1N4108-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4108-TP is a 14 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, indicating discontinued production and limited availability. Equivalent and substitute parts are necessary to maintain design continuity and ensure project completion when original stock becomes unavailable.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	14 V
Tolerance	±5%
Power - Max	500 mW
Package / Case	DO-204AH, DO-35, Axial
Mounting Type	Through Hole
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 1N4108-TP is determined by matching the following critical electrical and mechanical parameters:

Electrical Parameters:

Zener voltage: 14 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Forward voltage: 1.1 V @ 200 mA
Package classification: DO-35 / DO-204AH axial through-hole

Compliance & Status:

RoHS3 compliance required
MSL rating: 1 (Unlimited)
Active product status preferred due to obsolescence of original part

All substitute parts listed maintain identical electrical specifications and package compatibility with the 1N4108-TP, enabling direct functional replacement in circuit applications.

Parameter Comparison

Parameter	1N4108-TP (Main)	1N5244B TR PBFREE	1N5244B OPAQUE TR	1N5244B-TR
Manufacturer	Micro Commercial Co	Central Semiconductor Corp	Central Semiconductor Corp	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active
Voltage - Zener (Nom)	14 V	14 V	14 V	14 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	200 Ohms	15 Ohms	15 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 10.65 V	100 nA @ 10 V	100 nA @ 10 V	100 nA @ 10 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute Recommendation:

The 1N5244B-TR (Vishay General Semiconductor - Diodes Division) is the preferred substitute for the 1N4108-TP. This part maintains active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for current manufacturing and deployment.

Secondary Substitutes:

The 1N5244B TR PBFREE (Central Semiconductor Corp) and 1N5244B OPAQUE TR (Central Semiconductor Corp) are functionally equivalent alternatives. Both maintain active product status and full compliance certifications. The 1N5244B TR PBFREE variant includes lead-free processing, suitable for applications with enhanced environmental specifications.

Compliance Considerations:

All substitute parts are ROHS3 compliant and carry MSL rating 1 (Unlimited), matching the original part's environmental and handling requirements. The 1N5244B-TR and 1N5244B TR PBFREE include REACH Unaffected status, providing additional regulatory assurance for European and international applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5244B-TR be used as a direct replacement for the 1N4108-TP?

A: Yes. Both parts share identical zener voltage (14 V), tolerance (±5%), power rating (500 mW), forward voltage characteristics (1.1 V @ 200 mA), and DO-35 through-hole package configuration. Electrical and mechanical compatibility is complete.

Q: What is the difference between the impedance values listed for the main part and substitutes?

A: The 1N4108-TP specifies 200 Ohms maximum impedance, while substitute parts specify 15 Ohms maximum impedance. The lower impedance of substitute parts represents improved performance characteristics and does not prevent functional substitution. Lower impedance provides better voltage regulation stability.

Q: Are there packaging differences between the substitute options?

A: All substitute parts use the DO-35 / DO-204AH axial through-hole package, identical to the 1N4108-TP. The 1N5244B TR PBFREE is supplied in Cut Tape (CT) packaging, while 1N5244B OPAQUE TR packaging is not specified. The 1N5244B-TR is supplied in Cut Tape (CT) packaging. These packaging variations do not affect component functionality or circuit compatibility.

Q: Why is the 1N4108-TP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts with active product status ensure continued availability and support for new designs and production runs.

Q: Do all substitute parts meet the same compliance standards as the original part?

A: Yes. All substitute parts are ROHS3 compliant and carry MSL rating 1 (Unlimited), matching the original part's environmental specifications. The 1N5244B-TR and 1N5244B TR PBFREE additionally carry REACH Unaffected status.

Q: What is the difference between 1N5244B TR PBFREE and 1N5244B OPAQUE TR?

A: Both parts are manufactured by Central Semiconductor Corp and share identical electrical specifications. The "PBFREE" designation indicates lead-free processing. Both maintain active product status and full compliance certifications. Selection between these variants depends on specific procurement or environmental requirements.

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