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

Vishay General Semiconductor - Diodes Division BZX55C30-TAP

Name: BZX55C30-TAP
Brand: Vishay General Semiconductor - Diodes Division
SKU: BZX55C30-TAP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX55C30-TAP

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BZX55C30-TAP.pdf

Description:: DIODE ZENER 30V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Inventory:71,618

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Product details

Overview

BZX55C30-TAP from Vishay Semiconductors is a silicon planar Zener diode designed for precision voltage regulation and stabilization in low-power circuits. It delivers a nominal Zener voltage of 30 V at 5 mA test current, with ±0.5 V tolerance (28–32 V), 500 mW power dissipation, and 22 Ω dynamic resistance at I_ZT, commonly used in reference supplies and overvoltage protection for microcontroller I/O rails.

For engineers reviewing the BZX55C30-TAP datasheet, BZX55C30-TAP pinout, BZX55C30-TAP application, or BZX55C30-TAP equivalent, key selection criteria include Zener voltage accuracy at 5 mA, temperature coefficient (+0.04 %/K at 25 °C), reverse leakage (<0.1 μA at 23.5 V), DO-35 package compatibility, and thermal resistance (300 K/W).

Technical Context

The BZX55C30-TAP operates as a single-element, two-terminal voltage reference device relying on controlled avalanche breakdown in its doped p-n junction. Its sharp reverse characteristic and low noise support stable DC biasing and analog signal conditioning where minimal voltage drift is critical.

It exhibits a positive temperature coefficient of +0.04 %/K at 25 °C and +0.12 %/K at 150 °C, indicating predictable upward voltage shift with rising junction temperature-enabling compensation-aware designs in thermally varying environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	28–32 V nominal 30 V at 5 mA - defines stable regulation point for reference or clamp circuits
Power Dissipation (P_tot)	500 mW - sets maximum continuous power handling at T_L = 25 °C with 4 mm lead length
Dynamic Resistance (Z_Z)	22 Ω at I_ZT = 5 mA - determines output impedance and load regulation sensitivity
Reverse Leakage Current (I_R)	< 0.1 μA at V_R = 23.5 V - ensures minimal quiescent current in high-impedance bias networks
Temperature Coefficient (T_KVZ)	+0.04 %/K at 25 °C - quantifies voltage drift per degree, critical for temperature-stable references
Junction-to-Ambient Thermal Resistance	300 K/W - governs allowable ambient temperature rise under given power dissipation
Forward Voltage (V_F)	1.5 V max at I_F = 200 mA - relevant for polarity-check or dual-function (Zener + rectifier) circuit reuse

Pinout & Package

DO-35 (DO-204AH) glass axial package, approx. 125 mg weight, UL 94 V-0 molding compound, MSL level 1, compatible with standard reflow profiles up to 260 °C peak.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / cathode-side reference ground	Connected to lower-potential node in Zener configuration; enables reverse-bias operation when cathode is held higher
Cathode	Zener breakdown terminal / voltage reference output	Marked end (band); provides stable 30 V reference when reverse biased above V_Z with current limiting

Key Features

Feature	Design Value
Very sharp reverse characteristic	Enables precise knee detection and tight regulation within ±0.5 V window at 5 mA
Low reverse leakage current	< 0.1 μA at 75 % of V_Z minimizes error in high-resistance divider networks
High stability over time and temperature	Specified T_KVZ and long-term Zener voltage drift < 0.1 % ensure calibration integrity in unattended systems
Low noise performance	Supports use in analog front-ends and sensor excitation where voltage ripple must be sub-mV
DO-35 package with MSL Level 1 rating	Enables standard SMT-compatible handling and reflow without dry-pack or bake requirements

Applications

Industrial Sensor Signal Conditioning	Microcontroller Power Rail Clamp
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Zener diode acting as two-terminal shunt voltage reference, regulating 30 V supply rail feeding op-amp instrumentation amplifiers. Use Value: Maintains ±0.5 V regulation across -40 to +85 °C ambient, ensuring consistent sensor gain and offset calibration without active feedback.	Use Scenario: Protecting 3.3 V GPIO pins against transient overvoltage from relay coil back-EMF in embedded control boards. IC Role / Device Role / Timing Role: Passive clamp element placed between I/O line and 30 V rail, conducting only during >30 V surges to divert energy away from MCU pins. Use Value: Limits clamping voltage to ≤32 V with <0.1 μA leakage, preventing false triggering while preserving signal integrity during normal operation.
Programmable Logic Controller Reference Supply	Legacy Analog Meter Calibration Standard
Use Scenario: Generating a stable 30 V reference for DAC output scaling in modular I/O cards. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed reference potential for 12-bit DAC feedback loop. Use Value: 22 Ω dynamic resistance and +0.04 %/K TC enable <0.1 % full-scale error over industrial temperature range without trimming.	Use Scenario: Serving as field-serviceable voltage standard for calibrating analog panel meters in HVAC control panels. IC Role / Device Role / Timing Role: Portable, battery-powered reference source delivering traceable 30 V output via precision resistor divider. Use Value: Low 0.1 μA leakage and high long-term stability allow multi-year calibration intervals without recalibration drift exceeding meter resolution.

Industrial Sensor Signal Conditioning

Microcontroller Power Rail Clamp

Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules.

IC Role / Device Role / Timing Role: Zener diode acting as two-terminal shunt voltage reference, regulating 30 V supply rail feeding op-amp instrumentation amplifiers.

Use Value: Maintains ±0.5 V regulation across -40 to +85 °C ambient, ensuring consistent sensor gain and offset calibration without active feedback.

Use Scenario: Protecting 3.3 V GPIO pins against transient overvoltage from relay coil back-EMF in embedded control boards.

IC Role / Device Role / Timing Role: Passive clamp element placed between I/O line and 30 V rail, conducting only during >30 V surges to divert energy away from MCU pins.

Use Value: Limits clamping voltage to ≤32 V with <0.1 μA leakage, preventing false triggering while preserving signal integrity during normal operation.

Programmable Logic Controller Reference Supply

Legacy Analog Meter Calibration Standard

Use Scenario: Generating a stable 30 V reference for DAC output scaling in modular I/O cards.

IC Role / Device Role / Timing Role: Shunt regulator establishing fixed reference potential for 12-bit DAC feedback loop.

Use Value: 22 Ω dynamic resistance and +0.04 %/K TC enable <0.1 % full-scale error over industrial temperature range without trimming.

Use Scenario: Serving as field-serviceable voltage standard for calibrating analog panel meters in HVAC control panels.

IC Role / Device Role / Timing Role: Portable, battery-powered reference source delivering traceable 30 V output via precision resistor divider.

Use Value: Low 0.1 μA leakage and high long-term stability allow multi-year calibration intervals without recalibration drift exceeding meter resolution.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4745A	Same 30 V nominal Zener voltage but rated at 1 W P_tot; higher Z_Z (35 Ω) and looser tolerance (±5 %)	Preferred in higher-power clamping where thermal margin is critical; less suitable for precision low-current references	Select BZX55C30-TAP for tighter tolerance (±1.7 %), lower Z_Z, and lower leakage in space-constrained or low-power designs.
BZX85C30	Same 30 V rating but in DO-41 package (larger, 1 W rating); higher Z_Z (30 Ω) and wider V_Z tolerance (28–32 V same, but test current 20 mA)	Used where board-level robustness or manual soldering ease is prioritized over miniaturization	Choose BZX55C30-TAP for DO-35 footprint compatibility, MSL Level 1 handling, and optimized performance at 5 mA bias.

Compared with 1N4745A and BZX85C30, the BZX55C30-TAP offers superior voltage accuracy, lower dynamic impedance, and lower leakage at its specified 5 mA operating point-making it optimal for compact, low-power, precision-regulation roles where DO-35 packaging is required.

Availability

BZX55C30-TAP is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and programmable logic controller reference supplies requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for BZX55C30-TAP 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing applications.

The BZX55-Series is part of Vishay's small-signal Zener diode family engineered for precision voltage stabilization in space-constrained, low-power analog and digital interface circuits.

FAQ

What is the Zener voltage tolerance of BZX55C30-TAP?

The BZX55C30-TAP has a Zener voltage range of 28 V to 32 V at 5 mA test current, corresponding to a nominal 30 V with ±0.5 V absolute tolerance (±1.7 %). This tight tolerance supports accurate voltage referencing in calibration-critical applications without external trimming.

What is the maximum reverse leakage current for BZX55C30-TAP?

The BZX55C30-TAP specifies a maximum reverse leakage current of <0.1 μA at V_R = 23.5 V (75 % of nominal V_Z). This ultra-low leakage ensures minimal loading in high-impedance bias networks and precision divider circuits where current draw must be negligible.

Can BZX55C30-TAP be used in surface-mount assemblies?

The BZX55C30-TAP uses a DO-35 (DO-204AH) axial glass package, which is through-hole mountable. While not an SMT device, it is compatible with automated tape-and-reel (TAP) feeding and can be wave-soldered or hand-soldered. For true SMT alternatives, consider SOD-123 packaged Zeners like BZT52-B30.

What is the thermal resistance of BZX55C30-TAP?

The junction-to-ambient thermal resistance (R_thJA) of BZX55C30-TAP is 300 K/W under standard test conditions (lead length = 4 mm, T_L constant). This value guides thermal design by defining the temperature rise per milliwatt dissipated-e.g., 100 mW yields ~30 °C rise above ambient.

Does BZX55C30-TAP have a specified temperature coefficient?

Yes-the BZX55C30-TAP has a temperature coefficient of +0.04 %/K at 25 °C and +0.12 %/K at 150 °C. This positive coefficient indicates predictable voltage increase with junction temperature, enabling compensation in temperature-sensitive reference designs.

BZX55C30-TAP Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: BZX55

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Cut Tape (CT)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 30 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 22 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

BZX55C30-TAP FAQ

1.How can I place an order for BZX55C30-TAP through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX55C30-TAP 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 BZX55C30-TAP reliable?

The price and inventory of BZX55C30-TAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C30-TAP is usually 5 days.

3.What payment methods are accepted for BZX55C30-TAP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C30-TAP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX55C30-TAP?

BZX55C30-TAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX55C30-TAP 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 BZX55C30-TAP?

For technical support, including BZX55C30-TAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C30-TAP requirements.

6.How does Aetrix verify that BZX55C30-TAP is sourced from the original manufacturer or authorized distributors?

All BZX55C30-TAP 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 BZX55C30-TAP meets industry standards.

7.What is the process for return or replacement of BZX55C30-TAP?

All BZX55C30-TAP units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C30-TAP, 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 BZX55C30-TAP part is unused and in its original packaging.

Return procedure for BZX55C30-TAP:

1.Submit a request within 90 days.

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

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