1N4103-TP Equivalent & Substitute Parts

Part Overview

The 1N4103-TP is a Zener diode rated at 9.1 V nominal voltage with 500 mW maximum power dissipation in a DO-35 through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited ongoing availability from the original manufacturer, identifying equivalent substitute parts is necessary to maintain design continuity and ensure supply chain reliability for applications requiring 9.1 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 6.92 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N4103-TP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage rating: 9.1 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Package type: DO-35 through-hole axial configuration
Operating temperature range: 175°C maximum junction temperature

Secondary Compatibility Parameters:

Forward voltage drop: 1.1 V maximum at 200 mA
Reverse leakage current characteristics
Dynamic impedance (Zzt)
RoHS3 compliance and MSL rating

The 1N5239B-TR meets all primary substitution criteria and maintains electrical compatibility within the specified tolerance bands. Both components share identical nominal Zener voltage, tolerance, power rating, package configuration, and operating temperature limits.

Parameter Comparison

Parameter	1N4103-TP	1N5239B-TR	Unit
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	-
Product Status	Obsolete	Active	-
Voltage - Zener (Nom)	9.1	9.1	V
Tolerance	±5%	±5%	%
Power - Max	500	500	mW
Impedance (Max)	200	10	Ohms
Current - Reverse Leakage @ Vr	1 @ 6.92 V	3 @ 7 V	µA
Voltage - Forward (Vf) (Max) @ If	1.1 @ 200 mA	1.1 @ 200 mA	V
Operating Temperature	175	175	°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	-
MSL Rating	1 (Unlimited)	1 (Unlimited)	-

Engineering Selection Recommendations

The 1N5239B-TR is a direct functional equivalent to the 1N4103-TP for applications requiring a 9.1 V Zener diode with 500 mW power rating in a DO-35 package. Selection of the 1N5239B-TR is supported by the following factors:

Product Status: The 1N5239B-TR maintains active production status with Vishay General Semiconductor, ensuring ongoing availability and supply chain continuity compared to the obsolete 1N4103-TP.

Electrical Equivalence: Both components share identical nominal Zener voltage (9.1 V), tolerance (±5%), maximum power dissipation (500 mW), forward voltage characteristics (1.1 V @ 200 mA), and operating temperature limits (175°C).

Compliance Certification: Both components are RoHS3 compliant and carry MSL rating 1 (unlimited moisture sensitivity), meeting environmental and reliability standards.

Package Compatibility: Both components utilize the DO-35 through-hole axial package configuration, enabling direct mechanical and electrical substitution in existing circuit board layouts without modification.

Dynamic Impedance Consideration: The 1N5239B-TR exhibits lower maximum dynamic impedance (10 Ohms versus 200 Ohms), which provides improved voltage regulation characteristics and reduced output impedance in Zener regulation applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5239B-TR be used as a direct replacement for the 1N4103-TP?

A: Yes. Both components share identical Zener voltage (9.1 V), tolerance (±5%), power rating (500 mW), forward voltage characteristics, operating temperature limits, and DO-35 package configuration. Direct substitution is electrically and mechanically compatible.

Q: What is the primary reason for substituting the 1N4103-TP?

A: The 1N4103-TP is classified as obsolete. The 1N5239B-TR is an active production component from Vishay General Semiconductor, providing assured long-term availability and supply chain reliability.

Q: Are there any electrical performance differences between these components?

A: The 1N5239B-TR exhibits lower maximum dynamic impedance (10 Ohms compared to 200 Ohms). This characteristic improves voltage regulation performance and reduces output impedance in Zener regulation circuits. Reverse leakage current is slightly higher in the 1N5239B-TR (3 µA @ 7 V versus 1 µA @ 6.92 V), remaining within acceptable limits for most applications.

Q: Do both components meet the same compliance standards?

A: Yes. Both the 1N4103-TP and 1N5239B-TR are RoHS3 compliant with MSL rating 1 (unlimited moisture sensitivity), meeting environmental and reliability requirements.

Q: Is PCB layout modification required when substituting the 1N5239B-TR for the 1N4103-TP?

A: No. Both components use the DO-35 through-hole axial package. Physical dimensions and pin configuration are identical, allowing direct substitution without PCB layout changes.

Q: What is the packaging difference between these components?

A: The 1N4103-TP is supplied in standard packaging, while the 1N5239B-TR is supplied in Cut Tape (CT) packaging. Both components are identical in electrical specifications and physical package configuration (DO-35). Packaging format affects only the delivery and handling method, not component performance or compatibility.

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