1N5348B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5348B is an 11 V, 5 W axial through-hole zener diode manufactured by onsemi with ±5% voltage tolerance. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. The 1N5348B serves voltage regulation and transient protection applications in electronic circuits requiring stable 11 V reference voltage with 5 W power dissipation capability.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	11 V
Power - Max	5 W
Tolerance	±5%
Impedance (Max) (Zzt)	2.5 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 8.4 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1 A
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	T-18, Axial

Substitute Part Grouping Explanation

Substitution of the 1N5348B is determined by the following critical parameters: nominal zener voltage (11 V), maximum power dissipation (5 W), package type (T-18 axial through-hole), and voltage tolerance. Parts are classified into two categories:

Direct Substitutes maintain identical electrical specifications and package configuration, differing only in manufacturer, product status, or packaging format (bulk versus tape & reel).

Similar Substitutes maintain the core electrical specifications (11 V, 5 W, T-18 axial) but differ in voltage tolerance (±10%, ±20%, or ±2%) or operating temperature range. These parts are functionally compatible where tolerance and temperature requirements permit.

The following parameters determine substitution eligibility:

Voltage - Zener (Nom): 11 V (required)
Power - Max: 5 W (required)
Package / Case: T-18, Axial (required)
Mounting Type: Through Hole (required)
Impedance (Max): 2.5 Ohms (required)
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 1 A (required)

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Product Status	RoHS Status	Packaging
1N5348B	onsemi	11 V	±5%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 200°C	Obsolete	Non-compliant	Axial
1N5348BG	onsemi	11 V	±5%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 200°C	Active	ROHS3 Compliant	Bulk
1N5348B	Microsemi Corporation	11 V	±5%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	T-18
1N5348/TR12	Microchip Technology	11 V	±20%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	Tape & Reel
1N5348/TR8	Microchip Technology	11 V	±20%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	Tape & Reel
1N5348A/TR12	Microchip Technology	11 V	±10%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	Tape & Reel
1N5348A/TR8	Microchip Technology	11 V	±10%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	Tape & Reel
1N5348AE3/TR12	Microchip Technology	11 V	±10%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	ROHS3 Compliant	Tape & Reel
1N5348AE3/TR8	Microchip Technology	11 V	±10%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	ROHS3 Compliant	Tape & Reel
1N5348C/TR12	Microchip Technology	11 V	±2%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	Tape & Reel
1N5348C/TR8	Microchip Technology	11 V	±2%	5 W	2.5 Ω	1.2 V @ 1 A	-65°C ~ 150°C	Active	Non-compliant	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: 1N5348BG (onsemi)

The 1N5348BG is the direct equivalent to the obsolete 1N5348B. Manufactured by onsemi, it maintains identical electrical specifications (11 V, 5 W, ±5% tolerance) and operating temperature range (-65°C ~ 200°C). The 1N5348BG is active in production status and ROHS3 compliant, addressing regulatory requirements for new designs. The only difference is packaging format (bulk versus original specification), which does not affect electrical performance or mechanical compatibility in through-hole applications.

Secondary Recommendation: 1N5348B (Microsemi Corporation)

The Microsemi Corporation 1N5348B provides electrical equivalence with ±5% tolerance and 5 W power rating. This part is active in production. The operating temperature range is reduced to -65°C ~ 150°C compared to the onsemi original specification of -65°C ~ 200°C. This part is suitable for applications not requiring the extended upper temperature limit.

Alternative Options: Microchip Technology 1N5348 Series

Microchip Technology offers multiple variants of the 1N5348 base part number with different tolerance grades and packaging formats (tape & reel). These parts maintain the core 11 V, 5 W specifications and T-18 axial package:

1N5348/TR12 and 1N5348/TR8: ±20% tolerance, active status, suitable for applications with relaxed voltage tolerance requirements
1N5348A/TR12 and 1N5348A/TR8: ±10% tolerance, active status, intermediate tolerance option
1N5348AE3/TR12 and 1N5348AE3/TR8: ±10% tolerance, ROHS3 compliant, active status
1N5348C/TR12 and 1N5348C/TR8: ±2% tolerance, active status, suitable for precision voltage regulation applications

All Microchip variants operate within -65°C ~ 150°C temperature range. Selection among these options depends on application tolerance requirements and regulatory compliance needs.

Frequently Asked Questions (FAQ)

Q: Can the 1N5348B be directly replaced with the 1N5348BG?

A: Yes. The 1N5348BG is electrically and mechanically equivalent to the 1N5348B. Both are manufactured by onsemi with identical voltage (11 V), power (5 W), tolerance (±5%), and operating temperature specifications (-65°C ~ 200°C). The 1N5348BG is active in production and ROHS3 compliant, making it the preferred direct replacement for the obsolete 1N5348B.

Q: What is the difference between the onsemi 1N5348BG and the Microsemi 1N5348B?

A: Both parts share identical electrical specifications (11 V, 5 W, ±5% tolerance) and T-18 axial package. The primary difference is the operating temperature range: onsemi 1N5348BG operates from -65°C ~ 200°C, while Microsemi 1N5348B operates from -65°C ~ 150°C. Applications requiring operation above 150°C must use the onsemi variant.

Q: Can I use a 1N5348A or 1N5348C instead of the 1N5348B?

A: Yes, with tolerance considerations. The 1N5348A series has ±10% tolerance compared to the 1N5348B's ±5%, resulting in a wider voltage variation range. The 1N5348C series has ±2% tolerance, providing tighter voltage regulation. Both maintain the 11 V nominal voltage and 5 W power rating. Selection depends on whether the application circuit can tolerate the different tolerance bands.

Q: What does the "TR8" or "TR12" designation mean in Microchip part numbers?

A: The TR suffix indicates tape & reel packaging format. TR8 and TR12 refer to different reel quantities per packaging unit. Both formats contain identical components; the difference is in the quantity and packaging configuration for automated assembly processes. Electrical specifications remain identical between TR8 and TR12 variants of the same part number.

Q: Are the Microchip 1N5348 variants with ±20% tolerance suitable replacements?

A: The 1N5348/TR12 and 1N5348/TR8 with ±20% tolerance are electrically compatible with the 1N5348B in applications where the wider tolerance band is acceptable. The ±20% tolerance results in a voltage range of 8.8 V to 13.2 V compared to the 1N5348B's 10.45 V to 11.55 V range. Applications requiring tighter voltage regulation should use the ±5%, ±10%, or ±2% tolerance variants.

Q: Is RoHS compliance important for selecting a substitute?

A: RoHS compliance depends on application and regulatory requirements. The 1N5348BG and 1N5348AE3 variants are ROHS3 compliant, suitable for applications subject to RoHS regulations. The original 1N5348B and most other variants are non-compliant. New designs targeting RoHS-regulated markets should prioritize compliant alternatives.

Q: Can I use these zener diodes in applications requiring operation above 150°C?

A: Only the onsemi 1N5348BG supports operation up to 200°C. All Microchip variants and the Microsemi 1N5348B are limited to 150°C maximum operating temperature. Applications requiring extended temperature operation must use the onsemi 1N5348BG.

Q: What is the significance of the impedance (Zzt) parameter?

A: The impedance (Zzt) of 2.5 Ohms is a dynamic impedance specification that affects voltage regulation quality. All listed substitute parts maintain this specification, ensuring equivalent voltage regulation performance. This parameter is critical for transient response and noise filtering applications.

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