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Vishay General Semiconductor - Diodes Division BZX84B30-E3-08
- Part No.:
- BZX84B30-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B30-E3-08.pdf
- Description:
- DIODE ZENER 30V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,576
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Product details
Overview
BZX84B30-E3-08 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-E3-08 datasheet, BZX84B30-E3-08 pinout, BZX84B30-E3-08 application, or BZX84B30-E3-08 equivalent, this device offers verified thermal resistance (RthJA = 420 K/W on FR-4), low dynamic resistance (21 Ω at IZT), and AEC-Q101 qualification readiness via HE3_A variant-critical for automotive sensor biasing and industrial control references.
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.
Constructed in SOT-23 package with UL 94 V-0 molding compound and MSL level 1 moisture sensitivity, it supports lead-free reflow up to 260 °C peak and delivers 300 mW power dissipation on FR-4 board-enabling compact, high-reliability placement in space-constrained PCB layouts.
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 within ±2 % tolerance for feedback and clamping. |
| Test Current (IZT) | 2 mA - defines the operating point where VZ and dynamic resistance are guaranteed; matches low-current biasing needs. |
| Dynamic Resistance (ZZ) | 21 Ω at IZT - ensures minimal voltage deviation under small-signal load variations, critical for stable reference accuracy. |
| Reverse Leakage (IR) | 0.05 μA at VR = 22.5 V - guarantees negligible quiescent current draw in standby or high-impedance sensing nodes. |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - supports continuous operation in ambient temperatures up to +125 °C without derating. |
| Temperature Coefficient (αVZ) | +8 × 10⁻⁴/°C - provides predictable, positive drift for compensation-aware designs in wide-temperature environments. |
| Junction Temperature (Tj) | 150 °C maximum - allows reliable operation in under-hood automotive or industrial enclosure applications. |
Pinout & Package
SOT-23 surface-mount package: 3-terminal plastic case with standard pin assignment (anode, cathode, anode) - identical footprint to industry-standard SOT-23 discrete diodes and transistors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation; must be routed with low-inductance path for stability. |
| 2 | Cathode | Connected to regulated output or reference node; carries full Zener current; requires adequate copper pour for thermal relief. |
| 3 | Anode | Internally tied to Pin 1 - dual-anode configuration confirms single-diode topology with common-anode layout. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants (e.g., BZX84C30), reducing need for external trimming in precision references. |
| ESD robustness: >8 kV HBM | Eliminates need for additional ESD protection in front-end sensor interfaces or exposed I/O lines. |
| AEC-Q101 qualified variant available | Supports drop-in replacement with BZX84B30-HE3_A-08 for automotive-grade designs requiring stress-tested reliability. |
| MSL level 1 rating | Permits unlimited floor life and standard reflow without baking-reducing manufacturing overhead in high-mix production. |
| RoHS-compliant (E3 suffix) | Meets global environmental compliance requirements without sacrificing electrical performance or thermal capability. |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable 30 V bias to Hall-effect or pressure sensor ICs in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end conditioning circuitry. Use Value: Maintains sensor linearity and offset stability across -40 °C to +125 °C ambient, leveraging +8 × 10⁻⁴/°C TC matching. |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener clamp defining reference threshold for TL431-type shunt regulator interface. Use Value: Delivers 21 Ω dynamic impedance to minimize feedback loop gain variation, improving transient response consistency. |
| Overvoltage Protection Clamp | Portable Device Battery Monitoring |
Use Scenario: Clamping surge transients on 24 V CAN bus power rail during load dump events. IC Role / Device Role / Timing Role: Fast-acting shunt protector limiting rail voltage to ≤30.6 V peak. Use Value: Withstands 300 mW pulse power and 0.05 μA leakage, enabling low-quiescent, fail-safe clamping without loading. |
Use Scenario: Scaling lithium-ion battery pack voltage (up to 42 V) into ADC input range of microcontroller fuel gauge. IC Role / Device Role / Timing Role: Precision divider reference node ensuring accurate state-of-charge calculation. Use Value: ±2 % tolerance and +8 × 10⁻⁴/°C TC reduce SoC error to <0.5 % over full temperature and aging range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C30-E3-08 | ±5 % tolerance (vs. ±2 %), same VZ nominal, 5 mA IZT, higher ZZ (30 Ω) | Acceptable where cost sensitivity outweighs precision; less suitable for closed-loop feedback requiring tight regulation. | Select when budget constraints dominate and system-level calibration compensates for wider tolerance. |
| MMBZ5261B-7-F | 30 V nominal, ±5 %, 20 mA IZT, 35 Ω ZZ, SOT-23, Diodes Inc. part | Higher test current shifts optimal operating point; less stable at low-current bias typical in sensor references. | Prefer only if existing design uses Diodes Inc. sourcing infrastructure and can accommodate higher IZT-driven power loss. |
Compared with BZX84B30-E3-08, BZX84C30-E3-08 trades precision for cost, while MMBZ5261B-7-F shifts regulation behavior toward higher-current operation-making BZX84B30-E3-08 uniquely suited for low-IZ, high-stability reference roles.
Availability
BZX84B30-E3-08 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply feedback, and overvoltage protection applications requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for BZX84B30-E3-08 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 series targets precision voltage reference and regulation in space-constrained, thermally demanding applications-designed from inception for compatibility with automated SMT assembly and long-term parametric stability.
FAQ
What is the exact zener voltage tolerance for BZX84B30-E3-08?
The BZX84B30-E3-08 has a guaranteed zener voltage tolerance of ±2 %, meaning its measured VZ falls between 29.4 V and 30.6 V at 2 mA test current and 25 °C ambient-verified per Vishay's BZX84 Series datasheet revision 1.1. This tighter tolerance differentiates it from the ±5 % BZX84C30-E3-08 variant and directly impacts reference accuracy in closed-loop systems.
Does BZX84B30-E3-08 have AEC-Q101 qualification?
The BZX84B30-E3-08 itself is not AEC-Q101 qualified; however, Vishay offers the functionally identical BZX84B30-HE3_A-08 variant, which carries full AEC-Q101 qualification for automotive applications. The "HE3_A" suffix denotes the qualified version, while "E3" indicates RoHS-compliant commercial grade-both share identical electrical specs and SOT-23 packaging.
What is the maximum power dissipation of BZX84B30-E3-08 on a standard FR-4 PCB?
BZX84B30-E3-08 delivers 300 mW maximum power dissipation when mounted on an FR-4 board with Vishay's recommended soldering footprint. This value reflects real-world thermal performance-not the 500 mW junction-to-lead rating-and must be used for thermal design validation to avoid exceeding 150 °C junction temperature under worst-case ambient conditions.
How does the temperature coefficient of BZX84B30-E3-08 affect its performance?
The BZX84B30-E3-08 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 predictable drift enables intentional compensation in multi-device reference networks and ensures monotonic behavior across -55 °C to +150 °C operating range-critical for under-hood automotive use.
Can BZX84B30-E3-08 replace BZX84C30-E3-08 in an existing design?
Yes, BZX84B30-E3-08 is a direct form-fit-function replacement for BZX84C30-E3-08 in the same SOT-23 footprint, but with improved ±2 % tolerance and lower dynamic resistance (21 Ω vs. 30 Ω). No PCB changes are required; however, system-level validation is recommended to confirm enhanced regulation stability meets functional safety or accuracy targets.
BZX84B30-E3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX84
- 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-E3-08 FAQ
1.How can I place an order for BZX84B30-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B30-E3-08 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-E3-08 reliable?
The price and inventory of BZX84B30-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B30-E3-08 is usually 5 days.
3.What payment methods are accepted for BZX84B30-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B30-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B30-E3-08?
BZX84B30-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B30-E3-08 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-E3-08?
For technical support, including BZX84B30-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B30-E3-08 requirements.
6.How does Aetrix verify that BZX84B30-E3-08 is sourced from the original manufacturer or authorized distributors?
All BZX84B30-E3-08 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-E3-08 meets industry standards.
7.What is the process for return or replacement of BZX84B30-E3-08?
All BZX84B30-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B30-E3-08, 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-E3-08 part is unused and in its original packaging.
Return procedure for BZX84B30-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B30-E3-08 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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