MMSZ47T3G Equivalent & Substitute Parts

Part Overview

The MMSZ47T3G is an active-status zener diode manufactured by onsemi, rated for 47 V nominal zener voltage with 500 mW maximum power dissipation in a surface-mount SOD-123 package. This component is designed for voltage regulation and protection applications requiring stable reverse-bias operation across industrial and commercial temperature ranges. Substitute parts are identified to address inventory availability, extended temperature performance, automotive qualification requirements, or alternative manufacturer sourcing while maintaining functional compatibility within specified electrical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	47	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	170	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 32.9 V	—
Voltage - Forward (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-55°C to 150°C	—
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMSZ47T3G is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage (Vz) must equal 47 V nominal
Tolerance must be ±5% or tighter
Maximum power rating must be ≥500 mW
Package must be SOD-123 or SOD-123F (compatible footprint)
Operating temperature range must encompass -55°C to 150°C minimum
Surface-mount technology required

Secondary Compatibility Factors:

Impedance (Zzt) variation is acceptable within application-dependent limits
Reverse leakage current specifications may vary without affecting substitution validity
Forward voltage characteristics remain consistent across qualified substitutes
RoHS3 compliance and MSL-1 rating are standard across all listed parts

Substitution Categories:

Direct Manufacturer Equivalents (onsemi MMSZ series): MMSZ5261BT1G and MMSZ47T1G maintain identical electrical performance with SOD-123 packaging. MMSZ5261BT1G offers improved impedance characteristics (105 Ohms vs. 170 Ohms). MMSZ47T1G provides parametric equivalence with identical impedance and leakage specifications.

Automotive-Qualified Substitute (onsemi SZMMSZ series): SZMMSZ5261BT3G meets AEC-Q101 qualification and automotive-grade requirements with improved impedance performance, suitable for automotive and harsh-environment applications.

Cross-Manufacturer Alternatives (Diodes Incorporated and Nexperia): BZT52C47-7-F and BZT52H-C47,115 provide functional equivalence from alternative manufacturers. BZT52H-C47,115 includes automotive qualification and extended temperature range (-65°C to 150°C) with SOD-123F packaging.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Grade	Inventory
MMSZ47T3G	onsemi	47 V	±5%	500 mW	170 Ω	50 nA @ 32.9 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Standard	897 Pcs
MMSZ5261BT1G	onsemi	47 V	±5%	500 mW	105 Ω	100 nA @ 36 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Standard	4100 Pcs
SZMMSZ5261BT3G	onsemi	47 V	±5%	500 mW	105 Ω	100 nA @ 36 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Automotive (AEC-Q101)	10916 Pcs
MMSZ47T1G	onsemi	47 V	±5%	500 mW	170 Ω	50 nA @ 32.9 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Standard	1300 Pcs
BZT52C47-7-F	Diodes Incorporated	47 V	±6%	410 mW	100 Ω	100 nA @ 35 V	Not specified	-65°C to 150°C	SOD-123	Standard	4400 Pcs
BZT52H-C47,115	Nexperia USA Inc.	47 V	±5%	375 mW	90 Ω	50 nA @ 32.9 V	900 mV @ 10 mA	-65°C to 150°C	SOD-123F	Automotive (AEC-Q101)	3701 Pcs

Engineering Selection Recommendations

For Standard Industrial Applications: MMSZ5261BT1G is the primary substitute for MMSZ47T3G. Both parts maintain identical zener voltage, tolerance, power rating, and temperature range. MMSZ5261BT1G offers superior impedance performance (105 Ω vs. 170 Ω) and higher inventory availability (4100 units). MMSZ47T1G provides parametric equivalence with identical impedance and leakage characteristics, suitable when impedance matching to the original design is required.

For Automotive and Harsh-Environment Applications: SZMMSZ5261BT3G and BZT52H-C47,115 are qualified substitutes. SZMMSZ5261BT3G carries AEC-Q101 automotive qualification with onsemi manufacturing continuity and highest inventory (10916 units). BZT52H-C47,115 provides extended temperature range (-65°C to 150°C) and automotive qualification from Nexperia, with SOD-123F packaging compatibility.

For Extended Temperature Performance: BZT52C47-7-F and BZT52H-C47,115 both support -65°C lower operating limit compared to the standard -55°C specification. BZT52H-C47,115 maintains ±5% tolerance and automotive qualification. BZT52C47-7-F operates at ±6% tolerance with reduced power rating (410 mW vs. 500 mW).

For Cross-Manufacturer Sourcing: BZT52C47-7-F (Diodes Incorporated) and BZT52H-C47,115 (Nexperia) provide alternative supply chains. Both maintain 47 V zener voltage and SOD-123 package compatibility. Selection depends on tolerance requirements (±5% preferred) and power dissipation headroom in the application circuit.

Inventory Considerations: SZMMSZ5261BT3G offers maximum availability (10916 units) with automotive qualification. MMSZ5261BT1G provides 4100 units with standard-grade performance. BZT52C47-7-F supplies 4400 units from Diodes Incorporated.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5261BT1G directly replace MMSZ47T3G in existing designs?

A: Yes. Both parts maintain 47 V nominal zener voltage, ±5% tolerance, 500 mW power rating, and -55°C to 150°C operating range in SOD-123 packaging. MMSZ5261BT1G exhibits lower impedance (105 Ω vs. 170 Ω), which improves voltage regulation performance. No circuit modifications are required.

Q: What is the difference between MMSZ47T3G and MMSZ47T1G?

A: Both parts are onsemi MMSZ47 base products with identical electrical specifications: 47 V zener voltage, ±5% tolerance, 500 mW power, 170 Ω impedance, and -55°C to 150°C temperature range. The suffix designates different tape-and-reel packaging configurations. Selection depends on assembly equipment compatibility and tape specifications.

Q: Is SZMMSZ5261BT3G suitable for non-automotive applications?

A: Yes. SZMMSZ5261BT3G meets all electrical requirements for standard industrial applications. The automotive qualification (AEC-Q101) and automotive-grade designation indicate enhanced reliability and process control, making it suitable for any application requiring 47 V zener diodes in SOD-123 packaging.

Q: Why does BZT52H-C47,115 have lower power rating (375 mW) than MMSZ47T3G (500 mW)?

A: BZT52H-C47,115 is rated for 375 mW maximum power dissipation due to Nexperia's thermal design specifications for the SOD-123F package variant. Applications requiring full 500 mW dissipation must verify thermal performance or select alternatives with higher power ratings (MMSZ5261BT1G, MMSZ47T1G, or BZT52C47-7-F).

Q: Can BZT52C47-7-F replace MMSZ47T3G despite ±6% tolerance and 410 mW rating?

A: BZT52C47-7-F is functionally compatible for applications with tolerance margins. The ±6% tolerance (vs. ±5%) and 410 mW power rating (vs. 500 mW) represent reduced performance specifications. Selection requires circuit analysis to confirm acceptable voltage regulation and thermal margins. Extended temperature range (-65°C to 150°C) provides additional environmental capability.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed (MMSZ5261BT1G, SZMMSZ5261BT3G, MMSZ47T1G, BZT52C47-7-F, and BZT52H-C47,115) carry ROHS3 compliance certification. MSL-1 (Unlimited) moisture sensitivity applies uniformly across all parts.

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

A: SOD-123F is a variant of SOD-123 with identical electrical performance and footprint compatibility. BZT52H-C47,115 uses SOD-123F packaging. Both packages are compatible with standard SOD-123 assembly processes and PCB layouts.

Q: Which substitute offers the best impedance performance?

A: BZT52H-C47,115 provides the lowest impedance at 90 Ω, followed by BZT52C47-7-F and MMSZ5261BT1G at 100 Ω and 105 Ω respectively. Lower impedance improves voltage regulation stability. MMSZ47T3G and MMSZ47T1G operate at 170 Ω impedance.

Q: Is automotive qualification required for my application?

A: Automotive qualification (AEC-Q101) is mandatory for automotive, aerospace, and safety-critical applications. SZMMSZ5261BT3G and BZT52H-C47,115 carry AEC-Q101 certification. Standard-grade parts (MMSZ5261BT1G, MMSZ47T1G, BZT52C47-7-F) are suitable for industrial and commercial applications without automotive requirements.

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