MMSZ5235BT3 Equivalent & Substitute Parts

Part Overview

The MMSZ5235BT3 is a Zener diode rated at 6.8 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete. Equivalent and substitute parts are necessary to support ongoing production requirements, design updates, and supply chain continuity. Active alternatives with identical or superior electrical characteristics and improved compliance status are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123

Substitute Part Grouping Explanation

Substitution of the MMSZ5235BT3 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 6.8 V
Tolerance: ±5%
Power - Max: 500 mW (or higher)
Impedance (Max): 5 Ohms (or lower)
Current - Reverse Leakage @ Vr: 3 µA @ 5 V (or lower)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (or lower)
Operating Temperature Range: -55°C to 150°C (or wider)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: SOD-123

Compliance Criteria:

RoHS Status: ROHS3 Compliant preferred
Moisture Sensitivity Level: 1 (Unlimited)

Parts are grouped into three categories:

Parametric Equivalents (onsemi): Parts with identical electrical specifications and SOD-123 packaging from the same manufacturer, with active product status and improved compliance.

Parametric Equivalents (Multi-Manufacturer): Parts from alternative manufacturers meeting all electrical and mechanical specifications with active product status.

Upgrade Parts: Parts with extended operating temperature range or automotive qualification that exceed baseline specifications.

Similar Parts: Parts with minor deviations in power rating or impedance that maintain functional compatibility within application tolerances.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (mW)	Zzt (Ohms)	Ir (µA)	Vf (mV)	Temp Range (°C)	Package	Status	RoHS
MMSZ5235BT3	onsemi	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-55 to 150	SOD-123	Obsolete	Non-compliant
MMSZ5235BT1G	onsemi	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ5235BT3G	onsemi	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ5235ET1G	onsemi	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ5235BT1G	onsemi	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ5235ET1G	onsemi	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ5235B-7-F	Diodes Incorporated	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-65 to 150	SOD-123	Active	ROHS3
BZT52H-C6V8,115	NXP Semiconductors	6.8	±5	375	8	2 @ 4V	900 @ 10mA	-65 to 150	SOD-123F	Active	N/A
CMHZ5235B TR PBFREE	Central Semiconductor Corp	6.8	±5	500	5	3 @ 5V	900 @ 10mA	-65 to 150	SOD-123	Active	ROHS3
MMSZ5235B-E3-08	Vishay General Semiconductor	6.8	±5	500	5	3 @ 5V	N/A	-55 to 150	SOD-123	Active	ROHS3
MMSZ5235B-E3-18	Vishay General Semiconductor	6.8	±5	500	5	3 @ 5V	N/A	-55 to 150	SOD-123	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation - onsemi Parametric Equivalents:

MMSZ5235BT1G, MMSZ5235BT3G, and MMSZ5235ET1G are direct parametric equivalents with identical electrical specifications. All three are active products with ROHS3 compliance, addressing the obsolescence of the MMSZ5235BT3. Selection between these three depends on packaging requirements: MMSZ5235BT1G is supplied in Cut Tape & Digi-Reel format, MMSZ5235BT3G in standard packaging, and MMSZ5235ET1G in Tape & Reel format.

Automotive-Grade Alternative:

SZMMSZ5235BT1G and SZMMSZ5235ET1G are automotive-qualified variants (AEC-Q101) with identical electrical performance. These are suitable for applications requiring automotive-grade components and are available in active status with ROHS3 compliance.

Extended Temperature Range Option:

MMSZ5235B-7-F from Diodes Incorporated extends the operating temperature range to -65°C to 150°C while maintaining all other electrical specifications. This part is active and ROHS3 compliant.

Multi-Manufacturer Alternatives:

CMHZ5235B TR PBFREE from Central Semiconductor Corp provides identical electrical specifications with extended temperature range (-65°C to 150°C) and ROHS3 compliance.

MMSZ5235B-E3-08 and MMSZ5235B-E3-18 from Vishay General Semiconductor are parametric equivalents available in different packaging formats (Cut Tape and Tape & Reel respectively).

Lower Power Alternative:

BZT52H-C6V8,115 from NXP Semiconductors has a reduced power rating of 375 mW and slightly higher impedance (8 Ohms). This part is suitable only for applications where the lower power dissipation is acceptable and does not exceed thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5235BT1G directly replace MMSZ5235BT3?

A: Yes. MMSZ5235BT1G is a parametric equivalent with identical electrical specifications (6.8 V, 500 mW, ±5% tolerance, SOD-123 package). The primary difference is product status (active vs. obsolete) and compliance (ROHS3 vs. non-compliant). Packaging format differs: MMSZ5235BT1G is supplied in Cut Tape & Digi-Reel, while MMSZ5235BT3 was supplied in standard packaging.

Q: What is the difference between MMSZ5235BT1G, MMSZ5235BT3G, and MMSZ5235ET1G?

A: All three are parametric equivalents with identical electrical specifications. The differences are in packaging format: MMSZ5235BT1G is Cut Tape & Digi-Reel, MMSZ5235BT3G is standard packaging, and MMSZ5235ET1G is Tape & Reel. Selection depends on assembly line requirements and tape specifications.

Q: Are automotive-qualified versions available?

A: Yes. SZMMSZ5235BT1G and SZMMSZ5235ET1G are AEC-Q101 qualified automotive-grade variants with identical electrical specifications. These are suitable for automotive applications requiring qualification documentation.

Q: Can BZT52H-C6V8,115 be used as a substitute?

A: BZT52H-C6V8,115 has the same 6.8 V zener voltage and forward voltage characteristics but differs in power rating (375 mW vs. 500 mW) and impedance (8 Ohms vs. 5 Ohms). This part is suitable only for applications where the lower power dissipation does not exceed thermal design limits.

Q: What is the difference between Cut Tape & Digi-Reel and Tape & Reel packaging?

A: Cut Tape & Digi-Reel format provides components on tape that can be cut to length for manual or semi-automated assembly. Tape & Reel format provides continuous tape on a reel for fully automated pick-and-place assembly. Selection depends on production equipment and volume requirements.

Q: Are all substitute parts RoHS compliant?

A: All recommended parametric equivalents and alternatives are ROHS3 compliant except BZT52H-C6V8,115, for which RoHS status is not specified. The original MMSZ5235BT3 is RoHS non-compliant.

Q: What is the operating temperature range difference between parts?

A: MMSZ5235BT3, MMSZ5235BT1G, MMSZ5235BT3G, MMSZ5235ET1G, and Vishay variants operate from -55°C to 150°C. MMSZ5235B-7-F, BZT52H-C6V8,115, and CMHZ5235B TR PBFREE extend the lower limit to -65°C. Selection depends on application temperature requirements.

Q: Can parts from different manufacturers be mixed in production?

A: Yes, provided all electrical specifications and package requirements are met. However, design validation and qualification documentation should be reviewed for each manufacturer's part to ensure compliance with application requirements and supply chain standards.

Q: What is the moisture sensitivity level for these parts?

A: All listed parts have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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