1N4681-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4681-TP is a 2.4 V, 500 mW Zener diode in DO-35 axial package manufactured by Micro Commercial Co. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts maintain the core electrical specifications while offering active product status and improved availability from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.4	V
Power - Max	500	mW
Tolerance	±5%	-
Package / Case	DO-204AH, DO-35, Axial	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N4681-TP is determined by the following core electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 2.4 V
Power - Max: 500 mW
Package / Case: DO-204AH (DO-35), Axial
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Tolerance: ±5% or tighter (±2%)
Current - Reverse Leakage @ Vr: 2 µA to 100 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If: 1.1 V to 1.5 V
Operating Temperature: -65°C to 200°C (TJ)

All substitute parts listed maintain the primary substitution criteria. Variations in secondary parameters reflect different manufacturer designs and performance grades, including automotive-qualified options with AEC-Q101 certification.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Package	Product Status	RoHS
1N4681-TP	Micro Commercial Co	2.4	500	±5%	DO-35	Obsolete	ROHS3
1N4681 TR PBFREE	Central Semiconductor Corp	2.4	500	±5%	DO-35	Active	ROHS3
1N5221B-TAP	Vishay General Semiconductor	2.4	500	±5%	DO-35	Active	ROHS3
1N5221B-TR	Vishay General Semiconductor	2.4	500	±5%	DO-35	Active	ROHS3
1N5221C-TAP	Vishay General Semiconductor	2.4	500	±2%	DO-35	Active	ROHS3
1N5221C-TR	Vishay General Semiconductor	2.4	500	±2%	DO-35	Active	ROHS3
BZX55B2V4-TAP	Vishay General Semiconductor	2.4	500	±2%	DO-35	Active	ROHS3
BZX55B2V4-TR	Vishay General Semiconductor	2.4	500	±2%	DO-35	Active	ROHS3
BZX55C2V4-TAP	Vishay General Semiconductor	2.4	500	±5%	DO-35	Active	ROHS3
BZX55C2V4-TR	Vishay General Semiconductor	2.4	500	±5%	DO-35	Active	ROHS3
TZX2V4A-TAP	Vishay General Semiconductor	2.4	500	-	DO-35	Active	ROHS3

Engineering Selection Recommendations

Direct Replacement (Active Status, Matching Specifications):

The 1N4681 TR PBFREE from Central Semiconductor Corp provides the most direct replacement for the obsolete 1N4681-TP. This part maintains identical electrical specifications (2.4 V, 500 mW, ±5% tolerance) and packaging (DO-35), with active product status and ROHS3 compliance.

Automotive-Qualified Alternatives:

For applications requiring automotive-grade components with AEC-Q101 qualification, the following parts are suitable:

1N5221B-TAP and 1N5221B-TR (Vishay, ±5% tolerance)
1N5221C-TAP and 1N5221C-TR (Vishay, ±2% tolerance, tighter specification)
BZX55B2V4-TAP and BZX55B2V4-TR (Vishay, ±2% tolerance)
BZX55C2V4-TAP and BZX55C2V4-TR (Vishay, ±5% tolerance)

All automotive-qualified options carry AEC-Q101 certification and extended operating temperature ranges (-65°C to 175°C).

Packaging Considerations:

Substitute parts are available in multiple packaging formats:

Cut Tape (CT): 1N5221B-TAP, 1N5221C-TAP, BZX55B2V4-TAP, BZX55C2V4-TAP, TZX2V4A-TAP
Tape & Reel (TR): 1N4681 TR PBFREE, 1N5221B-TR, 1N5221C-TR, BZX55B2V4-TR, BZX55C2V4-TR

Selection between packaging formats depends on production volume and assembly requirements.

Performance Grade Selection:

±5% Tolerance: 1N4681 TR PBFREE, 1N5221B series, BZX55C2V4 series
±2% Tolerance: 1N5221C series, BZX55B2V4 series (tighter voltage specification)
Unspecified Tolerance: TZX2V4A-TAP (Vishay TZX series)

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 1N4681-TP?

A: Yes. All listed substitute parts maintain the core electrical specifications (2.4 V nominal Zener voltage, 500 mW power rating) and identical DO-35 axial package. The 1N4681 TR PBFREE from Central Semiconductor Corp is the closest functional equivalent with matching ±5% tolerance.

Q: What is the difference between the 1N5221 and BZX55 series?

A: Both series provide 2.4 V, 500 mW Zener diodes in DO-35 packages. The 1N5221 series features lower impedance (30 Ohms maximum) and lower reverse leakage current (100 µA @ 1 V). The BZX55 series has higher impedance (85 Ohms maximum) and lower reverse leakage current (50 µA @ 1 V). Both are automotive-qualified with AEC-Q101 certification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the original 1N4681-TP specification.

Q: What does the tolerance specification mean for Zener diodes?

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 2.4 V specification. ±5% tolerance allows 2.28 V to 2.52 V, while ±2% tolerance allows 2.352 V to 2.448 V. Tighter tolerance (±2%) is suitable for applications requiring more precise voltage regulation.

Q: Can I use the TZX2V4A-TAP without a specified tolerance?

A: The TZX2V4A-TAP is a Vishay TZX series component with active product status and automotive qualification. The absence of a specified tolerance in the provided data does not indicate incompatibility; however, tolerance information should be obtained from the manufacturer datasheet for applications with strict voltage regulation requirements.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual tape strips suitable for lower-volume production and manual assembly. Tape & Reel packaging is supplied on continuous reels for automated pick-and-place assembly equipment. Both formats contain identical components; selection depends on production volume and assembly process.

Q: Are automotive-qualified parts necessary for my application?

A: Automotive-qualified parts (AEC-Q101 certified) are required for automotive applications and applications subject to automotive industry standards. For general industrial or consumer applications, non-automotive-qualified parts are acceptable. All substitute parts listed include automotive-qualified options.

Q: What is the operating temperature range for these Zener diodes?

A: The original 1N4681-TP specifies 200°C maximum junction temperature. Substitute parts vary: Central Semiconductor 1N4681 TR PBFREE operates -65°C to 200°C; Vishay 1N5221 and BZX55 series operate -65°C to 175°C; Vishay TZX2V4A-TAP operates -65°C to 175°C. Selection depends on application temperature requirements.

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