MMSZ5246B-7 Equivalent & Substitute Parts

Part Overview

The MMSZ5246B-7 is a 16 V, 500 mW Zener diode manufactured by Diodes Incorporated in SOD-123 surface mount package. This component is designed for voltage regulation and protection applications requiring precise 16 V reference voltage with ±5% tolerance. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	16 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	17 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MMSZ5246B-7 is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 16 V nominal
Tolerance: ±5%
Power dissipation: 500 mW maximum
Impedance: 17 Ohms maximum
Reverse leakage current: 100 nA @ 12 V
Forward voltage: 900 mV @ 10 mA

Mechanical Criteria:

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

Compliance Criteria:

RoHS status (original part is non-compliant; substitutes may be RoHS3 compliant)
Moisture sensitivity level: 1 (Unlimited)

Substitute parts must match all primary electrical parameters and the SOD-123 package specification. Operating temperature range variations are acceptable provided the substitute covers the minimum required range. Parts with identical electrical specifications but different packaging formats (such as SOD-123F) or different manufacturers are listed as alternatives when electrical parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Product Status	RoHS
MMSZ5246B-7	Diodes Incorporated	16	±5%	500	17	100 nA @ 12 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Discontinued	Non-compliant
MMSZ5246B-7-F	Diodes Incorporated	16	±5%	500	17	100 nA @ 12 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active	RoHS3
BZT52H-C16,115	Nexperia USA Inc.	16	±5%	375	20	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	SOD-123F	Active	RoHS3
MMSZ16T1G	onsemi	16	±5%	500	40	50 nA @ 11.2 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	RoHS3
MMSZ4703-G3-08	Vishay General Semiconductor	16	±5%	500	Not specified	50 nA @ 12.1 V	Not specified	-55 to 150°C	SOD-123	Active	RoHS3
MMSZ4703T1G	onsemi	16	±5%	500	Not specified	50 nA @ 12.1 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	RoHS3
MMSZ5246B-E3-08	Vishay General Semiconductor	16	±5%	500	17	100 nA @ 12 V	Not specified	-55 to 150°C	SOD-123	Active	RoHS3
MMSZ5246B-E3-18	Vishay General Semiconductor	16	±5%	500	17	100 nA @ 12 V	Not specified	-55 to 150°C	SOD-123	Active	RoHS3
MMSZ5246B-HE3-08	Vishay General Semiconductor	16	±5%	500	17	100 nA @ 12 V	Not specified	-55 to 150°C	SOD-123	Obsolete	RoHS3
MMSZ5246B-TP	Micro Commercial Co	16	±5%	500	17	100 nA @ 12 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	RoHS3
MMSZ5246BT1G	onsemi	16	±5%	500	17	100 nA @ 12 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	RoHS3

Engineering Selection Recommendations

Primary Recommendation: MMSZ5246B-7-F

The MMSZ5246B-7-F is the direct equivalent to the MMSZ5246B-7, manufactured by Diodes Incorporated with identical electrical specifications and SOD-123 packaging. This part maintains all critical parameters including 17 Ohms impedance, 100 nA reverse leakage, and 500 mW power rating. The primary difference is RoHS3 compliance and active product status. This part is the preferred substitute for direct replacement applications.

Secondary Recommendations: MMSZ5246B-TP and MMSZ5246BT1G

Both MMSZ5246B-TP (Micro Commercial Co) and MMSZ5246BT1G (onsemi) provide complete electrical equivalence with the original part, including 17 Ohms impedance and 100 nA reverse leakage current. Both are RoHS3 compliant and actively manufactured. Operating temperature range is reduced to -55°C to 150°C, which is acceptable for most applications not requiring the extended -65°C lower limit.

Alternative Consideration: MMSZ5246B-E3-08

The MMSZ5246B-E3-08 from Vishay General Semiconductor maintains electrical equivalence with 17 Ohms impedance and 100 nA reverse leakage. This part is actively manufactured and RoHS3 compliant. Operating temperature range is -55°C to 150°C.

Limited Substitution: MMSZ16T1G

The MMSZ16T1G from onsemi meets the 16 V, 500 mW, ±5% tolerance requirements but exhibits higher impedance (40 Ohms maximum) compared to the original 17 Ohms specification. This part is suitable only for applications where impedance variation is not critical. Operating temperature range is -55°C to 150°C.

Not Recommended: BZT52H-C16,115

The BZT52H-C16,115 from Nexperia has reduced power rating (375 mW versus 500 mW) and uses SOD-123F package instead of SOD-123. While electrically similar in voltage and tolerance, the power limitation and package difference make this unsuitable for direct replacement.

Not Recommended: MMSZ5246B-HE3-08

The MMSZ5246B-HE3-08 is obsolete and should not be selected for new designs or ongoing production.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5246B-7-F be used as a direct replacement for MMSZ5246B-7?

A: Yes. The MMSZ5246B-7-F is electrically and mechanically identical to the MMSZ5246B-7, with the same 16 V nominal voltage, ±5% tolerance, 500 mW power rating, 17 Ohms impedance, and SOD-123 package. The primary difference is RoHS3 compliance and active manufacturing status.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of the SOD-123 package with different dimensional specifications. While both are surface mount packages for small signal diodes, they are not mechanically interchangeable. The BZT52H-C16,115 uses SOD-123F and cannot be used in designs requiring SOD-123 footprints.

Q: Why does MMSZ16T1G have higher impedance (40 Ohms) than the original part (17 Ohms)?

A: Impedance variation is a characteristic difference between manufacturers and product lines. The MMSZ16T1G from onsemi meets the 16 V voltage and 500 mW power specifications but operates with different internal characteristics. This part is suitable only for applications where impedance tolerance is not a critical design parameter.

Q: Is the reduced operating temperature range (-55°C to 150°C versus -65°C to 150°C) significant?

A: The reduced lower temperature limit of -55°C is acceptable for most commercial and industrial applications. Only applications requiring operation below -55°C require the original MMSZ5246B-7 or MMSZ5246B-7-F with the extended -65°C specification.

Q: Can MMSZ4703-G3-08 or MMSZ4703T1G be used as substitutes?

A: These parts meet the 16 V, 500 mW, ±5% tolerance requirements and use the SOD-123 package. However, reverse leakage current specifications differ (50 nA @ 12.1 V versus 100 nA @ 12 V), and impedance values are not specified. These parts are suitable only for applications where the lower reverse leakage is acceptable and impedance variation is not critical.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. The original MMSZ5246B-7 is RoHS non-compliant. Most substitute parts are RoHS3 compliant, which is required for many applications, particularly in consumer electronics and regulated industries.

Q: Are there packaging format differences among the substitute parts?

A: Yes. Most substitutes are available in Tape & Reel (TR) or Cut Tape (CT) formats. MMSZ5246B-7-F is available in Cut Tape & Digi-Reel format. Packaging format affects handling and assembly processes but does not impact electrical performance. Verify packaging compatibility with your assembly equipment and procurement requirements.

Q: Which substitute part has the highest inventory availability?

A: MMSZ5246BT1G from onsemi has the highest inventory at 133,400 pieces. MMSZ4703T1G from onsemi also has high availability at 125,400 pieces. MMSZ5246B-7-F from Diodes Incorporated has 45,300 pieces available.

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