1N5347B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5347B is a 10 V, 5 W Zener diode in axial through-hole packaging manufactured by onsemi. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The 1N5347B maintains electrical specifications suitable for voltage regulation and transient protection applications within the specified operating temperature range of -65°C to 200°C.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	10	V
Power - Maximum	5	W
Tolerance	±5	%
Impedance (Maximum)	2	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 7.6 V
Voltage - Forward (Maximum) @ If	1.2	V @ 1 A
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole
Package / Case	T-18, Axial

Substitute Part Grouping Explanation

Substitution of the 1N5347B is determined by electrical parameter equivalence and mechanical compatibility. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - Zener (Nominal): 10 V
Power - Maximum: 5 W
Tolerance: ±5%
Impedance (Maximum): 2 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 7.6 V
Voltage - Forward (Maximum) @ If: 1.2 V @ 1 A

Mechanical Parameters:

Mounting Type: Through Hole
Package / Case: Axial configuration

Substitute parts are classified into two categories:

Direct Equivalent (Same Manufacturer): Parts maintaining identical electrical specifications and axial packaging from the original manufacturer.

Similar Equivalent (Alternative Manufacturer): Parts with identical electrical specifications but potentially different package designations (DO-15 vs. T-18) and operating temperature ranges, requiring mechanical and thermal compatibility verification within the application context.

Parameter Comparison

Parameter	1N5347B (onsemi)	1N5347BG (onsemi)	1N5347B-TP (Micro Commercial Co)
Voltage - Zener (Nominal)	10 V	10 V	10 V
Power - Maximum	5 W	5 W	5 W
Tolerance	±5%	±5%	±5%
Impedance (Maximum)	2 Ohms	2 Ohms	2 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 7.6 V	5 µA @ 7.6 V	5 µA @ 7.6 V
Voltage - Forward (Maximum) @ If	1.2 V @ 1 A	1.2 V @ 1 A	1.2 V @ 1 A
Operating Temperature Range	-65°C to 200°C	-65°C to 200°C	-55°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	T-18, Axial	T-18, Axial	DO-204AC, DO-15, Axial
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1N5347BG (onsemi): This part is the direct equivalent to the 1N5347B, manufactured by the same supplier with identical electrical and mechanical specifications. The 1N5347BG is classified as active product status and is ROHS3 compliant, addressing regulatory requirements. This part is the primary substitute for direct replacement in existing designs.

1N5347B-TP (Micro Commercial Co): This part maintains all critical electrical specifications identical to the 1N5347B. However, the operating temperature range is reduced to -55°C to 150°C compared to the original -65°C to 200°C specification. The package designation is DO-15 rather than T-18, though both are axial through-hole configurations. This part is suitable for applications where the reduced temperature range is acceptable and mechanical fit is verified. The 1N5347B-TP is ROHS3 compliant and active product status.

Selection between 1N5347BG and 1N5347B-TP depends on application thermal requirements and mechanical constraints. The 1N5347BG is recommended as the primary choice due to full temperature range compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 1N5347BG directly replace the 1N5347B in all applications?

A: Yes. The 1N5347BG maintains identical electrical specifications (10 V nominal, 5 W maximum power, ±5% tolerance, 2 Ohms maximum impedance) and mechanical packaging (T-18 axial through-hole). Both components are through-hole mounted with equivalent thermal and electrical performance characteristics.

Q: What is the difference between the 1N5347BG and 1N5347B-TP?

A: The primary differences are: (1) Operating temperature range: 1N5347BG operates -65°C to 200°C while 1N5347B-TP operates -55°C to 150°C; (2) Package designation: 1N5347BG uses T-18 designation while 1N5347B-TP uses DO-15 designation, though both are axial through-hole; (3) Manufacturer: 1N5347BG is onsemi, 1N5347B-TP is Micro Commercial Co. Electrical specifications are identical.

Q: Is the 1N5347B-TP suitable for applications requiring the full -65°C to 200°C temperature range?

A: No. The 1N5347B-TP operating temperature range is -55°C to 150°C, which does not cover the full original specification range. Applications requiring operation below -55°C or above 150°C must use the 1N5347BG.

Q: Are there RoHS compliance differences between substitute parts?

A: Yes. The original 1N5347B is RoHS non-compliant. Both substitute parts, 1N5347BG and 1N5347B-TP, are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.

Q: Can the 1N5347B-TP be used in place of the 1N5347BG?

A: The 1N5347B-TP can be used only if the application operating temperature range does not exceed -55°C to 150°C. All other electrical specifications are equivalent. Mechanical fit must be verified as the DO-15 package may have different lead spacing compared to T-18 axial packaging.

Q: What is the base product number for all these parts?

A: The base product number is 1N5347. The suffixes (B, BG, B-TP) indicate packaging, compliance, and manufacturer variations while maintaining the core 10 V, 5 W Zener diode specifications.

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