MMSZ5259B-HF Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5259B-HF is a 39 V, 500 mW surface mount zener diode manufactured by Comchip Technology in SOD-123 packaging. This component is classified as an active product and is ROHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Substitute parts may be required due to inventory availability, supply chain constraints, or design flexibility across multiple qualified manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 30 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	SOD-123
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MMSZ5259B-HF are qualified based on matching the following critical electrical and mechanical parameters:

Voltage - Zener (Nominal): 39 V
Tolerance: ±5%
Power - Maximum: 500 mW
Impedance (Maximum): 80 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 30 V
Operating Temperature Range: -55°C to 150°C
Package / Case: SOD-123
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain identical electrical performance characteristics and physical packaging specifications, ensuring direct functional interchangeability in circuit applications.

Parameter Comparison

Parameter	MMSZ5259B-HF (Comchip)	MMSZ5259B-AU_R1_000A1 (Panjit)	MMSZ5259BHE3-TP (Micro Commercial)	MMSZ5259B_R1_00001 (Panjit)
Manufacturer	Comchip Technology	Panjit International Inc.	Micro Commercial Co	Panjit International Inc.
Voltage - Zener (Nom)	39 V	39 V	39 V	39 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	80 Ohms	80 Ohms	80 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	Not specified	900 mV @ 10 mA	Not specified
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active
Grade	Standard	Automotive	Automotive	Standard
Qualification	Not specified	AEC-Q101	AEC-Q101	Not specified

Engineering Selection Recommendations

All four zener diode part numbers are active products with ROHS3 compliance and identical core electrical specifications. Selection among these substitutes is based on the following factors:

MMSZ5259B-AU_R1_000A1 (Panjit International Inc.) and MMSZ5259BHE3-TP (Micro Commercial Co) both carry automotive-grade qualification with AEC-Q101 certification. These parts are suitable for applications requiring automotive-level reliability and traceability.

MMSZ5259B_R1_00001 (Panjit International Inc.) is a standard-grade equivalent without automotive qualification, appropriate for general industrial and consumer applications.

MMSZ5259B-HF (Comchip Technology) remains the primary specification reference with standard-grade classification.

All parts maintain identical electrical performance, thermal operating range, and physical packaging, ensuring direct substitution capability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5259B-HF be directly replaced with MMSZ5259BHE3-TP?

A: Yes. Both components share identical zener voltage (39 V), power rating (500 mW), impedance (80 Ohms), reverse leakage current (100 nA @ 30 V), operating temperature range (-55°C to 150°C), and SOD-123 surface mount packaging. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between standard-grade and automotive-grade versions?

A: MMSZ5259B-AU_R1_000A1 and MMSZ5259BHE3-TP carry AEC-Q101 automotive qualification, indicating compliance with automotive reliability standards. MMSZ5259B-HF and MMSZ5259B_R1_00001 are standard-grade parts without this certification. Selection depends on application requirements; automotive applications may mandate AEC-Q101 certification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All four part numbers listed are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), meeting environmental and handling requirements for surface mount assembly.

Q: Does the SOD-123 package remain consistent across all substitutes?

A: Yes. All substitute parts use SOD-123 surface mount packaging with identical physical dimensions and land pattern requirements, enabling direct PCB layout compatibility without design modification.

Q: What inventory levels are available for each part?

A: MMSZ5259B-HF: 1095 Pcs; MMSZ5259B-AU_R1_000A1: 3756 Pcs; MMSZ5259BHE3-TP: 6843 Pcs; MMSZ5259B_R1_00001: 8685 Pcs. All parts are listed as new original stock.

Q: Can forward voltage specifications affect substitution decisions?

A: Forward voltage is specified for MMSZ5259B-HF (900 mV @ 10 mA) and MMSZ5259BHE3-TP (900 mV @ 10 mA). MMSZ5259B-AU_R1_000A1 and MMSZ5259B_R1_00001 do not provide forward voltage data in available specifications. For applications where forward voltage is a critical parameter, MMSZ5259B-HF or MMSZ5259BHE3-TP are preferred.

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