1N4745G Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4745G is a through-hole zener diode manufactured by Taiwan Semiconductor Corporation, rated for 16 V nominal zener voltage with 1 W maximum power dissipation. This component is classified as an active product and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the DO-204AL (DO-41) axial package family. Alternative sources and packaging formats are available to support procurement flexibility, inventory availability, and supply chain continuity.

Key Parameters

Parameter	Specification
Voltage - Zener (Nom) (Vz)	16 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max) (Zzt)	16 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 12.2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C to 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 1N4745G are qualified based on electrical parameter equivalence and mechanical compatibility. The substitution criteria are:

Electrical Parameters (Must Match):

Voltage - Zener (Nom) (Vz): 16 V
Tolerance: ±5%
Power - Max: 1 W
Impedance (Max) (Zzt): 16 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 12.2 V
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 200 mA
Operating Temperature Range: -65°C to 200°C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

All identified substitute parts meet these criteria. Variations in packaging format (Tape & Reel, Cut Tape, or Bulk) and supplier device package designation do not affect electrical or mechanical compatibility. Manufacturer differences reflect alternative qualified sources for the same functional specification.

Parameter Comparison

Parameter	1N4745G (Taiwan Semiconductor)	1N4745A,113 (Nexperia)	1N4745A-T50A (onsemi)	1N4745ATR (Fairchild)
Voltage - Zener (Nom) (Vz)	16 V	16 V	16 V	16 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	1 W
Impedance (Max) (Zzt)	16 Ohms	16 Ohms	16 Ohms	16 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 12.2 V	5 µA @ 12.2 V	5 µA @ 12.2 V	5 µA @ 12.2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	Not Specified	Not Specified
Operating Temperature Range	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	Not Specified

Engineering Selection Recommendations

All four parts listed are active products with equivalent electrical and mechanical specifications. Selection among these alternatives is based on procurement factors:

1N4745G (Taiwan Semiconductor Corporation): Primary specification reference. RoHS3 compliant. Supplied in Tape & Reel packaging. Current inventory: 1149 pcs.

1N4745A,113 (Nexperia USA Inc.): Parametric equivalent with RoHS3 compliance and MSL rating of 1 (Unlimited). Supplied in Cut Tape packaging. Current inventory: 2100 pcs.

1N4745A-T50A (onsemi): Parametric equivalent with RoHS3 compliance. Supplied in Cut Tape packaging. Current inventory: 5695 pcs.

1N4745ATR (Fairchild Semiconductor): Parametric equivalent supplied in Bulk packaging. Current inventory: 17506 pcs. RoHS status not specified in available data.

All parts share identical base product number 1N4745 and are classified under ECCN EAR99 and HTSUS 8541.10.0050. Selection should prioritize inventory availability, packaging requirements, and compliance documentation needs for the application.

Frequently Asked Questions (FAQ)

Q: Can 1N4745A,113 replace 1N4745G in a circuit?

A: Yes. Both parts are parametric equivalents with identical zener voltage (16 V), power rating (1 W), tolerance (±5%), impedance (16 Ohms), reverse leakage current (5 µA @ 12.2 V), and operating temperature range (-65°C to 200°C). Both use DO-41 axial through-hole packaging. The primary difference is packaging format (Cut Tape vs. Tape & Reel) and manufacturer source.

Q: What is the difference between the packaging formats listed?

A: Tape & Reel (TR), Cut Tape (CT), and Bulk are supply formats that affect handling and automated assembly compatibility. Electrically and mechanically, all formats contain identical components in DO-41 axial packages. Selection depends on assembly process requirements and quantity needs.

Q: Are all substitute parts RoHS3 compliant?

A: 1N4745G, 1N4745A,113, and 1N4745A-T50A are confirmed RoHS3 compliant. RoHS status for 1N4745ATR is not specified in available documentation.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes, for through-hole PCB designs. All parts use identical DO-41 axial package dimensions and pin configuration. No PCB layout modifications are required when substituting between these parts.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates the maximum deviation of the actual zener voltage from the nominal 16 V specification. This tolerance applies to all listed parts and determines the acceptable voltage range (15.2 V to 16.8 V) for circuit design calculations.

Q: Are forward voltage specifications available for all substitute parts?

A: Forward voltage (Vf) at 200 mA is specified as 1.2 V maximum for 1N4745G and 1N4745A,113. This specification is not provided in available data for 1N4745A-T50A and 1N4745ATR, though these parts are parametric equivalents with matching zener and reverse leakage characteristics.

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