AMMSZ5255A-HF Zener Diode Equivalent & Substitute Parts

Part Overview

The AMMSZ5255A-HF is a 28 V, 500 mW Zener diode manufactured by Comchip Technology in SOD-123 surface mount packaging. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. The device is used in voltage regulation and protection circuits where precise 28 V reference voltage is required. Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and compliance certifications to ensure direct functional replacement in existing designs.

Substiute Parts

AMMSZ5255A-HF

Comchip TechnologyIn Stock: 1107AMMSZ5255A-HF Datasheet

Current PartRFQ

MMSZ5255A_R1_00001

Panjit International Inc.In Stock: 11872MMSZ5255A_R1_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AMMSZ5255A-HF are identified through parametric equivalence. The substitution logic is based on the following critical parameters that must match exactly:

• Voltage - Zener (Nominal): 28 V
• Tolerance: ±2%
• Power - Maximum: 500 mW
• Impedance (Maximum): 44 Ohms
• Current - Reverse Leakage @ Vr: 100 nA @ 21 V
• Operating Temperature Range: -50°C to 150°C
• Package / Case: SOD-123
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Parts meeting all these criteria are classified as parametric equivalents and can be used as direct substitutes in circuit applications without design modification.

Parameter Comparison

Engineering Selection Recommendations

The MMSZ5255A_R1_00001 manufactured by Panjit International Inc. is a parametric equivalent to the AMMSZ5255A-HF. Both components are active products with identical electrical specifications, mechanical packaging, and compliance certifications. The substitute part maintains the same 28 V nominal Zener voltage, ±2% tolerance, 500 mW power rating, and SOD-123 surface mount package. Both devices are RoHS3 compliant with MSL 1 rating and operate across the identical temperature range of -50°C to 150°C.

Selection between these parts is based on availability, lead time, and supply chain requirements, as all functional and compliance parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5255A_R1_00001 be used as a direct replacement for AMMSZ5255A-HF?

A: Yes. The MMSZ5255A_R1_00001 is a parametric equivalent with identical Zener voltage (28 V), tolerance (±2%), power rating (500 mW), impedance (44 Ohms), reverse leakage current (100 nA @ 21 V), operating temperature range (-50°C to 150°C), and SOD-123 packaging. No circuit design changes are required.

Q: Are there any differences in compliance or certifications?

A: Both parts are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The AMMSZ5255A-HF includes AEC-Q101 automotive qualification. Compliance certifications are equivalent for general industrial applications.

Q: What is the significance of the SOD-123 package?

A: SOD-123 is a surface mount diode package with standardized footprint dimensions. Both the main part and substitute use this identical package, ensuring mechanical and electrical compatibility on PCBs without layout modifications.

Q: How do the impedance specifications affect substitution?

A: Both parts specify 44 Ohms maximum impedance at the Zener voltage. This parameter determines the dynamic response of the Zener diode in regulation circuits. Matching impedance ensures equivalent circuit performance.

Q: What does the ±2% tolerance mean for substitution?

A: The ±2% tolerance on the 28 V nominal Zener voltage means the actual voltage can range from 27.44 V to 28.56 V. Both parts share this tolerance, ensuring equivalent voltage regulation performance in applications.

Q: Are there inventory or availability considerations?

A: The AMMSZ5255A-HF has 1030 pieces in stock, while MMSZ5255A_R1_00001 has 11796 pieces available. Availability may influence selection based on project timelines and supply requirements.