1N5263B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5263B-TP is a 56 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 axial package configuration. This component is classified as obsolete, though 1009 units remain in stock. The part functions as a voltage regulator and protective device in electronic circuits requiring 56 V reference or clamping applications.

Due to the obsolete product status of the 1N5263B-TP, equivalent substitute parts are necessary for new designs, long-term availability assurance, and procurement continuity. Substitute parts must maintain the same nominal Zener voltage (56 V) and tolerance (±5%) while accommodating different power ratings, package types, and thermal operating ranges based on application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	56	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	150	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 43 V	nA
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	-
Package / Case	DO-35	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the 1N5263B-TP are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - Zener (Nom): 56 V (exact match required)
Tolerance: ±5% (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Criteria:

Power - Max: Substitutes may equal or exceed the original 500 mW rating
Impedance (Max): Lower impedance values indicate improved voltage regulation characteristics
Operating Temperature Range: Substitutes must support the application's thermal requirements
Package / Case: DO-35, DO-41, and T-18 packages are all axial through-hole configurations with different physical dimensions and power dissipation capabilities
RoHS and REACH Compliance: Substitutes must maintain regulatory compliance status

The three identified substitute parts (1N5370B, 1N5263B-1, and 1N4758A-T50A) all maintain the 56 V nominal Zener voltage and ±5% tolerance, ensuring voltage regulation equivalence. Differences in power rating, package type, and thermal characteristics allow selection based on specific circuit requirements.

Parameter Comparison

Parameter	1N5263B-TP (Main)	1N5263B-1	1N4758A-T50A	1N5370B
Manufacturer	Micro Commercial Co	Microchip Technology	onsemi	Microsemi Corporation
Voltage - Zener (Nom)	56 V	56 V	56 V	56 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	1 W	5 W
Impedance (Max)	150 Ohms	150 Ohms	110 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 43 V	100 nA @ 43 V	5 µA @ 42.6 V	500 nA @ 40.3 V
Operating Temperature Range	-55 to 150°C	-65 to 175°C	-65 to 200°C	-65 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-35	DO-35	DO-41	T-18
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

1N5263B-1 (Microchip Technology)

This substitute provides direct electrical equivalence to the 1N5263B-TP with identical power rating (500 mW), impedance (150 Ohms), and reverse leakage characteristics (100 nA @ 43 V). The part maintains DO-35 package compatibility, enabling direct physical replacement in existing PCB layouts. Product status is Active, ensuring long-term availability. Operating temperature range extends to 175°C, providing enhanced thermal margin. This substitute is the optimal choice for applications requiring form-fit-function compatibility with the original part.

1N4758A-T50A (onsemi)

This substitute increases power dissipation capability to 1 W while maintaining 56 V nominal voltage and ±5% tolerance. The DO-41 package is larger than DO-35, requiring PCB layout modification. Impedance improves to 110 Ohms, providing superior voltage regulation. Operating temperature range extends to 200°C. Product status is Active with ROHS3 compliance. This substitute is suitable for applications requiring higher power handling or extended thermal operating range, where PCB layout changes are acceptable.

1N5370B (Microsemi Corporation)

This substitute provides the highest power rating (5 W) among available substitutes, with significantly improved impedance (35 Ohms) for superior voltage regulation. The T-18 package is substantially larger than DO-35, requiring significant PCB layout modification. Product status is Active. However, RoHS non-compliance status must be evaluated against application regulatory requirements. This substitute is appropriate for high-power applications where thermal dissipation and voltage regulation performance are critical design parameters.

Frequently Asked Questions (FAQ)

Q: Can the 1N5263B-1 be used as a direct replacement for the 1N5263B-TP?

A: Yes. The 1N5263B-1 maintains identical electrical specifications (56 V, 500 mW, ±5%, 150 Ohms impedance) and package type (DO-35). Physical and electrical substitution is direct without circuit modification.

Q: What is the primary difference between the 1N4758A-T50A and the original 1N5263B-TP?

A: The 1N4758A-T50A doubles the power rating from 500 mW to 1 W and improves impedance from 150 Ohms to 110 Ohms. The package changes from DO-35 to DO-41, requiring PCB layout modification. Nominal voltage and tolerance remain identical at 56 V and ±5%.

Q: When should the 1N5370B be selected over other substitutes?

A: The 1N5370B is selected for applications requiring power dissipation exceeding 1 W or where superior voltage regulation (35 Ohms impedance) is critical. The 5 W power rating and improved impedance characteristics justify the larger T-18 package and associated PCB layout changes. RoHS compliance status must be verified for the target application.

Q: Are all substitute parts RoHS compliant?

A: The 1N5263B-1 and 1N4758A-T50A are ROHS3 compliant. The 1N5370B is RoHS non-compliant. Application regulatory requirements determine acceptable substitute selection.

Q: What is the impact of package type differences on circuit design?

A: DO-35 (original) is the smallest package with lowest power dissipation capability. DO-41 (1N4758A-T50A) is intermediate in size. T-18 (1N5370B) is the largest package with highest power dissipation. Package selection affects PCB layout, thermal management, and physical space requirements. Smaller packages require careful thermal design for high-power applications.

Q: Can substitutes be used interchangeably in the same circuit?

A: Substitutes with identical power ratings and impedance (1N5263B-1) enable direct interchangeability. Substitutes with higher power ratings (1N4758A-T50A, 1N5370B) are compatible but may alter circuit thermal characteristics and require package-specific PCB layout considerations. Voltage regulation performance improves with lower impedance values.

Q: What is the significance of impedance differences among substitutes?

A: Impedance affects voltage regulation quality under load changes. Lower impedance (1N5370B at 35 Ohms) provides superior voltage stability compared to higher impedance (1N5263B-TP at 150 Ohms). Applications requiring tight voltage regulation benefit from lower impedance substitutes.

Q: How do operating temperature ranges affect substitute selection?

A: The original 1N5263B-TP operates from -55°C to 150°C. Substitutes extend this range: 1N5263B-1 to 175°C, 1N4758A-T50A to 200°C. Applications in extreme thermal environments benefit from extended temperature range substitutes. Verify application requirements before selecting based on temperature range alone.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message