Equivalent & Substitute Parts for 1N4125-TP Zener Diode

Part Overview

The 1N4125-TP is a 47 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 axial package configuration. This component is classified as obsolete, indicating discontinued production and limited availability. The part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements where the 1N4125-TP cannot be sourced.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	47	V
Power - Maximum	500	mW
Tolerance	±5%	—
Impedance (Maximum)	250	Ohms
Current - Reverse Leakage @ Vr	10	nA @ 35.75 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature (Maximum)	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1N4125-TP is determined by the following critical parameters that must remain constant across all equivalent parts:

Core Electrical Parameters:

Voltage - Zener (Nominal): 47 V
Power - Maximum: 500 mW
Mounting Type: Through Hole
Package / Case: DO-35 or DO-204AH (Axial)

Acceptable Variation Parameters:

Tolerance: ±5% or tighter (±2%, ±1%)
Impedance (Maximum): 250 Ohms or lower
Current - Reverse Leakage @ Vr: 10 nA or higher
Voltage - Forward (Maximum) @ If: 1.1 V @ 200 mA or lower
Operating Temperature: -65°C to 175°C or equivalent upper limit

All substitute parts listed maintain the core electrical specifications while offering improved or equivalent performance characteristics. Tolerance tightening (from ±5% to ±2% or ±1%) represents enhanced precision without compromising compatibility.

Parameter Comparison

Parameter	1N4125-TP	1N5261B-TR	1N6016B	1N6016C	1N6016D
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Zener (Nom)	47 V	47 V	47 V	47 V	47 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Tolerance	±5%	±5%	±5%	±2%	±1%
Impedance (Max)	250 Ohms	105 Ohms	170 Ohms	170 Ohms	170 Ohms
Current - Reverse Leakage @ Vr	10 nA @ 35.75 V	100 nA @ 36 V	100 nA @ 36 V	100 nA @ 36 V	100 nA @ 36 V
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	175°C (TJ)	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Through Hole	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	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Packaging Type	—	Cut Tape (CT)	Bulk	Bulk	Bulk

Engineering Selection Recommendations

1N5261B-TR (Vishay General Semiconductor)

The 1N5261B-TR is the primary recommended substitute for the 1N4125-TP. This part maintains all core electrical specifications while offering active product status and ROHS3 compliance. The 1N5261B-TR features automotive-grade qualification (AEC-Q101) and lower impedance (105 Ohms versus 250 Ohms), providing superior performance characteristics. Operating temperature range extends to -65°C, exceeding the original part's lower temperature specification. Cut tape packaging supports automated assembly processes.

1N6016D (Microchip Technology)

The 1N6016D provides the tightest tolerance specification at ±1%, suitable for applications requiring enhanced voltage regulation precision. This part maintains active product status with the highest inventory availability (1,184 pieces). Impedance specification of 170 Ohms falls within acceptable parameters. RoHS non-compliance requires evaluation against specific regulatory requirements for the end application.

1N6016C (Microchip Technology)

The 1N6016C offers ±2% tolerance specification, representing a middle-ground precision option between the original ±5% and the ±1% alternative. Active product status and bulk packaging support high-volume production requirements. RoHS non-compliance status applies.

1N6016B (Microchip Technology)

The 1N6016B maintains the original ±5% tolerance specification while providing active product status. This part represents the closest functional equivalent to the 1N4125-TP from Microchip Technology. RoHS non-compliance status applies.

Frequently Asked Questions (FAQ)

Q: Can the 1N5261B-TR directly replace the 1N4125-TP in existing designs?

A: Yes. The 1N5261B-TR maintains identical core electrical specifications (47 V nominal, 500 mW maximum power, ±5% tolerance) and identical package configuration (DO-35 axial through-hole). The lower impedance (105 Ohms versus 250 Ohms) and extended operating temperature range (-65°C to 175°C) represent performance improvements without compatibility issues.

Q: What is the difference between the 1N6016B, 1N6016C, and 1N6016D variants?

A: These three Microchip Technology parts differ only in tolerance specification: 1N6016B at ±5%, 1N6016C at ±2%, and 1N6016D at ±1%. All three maintain identical 47 V nominal voltage, 500 mW power rating, and DO-35 package configuration. Selection depends on voltage regulation precision requirements for the specific application.

Q: Does RoHS compliance status affect substitution compatibility?

A: RoHS compliance status does not affect electrical or mechanical compatibility. However, regulatory requirements for the end application may mandate ROHS3 compliance. The 1N5261B-TR is ROHS3 compliant, while the Microchip 1N6016 series parts are RoHS non-compliant. Verify compliance requirements before final part selection.

Q: Are there packaging differences between substitute parts?

A: The 1N5261B-TR is supplied in cut tape (CT) packaging suitable for automated pick-and-place assembly. The Microchip 1N6016 series parts are supplied in bulk packaging. Both packaging types are compatible with the DO-35 axial through-hole component footprint. Packaging selection depends on assembly process requirements.

Q: What does impedance specification mean for zener diode substitution?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode at specified operating conditions. Lower impedance values indicate better voltage regulation performance and lower output impedance. The 1N4125-TP specifies 250 Ohms maximum impedance. All substitute parts meet or exceed this specification with impedance values of 105 to 170 Ohms, providing equivalent or superior regulation characteristics.

Q: Can the 1N6016 series parts be used interchangeably with each other?

A: Yes, within the constraints of tolerance requirements. All three 1N6016 variants (B, C, D) share identical electrical and mechanical specifications except for tolerance. Applications requiring ±5% tolerance can use any variant. Applications requiring tighter tolerance must use 1N6016C (±2%) or 1N6016D (±1%) accordingly.

Q: What is the significance of the reverse leakage current specification?

A: Reverse leakage current (measured at specified reverse voltage) indicates the quality of the diode junction. The 1N4125-TP specifies 10 nA maximum at 35.75 V. Substitute parts specify 100 nA maximum at 36 V, representing a higher leakage value. This difference is acceptable for most applications and does not affect functional compatibility.

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