1N4703-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4703-TP is a 16 V, 500 mW Zener diode in DO-35 axial through-hole packaging manufactured by Micro Commercial Co. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. Substitute parts must maintain electrical performance across voltage regulation, power dissipation, and leakage characteristics while accommodating packaging and compliance requirements.

Substiute Parts

1N4703-TP

Micro Commercial CoIn Stock: 12051N4703-TP Datasheet

Current PartRFQ

1N4703 TR PBFREE

Central Semiconductor CorpIn Stock: 11941N4703 TR PBFREE Datasheet

DirectRFQ

1N5246C-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 10811N5246C-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Zener (Nominal): 16 V (exact match required)
• Power - Maximum: 500 mW (exact match required)
• Mounting Type: Through Hole (required for form factor compatibility)
• Package / Case: DO-35 or DO-204AH (mechanical and thermal compatibility)

Compliance Criteria:

• RoHS3 Compliance (mandatory for regulatory alignment)
• Product Status: Active preferred (ensures ongoing availability)

Acceptable Variations:

• Tolerance: ±2% to ±5% (tighter tolerance acceptable)
• Current - Reverse Leakage: Values at or below specified threshold acceptable
• Voltage - Forward (Vf): Values at or below specified threshold acceptable
• Operating Temperature: Maximum rating at or above 200°C acceptable
• Packaging Format: Tape & Reel (TR) acceptable for through-hole axial components

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

1N4703 TR PBFREE (Central Semiconductor Corp)

This part is a direct electrical equivalent with identical voltage, power, tolerance, and leakage specifications. Product status is Active, ensuring long-term availability. Packaging is Tape & Reel format, suitable for automated assembly processes. RoHS3 compliance and REACH Unaffected status confirm regulatory alignment. Operating temperature range extends to 200°C, matching the main part requirement. This substitute is the primary choice for direct replacement in production environments.

1N5246C-TR (Vishay General Semiconductor - Diodes Division)

This part meets core electrical requirements with 16 V nominal voltage and 500 mW power rating. Tolerance is tighter at ±2%, providing improved voltage regulation precision. Product status is Active with AEC-Q101 automotive qualification, indicating enhanced reliability screening. Operating temperature maximum is 175°C, which is below the main part specification of 200°C; this represents a thermal derating and must be evaluated against application requirements. Forward voltage is lower (1.1 V @ 200 mA), indicating improved efficiency characteristics. RoHS3 compliance and REACH Unaffected status confirm regulatory alignment. This substitute is suitable for applications where tighter voltage tolerance and automotive-grade reliability are beneficial, provided thermal operating conditions remain within 175°C.

Frequently Asked Questions (FAQ)

Q: Can 1N4703 TR PBFREE be used as a direct replacement for 1N4703-TP?

A: Yes. Both parts share identical electrical specifications: 16 V nominal voltage, 500 mW power rating, ±5% tolerance, and 50 nA reverse leakage. The primary difference is packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete). Electrical performance and thermal characteristics are equivalent.

Q: What is the significance of the ±2% tolerance on 1N5246C-TR compared to ±5% on the main part?

A: Tighter tolerance (±2%) means the Zener voltage will remain closer to the nominal 16 V across the specified operating range. This provides improved voltage regulation precision. Applications requiring strict voltage control benefit from this characteristic. Applications with wider voltage tolerance requirements are unaffected by this difference.

Q: Why is the operating temperature maximum for 1N5246C-TR listed as 175°C instead of 200°C?

A: The 1N5246C-TR has a lower maximum junction temperature rating of 175°C compared to the 1N4703-TP specification of 200°C. This represents a thermal derating of 25°C. Applications operating near or above 175°C must use 1N4703 TR PBFREE or verify that thermal conditions remain within the 175°C limit for 1N5246C-TR.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both 1N4703 TR PBFREE and 1N5246C-TR are ROHS3 Compliant, matching the main part specification. This ensures regulatory compliance for applications subject to RoHS directives.

Q: What is the difference between DO-35 and DO-204AH packaging?

A: DO-35 and DO-204AH are equivalent designations for the same axial through-hole diode package. Both refer to a cylindrical component with axial leads. Mechanical and thermal characteristics are identical. These designations are interchangeable for component selection purposes.

Q: Can 1N5246C-TR be used in high-temperature applications above 175°C?

A: No. The 1N5246C-TR maximum junction temperature is 175°C. Applications requiring operation at 176°C or higher must use 1N4703 TR PBFREE, which is rated to 200°C. Exceeding the maximum junction temperature rating degrades component reliability and performance.

Q: What does AEC-Q101 qualification on 1N5246C-TR indicate?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. This certification indicates the component has undergone enhanced reliability testing and screening specific to automotive applications. Components with AEC-Q101 qualification are suitable for automotive and high-reliability applications requiring proven quality standards.

Q: Is Tape & Reel packaging compatible with manual assembly?

A: Tape & Reel packaging is optimized for automated pick-and-place assembly. Manual assembly is possible but less efficient. If manual assembly is required, bulk packaging may be preferable. Both 1N4703 TR PBFREE and 1N5246C-TR are available in Tape & Reel format and are compatible with standard automated assembly equipment.