1N4686-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4686-TP is a 3.9 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. The 1N4686-TP maintains ROHS3 compliance and is suitable for voltage regulation and protection applications requiring precise 3.9 V reference characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.9	V
Tolerance	±5	%
Power - Maximum	500	mW
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Max) @ If	1.5	V @ 100 mA
Operating Temperature Range	Up to 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 1N4686-TP is determined by electrical and mechanical parameter equivalence. The primary substitution criteria are:

Electrical Parameters:

Zener voltage (Vz) of 3.9 V nominal
Tolerance of ±5%
Maximum power dissipation of 500 mW
Reverse leakage current of 5 µA @ 2 V
Forward voltage of 1.5 V maximum @ 100 mA

Mechanical Parameters:

Through-hole mounting configuration
DO-35 axial package format (DO-204AH designation)

Compliance Parameters:

ROHS3 compliance requirement

The 1N4686 TR PBFREE manufactured by Central Semiconductor Corp satisfies all electrical and mechanical equivalence criteria. This substitute maintains identical zener voltage, tolerance, power rating, and leakage specifications while offering active product status and extended operating temperature range documentation.

Parameter Comparison

Parameter	1N4686-TP (Micro Commercial Co)	1N4686 TR PBFREE (Central Semiconductor Corp)
Voltage - Zener (Nominal)	3.9 V	3.9 V
Tolerance	±5%	±5%
Power - Maximum	500 mW	500 mW
Current - Reverse Leakage @ Vr	5 µA @ 2 V	5 µA @ 2 V
Voltage - Forward (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA
Operating Temperature (TJ)	200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The 1N4686 TR PBFREE is the direct functional equivalent for the obsolete 1N4686-TP. Selection of this substitute is based on:

Electrical Equivalence: All critical electrical parameters—zener voltage, tolerance, power dissipation, reverse leakage, and forward voltage—are identical between the original and substitute part.

Mechanical Compatibility: Both components utilize the DO-35 axial through-hole package, ensuring direct mechanical compatibility in existing PCB layouts and assembly processes.

Compliance Status: The substitute maintains ROHS3 compliance, satisfying regulatory requirements equivalent to the original part. The substitute additionally documents REACH Unaffected status.

Product Availability: The 1N4686 TR PBFREE carries active product status with documented inventory availability, addressing the obsolescence of the original 1N4686-TP.

Packaging Format: The substitute is supplied in Tape & Reel (TR) format, suitable for automated assembly operations. The original part packaging format is not specified in available data.

Operating Temperature Range: The substitute provides documented operating temperature range of -65°C to 200°C, extending the lower temperature specification compared to the original part's maximum rating of 200°C.

Frequently Asked Questions (FAQ)

Q: Can the 1N4686 TR PBFREE directly replace the 1N4686-TP in existing designs?

A: Yes. The 1N4686 TR PBFREE is electrically and mechanically equivalent. All critical parameters—zener voltage, tolerance, power rating, and leakage specifications—are identical. Both components use the DO-35 axial through-hole package, enabling direct substitution in PCB layouts.

Q: What is the difference between the 1N4686-TP and 1N4686 TR PBFREE part numbers?

A: The 1N4686-TP is the original Micro Commercial Co part number, now obsolete. The 1N4686 TR PBFREE is the Central Semiconductor Corp equivalent with active product status. The "TR" designation indicates Tape & Reel packaging format, and "PBFREE" indicates lead-free (RoHS3 compliant) construction. Both parts are electrically identical.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant. The 1N4686 TR PBFREE additionally documents REACH Unaffected status. No compliance barriers exist for substitution.

Q: Does the operating temperature range difference affect substitution suitability?

A: The 1N4686 TR PBFREE specifies -65°C to 200°C operating range, while the 1N4686-TP documentation indicates a maximum of 200°C. For applications operating within the original part's specified temperature envelope, this difference does not affect substitution. For applications requiring sub-zero operation, the substitute provides extended capability.

Q: What packaging format should be selected for new production?

A: The 1N4686 TR PBFREE is supplied in Tape & Reel (TR) format, optimized for automated assembly. This format is standard for production environments. The original part's packaging format is not specified in available documentation.

Q: Are there any secondary substitutes if the 1N4686 TR PBFREE becomes unavailable?

A: The 1N4686 TR PBFREE documentation references 1N5228B (DO-35) as a secondary substitute option. Verification of electrical parameter equivalence is required before implementing secondary substitutes.

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