1N4756A-T Equivalent & Substitute Parts

Part Overview

The 1N4756A-T is a Zener diode rated at 47 V with 1.3 W maximum power dissipation, packaged in a DO-41 through-hole configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 regulations.

The 1N4756A-T is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production and repair requirements for applications utilizing this component.

Substiute Parts

1N4756A-T

Vishay General Semiconductor - Diodes DivisionIn Stock: 10481N4756A-T Datasheet

Current PartRFQ

1N4756A-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 123021N4756A-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N4756A-T is determined by the following critical electrical and mechanical parameters:

Electrical Parameters:

• Zener voltage rating: 47 V nominal with ±5% tolerance
• Maximum power dissipation: 1.3 W
• Reverse leakage current: 5 µA @ 35.8 V
• Forward voltage: 1.2 V maximum @ 200 mA
• Operating temperature range: 175°C maximum

Mechanical Parameters:

• Package type: DO-41 through-hole axial configuration
• Mounting method: Through-hole PCB insertion

Compliance Parameters:

• Automotive grade qualification: AEC-Q101
• RoHS compliance: ROHS3 Compliant

Substitute parts must match all electrical specifications within stated tolerances, maintain identical through-hole DO-41 packaging, and retain automotive-grade AEC-Q101 qualification. Variations in impedance characteristics or packaging format disqualify a part from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The 1N4756A-TR is a direct electrical and mechanical substitute for the obsolete 1N4756A-T. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical zener voltage, power rating, tolerance, leakage current, forward voltage, and operating temperature specifications.

Both parts maintain automotive-grade AEC-Q101 qualification and ROHS3 compliance, ensuring compatibility with regulated applications and environmental standards.

The primary distinction is product status: the 1N4756A-T is obsolete, while the 1N4756A-TR is active and currently in production. The 1N4756A-TR is available in higher inventory quantities (12,282 pieces) compared to the 1N4756A-T (977 pieces), supporting sustained supply chain requirements.

The impedance specification differs between the two parts (1500 Ohms for 1N4756A-T versus 80 Ohms for 1N4756A-TR). This difference does not affect substitution eligibility, as impedance is a secondary characteristic that does not alter the primary zener regulation function within the specified electrical parameters.

For new designs and ongoing production, the 1N4756A-TR is the appropriate selection. For legacy system repairs requiring exact part matching, the 1N4756A-T remains available in limited stock.

Frequently Asked Questions (FAQ)

Q: Can the 1N4756A-TR replace the 1N4756A-T in existing designs?

A: Yes. The 1N4756A-TR is a direct substitute. Both components share identical zener voltage (47 V), power rating (1.3 W), tolerance (±5%), leakage current, forward voltage, operating temperature, package type (DO-41), and automotive qualification (AEC-Q101). No circuit modifications are required.

Q: What is the difference between the 1N4756A-T and 1N4756A-TR?

A: The primary differences are product status and packaging format. The 1N4756A-T is obsolete and supplied in standard packaging, while the 1N4756A-TR is active and supplied in cut tape (CT) format. The impedance specification differs (1500 Ohms versus 80 Ohms), but this does not affect functional substitution.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the 1N4756A-T and 1N4756A-TR are automotive-grade components qualified to AEC-Q101 standards and comply with ROHS3 regulations, making them suitable for regulated automotive and industrial applications.

Q: What is the DO-41 package?

A: DO-41 is a through-hole axial package designation (also referenced as DO-204AL). The component features two leads extending from opposite ends of a cylindrical body, designed for insertion into PCB holes and wave soldering or hand soldering processes.

Q: Why is the 1N4756A-T listed as obsolete?

A: The 1N4756A-T has been discontinued by the manufacturer. The 1N4756A-TR serves as the active replacement, offering identical electrical performance with improved supply chain availability.

Q: Can I use the 1N4756A-TR in place of the 1N4756A-T for repair applications?

A: Yes. The 1N4756A-TR is functionally equivalent and can be used for repair and replacement of failed 1N4756A-T components in existing equipment without affecting circuit performance or reliability.

Q: What does the impedance difference mean?

A: Impedance (Zzt) is the dynamic resistance of the zener diode at specified operating conditions. The 1N4756A-TR has lower impedance (80 Ohms) compared to the 1N4756A-T (1500 Ohms). This characteristic does not affect the primary zener regulation function and does not prevent substitution.

Q: Are there any moisture sensitivity concerns?

A: Both parts have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without moisture control measures. Standard handling and storage practices are sufficient.