ACZRA4738-HF Zener Diode Equivalent & Substitute Parts

Part Overview

The ACZRA4738-HF is an 8.2 V, 1 W Zener diode manufactured by Comchip Technology in DO-214AC (SMA) surface mount packaging. This component is classified as Active and carries AEC-Q101 automotive qualification. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in automotive and industrial circuits. Substitute parts may be required due to supply chain constraints, inventory availability, or design flexibility requirements while maintaining equivalent electrical and mechanical performance.

Substiute Parts

ACZRA4738-HF

Comchip TechnologyIn Stock: 1142ACZRA4738-HF Datasheet

Current PartRFQ

1SMA4738A

Good-Ark SemiconductorIn Stock: 151311SMA4738A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ACZRA4738-HF are determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Zener voltage (Vz): 8.2 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 1 W
• Impedance (Zzt): 4.5 Ohms maximum
• Reverse leakage current: 10 µA @ 6 V
• Forward voltage: 1.2 V maximum @ 200 mA
• Operating temperature range: -55°C to 150°C minimum

Mechanical Equivalence Criteria:

• Package type: DO-214AC (SMA) surface mount
• Mounting type: Surface mount
• RoHS3 compliance required
• Moisture sensitivity level: 1 (Unlimited)

Parts meeting all electrical and mechanical parameters listed above are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

ACZRA4738-HF (Comchip Technology)

• Active product status with established supply chain
• AEC-Q101 automotive qualification
• ROHS3 compliant, REACH unaffected
• Suitable for automotive and industrial applications requiring certified components
• Current inventory: 1095 pieces

1SMA4738A (Good-Ark Semiconductor)

• Active product status with higher inventory availability
• ROHS3 compliant, REACH unaffected
• Meets all critical electrical parameters for direct substitution
• Current inventory: 15107 pieces
• Packaging available in Cut Tape (CT) and Digi-Reel® in addition to Tape & Reel (TR)

Both parts satisfy the electrical and mechanical requirements for interchangeable use in circuits designed for 8.2 V, 1 W Zener diodes in DO-214AC packaging. Selection between these parts should be based on supply availability, inventory requirements, and specific qualification mandates of the end application.

Frequently Asked Questions (FAQ)

Q: Can the 1SMA4738A replace the ACZRA4738-HF in automotive applications?

A: The 1SMA4738A meets all specified electrical and mechanical parameters. However, the ACZRA4738-HF carries explicit AEC-Q101 automotive qualification. If AEC-Q101 certification is a design requirement, the ACZRA4738-HF is the specified choice. If automotive qualification is not mandated, the 1SMA4738A is electrically equivalent.

Q: What are the critical parameters that determine substitutability?

A: Substitutability is determined by: Zener voltage (8.2 V), tolerance (±5%), maximum power (1 W), impedance (4.5 Ohms maximum), reverse leakage current (10 µA @ 6 V), operating temperature range (-55°C to 150°C), and package type (DO-214AC SMA surface mount). All parameters must match for direct substitution.

Q: Are there packaging differences between these parts?

A: Both parts use DO-214AC (SMA) surface mount packaging. The 1SMA4738A is available in Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) formats, while the ACZRA4738-HF is specified in Tape & Reel (TR). Verify packaging format compatibility with assembly equipment before selection.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the ACZRA4738-HF and 1SMA4738A have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: What is the difference in impedance specifications?

A: Both parts specify a maximum impedance (Zzt) of 4.5 Ohms. This parameter is identical and does not differentiate the parts.