regulation and lower standby current. Selection of these parts is appropriate for applications where improved regulation stability is beneficial or where lower leakage current is required.

Automotive-Grade Options: SZMMSZ4690T1G, SZMMSZ5V6T1G, SZMMSZ4690T3G, SZMMSZ4690ET3G

Parts with the SZ prefix designation are automotive-grade components qualified to AEC-Q101 standard. These parts are suitable for automotive and high-reliability applications. SZMMSZ4690T1G and SZMMSZ4690T3G provide standard impedance characteristics with 10 µA reverse leakage. SZMMSZ5V6T1G offers lower leakage (1 µA) with higher impedance (40 Ohms). All automotive-grade options are in active production with ROHS3 compliance.

Alternative: MMSZ4690T1G or MMSZ4690T3G

These parts match the core electrical specifications but exhibit 10 µA reverse leakage at 4 V compared to the MMSZ5232B specification of 5 µA at 3 V. These parts are in active production with ROHS3 compliance and represent a cost-effective alternative where the higher leakage specification is acceptable to the application design.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5232BT1G be used as a direct replacement for MMSZ5232B?

A: Yes. The MMSZ5232BT1G is electrically and mechanically identical to the MMSZ5232B. Both parts specify 5.6 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, 11 Ohms maximum impedance, 5 µA reverse leakage at 3 V, and SOD-123 surface mount packaging. The primary difference is product status: MMSZ5232BT1G is in active production while MMSZ5232B is obsolete.

Q: What is the difference between MMSZ5V6T1G and MMSZ5232BT1G?

A: Both parts share identical nominal Zener voltage (5.6 V), tolerance (±5%), power rating (500 mW), forward voltage (900 mV @ 10 mA), and operating temperature range (-55°C to 150°C). The differences are: MMSZ5V6T1G has 40 Ohms maximum impedance and 1 µA reverse leakage at 2 V, while MMSZ5232BT1G has 11 Ohms maximum impedance and 5 µA reverse leakage at 3 V. The MMSZ5V6T1G provides lower leakage current and higher impedance, resulting in tighter voltage regulation.

Q: Are automotive-grade parts (SZ prefix) compatible with standard applications?

A: Yes. Automotive-grade parts such as SZMMSZ4690T1G and SZMMSZ5V6T1G meet or exceed the electrical specifications of standard-grade parts. These components are qualified to AEC-Q101 automotive standard and are suitable for any application where the standard-grade equivalent is specified. Automotive-grade parts provide additional qualification and reliability assurance.

Q: What does the packaging designation (CT & Digi-Reel® vs. Tape & Reel) mean?

A: Cut Tape (CT) & Digi-Reel® packaging indicates the component is supplied on cut tape or in Digi-Reel format, suitable for manual or semi-automated assembly. Tape & Reel (TR) packaging indicates the component is supplied on continuous tape in reel format, optimized for automated pick-and-place assembly. Both packaging formats contain identical components; the difference is in supply format and handling method.

Q: Why do some substitute parts not specify impedance (Zzt)?

A: Impedance specification is not provided for all part variants in the available data. Parts without specified impedance values (such as MMSZ4690T1G) are functionally compatible with the MMSZ5232B for standard voltage regulation applications. If impedance specification is critical to the application design, select parts with explicitly stated impedance values: MMSZ5232BT1G (11 Ohms), MMSZ5V6T1G (40 Ohms), or MMSZ5V6T3G (40 Ohms).

Q: Is ROHS3 compliance required for my application?

A: All active substitute parts listed are ROHS3 compliant. The original MMSZ5232B does not specify RoHS status because it is classified as obsolete. If your application or supply chain requires RoHS compliance, select from the active production parts, all of which carry ROHS3 certification.

Q: Can I use MMSZ4690T1G instead of MMSZ5232BT1G?

A: Yes, with the following consideration: MMSZ4690T1G specifies 10 µA reverse leakage at 4 V, compared to MMSZ5232BT1G at 5 µA at 3 V. Both parts meet the 5.6 V, 500 mW, ±5% tolerance, and SOD-123 package requirements. The higher reverse leakage of MMSZ4690T1G is acceptable in applications where standby current and leakage specifications are not critical design constraints.

Q: What is the difference between T1G and T3G suffix designations?

A: The T1G and T3G suffixes indicate different manufacturing or packaging variants within the same electrical specification. Both MMSZ5V6T1G and MMSZ5V6T3G are electrically identical with 5.6 V, 500 mW, 40 Ohms impedance, and 1 µA reverse leakage. Selection between these variants is based on packaging format availability and supply chain requirements rather than electrical performance.

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