Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Vishay General Semiconductor - Diodes Division BZX85-B180

Name: BZX85-B180
Brand: Vishay General Semiconductor - Diodes Division
SKU: BZX85-B180
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BZX85-B180

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: BZX85-B180.pdf

Description:: DIODE ZENER 180V 1.3W DO204AL

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,405

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BZX85-B180 from Vishay is a silicon planar power Zener diode designed for voltage stabilization and clipping circuits requiring ±2 % tolerance and 1.3 W power dissipation in DO-41 glass package. It delivers a nominal Zener voltage of 180 V (176–184 V range), with dynamic resistance ≤1200 Ω at 1.5 mA test current, and exhibits a temperature coefficient of +0.055 %/°C.

For engineers reviewing the BZX85-B180 datasheet, BZX85-B180 pinout, BZX85-B180 application, or BZX85-B180 equivalent, this device is selected for high-voltage reference stability, transient overvoltage clamping in industrial power supplies, and precision DC rail regulation where tight voltage tolerance and thermal robustness are critical.

Technical Context

The BZX85-B180 operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals under specified current conditions. Its silicon planar construction ensures reproducible Zener characteristics and low leakage (<0.5 µA at 130 V).

Thermal performance is defined by a junction-to-ambient thermal resistance of 130 °C/W (with leads held at ambient at 10 mm from case), enabling operation up to 175 °C junction temperature. The device requires minimum 1.5 mA Zener test current for specification compliance and supports admissible Zener current up to 130 mA at 25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	176–184 V at I_ZT = 1.5 mA - defines precise regulation window for high-voltage reference design
Power Dissipation (P_tot)	1.3 W - maximum continuous power handling at T_amb = 25 °C with proper lead thermal management
Dynamic Resistance (r_ZT)	≤1200 Ω at I_ZT = 1.5 mA - determines output impedance and load regulation sensitivity
Temperature Coefficient (αV_Z)	+0.055 %/°C - quantifies voltage drift per degree Celsius rise, critical for thermal stability in wide-temp environments
Reverse Leakage Current	<0.5 µA at V_R = 130 V - ensures minimal standby power loss and high off-state impedance
Junction Temperature (T_j)	175 °C - maximum allowable semiconductor junction temperature under sustained operation
Package	DO-41 glass case - industry-standard axial leaded package with 310 mg mass and cathode band marking

Pinout & Package

DO-41 glass axial package with cathode identified by a painted band near one lead end. Leads are tinned copper-clad steel; case diameter 2.6 mm max, length 4.1 mm max, lead length ≥26 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / reference ground node	Connected to lower-potential side of circuit; forms return path during Zener conduction
Cathode	Reverse-biased Zener terminal / regulated output node	Connected to higher-potential rail; maintains stable voltage relative to anode when reverse biased above V_Z

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables tighter regulation than E24-grade C-series variants, reducing need for post-regulation trimming
1.3 W power rating	Supports higher energy clamping in surge protection circuits without external heat sinking
Low reverse leakage (<0.5 µA)	Minimizes quiescent current draw in battery-backed or low-power monitoring circuits
+0.055 %/°C tempco	Provides predictable, positive drift behavior-enables compensation in multi-diode reference strings
DO-41 glass mechanical standard	Ensures compatibility with legacy through-hole assembly processes and automated tape-and-reel feeding

Applications

Industrial Power Supply Regulation	High-Voltage Reference Generator
Use Scenario: Stabilizing 180 V DC bus in switch-mode power supply feedback loop or auxiliary bias rail. IC Role / Device Role / Timing Role: Zener diode acting as primary voltage reference for error amplifier input or overvoltage detection threshold. Use Value: Maintains regulation within ±2 % across temperature and load, enabling reliable feedback control without trimming resistors.	Use Scenario: Generating precise 180 V reference for analog-to-digital converter calibration or high-voltage sensor excitation. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing stable potential against which other signals are measured. Use Value: Delivers <0.5 µA leakage and +0.055 %/°C drift, minimizing measurement offset and thermal error in precision systems.
Transient Voltage Clamping	Overvoltage Protection Circuit
Use Scenario: Absorbing inductive kickback spikes on relay coils or solenoid drivers operating near 180 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting peak voltage to 184 V to protect downstream MOSFETs or controllers. Use Value: Withstands 130 mA peak Zener current and 1.3 W pulse power, enabling robust transient suppression without derating.	Use Scenario: Safeguarding input stage of industrial PLC modules exposed to 200 V surges on 180 V supply lines. IC Role / Device Role / Timing Role: Primary overvoltage limiter placed before linear regulator or microcontroller power input. Use Value: Glass DO-41 package offers high insulation resistance and arc resistance, preventing flashover during repeated 130 V transients.

Industrial Power Supply Regulation

High-Voltage Reference Generator

Use Scenario: Stabilizing 180 V DC bus in switch-mode power supply feedback loop or auxiliary bias rail.

IC Role / Device Role / Timing Role: Zener diode acting as primary voltage reference for error amplifier input or overvoltage detection threshold.

Use Value: Maintains regulation within ±2 % across temperature and load, enabling reliable feedback control without trimming resistors.

Use Scenario: Generating precise 180 V reference for analog-to-digital converter calibration or high-voltage sensor excitation.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing stable potential against which other signals are measured.

Use Value: Delivers <0.5 µA leakage and +0.055 %/°C drift, minimizing measurement offset and thermal error in precision systems.

Transient Voltage Clamping

Overvoltage Protection Circuit

Use Scenario: Absorbing inductive kickback spikes on relay coils or solenoid drivers operating near 180 V.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting peak voltage to 184 V to protect downstream MOSFETs or controllers.

Use Value: Withstands 130 mA peak Zener current and 1.3 W pulse power, enabling robust transient suppression without derating.

Use Scenario: Safeguarding input stage of industrial PLC modules exposed to 200 V surges on 180 V supply lines.

IC Role / Device Role / Timing Role: Primary overvoltage limiter placed before linear regulator or microcontroller power input.

Use Value: Glass DO-41 package offers high insulation resistance and arc resistance, preventing flashover during repeated 130 V transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX85-C180	±5 % tolerance (168–191 V), same DO-41 package and 1.3 W rating	Lower cost but wider regulation spread; suitable where absolute voltage accuracy is secondary to cost	Select BZX85-C180 only if system tolerances allow ±5 % variation and thermal drift compensation is not required.
1N4749A	180 V nominal, ±5 %, 1 W rating, DO-41, r_ZT ≤1200 Ω at 7.5 mA	Lower power rating and higher test current reduce suitability for low-current reference use	Choose 1N4749A only for general-purpose clamping where 1 W dissipation suffices and 7.5 mA bias is acceptable.

Compared with BZX85-B180, the BZX85-C180 trades tighter tolerance for broader availability and lower unit cost, while the 1N4749A offers similar voltage but reduced power headroom and less favorable low-current regulation-making BZX85-B180 optimal for precision 180 V references demanding ±2 % and 1.3 W capability.

Availability

BZX85-B180 is available at Aetrix Electronics and suitable for industrial power supply regulation, high-voltage reference generation, and transient voltage clamping requiring stable component supply and traceable sourcing.

Supply support for BZX85-B180 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Semiconductor GmbH is a global manufacturer of discrete semiconductors and passive components, headquartered in Germany and serving industrial, automotive, and computing markets since 1962.

The BZX85 series was engineered specifically for high-reliability voltage stabilization and clipping in power electronics, emphasizing tight tolerance, thermal stability, and rugged DO-41 packaging for long-term field operation.

FAQ

What is the Zener voltage tolerance of the BZX85-B180?

The BZX85-B180 has a guaranteed Zener voltage range of 176 V to 184 V at I_ZT = 1.5 mA, corresponding to ±2 % tolerance per the B-suffix designation. This tighter tolerance enables more accurate voltage references compared to the ±5 % C-series variants like BZX85-C180, and is confirmed in the Vishay BZX85-Series datasheet revision 1.7.

What is the maximum power dissipation for the BZX85-B180?

The BZX85-B180 has a maximum power dissipation (P_tot) of 1.3 W at T_amb = 25 °C, provided leads are maintained at ambient temperature at a distance of 10 mm from the DO-41 glass case. Derating is required above 25 °C ambient, following the curve in Figure 5 of the official Vishay datasheet.

Does the BZX85-B180 have a specified temperature coefficient?

Yes, the BZX85-B180 has a temperature coefficient of +0.055 %/°C at I_Z = I_ZT, meaning its Zener voltage increases by approximately 99 mV per °C rise in junction temperature. This value is documented in the Electrical Characteristics table for the BZX85B180 variant in the Vishay BZX85-Series datasheet.

What is the reverse leakage current specification for the BZX85-B180?

The BZX85-B180 specifies a maximum reverse leakage current of <0.5 µA at V_R = 130 V, measured at T_amb = 25 °C. This low leakage supports energy-efficient designs in always-on monitoring circuits and minimizes loading effects on high-impedance reference nodes.

Is the BZX85-B180 compatible with automated assembly processes?

Yes, the BZX85-B180 uses the JEDEC DO-41 axial package with standardized dimensions (max 4.1 mm length, 2.6 mm diameter) and is supplied in 5 k/reel tape-and-reel (TR) or ammo pack (TAP) formats. Its tinned leads and consistent mechanical profile ensure compatibility with standard pick-and-place and wave soldering equipment.

BZX85-B180 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: BZX85

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 180 V

Tolerance:: ±5%

Power - Max:: 1.3 W

Impedance (Max) (Zzt):: 1200 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 130 V

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 200 mA

Operating Temperature:: -55°C ~ 175°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

BZX85-B180 FAQ

1.How can I place an order for BZX85-B180 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX85-B180 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZX85-B180 reliable?

The price and inventory of BZX85-B180 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85-B180 is usually 5 days.

3.What payment methods are accepted for BZX85-B180?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85-B180 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX85-B180?

BZX85-B180 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX85-B180 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZX85-B180?

For technical support, including BZX85-B180 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85-B180 requirements.

6.How does Aetrix verify that BZX85-B180 is sourced from the original manufacturer or authorized distributors?

All BZX85-B180 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX85-B180 meets industry standards.

7.What is the process for return or replacement of BZX85-B180?

All BZX85-B180 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85-B180, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZX85-B180 part is unused and in its original packaging.

Return procedure for BZX85-B180:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …