1N4732A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4732A-TP is a 4.7 V, 1 W Zener diode manufactured by Micro Commercial Co in a through-hole DO-41G package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part is ROHS3 compliant and REACH unaffected, with 1050 units currently in stock.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	4.7 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max) (Zzt)	8 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N4732A-TP is determined by electrical and mechanical parameter equivalence. The critical parameters for substitution are:

Electrical Parameters:

Zener voltage: 4.7 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Impedance (Max): 8 Ohms
Reverse leakage current: 10 µA @ 1 V
Forward voltage: 1.2 V @ 200 mA

Mechanical Parameters:

Mounting type: Through Hole
Package designation: DO-204AL, DO-41, or Axial equivalent
Operating temperature range: -65°C to 200°C (or compatible subset)

Substitute parts are classified into three categories:

Direct Manufacturer Equivalents: Parts with identical electrical specifications and active product status from different manufacturers.

Parametric Equivalents: Parts meeting all electrical and mechanical requirements with active status and full compliance certifications.

Similar Alternatives: Parts with equivalent electrical performance but minor variations in secondary parameters such as reverse leakage current specifications or operating temperature range.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Package	Status	RoHS
1N4732A-TP	Micro Commercial Co	4.7	±5%	1	8	10 @ 1 V	1.2 @ 200 mA	-65 ~ 200	DO-41G	Obsolete	ROHS3
1N4732A	Microchip Technology	4.7	±5%	1	8	10 @ 1 V	1.2 @ 200 mA	Not specified	DO-41	Active	Not specified
1N4732A,133	NXP USA Inc.	4.7	±5%	1	8	10 @ 1 V	1.2 @ 200 mA	-65 ~ 200	DO-41	Active	Not specified
1N4732A-T50A	onsemi	4.7	±5%	1	8	10 @ 1 V	Not specified	-65 ~ 200	DO-41	Active	ROHS3
1N3825A-1	Microchip Technology	4.7	±5%	1	8	3 @ 2 V	1.2 @ 200 mA	-65 ~ 175	DO-204AL	Active	Non-compliant
1N4732A TR PBFREE	Central Semiconductor Corp	4.7	±5%	1	8	10 @ 1 V	1.2 @ 200 mA	-65 ~ 200	DO-41	Active	ROHS3
1N4732A,113	Nexperia USA Inc.	4.7	±5%	1	8	10 @ 1 V	1.2 @ 200 mA	-65 ~ 200	DO-41	Active	ROHS3
1N4732ATR	onsemi	4.7	±5%	1	8	10 @ 1 V	Not specified	-65 ~ 200	DO-41	Active	ROHS3
1N4732G	Taiwan Semiconductor Corporation	4.7	±5%	1	8	10 @ 1 V	1.2 @ 200 mA	-65 ~ 200	DO-204AL	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The following parts are recommended as primary substitutes due to active product status, complete electrical parameter match, and ROHS3 compliance:

1N4732A,113 (Nexperia USA Inc.) - Active status, ROHS3 compliant, full parameter match including operating temperature range -65°C to 200°C, 10,682 units in stock.
1N4732A TR PBFREE (Central Semiconductor Corp) - Active status, ROHS3 compliant, full parameter match including operating temperature range -65°C to 200°C, 1,059 units in stock.
1N4732ATR (onsemi) - Active status, ROHS3 compliant, full parameter match including operating temperature range -65°C to 200°C, 6,200 units in stock.
1N4732A-T50A (onsemi) - Active status, ROHS3 compliant, operating temperature range -65°C to 200°C, 6,726 units in stock.

Secondary Substitutes (Parametric Equivalents):

1N4732A (Microchip Technology) - Active status, complete electrical parameter match, 20,100 units in stock. Operating temperature range not specified in documentation.
1N4732A,133 (NXP USA Inc.) - Active status, complete electrical parameter match, operating temperature range -65°C to 200°C, 34,722 units in stock.
1N4732G (Taiwan Semiconductor Corporation) - Active status, ROHS3 compliant, full parameter match, DO-204AL package variant, 703 units in stock.

Alternative Substitute (Similar Performance):

1N3825A-1 (Microchip Technology) - Active status, equivalent electrical specifications with lower reverse leakage current (3 µA @ 2 V versus 10 µA @ 1 V), operating temperature range -65°C to 175°C, RoHS non-compliant. This part is suitable only for applications where RoHS compliance is not required and the reduced operating temperature maximum is acceptable.

Frequently Asked Questions (FAQ)

Q: What makes a part a valid substitute for the 1N4732A-TP?

A: A valid substitute must match the following parameters: 4.7 V nominal Zener voltage with ±5% tolerance, 1 W maximum power dissipation, 8 Ohms maximum impedance, 10 µA reverse leakage current at 1 V, 1.2 V forward voltage at 200 mA, through-hole mounting, and DO-41 or DO-204AL package designation. Operating temperature range should be -65°C to 200°C or a compatible subset.

Q: Why is the 1N4732A-TP listed as obsolete?

A: The 1N4732A-TP is classified as obsolete by the original manufacturer, Micro Commercial Co. Multiple active equivalents from other manufacturers are available with identical electrical and mechanical specifications, making transition to alternative sources straightforward.

Q: Can I use 1N4732A,133 as a direct replacement?

A: Yes. The 1N4732A,133 manufactured by NXP USA Inc. is a direct equivalent with identical electrical parameters, active product status, and full operating temperature range compatibility (-65°C to 200°C). It is available in high quantity (34,722 units in stock).

Q: What is the difference between DO-41 and DO-204AL packages?

A: DO-41 and DO-204AL are equivalent package designations for the same through-hole axial diode form factor. Parts specified with either designation are mechanically and electrically interchangeable in circuit applications.

Q: Is the 1N3825A-1 a suitable replacement?

A: The 1N3825A-1 meets the electrical specifications but has two limitations: it is RoHS non-compliant and has a reduced maximum operating temperature of 175°C versus 200°C. It is suitable only for applications where RoHS compliance is not required and the lower temperature maximum is acceptable.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in the following packaging formats: Cut Tape (CT), Tape & Reel (TR), and Bulk. Selection depends on procurement volume and assembly process requirements. All packaging options contain electrically identical components.

Q: Are all substitute parts ROHS3 compliant?

A: Most recommended substitutes are ROHS3 compliant. The 1N3825A-1 is RoHS non-compliant. The 1N4732A and 1N4732A,133 do not specify RoHS status in available documentation. Verify RoHS compliance requirements for your specific application before final part selection.

Q: What is the inventory status of substitute parts?

A: Inventory levels vary by manufacturer and distributor. The highest stock levels are available for 1N4732A,133 (34,722 units), 1N4732A (20,100 units), and 1N4732A-T50A (6,726 units). Confirm current availability with your component supplier.

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