1N5361B Equivalent & Substitute Parts

Part Overview

The 1N5361B is a 27 V, 5 W Zener diode manufactured by onsemi in a T-18 axial through-hole package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Equivalent and substitute parts are necessary to maintain design continuity and ensure circuit functionality in applications requiring 27 V Zener regulation with 5 W power dissipation capability.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	27 V
Power - Max	5 W
Tolerance	±5%
Impedance (Max)	5 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 20.6 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 1N5361B is determined by the following critical parameters:

Zener Voltage (Vz): All substitute parts must maintain 27 V nominal Zener voltage to preserve circuit regulation characteristics.
Power Rating: All substitutes must support 5 W maximum power dissipation.
Tolerance: The ±5% tolerance of the original part defines the acceptable voltage regulation window. Substitutes with ±5% tolerance are direct equivalents; those with ±10% or ±20% tolerance represent acceptable alternatives with wider voltage variation.
Impedance (Zzt): Maximum impedance of 5 Ohms ensures consistent dynamic response in regulation circuits.
Reverse Leakage Current: 500 nA at the specified reverse voltage maintains acceptable leakage characteristics.
Forward Voltage Drop: 1.2 V @ 1 A ensures predictable forward conduction behavior.
Operating Temperature Range: The original part specifies -65°C ~ 200°C; substitutes with narrower ranges (-65°C ~ 150°C) are acceptable for applications within the reduced range.
Package Type: T-18 axial through-hole package is the standard form factor; DO-15 axial packages are mechanically compatible alternatives.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Vf @ 1A (V)	Temp Range (°C)	Package	Status	RoHS
1N5361B	onsemi	27	±5%	5	5	1.2	-65 ~ 200	T-18, Axial	Obsolete	Non-compliant
1N5361BG	onsemi	27	±5%	5	5	1.2	-65 ~ 200	T-18, Axial	Active	ROHS3 Compliant
1N5361/TR12	Microchip Technology	27	±20%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	Non-compliant
1N5361/TR8	Microchip Technology	27	±20%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	Non-compliant
1N5361A/TR12	Microchip Technology	27	±10%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	Non-compliant
1N5361A/TR8	Microchip Technology	27	±10%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	Non-compliant
1N5361AE3/TR12	Microchip Technology	27	±10%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	ROHS3 Compliant
1N5361AE3/TR8	Microchip Technology	27	±10%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	ROHS3 Compliant
1N5361B	Microsemi Corporation	27	±5%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	Non-compliant
1N5361B-TP	Micro Commercial Co	27	±5%	5	5	1.2	-55 ~ 150	DO-15, Axial	Active	ROHS3 Compliant
1N5361B/TR12	Microchip Technology	27	±5%	5	5	1.2	-65 ~ 150	T-18, Axial	Active	Non-compliant

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

The 1N5361BG manufactured by onsemi is the direct equivalent to the obsolete 1N5361B. This part maintains identical electrical specifications (27 V, ±5% tolerance, 5 W power rating) and operating temperature range (-65°C ~ 200°C). The 1N5361BG is currently in active production status and carries ROHS3 compliance, making it the preferred replacement for new designs and legacy system updates.

Primary Alternatives (Electrical Equivalence with Tolerance Variation):

The 1N5361B/TR12 manufactured by Microchip Technology provides electrical equivalence with ±5% tolerance matching the original part. This part is in active production and suitable for applications where the full -65°C ~ 200°C temperature range is not required; the specified range is -65°C ~ 150°C. The tape and reel packaging (TR12) is appropriate for automated assembly processes.

The 1N5361AE3/TR12 and 1N5361AE3/TR8 manufactured by Microchip Technology offer ±10% tolerance with ROHS3 compliance. These parts are suitable for applications tolerating wider voltage variation and are available in active production status.

Secondary Alternatives (Wider Tolerance):

The 1N5361/TR12 and 1N5361/TR8 manufactured by Microchip Technology provide ±20% tolerance. These parts are acceptable only for applications where voltage regulation tolerance of ±20% is acceptable. The wider tolerance may result in reduced regulation precision compared to the original ±5% specification.

Package Variant:

The 1N5361B-TP manufactured by Micro Commercial Co uses a DO-15 axial package instead of the T-18 package. This part maintains ±5% tolerance and ROHS3 compliance but operates within a reduced temperature range (-55°C ~ 150°C). The DO-15 package is mechanically compatible with T-18 through-hole applications but has different physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5361AE3/TR8 as a direct replacement for 1N5361B?

A: The 1N5361AE3/TR8 is electrically compatible with the 1N5361B for applications where ±10% voltage tolerance is acceptable. Both parts maintain 27 V nominal Zener voltage, 5 W power rating, and 5 Ohm impedance. The primary difference is tolerance specification (±10% versus ±5%) and operating temperature range (-65°C ~ 150°C versus -65°C ~ 200°C). For circuits requiring the original ±5% tolerance or operation above 150°C, the 1N5361BG is the preferred choice.

Q: What is the difference between 1N5361/TR12 and 1N5361B/TR12?

A: The primary difference is tolerance specification. The 1N5361/TR12 carries ±20% tolerance, while the 1N5361B/TR12 carries ±5% tolerance. Both parts maintain identical 27 V Zener voltage and 5 W power rating. The ±20% tolerance part is suitable only for applications where wider voltage variation is acceptable. For precision regulation circuits, the 1N5361B/TR12 is the appropriate selection.

Q: Is the 1N5361B-TP package compatible with T-18 through-hole designs?

A: The 1N5361B-TP uses a DO-15 axial package, which is mechanically compatible with T-18 through-hole PCB layouts. Both are axial through-hole packages with similar lead spacing. However, the DO-15 package has different physical dimensions than the T-18 package. Verification of PCB footprint compatibility is necessary before substitution. Additionally, the 1N5361B-TP operates within -55°C ~ 150°C, which is narrower than the original -65°C ~ 200°C range.

Q: Why is 1N5361BG preferred over other substitutes?

A: The 1N5361BG is manufactured by onsemi, the original manufacturer of the 1N5361B. It maintains identical electrical specifications (27 V, ±5% tolerance, 5 W power, -65°C ~ 200°C operating range) and is in active production status with ROHS3 compliance. This part provides the highest assurance of form, fit, and function compatibility with the original design.

Q: Can I use parts with ±20% tolerance in precision voltage regulation circuits?

A: Parts with ±20% tolerance (such as 1N5361/TR12 and 1N5361/TR8) are not suitable for precision voltage regulation circuits designed for the original ±5% tolerance specification. The ±20% tolerance results in a voltage regulation window of 21.6 V to 32.4 V, compared to 25.65 V to 28.35 V for ±5% tolerance. These parts are acceptable only for applications with relaxed voltage tolerance requirements.

Q: What is the significance of RoHS compliance in substitute selection?

A: RoHS compliance indicates conformance to the Restriction of Hazardous Substances directive. The original 1N5361B is RoHS non-compliant. Substitutes with ROHS3 compliance (1N5361BG, 1N5361AE3/TR12, 1N5361AE3/TR8, 1N5361B-TP) are suitable for new designs and applications subject to RoHS regulations. For legacy systems without RoHS requirements, non-compliant substitutes remain functionally equivalent.

Q: Are there differences in reverse leakage current between substitutes?

A: The reverse leakage current specification is 500 nA at the specified reverse voltage. The original 1N5361B specifies this at 20.6 V, while most Microchip Technology substitutes specify it at 19.4 V. This difference reflects measurement at slightly different reverse voltages but does not affect functional equivalence. Both specifications indicate acceptable leakage characteristics for Zener diode applications.

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