1N4704-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4704-TP is a 17 V, 500 mW Zener diode in DO-35 axial through-hole package manufactured by Micro Commercial Co. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. Substitute parts must maintain electrical performance within the specified tolerance and mechanical compatibility with the original DO-35 package configuration.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	17 V
Tolerance	±5%
Power - Max	500 mW
Current - Reverse Leakage @ Vr	50 nA @ 12.9 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA
Operating Temperature	200°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N4704-TP is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 17 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 axial through-hole configuration
RoHS3 compliance

Substitute Classification:

Direct Equivalent: Parts maintaining identical electrical specifications and tolerance within ±5%, with active product status and equivalent packaging.

Similar Equivalents: Parts with enhanced specifications (tighter tolerance ±2%, automotive qualification AEC-Q101, improved reverse leakage characteristics) that provide superior performance while maintaining core electrical parameters and mechanical compatibility.

All identified substitutes operate at 17 V nominal Zener voltage, 500 mW maximum power, and utilize the DO-35 package. Differences exist in tolerance grades, reverse leakage specifications, forward voltage characteristics, and product qualification levels.

Parameter Comparison

Parameter	1N4704-TP (Main)	1N4704 TR PBFREE	1N5247B-TAP	1N5247B-TR	1N5247C-TAP	1N5247C-TR
Manufacturer	Micro Commercial Co	Central Semiconductor Corp	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - Zener (Nom)	17 V	17 V	17 V	17 V	17 V	17 V
Tolerance	±5%	±5%	±5%	±5%	±2%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Current - Reverse Leakage @ Vr	50 nA @ 12.9 V	50 nA @ 12.9 V	100 nA @ 13 V	100 nA @ 13 V	100 nA @ 13 V	100 nA @ 13 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	200°C (TJ)	-65°C ~ 200°C (TJ)	175°C	175°C	175°C	175°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Packaging Type	Bulk	Tape & Reel (TR)	Tape & Box (TB)	Cut Tape (CT)	Tape & Box (TB)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Standard	Standard	Automotive	Automotive	Automotive	Automotive
Qualification	Not specified	Not specified	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Direct Equivalent Selection:

The 1N4704 TR PBFREE (Central Semiconductor Corp) serves as the primary direct equivalent. This part maintains identical electrical specifications (17 V, ±5% tolerance, 500 mW, 50 nA reverse leakage) and mechanical compatibility. The part is active with ROHS3 compliance and REACH unaffected status. Packaging is supplied as Tape & Reel (TR), suitable for automated assembly processes.

Enhanced Specification Alternatives:

The 1N5247B-TR, 1N5247B-TAP, 1N5247C-TR, and 1N5247C-TAP (Vishay General Semiconductor) provide superior performance characteristics while maintaining core electrical compatibility. These parts feature:

Automotive grade classification with AEC-Q101 qualification
Tighter tolerance specifications (±2% for C-series variants)
Improved reverse leakage characteristics (100 nA @ 13 V)
Enhanced forward voltage performance (1.1 V @ 200 mA)
Active product status with ROHS3 and REACH compliance

The 1N5247B series maintains ±5% tolerance matching the original specification, while the 1N5247C series offers ±2% tolerance for applications requiring tighter voltage regulation. All Vishay variants are qualified to AEC-Q101 automotive standards.

Packaging Considerations:

1N5247B-TR and 1N5247C-TR: Cut Tape (CT) packaging, highest inventory availability (30,655 and 721 units respectively)
1N5247B-TAP and 1N5247C-TAP: Tape & Box (TB) packaging, suitable for manual or semi-automated assembly
1N4704 TR PBFREE: Tape & Reel (TR) packaging, optimized for high-volume automated production

Selection between equivalent parts should be based on procurement volume requirements, assembly process capabilities, and tolerance specifications demanded by the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the 1N4704-TP be directly replaced with the 1N4704 TR PBFREE?

A: Yes. The 1N4704 TR PBFREE maintains identical electrical specifications (17 V nominal, ±5% tolerance, 500 mW power rating) and mechanical compatibility with the original 1N4704-TP. Both utilize the DO-35 axial through-hole package. The primary difference is packaging format (Tape & Reel versus bulk) and active product status of the substitute.

Q: What is the difference between 1N5247B and 1N5247C variants?

A: The primary difference is tolerance specification. The 1N5247B series maintains ±5% tolerance, identical to the original 1N4704-TP. The 1N5247C series provides tighter ±2% tolerance for applications requiring more precise voltage regulation. Both series share identical 17 V nominal voltage, 500 mW power rating, and DO-35 package configuration. Both are AEC-Q101 qualified automotive-grade components.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (1N4704 TR PBFREE, 1N5247B-TR, 1N5247B-TAP, 1N5247C-TR, 1N5247C-TAP) are ROHS3 compliant. The original 1N4704-TP is also ROHS3 compliant.

Q: What packaging options are available for the 1N5247B-TR substitute?

A: The 1N5247B-TR is supplied in Cut Tape (CT) packaging format. This configuration is suitable for both manual component placement and automated pick-and-place assembly systems. Alternative packaging for equivalent 1N5247B specifications is available as 1N5247B-TAP in Tape & Box (TB) format.

Q: Do the Vishay 1N5247 series parts require different PCB footprints compared to the original 1N4704-TP?

A: No. All substitute parts utilize the DO-35 axial through-hole package (DO-204AH designation), maintaining identical mechanical dimensions and PCB footprint compatibility with the original 1N4704-TP.

Q: What is the significance of AEC-Q101 qualification on the 1N5247 series?

A: AEC-Q101 qualification indicates that the 1N5247 series parts meet automotive industry reliability and quality standards established by the Automotive Electronics Council. This qualification is not present on the original 1N4704-TP but provides enhanced reliability assurance for applications requiring automotive-grade components.

Q: Can the 1N5247C-TR with ±2% tolerance be used in applications originally designed for ±5% tolerance parts?

A: Yes. The 1N5247C-TR with ±2% tolerance is a superior specification that provides tighter voltage regulation than the original ±5% specification. Applications designed for ±5% tolerance will operate within specification with ±2% tolerance components. The tighter tolerance may improve circuit performance in voltage regulation applications.

Q: What is the inventory status of substitute parts?

A: Current inventory levels are: 1N4704 TR PBFREE (689 units), 1N5247B-TAP (1,158 units), 1N5247B-TR (30,655 units), 1N5247C-TAP (1,132 units), and 1N5247C-TR (721 units). The 1N5247B-TR maintains the highest inventory availability.

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