1N4105-TP Equivalent & Substitute Parts

Part Overview

The 1N4105-TP is a Zener diode rated at 11 V nominal voltage with 500 mW power dissipation, packaged in a DO-35 through-hole configuration. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is necessary for ongoing design support, production continuity, and long-term component sourcing strategies.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 8.44 V	nA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	V
Operating Temperature	175	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1N4105-TP is determined by strict equivalence across the following critical parameters:

Zener Voltage (Vz): 11 V nominal with ±5% tolerance
Power Dissipation: 500 mW maximum
Package Type: DO-35 through-hole axial configuration
Forward Voltage: 1.1 V maximum at 200 mA
Operating Temperature: 175°C maximum junction temperature
RoHS Compliance: ROHS3 Compliant status

The 1N5241B-TR meets all critical electrical and mechanical parameters required for direct substitution. Both components share identical zener voltage, power rating, tolerance, forward voltage characteristics, operating temperature range, and package configuration. The substitute part is manufactured by Vishay General Semiconductor - Diodes Division and maintains active product status with significantly higher inventory availability.

Parameter Comparison

Parameter	1N4105-TP	1N5241B-TR	Match
Voltage - Zener (Nom)	11 V	11 V	✓
Tolerance	±5%	±5%	✓
Power - Max	500 mW	500 mW	✓
Impedance (Max)	200 Ohms	22 Ohms	Enhanced
Current - Reverse Leakage @ Vr	50 nA @ 8.44 V	2 µA @ 8.4 V	Differs
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	✓
Operating Temperature	175°C	175°C	✓
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	✓
Mounting Type	Through Hole	Through Hole	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Product Status	Obsolete	Active	Improved

Engineering Selection Recommendations

The 1N5241B-TR is a direct functional equivalent to the 1N4105-TP for applications requiring an 11 V, 500 mW Zener diode in DO-35 through-hole packaging. Selection of the 1N5241B-TR provides the following advantages:

Product Status: The 1N5241B-TR maintains active product status with 66,049 units in stock, compared to the obsolete 1N4105-TP with 1,060 units. This ensures long-term component availability and supply chain continuity.

Compliance and Certification: Both components are ROHS3 compliant. The 1N5241B-TR carries AEC-Q101 automotive qualification and REACH unaffected status, providing additional regulatory assurance for applications requiring automotive-grade or regulated supply chain documentation.

Electrical Performance: The 1N5241B-TR exhibits superior impedance characteristics (22 Ohms versus 200 Ohms maximum), resulting in improved voltage regulation stability. All other critical electrical parameters—zener voltage, power dissipation, forward voltage, and operating temperature—are identical.

Packaging and Mounting: Both components use identical DO-35 axial through-hole packaging, enabling direct mechanical and electrical substitution without circuit board redesign or rework.

Frequently Asked Questions (FAQ)

Q: Can the 1N5241B-TR be used as a direct replacement for the 1N4105-TP?

A: Yes. Both components share identical zener voltage (11 V), power rating (500 mW), tolerance (±5%), forward voltage (1.1 V @ 200 mA), operating temperature (175°C), and DO-35 through-hole package configuration. Direct substitution is electrically and mechanically compatible.

Q: What is the difference in impedance between these parts?

A: The 1N4105-TP has a maximum impedance of 200 Ohms, while the 1N5241B-TR has a maximum impedance of 22 Ohms. Lower impedance in the 1N5241B-TR provides improved voltage regulation and reduced output impedance, which is beneficial for applications requiring stable reference voltage performance.

Q: Are there differences in reverse leakage current?

A: Yes. The 1N4105-TP specifies 50 nA reverse leakage at 8.44 V, while the 1N5241B-TR specifies 2 µA at 8.4 V. The 1N4105-TP exhibits lower reverse leakage. For applications where reverse leakage is a critical design parameter, this difference should be evaluated against circuit requirements.

Q: Why is the 1N5241B-TR recommended over the 1N4105-TP?

A: The 1N5241B-TR is recommended due to active product status, significantly higher inventory availability (66,049 units versus 1,060 units), AEC-Q101 automotive qualification, and superior impedance characteristics. The 1N4105-TP is classified as obsolete, creating long-term sourcing risk.

Q: Can these components be used interchangeably in existing designs?

A: Yes. The identical electrical ratings, tolerance, forward voltage, operating temperature, and DO-35 package configuration enable direct interchangeability. No circuit modifications or board rework are required.

Q: What packaging format is the 1N5241B-TR supplied in?

A: The 1N5241B-TR is supplied in Cut Tape (CT) packaging, while the 1N4105-TP packaging format is not specified in available data. Both components use the same DO-35 through-hole package configuration for circuit board mounting.

Q: Are both components RoHS compliant?

A: Yes. Both the 1N4105-TP and 1N5241B-TR are ROHS3 compliant. The 1N5241B-TR additionally carries REACH unaffected status.

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