1N5261B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5261B-TP is a 47 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The 1N5261B-TP maintains ROHS3 compliance and is suitable for voltage regulation and protection applications requiring a nominal Zener voltage of 47 V with ±5% tolerance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	47	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	105	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 36 V	nA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1N5261B-TP is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Critical):

Nominal Zener voltage: 47 V
Tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance: 105 Ohms
Reverse leakage current: 100 nA @ 36 V
Forward voltage: 1.1 V @ 200 mA

Mechanical Parameters (Critical):

Mounting type: Through Hole
Package designation: DO-35 or DO-204AH (equivalent designations)
Lead configuration: Axial

Compliance Parameters:

RoHS3 compliance required
REACH unaffected status

The 1N5261B-TR meets all specified electrical and mechanical parameters and maintains equivalent compliance certifications, establishing it as a direct substitute for the obsolete 1N5261B-TP.

Parameter Comparison

Parameter	1N5261B-TP (Main Part)	1N5261B-TR (Substitute)	Match Status
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Different Manufacturer
Voltage - Zener (Nom)	47 V	47 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	105 Ohms	105 Ohms	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 36 V	100 nA @ 36 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	Equivalent
Operating Temperature Range	-55°C ~ 150°C	-65°C ~ 175°C	Substitute Exceeds Range
Product Status	Obsolete	Active	Substitute Active
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Grade	—	Automotive	Substitute Enhanced
Qualification	—	AEC-Q101	Substitute Qualified

Engineering Selection Recommendations

The 1N5261B-TR is a direct electrical and mechanical equivalent to the obsolete 1N5261B-TP. Both components share identical nominal Zener voltage, tolerance, power rating, impedance, leakage current, and forward voltage specifications. Both are packaged in DO-35 through-hole configuration with axial leads and maintain ROHS3 and REACH compliance.

The 1N5261B-TR is manufactured by Vishay General Semiconductor - Diodes Division and carries active product status, ensuring ongoing availability and supply chain continuity. The substitute component features an extended operating temperature range (-65°C to 175°C versus -55°C to 150°C) and carries Automotive grade qualification with AEC-Q101 certification, providing enhanced reliability margins for applications requiring extended temperature performance or automotive-grade components.

For applications operating within the original temperature specification of -55°C to 150°C, the 1N5261B-TR provides direct functional replacement without design modification. For applications requiring extended temperature operation or automotive qualification, the 1N5261B-TR offers additional performance headroom.

Frequently Asked Questions (FAQ)

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

A: Yes. The 1N5261B-TR meets all electrical specifications of the 1N5261B-TP, including Zener voltage (47 V), tolerance (±5%), power rating (500 mW), impedance (105 Ohms), leakage current (100 nA @ 36 V), and forward voltage (1.1 V @ 200 mA). Both components use identical DO-35 through-hole packaging with axial leads. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The 1N5261B-TP is classified as obsolete. The 1N5261B-TR is an active product from Vishay General Semiconductor - Diodes Division, ensuring continued availability and supply chain support.

Q: Are there differences in operating temperature ranges?

A: Yes. The 1N5261B-TP operates from -55°C to 150°C, while the 1N5261B-TR operates from -65°C to 175°C. The substitute component provides an extended temperature range, offering additional margin for applications with demanding thermal requirements.

Q: Does the 1N5261B-TR carry any additional certifications?

A: Yes. The 1N5261B-TR is qualified to Automotive grade with AEC-Q101 certification. The 1N5261B-TP does not list automotive qualification. This makes the substitute suitable for automotive applications requiring AEC-Q101 compliance.

Q: Are the packages physically identical?

A: Yes. Both components use DO-35 through-hole packaging (also designated DO-204AH) with axial lead configuration. Physical footprint and PCB layout compatibility are identical.

Q: Do both components meet RoHS and REACH requirements?

A: Yes. Both the 1N5261B-TP and 1N5261B-TR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the inventory status of the substitute part?

A: The 1N5261B-TR has 103,866 pieces in stock as new original inventory, ensuring reliable procurement availability. The 1N5261B-TP has 838 pieces remaining in stock.

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