1N5271B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5271B-TP is a 100 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical performance across voltage regulation, power dissipation, and thermal operating ranges while meeting equivalent mechanical and packaging specifications.

Substiute Parts

1N5271B-TP

Micro Commercial CoIn Stock: 11321N5271B-TP Datasheet

Current PartRFQ

NTE5050A

NTE Electronics, IncIn Stock: 1498NTE5050A Datasheet

DirectRFQ

1N5271BDO35

Microsemi CorporationIn Stock: 11891N5271BDO35 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1N5271B-TP are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Zener (Nominal): 100 V
• Tolerance: ±5%
• Power - Maximum: 500 mW
• Impedance (Maximum): 500 Ohms
• Mounting Type: Through Hole
• Package / Case: DO-35 (Axial)

Acceptable Variation Parameters:

• Operating Temperature Range: Substitute parts may exceed the original range
• Voltage - Forward (Maximum) @ If: Minor variations acceptable within component class
• Current - Reverse Leakage @ Vr: Variations within specification acceptable

Substitutes are classified as direct or similar based on exact alignment with critical parameters and product availability status.

Parameter Comparison

Engineering Selection Recommendations

1N5271BDO35 (Microsemi Corporation) - Primary Substitute

The 1N5271BDO35 is the preferred substitute for the obsolete 1N5271B-TP. This part maintains identical electrical specifications across all critical parameters: 100 V nominal Zener voltage, ±5% tolerance, 500 mW maximum power, and 500 Ohms maximum impedance. The DO-35 package and through-hole mounting type provide direct mechanical compatibility. The part is currently in active production status with 1152 units in stock. ROHS3 compliance and REACH unaffected status align with the original part's regulatory standing. The extended operating temperature range (-65°C to 175°C) provides enhanced thermal performance compared to the original specification.

NTE5050A (NTE Electronics, Inc) - Secondary Substitute

The NTE5050A qualifies as a direct electrical substitute with matching 100 V nominal Zener voltage, ±5% tolerance, 500 mW maximum power, and 500 Ohms maximum impedance. The DO-35 package and through-hole mounting provide mechanical compatibility. The part is in active production with 1441 units in stock. However, this substitute carries RoHS non-compliant status, which may conflict with regulatory requirements in applications subject to RoHS directives. The extended operating temperature range (-65°C to 200°C) exceeds the original specification. Forward voltage and reverse leakage specifications are not provided for this part.

Selection Criteria:

For applications requiring RoHS3 compliance and regulatory alignment with the original part, select 1N5271BDO35. For applications where RoHS compliance is not a constraint and maximum temperature range is beneficial, NTE5050A is acceptable. Both parts are electrically and mechanically compatible with the original 1N5271B-TP design.

Frequently Asked Questions (FAQ)

Q: Can the NTE5050A be used in place of the 1N5271B-TP without circuit modification?

A: Yes. The NTE5050A maintains identical electrical specifications for Zener voltage (100 V), tolerance (±5%), power rating (500 mW), and impedance (500 Ohms). The DO-35 through-hole package provides direct mechanical compatibility. No circuit modifications are required. However, verify RoHS compliance requirements for your application, as the NTE5050A is RoHS non-compliant.

Q: What is the difference between the 1N5271BDO35 and the original 1N5271B-TP?

A: The 1N5271BDO35 is manufactured by Microsemi Corporation rather than Micro Commercial Co. Electrical specifications are identical across all critical parameters. The primary differences are product status (active vs. obsolete), operating temperature range (-65°C to 175°C vs. -55°C to 150°C), and forward voltage specification (1.5 V vs. 1.1 V @ 200 mA). The 1N5271BDO35 maintains ROHS3 compliance matching the original part.

Q: Are there any thermal performance differences between the substitute parts?

A: The 1N5271BDO35 and NTE5050A both support extended operating temperature ranges beyond the original 1N5271B-TP specification. The 1N5271BDO35 operates from -65°C to 175°C, while the NTE5050A operates from -65°C to 200°C. Both parts are rated for 500 mW maximum power dissipation in the DO-35 package. Thermal performance in specific circuit applications depends on PCB layout and heat dissipation design.

Q: Can these substitute parts be used interchangeably in existing designs?

A: Yes, for the electrical function of voltage regulation at 100 V with 500 mW power dissipation. Both substitute parts maintain the same DO-35 through-hole package and axial lead configuration, enabling direct PCB footprint compatibility. Verify compliance requirements: the 1N5271BDO35 is ROHS3 compliant, while the NTE5050A is RoHS non-compliant.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates that the actual Zener voltage will fall within the range of 95 V to 105 V. All three parts (original and both substitutes) share this tolerance specification, ensuring equivalent voltage regulation performance. This tolerance is critical for applications requiring precise voltage clamping or reference functions.

Q: How do the impedance specifications affect circuit performance?

A: The 500 Ohms maximum impedance specification defines the dynamic resistance of the Zener diode in the breakdown region. All three parts maintain this specification, ensuring equivalent performance in voltage regulation circuits. Lower impedance values indicate better voltage stability across varying load currents.

Q: Are there packaging or supplier differences between the substitute parts?

A: The 1N5271BDO35 is supplied in standard packaging without specified packaging type. The NTE5050A is supplied in bag packaging. Both parts use the DO-35 through-hole package. These packaging differences do not affect electrical performance or PCB compatibility.