MMSZ5247BT1 Equivalent & Substitute Parts

Part Overview

The MMSZ5247BT1 is a Zener diode rated at 17 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute components maintain the core electrical specifications while offering improved availability and compliance with current regulatory standards.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	17	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	19	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 13 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 MMSZ5247BT1 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 17 V
Power - Max: 500 mW
Impedance (Max): 19 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 13 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
Operating Temperature: -55°C to 150°C

Mechanical Compatibility Criteria:

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

Substitute parts are grouped into two categories:

Direct Parametric Equivalents: Parts that match all electrical parameters and use SOD-123 packaging. These include onsemi MMSZ5247BT1G and MMSZ5247BT3G, as well as Vishay General Semiconductor variants (MMSZ5247B-E3-08, MMSZ5247B-E3-18, MMSZ5247B-G3-08, MMSZ5247B-G3-18). The onsemi SZMMSZ5247BT1G provides automotive-grade qualification with AEC-Q101 certification while maintaining identical electrical specifications.

Similar Parts with Parameter Variance: The Nexperia BZT52H-C18,115 operates at 18 V nominal (1 V higher) with reduced power rating (375 mW versus 500 mW) and uses SOD-123F packaging. This part is suitable only when the higher voltage specification is acceptable for the application.

Tolerance Variants: MMSZ5247C-E3-08 and MMSZ5247C-E3-18 provide tighter tolerance (±2% versus ±5%) while maintaining all other electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Product Status	RoHS Status
MMSZ5247BT1	onsemi	17	±5%	500	19	SOD-123	Obsolete	Non-compliant
MMSZ5247BT1G	onsemi	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247BT3G	onsemi	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
SZMMSZ5247BT1G	onsemi	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247B-E3-08	Vishay	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247B-E3-18	Vishay	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247B-G3-08	Vishay	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247B-G3-18	Vishay	17	±5%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247C-E3-08	Vishay	17	±2%	500	19	SOD-123	Active	ROHS3 Compliant
MMSZ5247C-E3-18	Vishay	17	±2%	500	19	SOD-123	Active	ROHS3 Compliant
BZT52H-C18,115	Nexperia	18	±5%	375	20	SOD-123F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

The onsemi MMSZ5247BT1G and MMSZ5247BT3G are the preferred direct replacements for the obsolete MMSZ5247BT1. Both parts maintain identical electrical specifications and SOD-123 packaging. MMSZ5247BT1G is available in higher inventory (20,100 units) and carries ROHS3 compliance. MMSZ5247BT3G offers equivalent performance with 8,352 units in stock.

Automotive-Grade Alternative:

The SZMMSZ5247BT1G provides identical electrical performance with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. This part is suitable for applications requiring automotive-level reliability and traceability. Inventory availability is 4,823 units.

Vishay General Semiconductor Alternatives:

The MMSZ5247B-E3-08, MMSZ5247B-E3-18, MMSZ5247B-G3-08, and MMSZ5247B-G3-18 are parametric equivalents from Vishay with identical electrical specifications and SOD-123 packaging. All variants are ROHS3 compliant and active products. Selection among these variants depends on internal Vishay product line designations (E3 versus G3, 08 versus 18 suffixes) and specific supply chain requirements.

Tighter Tolerance Variants:

MMSZ5247C-E3-08 and MMSZ5247C-E3-18 provide ±2% tolerance compared to the ±5% tolerance of the original part. These are suitable for applications requiring improved voltage regulation accuracy while maintaining all other electrical parameters.

Limited Compatibility Alternative:

The Nexperia BZT52H-C18,115 operates at 18 V nominal with 375 mW power rating and SOD-123F packaging. This part is suitable only when the application circuit can tolerate the 1 V higher zener voltage and reduced power dissipation capability. The SOD-123F package is mechanically compatible with SOD-123 footprints in most PCB designs.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5247BT1G be used as a direct replacement for MMSZ5247BT1?

A: Yes. MMSZ5247BT1G maintains identical electrical specifications (17 V nominal, 500 mW, ±5% tolerance) and SOD-123 packaging. The primary difference is product status (active versus obsolete) and ROHS3 compliance. MMSZ5247BT1G is the recommended direct substitute.

Q: What is the difference between MMSZ5247BT1G and MMSZ5247BT3G?

A: Both parts are onsemi products with identical electrical specifications and SOD-123 packaging. The difference lies in internal product line designations (T1G versus T3G series). Both are active products with ROHS3 compliance. Selection depends on supply chain availability and internal onsemi product line management.

Q: When should SZMMSZ5247BT1G be selected instead of MMSZ5247BT1G?

A: SZMMSZ5247BT1G is the automotive-grade variant with AEC-Q101 qualification. Select this part when the application requires automotive-level reliability, traceability, or compliance with automotive supply chain standards. Electrical specifications are identical to MMSZ5247BT1G.

Q: Are Vishay MMSZ5247B variants interchangeable with onsemi parts?

A: Yes. Vishay MMSZ5247B-E3-08, MMSZ5247B-E3-18, MMSZ5247B-G3-08, and MMSZ5247B-G3-18 are parametric equivalents with identical electrical specifications and SOD-123 packaging. All are ROHS3 compliant and active products. Interchangeability is based on electrical equivalence and mechanical compatibility.

Q: What is the advantage of MMSZ5247C variants over MMSZ5247B variants?

A: MMSZ5247C variants provide tighter voltage tolerance (±2% versus ±5%). All other electrical parameters remain identical. Select MMSZ5247C variants when the application requires improved voltage regulation accuracy.

Q: Can BZT52H-C18,115 replace MMSZ5247BT1 in all applications?

A: No. BZT52H-C18,115 operates at 18 V nominal (1 V higher) with reduced power rating (375 mW versus 500 mW). This part is suitable only when the application circuit can tolerate the higher zener voltage and reduced power dissipation. The SOD-123F package is mechanically compatible with SOD-123 footprints.

Q: What does the packaging designation "Tape & Reel (TR)" mean?

A: Tape & Reel packaging indicates the component is supplied on continuous tape wound on a reel for automated assembly equipment. This is standard for high-volume production. The physical component remains in SOD-123 or SOD-123F package format.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MMSZ5247BT1 is marked as RoHS non-compliant due to its obsolete status. ROHS3 compliance is a standard requirement for all active onsemi, Vishay, and Nexperia products in this category.

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

A: SOD-123F is a variant of SOD-123 with modified lead geometry. Both packages are mechanically compatible with standard SOD-123 PCB footprints in most applications. The BZT52H-C18,115 uses SOD-123F packaging while all other substitutes use standard SOD-123.

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