AMMSZ5257A-HF Equivalent & Substitute Parts

Part Overview

The AMMSZ5257A-HF is a surface mount Zener diode manufactured by Comchip Technology, rated at 33 V nominal Zener voltage with 500 mW maximum power dissipation. This component operates across the automotive temperature range of -50°C to 150°C and carries AEC-Q101 qualification, making it suitable for automotive and industrial applications requiring voltage regulation and transient protection.

The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOD-123 surface mount package category.

Substiute Parts

AMMSZ5257A-HF

Comchip TechnologyIn Stock: 787AMMSZ5257A-HF Datasheet

Current PartRFQ

MMSZ5257A_R1_00001

Panjit International Inc.In Stock: 3708MMSZ5257A_R1_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AMMSZ5257A-HF is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Zener voltage: 33 V nominal
• Tolerance: ±2%
• Maximum power dissipation: 500 mW
• Impedance (maximum): 58 Ohms
• Reverse leakage current: 100 nA @ 25 V
• Forward voltage: 900 mV @ 10 mA

Mechanical & Environmental Specifications:

• Package type: SOD-123 surface mount
• Operating temperature range: -50°C to 150°C
• Mounting configuration: Surface mount

Compliance & Regulatory:

• RoHS3 compliance
• Moisture sensitivity level: 1 (Unlimited)

The substitute part MMSZ5257A_R1_00001 manufactured by Panjit International Inc. meets all specified electrical and mechanical parameters, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: AMMSZ5257A-HF

The AMMSZ5257A-HF is recommended for applications requiring automotive-grade qualification. This part carries AEC-Q101 certification, indicating compliance with automotive reliability and quality standards. The Comchip Technology manufacturer designation and active product status ensure long-term availability and supply chain stability for automotive and industrial designs.

Substitute Part: MMSZ5257A_R1_00001

The MMSZ5257A_R1_00001 from Panjit International Inc. provides functional equivalence across all specified electrical parameters and mechanical dimensions. This substitute maintains identical Zener voltage, power rating, impedance, and reverse leakage characteristics. Both parts are ROHS3 compliant with MSL 1 rating, supporting identical handling and storage requirements. The substitute part is currently in active production status with higher inventory availability (3659 units in stock versus 691 units for the primary part).

Selection between these parts should be based on supply chain requirements, lead time considerations, and design qualification status rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5257A_R1_00001 be used as a direct replacement for AMMSZ5257A-HF?

A: Yes. Both parts are electrically equivalent across all specified parameters: 33 V Zener voltage, ±2% tolerance, 500 mW power rating, 58 Ohms maximum impedance, and 100 nA reverse leakage current. Both are packaged in SOD-123 surface mount configuration and operate across -50°C to 150°C. Direct PCB substitution is supported without circuit modification.

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

A: SOD-123 is a standardized surface mount package for small signal diodes. Both the primary part and substitute part use this identical package, ensuring mechanical compatibility with PCB footprints, reflow soldering profiles, and automated assembly equipment. No layout or assembly process changes are required when substituting between these parts.

Q: Are there differences in automotive qualification between these parts?

A: The AMMSZ5257A-HF carries explicit AEC-Q101 automotive qualification. The MMSZ5257A_R1_00001 specification does not indicate AEC-Q101 certification in the provided data. For applications requiring automotive qualification documentation, the AMMSZ5257A-HF is the specified choice. For non-automotive applications or where automotive qualification is not contractually required, the Panjit substitute provides electrical equivalence.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the lowest moisture sensitivity level. Components with this rating do not require special moisture control during storage, handling, or assembly. Both parts can be stored and processed under standard industrial conditions without desiccant packaging or baking procedures prior to reflow soldering.

Q: Are there inventory or lead time advantages to using the substitute part?

A: The MMSZ5257A_R1_00001 currently has 3659 units in stock compared to 691 units for the AMMSZ5257A-HF. Higher inventory availability may provide shorter lead times and improved supply chain flexibility for high-volume production requirements.

Q: What compliance standards apply to both parts?

A: Both parts are ROHS3 compliant, indicating compliance with the Restriction of Hazardous Substances Directive. Both carry ECCN classification EAR99 and HTSUS code 8541.10.0050 for tariff and export control purposes. These regulatory classifications are identical between the primary and substitute parts.