1N751A_S00Z Equivalent & Substitute Parts

Part Overview

The 1N751A_S00Z is a Zener diode rated at 5.1 V nominal with 500 mW power dissipation capacity, manufactured by onsemi in a through-hole DO-35 package. This component is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -65°C to 200°C and maintains ±5% voltage tolerance specifications suitable for voltage regulation and protection applications.

Substiute Parts

1N751A_S00Z

onsemiIn Stock: 10821N751A_S00Z Datasheet

Current PartRFQ

1N5231B_NL

Fairchild SemiconductorIn Stock: 1361801N5231B_NL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N751A_S00Z is determined by strict equivalence across the following critical parameters:

• Zener Voltage (Vz): 5.1 V nominal with ±5% tolerance
• Power Dissipation: 500 mW maximum rating
• Impedance (Zzt): 17 Ohms maximum
• Package Type: DO-35 (DO-204AH) through-hole axial configuration
• Operating Temperature Range: -65°C to 200°C
• Moisture Sensitivity: MSL 1 (Unlimited)

Substitute parts must match all specified electrical parameters and physical package requirements to ensure direct functional replacement without circuit redesign or board layout modification.

Parameter Comparison

Engineering Selection Recommendations

The 1N5231B_NL manufactured by Fairchild Semiconductor is a direct parametric equivalent to the 1N751A_S00Z. Both components share identical nominal Zener voltage, power rating, impedance specification, temperature operating range, and package configuration. The 1N5231B_NL is currently in active production status, providing supply continuity for applications requiring 5.1 V Zener diodes in DO-35 packages.

The 1N5231B_NL carries ROHS3 compliance certification and maintains REACH Unaffected status, consistent with the original part's regulatory classification. Both components are classified under ECCN EAR99 and HTSUS 8541.10.0050.

Selection of the 1N5231B_NL eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs and printed circuit board layouts.

Frequently Asked Questions (FAQ)

Q: Can the 1N5231B_NL be used as a direct replacement for the 1N751A_S00Z without circuit modification?

A: Yes. Both components share identical Zener voltage (5.1 V), power rating (500 mW), impedance (17 Ohms maximum), operating temperature range (-65°C to 200°C), and DO-35 package configuration. No circuit redesign or board layout changes are required.

Q: What is the difference in reverse leakage current between these parts?

A: The 1N751A_S00Z specifies 1 µA maximum at 1 V reverse bias, while the 1N5231B_NL specifies 5 µA maximum at 2 V reverse bias. These measurements are taken at different bias conditions and do not affect functional equivalence for standard voltage regulation applications.

Q: How do the forward voltage characteristics compare?

A: The 1N751A_S00Z specifies 1.5 V maximum forward voltage at 200 mA, while the 1N5231B_NL specifies 1.2 V maximum at the same current. The 1N5231B_NL exhibits lower forward voltage drop, which may provide marginal efficiency improvement in forward-biased applications.

Q: Is the DO-35 package identical between both parts?

A: Yes. Both components use the DO-204AH designation, which is the formal specification for the DO-35 axial through-hole package. Physical dimensions, lead spacing, and mounting characteristics are identical.

Q: Why is the 1N751A_S00Z marked as obsolete?

A: Obsolescence status indicates the part is no longer manufactured by onsemi. The 1N5231B_NL provides an active production alternative with equivalent electrical and mechanical specifications.

Q: Are there any compliance or certification differences?

A: Both parts maintain REACH Unaffected status and EAR99 ECCN classification. The 1N5231B_NL additionally carries ROHS3 compliance certification. Both components have MSL 1 (Unlimited) moisture sensitivity ratings.