1N4757G Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4757G is an active-status zener diode manufactured by Taiwan Semiconductor Corporation, rated for 51 V nominal zener voltage with 1 W maximum power dissipation. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in the DO-204AL (DO-41) axial configuration. The device is ROHS3 compliant and REACH unaffected, making it suitable for modern electronic applications requiring voltage regulation or transient protection. Equivalent substitute parts are identified based on matching electrical specifications, mechanical compatibility, and regulatory compliance status.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	51	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 38.8 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4757G is determined by strict equivalence across the following electrical and mechanical parameters:

Zener voltage rating must match at 51 V nominal with ±5% tolerance. Maximum power dissipation must equal 1 W. Impedance specification must not exceed 95 Ohms maximum. Reverse leakage current must be 5 µA at 38.8 V. Forward voltage drop must not exceed 1.2 V at 200 mA forward current. Operating temperature range must span -65°C to 200°C minimum. Mounting configuration must be through-hole type. Package designation must be DO-204AL or DO-41 axial format. Regulatory compliance status (ROHS3 and REACH unaffected) must be maintained.

The 1N4757A TR PBFREE from Central Semiconductor Corp meets all specified electrical parameters and mechanical requirements, differing only in packaging format (Cut Tape versus Tape & Reel) and manufacturer identity.

Parameter Comparison

Parameter	1N4757G (Main Part)	1N4757A TR PBFREE (Substitute)
Manufacturer	Taiwan Semiconductor Corporation	Central Semiconductor Corp
Voltage - Zener (Nom)	51 V	51 V
Tolerance	±5%	±5%
Power - Max	1 W	1 W
Impedance (Max)	95 Ohms	95 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 38.8 V	5 µA @ 38.8 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature Range	-65°C to 200°C	-65°C to 200°C
Mounting Type	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Both the 1N4757G and 1N4757A TR PBFREE are active-status components with identical electrical specifications and regulatory compliance certifications. Selection between these parts is based on packaging and supply chain considerations rather than functional performance.

The 1N4757G is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The 1N4757A TR PBFREE is supplied in Cut Tape (CT) format, appropriate for manual assembly or lower-volume applications. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with modern manufacturing and environmental standards.

Inventory availability differs between suppliers: 1N4757G has 1108 pieces in stock, while 1N4757A TR PBFREE has 5395 pieces available. Component selection should account for production volume requirements and delivery timeline constraints.

Frequently Asked Questions (FAQ)

Q: Can the 1N4757A TR PBFREE directly replace the 1N4757G in circuit applications?

A: Yes. Both components share identical electrical specifications including zener voltage (51 V), power rating (1 W), impedance (95 Ohms maximum), reverse leakage current (5 µA @ 38.8 V), and forward voltage characteristics (1.2 V @ 200 mA). Operating temperature ranges and package types are equivalent. Functional substitution is direct.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging supplies components on continuous tape wound on reels, optimized for high-speed automated pick-and-place assembly. Cut Tape packaging supplies components on tape segments, suitable for manual assembly, small-batch production, or component kits. Both formats contain identical components in DO-41 axial packages.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the 1N4757G and 1N4757A TR PBFREE are ROHS3 compliant and REACH unaffected. Regulatory status is identical, and both components are classified as active products.

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

A: Zener voltage rating, tolerance, maximum power dissipation, impedance specification, reverse leakage current, forward voltage characteristics, operating temperature range, mounting type, and package configuration must all match. Regulatory compliance status must be maintained or improved.

Q: Can I use the 1N4757A TR PBFREE in automated assembly if my equipment requires Tape & Reel format?

A: Cut Tape format is not compatible with standard automated reel-fed pick-and-place equipment. Manual tape feeding or equipment reconfiguration would be required. For automated assembly requiring Tape & Reel format, the 1N4757G is the appropriate selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message