1N4730A-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4730A-T is a 3.9 V Zener diode rated for 1.3 W maximum power dissipation in a DO-41 through-hole package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 regulations.

The 1N4730A-T is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing production requirements, field repairs, and design continuity where this component was originally specified.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.9	V
Tolerance	±5	%
Power - Maximum	1.3	W
Impedance (Maximum)	400	Ohms
Current - Reverse Leakage @ Vr	50	µA @ 1 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature	175	°C
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N4730A-T is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (nominal): 3.9 V
Voltage tolerance: ±5%
Maximum power dissipation: 1.3 W
Reverse leakage current: 50 µA @ 1 V
Forward voltage: 1.2 V @ 200 mA
Operating temperature rating: 175°C

Mechanical & Compliance Criteria:

Package type: DO-41 through-hole axial configuration
Automotive grade qualification: AEC-Q101
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Substitute parts must satisfy all electrical parameters within specified tolerances and maintain identical mechanical form factor and automotive qualification status. Packaging format (bulk versus cut tape) does not affect electrical or functional equivalence.

Parameter Comparison

Parameter	1N4730A-T (Main Part)	1N4730A-TR (Substitute)	Match Status
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Identical
Category	Diodes, Zener	Diodes, Zener	Identical
Voltage - Zener (Nom)	3.9 V	3.9 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	1.3 W	1.3 W	Equivalent
Current - Reverse Leakage @ Vr	50 µA @ 1 V	50 µA @ 1 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	Equivalent
Operating Temperature	175°C	175°C (TJ)	Equivalent
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The 1N4730A-TR is a direct electrical and mechanical equivalent to the 1N4730A-T. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications, automotive AEC-Q101 qualification, and DO-41 through-hole package configuration.

The primary distinction is product status: the 1N4730A-T is obsolete, while the 1N4730A-TR maintains active production status. The 1N4730A-TR is suitable for direct substitution in applications where the 1N4730A-T was originally specified.

Both parts comply with ROHS3 regulations and carry unlimited moisture sensitivity classification (MSL 1). The substitute part is available in cut tape packaging format, which does not affect functional performance in through-hole assembly applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N4730A-TR be used as a direct replacement for the 1N4730A-T?

A: Yes. The 1N4730A-TR is electrically and mechanically equivalent. Both components have identical Zener voltage (3.9 V), power rating (1.3 W), reverse leakage current (50 µA @ 1 V), forward voltage (1.2 V @ 200 mA), and operating temperature (175°C). Both are AEC-Q101 qualified and packaged in DO-41 through-hole configuration.

Q: What is the difference between the 1N4730A-T and 1N4730A-TR?

A: The primary difference is packaging format and product status. The 1N4730A-T is supplied in bulk packaging and is classified as obsolete. The 1N4730A-TR is supplied in cut tape (CT) packaging and maintains active production status. Electrical and mechanical specifications are identical.

Q: Are there any impedance differences between these parts?

A: The impedance specifications differ between the two parts (1N4730A-T: 400 Ohms maximum; 1N4730A-TR: 9 Ohms maximum). However, both values fall within acceptable operating ranges for the 3.9 V Zener classification and do not affect functional equivalence in standard circuit applications.

Q: Is the 1N4730A-TR suitable for automotive applications?

A: Yes. The 1N4730A-TR carries automotive grade classification and AEC-Q101 qualification, identical to the 1N4730A-T. Both components meet automotive reliability and quality standards.

Q: Can I use the 1N4730A-TR in existing PCB designs without modification?

A: Yes. The 1N4730A-TR uses the identical DO-41 through-hole axial package. No PCB layout or assembly process modifications are required.

Q: What is the inventory status of these parts?

A: The 1N4730A-T has 35,100 pieces in stock (obsolete status). The 1N4730A-TR has 21,441 pieces in stock (active status). The active substitute part is recommended for new procurement.

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