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

Vishay General Semiconductor - Diodes Division BZT55C30-GS08

Name: BZT55C30-GS08
Brand: Vishay General Semiconductor - Diodes Division
SKU: BZT55C30-GS08
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZT55C30-GS08

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: SOD-80 Variant

Datasheet:: BZT55C30-GS08.pdf

Description:: DIODE ZENER 30V 500MW SOD80

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Product details

Overview

BZT55C30-GS08 from Vishay Semiconductors is a 30 V nominal Zener diode in QuadroMELF (SOD-80) package, designed for precision voltage regulation and reference applications with ±1.5 V tolerance, 5 mA test current, <0.1 μA reverse leakage at 22 V, 22 Ω dynamic resistance at 5 mA, and +0.04 %/K temperature coefficient at 25 °C.

For engineers reviewing the BZT55C30-GS08 datasheet, BZT55C30-GS08 pinout, BZT55C30-GS08 application, or BZT55C30-GS08 equivalent, this device supports stable low-power voltage clamping, analog reference generation, and overvoltage protection in space-constrained industrial and automotive circuits where tight Zener voltage tolerance and low thermal drift are required.

Technical Context

The BZT55C30-GS08 operates as a single-element, silicon planar Zener diode with sharp reverse breakdown characteristics and low noise. Its 30 V nominal Zener voltage is specified at 5 mA test current (IZT1), with dynamic resistance of 22 Ω measured at 1 kHz and junction-to-ambient thermal resistance of 500 K/W on a standard PCB.

It exhibits a positive temperature coefficient of +0.04 %/K at 25 °C and +0.12 %/K at 150 °C, enabling predictable voltage drift across temperature. The device is rated for 500 mW total power dissipation and operates within a storage temperature range of –65 to +175 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	28–32 V range; provides precise 30 V regulation at 5 mA, suitable for mid-range reference and clamp thresholds
Test Current (I_ZT)	5 mA; defines operating point for nominal V_Z and dynamic resistance specification
Dynamic Resistance (Z_Z)	22 Ω at 5 mA and 1 kHz; ensures minimal output voltage variation under load transients
Reverse Leakage (I_R)	<0.1 μA at 22 V; enables ultra-low standby current in battery-powered or high-impedance bias networks
Temperature Coefficient (T_KVZ)	+0.04 %/K at 25 °C; supports stable reference performance in ambient temperature variations up to 85 °C
Power Dissipation (P_tot)	500 mW; allows continuous operation at ~16.7 mA at 30 V without heatsinking on standard PCB
Package	QuadroMELF (SOD-80); glass-passivated cylindrical surface-mount package with 3.3 mm length and 1.4 mm diameter

Pinout & Package

QuadroMELF (SOD-80) package: hermetically sealed glass body with axial cathode band marking; no discrete pins - anode and cathode are accessed via opposite cylindrical ends. Cathode identified by single black band near one end.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-bias regulation; carries forward current up to 200 mA (V_F ≤ 1.5 V)
Cathode	Zener breakdown terminal	Connected to higher-potential node; sustains stable 30 V reverse breakdown with low dynamic impedance

Key Features

Feature	Design Value
Very sharp reverse characteristic	Enables clean, well-defined breakdown onset-critical for accurate voltage thresholding and low-hysteresis clamping
Low reverse leakage current	<0.1 μA at 22 V ensures negligible error current in high-impedance reference dividers and sensor bias networks
High stability over time and temperature	±1.5 V tolerance and +0.04 %/K TC support long-term accuracy in unregulated supply monitoring and calibration circuits
Low noise operation	Minimizes voltage perturbation in precision analog references and low-noise amplifier biasing
UL 94 V-0 molding compound	Meets flammability safety requirements for industrial control and automotive under-hood modules

Applications

Voltage Reference for ADC/DAC	Overvoltage Clamp in Power Supply Rails
Use Scenario: Providing stable 30 V reference to 12-bit+ analog-to-digital converters in industrial data acquisition systems. IC Role / Device Role / Timing Role: Precision shunt reference source replacing bulkier IC references where board space and cost are constrained. Use Value: Delivers 30 V ±1.5 V tolerance with <0.1 μA leakage-reducing reference divider error and enabling direct connection to high-Z ADC inputs.	Use Scenario: Protecting 24 V DC input rails in programmable logic controllers against transient surges exceeding 30 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting rail voltage during ESD or inductive kick events. Use Value: 22 Ω dynamic resistance and 500 mW rating allow it to absorb short-duration 100–200 mA transients without degradation.
Current Source Biasing	Signal Level Translation
Use Scenario: Generating stable bias current for op-amp input stages or transistor amplifiers in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Constant-current sink using series resistor and BZT55C30-GS08 Zener drop. Use Value: Low 22 Ω Z_Z and +0.04 %/K TC ensure current stability within ±2% over –40 to +85 °C ambient.	Use Scenario: Shifting TTL or CMOS logic levels to 30 V-compatible thresholds in industrial I/O isolation interfaces. IC Role / Device Role / Timing Role: Passive level translator clamping high-side signals to defined 30 V ceiling. Use Value: Sharp reverse knee and low capacitance (<5 pF at 0 V) preserve signal edge integrity up to 10 MHz.

Voltage Reference for ADC/DAC

Overvoltage Clamp in Power Supply Rails

Use Scenario: Providing stable 30 V reference to 12-bit+ analog-to-digital converters in industrial data acquisition systems.

IC Role / Device Role / Timing Role: Precision shunt reference source replacing bulkier IC references where board space and cost are constrained.

Use Value: Delivers 30 V ±1.5 V tolerance with <0.1 μA leakage-reducing reference divider error and enabling direct connection to high-Z ADC inputs.

Use Scenario: Protecting 24 V DC input rails in programmable logic controllers against transient surges exceeding 30 V.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting rail voltage during ESD or inductive kick events.

Use Value: 22 Ω dynamic resistance and 500 mW rating allow it to absorb short-duration 100–200 mA transients without degradation.

Current Source Biasing

Signal Level Translation

Use Scenario: Generating stable bias current for op-amp input stages or transistor amplifiers in sensor signal conditioning circuits.

IC Role / Device Role / Timing Role: Constant-current sink using series resistor and BZT55C30-GS08 Zener drop.

Use Value: Low 22 Ω Z_Z and +0.04 %/K TC ensure current stability within ±2% over –40 to +85 °C ambient.

Use Scenario: Shifting TTL or CMOS logic levels to 30 V-compatible thresholds in industrial I/O isolation interfaces.

IC Role / Device Role / Timing Role: Passive level translator clamping high-side signals to defined 30 V ceiling.

Use Value: Sharp reverse knee and low capacitance (<5 pF at 0 V) preserve signal edge integrity up to 10 MHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4745A	30 V nominal, 1 W rating, DO-41 package (larger footprint, higher P_tot)	Suitable for higher-power clamping but requires PCB real estate and through-hole assembly	Select when >500 mW surge handling is needed and SMT constraints are relaxed
BZX55C30	30 V nominal, 500 mW, DO-35 glass package (axial leaded, not SMT)	Requires manual or wave soldering; incompatible with automated pick-and-place	Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required

Compared with BZT55C30-GS08, the 1N4745A offers higher power handling but lacks SMT compatibility and tighter TC; the BZX55C30 matches voltage and power but introduces assembly complexity and thermal limitations due to leadframe construction.

Availability

BZT55C30-GS08 is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and precision biasing applications requiring stable component supply, consistent parametric performance, and QuadroMELF packaging for high-reliability industrial environments.

Supply support for BZT55C30-GS08 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 markets.

The BZT55-Series targets compact, high-stability Zener regulation in space-constrained SMT applications-designed specifically for precision voltage reference, clamping, and biasing where low leakage, sharp knee, and MSL Level 1 reliability are essential.

FAQ

What is the Zener voltage tolerance of BZT55C30-GS08?

The BZT55C30-GS08 has a Zener voltage range of 28 V (min) to 32 V (max) at 5 mA test current, corresponding to a ±1.5 V absolute tolerance around the 30 V nominal value. This tolerance is guaranteed per Vishay's Rev. 1.8 datasheet (Document Number: 85637) and applies under standard 25 °C ambient conditions. The BZT55C30-GS08 maintains this specification across its qualified operating temperature range.

Does BZT55C30-GS08 support reflow soldering?

Yes, BZT55C30-GS08 is qualified for lead-free reflow soldering at 260 °C for 10 seconds at the terminals, per J-STD-020 MSL Level 1 classification. Its QuadroMELF (SOD-80) package uses UL 94 V-0 compliant molding compound and withstands standard Pb-free reflow profiles without parameter shift or mechanical damage. The BZT55C30-GS08 must be stored dry and used within its moisture sensitivity window to prevent popcorning.

What is the maximum reverse leakage current for BZT55C30-GS08?

The maximum reverse leakage current (I_R) for BZT55C30-GS08 is <0.1 μA at 22 V reverse voltage and 25 °C ambient temperature, as specified in the Vishay BZT55-Series datasheet. This ultra-low leakage enables use in high-impedance reference networks and battery-backed circuits where standby current must remain below 100 nA. The BZT55C30-GS08 maintains sub-microamp leakage up to 150 °C junction temperature.

Can BZT55C30-GS08 replace BZX55C30 in existing designs?

No-BZT55C30-GS08 is not a direct replacement for BZX55C30 due to fundamental package and assembly differences: BZT55C30-GS08 uses QuadroMELF (SOD-80) surface-mount packaging, while BZX55C30 uses axial DO-35 leads. Though both share 30 V Zener voltage and 500 mW rating, the BZT55C30-GS08 requires SMT reflow and different PCB footprint. A redesign is necessary to integrate the BZT55C30-GS08 into a BZX55C30-based layout.

What is the thermal resistance of BZT55C30-GS08 on a standard PCB?

The junction-to-ambient thermal resistance (R_thJA) of BZT55C30-GS08 is 500 K/W when mounted on a standard FR-4 PCB measuring 50 mm × 50 mm × 1.6 mm, per Vishay's Absolute Maximum Ratings table. This value determines safe continuous power derating: at 70 °C ambient, the BZT55C30-GS08 can dissipate up to ~300 mW before reaching its 175 °C max junction temperature. The BZT55C30-GS08 does not require external heatsinking in typical low-duty-cycle applications.

BZT55C30-GS08 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: BZT55

Package/Case:: SOD-80 Variant

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: SOD-80 QuadroMELF

BZT55C30-GS08 FAQ

1.How can I place an order for BZT55C30-GS08 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZT55C30-GS08 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 BZT55C30-GS08 reliable?

The price and inventory of BZT55C30-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT55C30-GS08 is usually 5 days.

3.What payment methods are accepted for BZT55C30-GS08?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT55C30-GS08 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZT55C30-GS08?

BZT55C30-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZT55C30-GS08 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 BZT55C30-GS08?

For technical support, including BZT55C30-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT55C30-GS08 requirements.

6.How does Aetrix verify that BZT55C30-GS08 is sourced from the original manufacturer or authorized distributors?

All BZT55C30-GS08 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 BZT55C30-GS08 meets industry standards.

7.What is the process for return or replacement of BZT55C30-GS08?

All BZT55C30-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with BZT55C30-GS08, 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 BZT55C30-GS08 part is unused and in its original packaging.

Return procedure for BZT55C30-GS08:

1.Submit a request within 90 days.

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

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