BZX85-B180 Equivalent & Substitute Parts

Part Overview

The BZX85-B180 is a 180 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in a DO-204AL (DO-41) through-hole axial package. This component is classified as obsolete, though 807 pieces remain in stock as new original inventory. The part carries AEC-Q101 automotive qualification and operates across a temperature range of -55°C to 175°C. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	180	V
Tolerance	±5%	—
Power - Maximum	1.3	W
Impedance (Maximum)	1200	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 130 V	—
Voltage - Forward (Maximum) @ If	1 V @ 200 mA	—
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-204AL (DO-41), Axial	—
Mounting Type	Through Hole	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX85-B180 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 180 V nominal
Tolerance: ±5% or tighter
Package / Case: DO-204AL (DO-41) axial through-hole
Mounting type: Through hole

Secondary Compatibility Criteria:

Power dissipation: Equal to or greater than 1.3 W (or acceptable for application if lower)
Operating temperature range: Must encompass or exceed -55°C to 175°C
Impedance: Within acceptable range for circuit function
Reverse leakage current: Within acceptable limits for application

All substitute parts listed maintain the 180 V zener voltage specification and ±5% tolerance (or tighter). All are packaged in DO-204AL (DO-41) axial through-hole format. Substitute parts from Microchip Technology and Microsemi Corporation carry active product status, ensuring long-term availability and supply chain reliability.

Parameter Comparison

Parameter	BZX85-B180 (Main)	1N5955B	1N5955BG	1N5955DG	1N6354
Manufacturer	Vishay	Microchip Technology	Microsemi Corporation	Microsemi Corporation	Microchip Technology
Voltage - Zener (Nom)	180 V	180 V	180 V	180 V	180 V
Tolerance	±5%	±5%	±5%	±1%	±5%
Power - Max	1.3 W	1.25 W	1.25 W	1.25 W	500 mW
Impedance (Max)	1200 Ohms	900 Ohms	900 Ohms	900 Ohms	1500 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 130 V	1 µA @ 136.8 V	1 µA @ 136.8 V	1 µA @ 136.8 V	50 nA @ 137 V
Voltage - Forward (Max) @ If	1 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.4 V @ 1 A
Operating Temperature Range	-55 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Package / Case	DO-204AL (DO-41), Axial	DO-204AL, DO-41, Axial	DO-204AL (DO-41), Axial	DO-204AL (DO-41), Axial	B, Axial
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	Non-compliant	Non-compliant	Non-compliant	Non-compliant

Engineering Selection Recommendations

Primary Substitutes (1N5955B, 1N5955BG, 1N5955DG):

The 1N5955 series from Microchip Technology and Microsemi Corporation are direct functional equivalents to the BZX85-B180. All three variants maintain the 180 V zener voltage, ±5% tolerance (or ±1% for 1N5955DG), and DO-204AL (DO-41) axial through-hole package. Operating temperature ranges extend to -65°C, providing superior low-temperature performance compared to the main part. Power dissipation is rated at 1.25 W, which is marginally lower than the 1.3 W specification of the BZX85-B180 but remains suitable for most applications. All three parts carry active product status, ensuring availability and supply chain continuity.

The 1N5955DG variant offers tighter ±1% tolerance, providing enhanced voltage regulation precision for applications requiring stricter zener voltage control.

Secondary Substitute (1N6354):

The 1N6354 from Microchip Technology maintains the 180 V zener voltage and ±5% tolerance. However, power dissipation is rated at 500 mW, significantly lower than the main part's 1.3 W specification. This part is suitable only for applications where power dissipation requirements do not exceed 500 mW. The 1N6354 is packaged in a B axial format rather than DO-204AL (DO-41), requiring mechanical verification for board layout compatibility. This part carries active product status.

Compliance and Qualification:

All substitute parts maintain RoHS non-compliant status consistent with the main part. The 1N5955 series and 1N6354 do not carry explicit AEC-Q101 automotive qualification in the provided specifications, though they are suitable for general industrial and commercial applications. Applications requiring automotive qualification should verify compliance with specific design requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N5955B directly replace the BZX85-B180 in existing designs?

A: Yes. The 1N5955B maintains identical zener voltage (180 V), tolerance (±5%), and package format (DO-204AL/DO-41 axial through-hole). Operating temperature range extends to -65°C, exceeding the main part's -55°C minimum. Power dissipation is 1.25 W versus 1.3 W; verify that circuit power requirements do not exceed 1.25 W.

Q: What is the difference between 1N5955B, 1N5955BG, and 1N5955DG?

A: All three maintain 180 V zener voltage and DO-204AL (DO-41) packaging. The primary difference is tolerance: 1N5955B and 1N5955BG specify ±5% tolerance, while 1N5955DG specifies ±1% tolerance. The tighter tolerance of 1N5955DG provides enhanced voltage regulation precision. Manufacturers differ: 1N5955B is from Microchip Technology; 1N5955BG and 1N5955DG are from Microsemi Corporation.

Q: Is the 1N6354 a suitable substitute?

A: The 1N6354 maintains 180 V zener voltage and ±5% tolerance but is rated at 500 mW power dissipation, significantly lower than the main part's 1.3 W. Use 1N6354 only in applications where power dissipation does not exceed 500 mW. Package format is B axial rather than DO-204AL (DO-41); verify mechanical compatibility with board layout.

Q: Do substitute parts support automotive applications?

A: The BZX85-B180 carries AEC-Q101 automotive qualification. Substitute parts 1N5955B, 1N5955BG, 1N5955DG, and 1N6354 do not carry explicit AEC-Q101 qualification in provided specifications. For automotive applications requiring AEC-Q101 compliance, verify qualification status with manufacturers or select parts with documented automotive certification.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts (1N5955B, 1N5955BG, 1N5955DG, 1N6354) operate from -65°C to 175°C, extending the low-temperature limit by 10°C compared to the main part's -55°C to 175°C range. This provides improved performance in cold-temperature environments.

Q: Are all substitute parts in active production?

A: Yes. The 1N5955B, 1N5955BG, 1N5955DG, and 1N6354 all carry active product status. The main part BZX85-B180 is obsolete. Active production status ensures long-term availability and supply chain reliability for new designs.

Q: What are the impedance differences between parts?

A: BZX85-B180 specifies 1200 Ohms maximum impedance. The 1N5955 series (all variants) specifies 900 Ohms, providing lower impedance and potentially improved transient response. The 1N6354 specifies 1500 Ohms maximum impedance. Impedance differences may affect circuit performance in high-frequency or high-current applications; verify compatibility with circuit requirements.

Q: Can I use these parts interchangeably on the same PCB?

A: The 1N5955B, 1N5955BG, and 1N5955DG are mechanically and electrically interchangeable on PCBs designed for DO-204AL (DO-41) axial through-hole components. The 1N6354 uses a B axial package format; verify that PCB footprints accommodate this package before substitution.

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