MMSZ5247B Equivalent & Substitute Parts

Part Overview

The MMSZ5247B is a Zener diode rated at 17 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain electrical compatibility across voltage regulation, power handling, and thermal operating ranges while accommodating packaging and qualification requirements.

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°C ~ 150°C	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility with the MMSZ5247B:

Direct Manufacturer Substitutes maintain identical electrical specifications across all critical parameters: 17 V nominal zener voltage, ±5% tolerance, 500 mW power rating, 19 Ohms maximum impedance, 100 nA reverse leakage at 13 V, and 900 mV forward voltage at 10 mA. These parts differ only in product status (active versus obsolete) and packaging configuration (Tape & Reel). Parts in this category include MMSZ4704T1G, MMSZ5247BT1G, SZMMSZ4704T1G, MMSZ5247BT3G, and SZMMSZ5247BT1G.

Parametric Equivalents satisfy the core functional requirements of 17 V zener voltage and 500 mW power dissipation with matching tolerance and forward voltage characteristics. These parts maintain compatibility within the specified operating temperature range and package form factor while offering active product status and RoHS3 compliance.

Similar Parts provide functional equivalence with minor deviations in secondary parameters such as impedance, reverse leakage current, or operating temperature range. These parts include alternatives from different manufacturers (Nexperia, Central Semiconductor, Diodes Incorporated, Micro Commercial Co) that meet the primary voltage and power requirements while offering extended temperature ranges or automotive-grade qualifications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	Status
MMSZ5247B	onsemi	17	±5%	500	19	100 @ 13V	900 @ 10mA	-55 ~ 150	SOD-123	Obsolete
MMSZ4704T1G	onsemi	17	±5%	500	—	50 @ 12.9V	900 @ 10mA	-55 ~ 150	SOD-123	Active
MMSZ5247BT1G	onsemi	17	±5%	500	19	100 @ 13V	900 @ 10mA	-55 ~ 150	SOD-123	Active
SZMMSZ4704T1G	onsemi	17	±5%	500	—	50 @ 12.9V	900 @ 10mA	-55 ~ 150	SOD-123	Active
MMSZ5247BT3G	onsemi	17	±5%	500	19	100 @ 13V	900 @ 10mA	-55 ~ 150	SOD-123	Active
SZMMSZ5247BT1G	onsemi	17	±5%	500	19	100 @ 13V	900 @ 10mA	-55 ~ 150	SOD-123	Active
BZT52H-C18,115	Nexperia USA Inc.	18	±5%	375	20	50 @ 12.6V	900 @ 10mA	-65 ~ 150	SOD-123F	Active
CMHZ5247B TR PBFREE	Central Semiconductor Corp	17	±5%	500	19	100 @ 13V	900 @ 10mA	-65 ~ 150	SOD-123	Active
DDZ17-7	Diodes Incorporated	17	±3%	500	23	50 @ 14V	900 @ 10mA	-65 ~ 150	SOD-123	Active
DDZ9704-7	Diodes Incorporated	17	±5%	500	—	50 @ 12.9V	900 @ 10mA	-65 ~ 150	SOD-123	Active
MMSZ4704-TP	Micro Commercial Co	17	±5%	500	—	50 @ 12.9V	950 @ 10mA	-55 ~ 150	SOD-123	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

MMSZ5247BT1G and MMSZ5247BT3G are direct onsemi substitutes with active product status. Both maintain identical electrical specifications to the MMSZ5247B, including 17 V zener voltage, ±5% tolerance, 500 mW power rating, 19 Ohms impedance, and 100 nA reverse leakage. These parts are RoHS3 compliant and suitable for direct replacement in existing designs.

SZMMSZ5247BT1G provides equivalent electrical performance with automotive-grade qualification (AEC-Q101) and active product status. This part is appropriate for applications requiring automotive-level reliability and traceability.

Secondary Substitutes (Functional Equivalence)

MMSZ4704T1G and DDZ9704-7 maintain 17 V zener voltage and 500 mW power dissipation with ±5% tolerance. These parts exhibit lower reverse leakage current (50 nA versus 100 nA) and are available from active product lines. MMSZ4704T1G is an onsemi product with RoHS3 compliance. DDZ9704-7 is manufactured by Diodes Incorporated with extended operating temperature range (-65°C to 150°C).

SZMMSZ4704T1G combines onsemi manufacturing with automotive-grade qualification and active status, offering enhanced reliability for automotive applications.

Alternative Substitutes (Extended Temperature or Certification)

CMHZ5247B TR PBFREE from Central Semiconductor Corp provides identical electrical specifications with extended lower operating temperature limit (-65°C versus -55°C) and RoHS3 compliance.

DDZ17-7 from Diodes Incorporated offers tighter tolerance (±3% versus ±5%), extended temperature range (-65°C to 150°C), and active product status. Higher impedance (23 Ohms) may affect circuit performance in applications sensitive to dynamic impedance.

Limited Compatibility Substitute

BZT52H-C18,115 from Nexperia differs in zener voltage (18 V versus 17 V), power rating (375 mW versus 500 mW), and package variant (SOD-123F versus SOD-123). This part is suitable only for applications where 18 V zener voltage and reduced power dissipation are acceptable.

MMSZ4704-TP from Micro Commercial Co exhibits slightly elevated forward voltage (950 mV versus 900 mV at 10 mA), which may impact circuit performance in sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5247BT1G directly replace MMSZ5247B in production?

A: Yes. MMSZ5247BT1G maintains identical electrical specifications across all critical parameters: 17 V nominal zener voltage, ±5% tolerance, 500 mW power dissipation, 19 Ohms impedance, and 100 nA reverse leakage at 13 V. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel). No circuit redesign is required.

Q: What is the difference between MMSZ5247BT1G and MMSZ5247BT3G?

A: Both parts are onsemi products with identical electrical specifications and active product status. The designation suffix (T1G versus T3G) indicates different manufacturing batches or tape configurations. Electrical performance and compatibility are equivalent.

Q: Is SZMMSZ5247BT1G suitable for automotive applications?

A: Yes. SZMMSZ5247BT1G carries automotive-grade qualification (AEC-Q101) and is designated for automotive use. It maintains identical electrical specifications to the standard MMSZ5247BT1G while meeting automotive reliability and traceability requirements.

Q: Can BZT52H-C18,115 replace MMSZ5247B?

A: No. BZT52H-C18,115 has a nominal zener voltage of 18 V (versus 17 V) and reduced power rating of 375 mW (versus 500 mW). These differences result in incompatible voltage regulation and thermal performance. This part is suitable only for applications specifically designed for 18 V zener voltage.

Q: What is the significance of the SOD-123F package variant in BZT52H-C18,115?

A: SOD-123F is a variant of the standard SOD-123 package with different lead geometry. While both are surface mount packages, SOD-123F components may not be compatible with PCB footprints designed for standard SOD-123 packages. Verify footprint compatibility before substitution.

Q: Does DDZ17-7 offer advantages over MMSZ5247BT1G?

A: DDZ17-7 provides tighter tolerance (±3% versus ±5%) and extended lower operating temperature limit (-65°C versus -55°C). However, it exhibits higher impedance (23 Ohms versus 19 Ohms), which may affect dynamic performance in applications sensitive to impedance variation. Evaluate circuit requirements before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance status. The original MMSZ5247B does not specify RoHS status. Verify RoHS compliance requirements for your application before final part selection.

Q: What is the impact of reverse leakage current differences between substitutes?

A: The MMSZ5247B specifies 100 nA reverse leakage at 13 V. Substitutes such as MMSZ4704T1G and DDZ9704-7 specify 50 nA at 12.9 V, indicating lower leakage. Lower leakage current reduces standby power consumption and improves voltage regulation stability. This difference is beneficial in most applications.

Q: Can MMSZ4704-TP be used despite higher forward voltage specification?

A: MMSZ4704-TP specifies 950 mV forward voltage at 10 mA versus 900 mV for MMSZ5247B. This 50 mV difference may impact circuit performance in applications with tight voltage tolerances or high current paths. Evaluate forward voltage impact on circuit operation before substitution.

Q: Is inventory availability a factor in part selection?

A: Inventory levels are provided for reference. MMSZ5247B shows 85,600 pieces in stock (obsolete status). Active substitutes with substantial inventory include SZMMSZ4704T1G (56,200 pieces), DDZ17-7 (155,200 pieces), and MMSZ5247BT1G (20,100 pieces). Verify current availability with suppliers for production planning.

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