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Vishay General Semiconductor - Diodes Division BZX84B30-G3-08
- Part No.:
- BZX84B30-G3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B30-G3-08.pdf
- Description:
- DIODE ZENER 30V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
BZX84B30-G3-08 from Vishay Semiconductors is a silicon planar Zener diode with a nominal zener voltage of 30 V, ±2 % tolerance, and 2 mA test current (IZT), designed for precision voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX84B30-G3-08 datasheet, BZX84B30-G3-08 pinout, BZX84B30-G3-08 application, or BZX84B30-G3-08 equivalent, this device offers verified thermal resistance (RthJA = 420 K/W on FR-4), low dynamic impedance (21 Ω at IZT), and AEC-Q101-compatible construction - critical for automotive-grade signal conditioning and industrial sensor biasing.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range (2 mA). Its temperature coefficient of +8 × 10⁻⁴/°C ensures stable reference performance over -55 °C to +150 °C operating temperature.
The SOT-23 package enables surface-mount integration into space-constrained PCBs while maintaining thermal dissipation capability up to 300 mW on FR-4 board. Reverse leakage current is limited to ≤0.05 μA at VR = 22.5 V, supporting high-impedance sensing and low-quiescent-current designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4 V min / 30 V nom / 30.6 V max - enables precise 30 V reference generation with ±2 % accuracy at 2 mA |
| Test Current (IZT) | 2 mA - defines the operating point where VZ and dynamic impedance are guaranteed |
| Dynamic Resistance (ZZ) | 21 Ω at IZT - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 22.5 V - preserves accuracy in high-impedance bias networks |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - supports continuous operation in compact power management circuits |
| Thermal Resistance (RthJA) | 420 K/W - determines junction temperature rise under ambient conditions for reliability modeling |
| Temperature Coefficient (αVZ) | +8 × 10⁻⁴/°C - indicates positive drift, enabling predictable compensation in temperature-critical references |
Pinout & Package
SOT-23 plastic surface-mount package (9.2 mg weight, UL 94 V-0 molding compound, MSL level 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 30 V reference when reverse-biased through current-limiting resistor |
| Collector / Heat Sink (Pin 3) | Internal die attachment pad / thermal path | Electrically connected to cathode; enhances thermal dissipation via PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than standard ±5 % parts, reducing need for post-calibration in precision references |
| ESD robustness (HBM > 8 kV, MM > 800 V) | Supports handling and assembly in non-ESD-controlled environments without additional protection circuitry |
| AEC-Q101 qualification available | Validates suitability for automotive electronics where reliability under thermal cycling and vibration is mandatory |
| Low dynamic impedance (21 Ω) | Maintains voltage stability under varying load currents typical in sensor excitation and ADC reference buffers |
| Wide operating temperature (−55 °C to +150 °C) | Permits deployment in under-hood automotive modules and industrial motor control enclosures |
Applications
| Voltage Reference for Precision ADC | Overvoltage Clamp in Automotive CAN Bus |
|---|---|
Use Scenario: Providing stable 30 V reference to 16-bit SAR ADC in battery monitoring system. IC Role / Device Role / Timing Role: Zener diode acts as primary shunt reference source for ADC's internal reference buffer. Use Value: ±2 % tolerance and +8 × 10⁻⁴/°C TC ensure <0.1 % full-scale error across −40 °C to +125 °C ambient. |
Use Scenario: Clamping transient spikes on CAN_H line during load dump events. IC Role / Device Role / Timing Role: Shunt protection element limiting voltage excursion above 30 V threshold. Use Value: 300 mW power rating and 21 Ω dynamic impedance enable fast clamping response without thermal runaway. |
| Current Source Bias for Op-Amp Input Stage | Regulated Supply for MEMS Sensor Interface |
Use Scenario: Generating constant 2 mA bias current for rail-to-rail op-amp input differential pair. IC Role / Device Role / Timing Role: Zener + series resistor forms simple two-terminal current source. Use Value: Low IR (≤0.05 μA) prevents significant error in current-setting resistor value selection. |
Use Scenario: Delivering clean 30 V supply to piezoresistive pressure sensor bridge. IC Role / Device Role / Timing Role: Post-regulator stage following DC-DC converter output. Use Value: Stable VZ and low ZZ minimize noise coupling into high-gain instrumentation amplifier front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C30-G3-08 | ±5 % tolerance (vs. ±2 %), same VZ nominal, same SOT-23 package | Acceptable where calibration or trimming compensates for wider voltage spread | Select when cost sensitivity outweighs need for tight initial accuracy |
| MMBZ5257B-7-F | 30 V nominal, ±5 %, 3 mA IZT, RthJA = 450 K/W, different marking and tape format | Higher thermal resistance limits power handling in dense layouts | Choose only if existing BOM uses Diodes Inc. footprint and sourcing favors that vendor |
Compared with BZX84B30-G3-08, the BZX84C30-G3-08 trades tighter tolerance for lower unit cost, while MMBZ5257B-7-F introduces higher thermal resistance and looser tolerance - making BZX84B30-G3-08 optimal for uncalibrated, thermally constrained, high-accuracy reference use cases.
Availability
BZX84B30-G3-08 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog I/O cards, and medical patient monitor power supplies requiring stable component supply and long-term lifecycle continuity.
Supply support for BZX84B30-G3-08 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 automotive, industrial, and computing markets.
The BZX84-G Series targets precision voltage regulation in space-constrained, thermally demanding applications - engineered for consistency across temperature, time, and manufacturing lots.
FAQ
What is the exact zener voltage tolerance of BZX84B30-G3-08?
The BZX84B30-G3-08 has a guaranteed zener voltage tolerance of ±2 %, meaning its measured breakdown voltage falls between 29.4 V and 30.6 V when tested at 2 mA (IZT) and 25 °C ambient. This tighter tolerance is indicated by the "B" prefix in the part number, distinguishing it from the ±5 % "C" variant.
Can BZX84B30-G3-08 be used in automotive applications?
Yes - while the standard BZX84B30-G3-08 is commercial grade, Vishay offers AEC-Q101 qualified versions of the BZX84-G Series upon request. The device's −55 °C to +150 °C operating range, >8 kV HBM ESD rating, and SOT-23 robustness make BZX84B30-G3-08 suitable for automotive subsystems where qualification is not mandated.
What is the maximum power dissipation for BZX84B30-G3-08 on a standard FR-4 PCB?
The BZX84B30-G3-08 delivers 300 mW maximum power dissipation when mounted on an FR-4 board using Vishay's recommended soldering footprint. This value assumes proper thermal relief and copper pour design; exceeding it risks junction temperature rise beyond the 150 °C limit, potentially degrading long-term reliability.
How does the temperature coefficient affect BZX84B30-G3-08 performance?
The BZX84B30-G3-08 exhibits a positive temperature coefficient of +8 × 10⁻⁴/°C, meaning its zener voltage increases by approximately 24 mV per 10 °C rise in junction temperature. This behavior must be accounted for in high-precision references, though it remains stable and predictable across the full −55 °C to +150 °C operating range.
Is BZX84B30-G3-08 compatible with lead-free reflow processes?
Yes - the BZX84B30-G3-08 uses a green-compliant SOT-23 package rated for peak reflow temperatures up to 260 °C, fully compliant with IPC/JEDEC J-STD-020 moisture sensitivity level 1 requirements. No pre-baking is required prior to standard lead-free reflow profiles.
BZX84B30-G3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX84-G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B30-G3-08 FAQ
1.How can I place an order for BZX84B30-G3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B30-G3-08 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 BZX84B30-G3-08 reliable?
The price and inventory of BZX84B30-G3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B30-G3-08 is usually 5 days.
3.What payment methods are accepted for BZX84B30-G3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B30-G3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B30-G3-08?
BZX84B30-G3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B30-G3-08 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 BZX84B30-G3-08?
For technical support, including BZX84B30-G3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B30-G3-08 requirements.
6.How does Aetrix verify that BZX84B30-G3-08 is sourced from the original manufacturer or authorized distributors?
All BZX84B30-G3-08 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 BZX84B30-G3-08 meets industry standards.
7.What is the process for return or replacement of BZX84B30-G3-08?
All BZX84B30-G3-08 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B30-G3-08, 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 BZX84B30-G3-08 part is unused and in its original packaging.
Return procedure for BZX84B30-G3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B30-G3-08 Tags
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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