1N4684-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4684-TP is a 3.3 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 equivalent substitute parts for ongoing design requirements and production continuity. Active equivalent parts with identical electrical specifications and compatible packaging are available from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	%
Power - Max	500	mW
Current - Reverse Leakage @ Vr	7.5	µA @ 1.5 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

Substitute parts for the 1N4684-TP are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Zener (Nom): 3.3 V
Power - Max: 500 mW
Tolerance: ±5%
Package / Case: DO-35 (DO-204AH) Axial
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Substitute parts must maintain identical nominal Zener voltage, maximum power dissipation, and tolerance specifications. Package compatibility requires DO-35 axial through-hole configuration. All substitutes must meet ROHS3 compliance requirements. Variations in reverse leakage current, forward voltage characteristics, and operating temperature ranges are acceptable provided the primary electrical specifications are maintained.

Parameter Comparison

Parameter	1N4684-TP (Main)	1N4684 TR PBFREE	BZX55C3V3-TAP
Manufacturer	Micro Commercial Co	Central Semiconductor Corp	Vishay General Semiconductor
Voltage - Zener (Nom)	3.3 V	3.3 V	3.3 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Current - Reverse Leakage @ Vr	7.5 µA @ 1.5 V	7.5 µA @ 1.5 V	2 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA	1.5 V @ 200 mA
Operating Temperature	200°C (TJ)	-65°C ~ 200°C (TJ)	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	-	Tape & Reel (TR)	Cut Tape (CT)

Engineering Selection Recommendations

1N4684 TR PBFREE (Central Semiconductor Corp)

This part is a direct functional equivalent with active product status. It maintains identical electrical specifications including 3.3 V nominal Zener voltage, 500 mW power rating, and ±5% tolerance. The part is ROHS3 compliant and available in Tape & Reel packaging. Operating temperature range extends to -65°C, providing broader thermal coverage than the original part. This substitute is suitable for direct replacement in applications requiring standard through-hole Zener diode functionality.

BZX55C3V3-TAP (Vishay General Semiconductor - Diodes Division)

This part meets all critical electrical specifications with 3.3 V nominal Zener voltage and 500 mW power rating. The BZX55 series is an active product line with AEC-Q101 automotive qualification. Reverse leakage current is lower at 2 µA @ 1 V compared to the original specification. Operating temperature range is -65°C to 175°C. This substitute is appropriate for applications requiring automotive-grade reliability and enhanced performance characteristics. The part is ROHS3 compliant and REACH unaffected.

Both substitutes are electrically and mechanically compatible with the 1N4684-TP and support equivalent circuit functionality.

Frequently Asked Questions (FAQ)

Q: Can 1N4684 TR PBFREE be used as a direct replacement for 1N4684-TP?

A: Yes. Both parts share identical nominal Zener voltage (3.3 V), power rating (500 mW), tolerance (±5%), and DO-35 axial through-hole package configuration. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard). Electrical performance is equivalent.

Q: What is the difference between 1N4684 TR PBFREE and BZX55C3V3-TAP?

A: Both parts meet the core electrical specifications of 3.3 V Zener voltage and 500 mW power rating. BZX55C3V3-TAP features lower reverse leakage current (2 µA @ 1 V vs. 7.5 µA @ 1.5 V), AEC-Q101 automotive qualification, and belongs to an active product series. 1N4684 TR PBFREE provides a closer electrical match to the original part specifications. Selection depends on application requirements for leakage performance and automotive compliance.

Q: Are all substitute parts available in the same package?

A: All substitute parts use the DO-35 (DO-204AH) axial through-hole package, ensuring mechanical compatibility with the original 1N4684-TP. Packaging format differs (Tape & Reel vs. Cut Tape), which affects procurement and handling but not circuit functionality.

Q: Do the substitute parts meet RoHS compliance?

A: Yes. Both 1N4684 TR PBFREE and BZX55C3V3-TAP are ROHS3 compliant, matching the compliance status of the original 1N4684-TP.

Q: What is the operating temperature range for each substitute?

A: 1N4684 TR PBFREE operates from -65°C to 200°C (TJ), matching the upper limit of the original part. BZX55C3V3-TAP operates from -65°C to 175°C (TJ), providing a slightly reduced upper temperature limit. Selection should consider specific application thermal requirements.

Q: Is BZX55C3V3-TAP suitable for automotive applications?

A: Yes. BZX55C3V3-TAP carries AEC-Q101 automotive qualification, making it appropriate for automotive-grade circuit designs. The original 1N4684-TP and 1N4684 TR PBFREE do not carry automotive qualification.

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