1N4743AP-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4743AP-TP is a 13 V, 1 W Zener diode manufactured by Micro Commercial Co in DO-41 axial through-hole packaging. This component is classified as Active and maintains full RoHS3 compliance. Zener diodes of this specification are used in voltage regulation and protection circuits where precise voltage reference and power dissipation characteristics are required. Substitute parts may be necessary due to inventory availability, packaging format preferences, or supply chain considerations while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 9.9 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4743AP-TP are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Parameters (Must Match):

Voltage - Zener (Nominal): 13 V
Tolerance: ±5%
Power - Maximum: 1 W
Impedance (Maximum): 10 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 9.9 V

Mechanical Parameters (Must Match):

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

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
ECCN: EAR99
HTSUS: 8541.10.0050

All substitute parts listed maintain identical electrical specifications and through-hole axial packaging. Variations in packaging format (Tape & Reel, Cut Tape, or Bulk) and operating temperature range do not affect functional substitution within the specified electrical parameters.

Parameter Comparison

Parameter	1N4743AP-TP (Micro Commercial Co)	1N4743A-T50A (onsemi)	1N4743ATR (Fairchild Semiconductor)
Voltage - Zener (Nominal)	13 V	13 V	13 V
Tolerance	±5%	±5%	±5%
Power - Maximum	1 W	1 W	1 W
Impedance (Maximum)	10 Ohms	10 Ohms	10 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 9.9 V	5 µA @ 9.9 V	5 µA @ 9.9 V
Operating Temperature Range	-65°C ~ 150°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Bulk
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not Specified
Product Status	Active	Active	Active

Engineering Selection Recommendations

1N4743A-T50A (onsemi) is a direct electrical equivalent with identical zener voltage, tolerance, power rating, and impedance specifications. This substitute is supplied in Cut Tape packaging and maintains ROHS3 compliance. The extended operating temperature range (-65°C ~ 200°C) provides additional thermal margin compared to the main part. This substitute is suitable for applications where the higher temperature rating is beneficial or where Cut Tape packaging format is preferred.

1N4743ATR (Fairchild Semiconductor) is a direct electrical equivalent with identical zener voltage, tolerance, power rating, and impedance specifications. This substitute is supplied in Bulk packaging format. The extended operating temperature range (-65°C ~ 200°C) provides additional thermal margin. RoHS compliance status is not specified for this part. This substitute is suitable for high-volume applications where Bulk packaging is advantageous.

All three parts share the same base product number (1N4743) and maintain functional compatibility within the specified electrical parameters. Selection between these substitutes should be based on packaging format requirements, inventory availability, and compliance documentation needs for the end application.

Frequently Asked Questions (FAQ)

Q: Can 1N4743A-T50A replace 1N4743AP-TP in my circuit?

A: Yes. Both parts have identical electrical specifications: 13 V zener voltage, ±5% tolerance, 1 W power rating, and 10 Ohms maximum impedance. Both are through-hole axial components in DO-41 packaging. The primary difference is packaging format (Cut Tape versus Tape & Reel).

Q: What is the difference between Tape & Reel, Cut Tape, and Bulk packaging?

A: These are supply formats that affect handling and assembly processes. Tape & Reel (TR) provides components on continuous carrier tape suitable for automated pick-and-place equipment. Cut Tape (CT) provides the same tape format but in shorter lengths. Bulk packaging supplies loose components. All three formats contain electrically identical components in the same DO-41 package.

Q: Does the extended operating temperature range of the substitute parts affect compatibility?

A: No. The substitute parts rated for -65°C ~ 200°C are compatible with applications designed for the main part's -65°C ~ 150°C range. The extended range provides additional thermal margin and does not create incompatibility.

Q: Are all three parts RoHS3 compliant?

A: The 1N4743AP-TP and 1N4743A-T50A are explicitly ROHS3 compliant. The 1N4743ATR RoHS compliance status is not specified in the provided data.

Q: Can I use these parts interchangeably in production?

A: Yes, provided your assembly process accommodates the packaging format. If your equipment is configured for Tape & Reel, use 1N4743AP-TP. If configured for Cut Tape, use 1N4743A-T50A. If using manual assembly or bulk handling, 1N4743ATR is suitable. All three parts are electrically and mechanically identical.

Q: What parameters must match for a zener diode to be considered a true substitute?

A: For the 1N4743 series, the critical matching parameters are: zener voltage (13 V), tolerance (±5%), power rating (1 W), impedance (10 Ohms maximum), reverse leakage current (5 µA @ 9.9 V), mounting type (through-hole), and package style (DO-41 axial). All listed substitutes meet these requirements.

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