1N4745A-T Equivalent & Substitute Parts

Part Overview

The 1N4745A-T is a Zener diode rated at 16 V nominal 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 requirements.

The 1N4745A-T is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements. Direct substitutes maintain identical electrical performance while offering improved availability and active product status.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5	%
Power - Max	1.3	W
Impedance (Max)	700	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 12.2 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	175	°C
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the 1N4745A-T is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 16 V nominal
Power rating: 1.3 W maximum
Tolerance: ±5%
Reverse leakage current: 5 µA @ 12.2 V
Forward voltage: 1.2 V @ 200 mA
Operating temperature: 175°C
Package type: DO-41 through-hole axial configuration
Automotive grade and AEC-Q101 qualification

The 1N4745A-TR is a direct electrical equivalent manufactured by the same supplier. Both parts share identical base product number 1N4745 and maintain all specified electrical characteristics. The primary difference is packaging format: the 1N4745A-T is supplied in standard tube packaging, while the 1N4745A-TR is supplied in cut tape format. Both are through-hole components with identical DO-41 package geometry and pin configuration.

Parameter Comparison

Parameter	1N4745A-T	1N4745A-TR	Match
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Yes
Category	Diodes, Zener	Diodes, Zener	Yes
Voltage - Zener (Nom)	16 V	16 V	Yes
Tolerance	±5%	±5%	Yes
Power - Max	1.3 W	1.3 W	Yes
Current - Reverse Leakage @ Vr	5 µA @ 12.2 V	5 µA @ 12.2 V	Yes
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	Yes
Operating Temperature	175°C	175°C (TJ)	Yes
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Yes
Mounting Type	Through Hole	Through Hole	Yes
Grade	Automotive	Automotive	Yes
Qualification	AEC-Q101	AEC-Q101	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Product Status	Obsolete	Active	Different
Packaging Format	Standard Tube	Cut Tape (CT)	Different

Engineering Selection Recommendations

The 1N4745A-TR is the direct substitute for the 1N4745A-T. Both components are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications and automotive-grade qualifications.

Selection Basis:

The 1N4745A-TR is recommended for new designs and ongoing production due to its active product status. The 1N4745A-T, classified as obsolete, presents supply chain risk and should be replaced in active applications.

Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance, ensuring regulatory and quality standards are maintained across substitution. The electrical parameters—including 16 V nominal Zener voltage, 1.3 W power rating, ±5% tolerance, and all leakage and forward voltage specifications—are identical between the two parts.

The packaging difference (standard tube versus cut tape) does not affect electrical performance or mechanical compatibility. The DO-41 through-hole package geometry and pin configuration remain unchanged. Selection between these packaging formats depends on assembly process requirements and inventory management practices.

Frequently Asked Questions (FAQ)

Q: Can the 1N4745A-TR be used as a direct replacement for the 1N4745A-T in existing designs?

A: Yes. The 1N4745A-TR is electrically and mechanically identical to the 1N4745A-T. All electrical parameters, package dimensions, and pin configurations match. The component can be substituted without circuit modification.

Q: What is the difference between the 1N4745A-T and 1N4745A-TR?

A: The primary difference is packaging format. The 1N4745A-T is supplied in standard tube packaging, while the 1N4745A-TR is supplied in cut tape format. Both are DO-41 through-hole components with identical electrical specifications and physical dimensions.

Q: Why is the 1N4745A-T classified as obsolete?

A: The 1N4745A-T has been superseded by the 1N4745A-TR. The newer part number maintains all electrical and mechanical specifications while offering improved supply chain availability and active product status.

Q: Are there any compliance or qualification differences between these parts?

A: No. Both the 1N4745A-T and 1N4745A-TR carry identical AEC-Q101 automotive qualification and ROHS3 compliance. Regulatory and quality standards are maintained across substitution.

Q: What are the critical electrical parameters that define substitution for this Zener diode?

A: Substitution is determined by matching the following parameters: 16 V nominal Zener voltage, ±5% tolerance, 1.3 W maximum power dissipation, 5 µA reverse leakage current at 12.2 V, and 1.2 V maximum forward voltage at 200 mA. All parameters must match exactly for direct substitution.

Q: Can the 1N4745A-TR be used in automated assembly processes?

A: Yes. The 1N4745A-TR is supplied in cut tape format, which is compatible with standard tape-and-reel automated component placement equipment. The 1N4745A-T in tube packaging requires manual handling or tube-feeding equipment.

Q: What is the operating temperature range for these components?

A: Both the 1N4745A-T and 1N4745A-TR are rated for operation up to 175°C junction temperature. This specification applies to both parts identically.

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