1N457A Equivalent & Substitute Parts

Part Overview

The 1N457A is an active general-purpose rectifier diode manufactured by onsemi, rated for 70 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole package. This component is classified as a small-signal diode suitable for general rectification applications. The 1N457A remains in active production status with 5506 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications where the 1N457A specifications are met by alternative manufacturers or package configurations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	70	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V
Current - Reverse Leakage @ Vr	25 nA @ 60 V	nA
Capacitance @ Vr, F	8 pF @ 0V, 1MHz	pF
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction (Max)	175	°C
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Technology	Standard	—

Substitute Part Grouping Explanation

Substitute parts for the 1N457A are classified into two categories based on parametric equivalence:

Parametric Equivalents maintain all critical electrical specifications: 70 V DC reverse voltage rating, 200 mA average rectified current, 25 nA reverse leakage current at 60 V, 8 pF capacitance at 0V/1MHz, and identical through-hole DO-35 package configuration. These parts are direct functional replacements with no circuit redesign required.

Similar Parts share the same current rating (200 mA) and package type (DO-35 through-hole) but differ in reverse voltage rating (60 V instead of 70 V) or other secondary parameters such as reverse leakage current and capacitance. Similar parts are suitable only for applications where the lower voltage specification is acceptable.

The substitution logic is based strictly on the following key parameters:

Voltage - DC Reverse (Vr) (Max)
Current - Average Rectified (Io)
Voltage - Forward (Vf) (Max) @ If
Current - Reverse Leakage @ Vr
Capacitance @ Vr, F
Mounting Type and Package / Case
Operating Temperature - Junction (Max)

Parameter Comparison

Parameter	1N457A (onsemi)	1N457 (Fairchild)	1N457TR (Fairchild)	BAS34-TAP (Vishay)
Manufacturer	onsemi	Fairchild Semiconductor	Fairchild Semiconductor	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	70 V	70 V	70 V	60 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	1 V @ 20 mA	1 V @ 20 mA	1 V @ 100 mA
Current - Reverse Leakage @ Vr	25 nA @ 60 V	25 nA @ 60 V	25 nA @ 60 V	1 nA @ 30 V
Capacitance @ Vr, F	8 pF @ 0V, 1MHz	8 pF @ 0V, 1MHz	8 pF @ 0V, 1MHz	3 pF @ 0V, 1MHz
Speed Classification	Small Signal ≤ 200mA, Any Speed	Small Signal ≤ 200mA, Any Speed	Small Signal ≤ 200mA, Any Speed	Small Signal ≤ 200mA, Any Speed
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Operating Temperature - Junction (Max)	175°C	175°C	175°C	175°C
Product Status	Active	Active	Active	Active
Packaging Type	Bulk	—	Bulk	Cut Tape (CT)
Inventory (Pcs)	5506	10779	30841	79536

Engineering Selection Recommendations

Parametric Equivalent Selection (1N457 and 1N457TR)

The 1N457 (Fairchild Semiconductor) and 1N457TR (Fairchild Semiconductor) are parametric equivalents to the 1N457A. Both parts maintain the 70 V reverse voltage specification, 200 mA current rating, and identical thermal characteristics (175°C maximum junction temperature). The 1N457 and 1N457TR differ only in packaging configuration: 1N457 is supplied in standard packaging while 1N457TR is supplied in bulk packaging, matching the 1N457A bulk configuration. Both Fairchild parts are active products with higher inventory availability (10779 and 30841 units respectively) compared to the 1N457A (5506 units). All three parts are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Similar Part Selection (BAS34-TAP)

The BAS34-TAP (Vishay General Semiconductor - Diodes Division) is classified as a similar part due to a reduced reverse voltage rating of 60 V compared to the 1N457A specification of 70 V. The BAS34-TAP maintains the 200 mA current rating and DO-35 through-hole package configuration. This part exhibits superior reverse leakage characteristics (1 nA @ 30 V versus 25 nA @ 60 V) and lower capacitance (3 pF versus 8 pF). The BAS34-TAP carries automotive qualification (AEC-Q101) and is available in significantly higher inventory (79536 units). Selection of BAS34-TAP is appropriate only for applications where the circuit design accommodates a 60 V maximum reverse voltage specification.

Frequently Asked Questions (FAQ)

Q: Can the 1N457 (Fairchild) be used as a direct replacement for the 1N457A (onsemi)?

A: Yes. The 1N457 is a parametric equivalent with identical electrical specifications: 70 V reverse voltage, 200 mA current rating, 25 nA reverse leakage, and 8 pF capacitance. Both parts use the DO-35 through-hole package and operate to 175°C maximum junction temperature. No circuit modification is required.

Q: What is the difference between 1N457 and 1N457TR?

A: The 1N457 and 1N457TR are electrically identical parametric equivalents. The primary difference is packaging: 1N457TR is supplied in bulk packaging, while 1N457 is supplied in standard packaging. Both are manufactured by Fairchild Semiconductor and maintain all electrical specifications of the 1N457A.

Q: Can BAS34-TAP replace the 1N457A in all applications?

A: No. The BAS34-TAP has a maximum reverse voltage rating of 60 V, compared to the 1N457A specification of 70 V. BAS34-TAP is suitable only for applications where the circuit design operates at or below 60 V reverse voltage. Applications requiring the full 70 V rating must use parametric equivalents (1N457 or 1N457TR).

Q: Are all substitute parts RoHS compliant?

A: The 1N457A, 1N457, and 1N457TR are ROHS3 compliant. The BAS34-TAP is also ROHS3 compliant. All parts are REACH unaffected. Compliance documentation should be verified with the specific supplier for the intended application.

Q: What is the difference in forward voltage characteristics between these parts?

A: The 1N457A and BAS34-TAP specify forward voltage at 100 mA (1 V @ 100 mA), while the 1N457 and 1N457TR specify forward voltage at 20 mA (1 V @ 20 mA). These measurements are taken at different current levels and reflect manufacturer test conditions rather than functional differences at the 200 mA operating point.

Q: Does the BAS34-TAP automotive qualification (AEC-Q101) affect substitution decisions?

A: AEC-Q101 qualification indicates the BAS34-TAP meets automotive industry reliability standards. This qualification does not prevent use in non-automotive applications. However, the 60 V reverse voltage limitation remains the primary constraint for substitution decisions.

Q: Are there package compatibility considerations between these parts?

A: All substitute parts use the DO-35 through-hole axial package (DO-204AH designation). Physical dimensions and lead spacing are identical, ensuring direct mechanical compatibility on printed circuit boards. Packaging format differences (bulk versus cut tape) affect only procurement and handling, not circuit performance.

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