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Vishay General Semiconductor - Diodes Division BZX84B75-G3-18
- Part No.:
- BZX84B75-G3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B75-G3-18.pdf
- Description:
- DIODE ZENER 75V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,935
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Product details
Overview
BZX84B75-G3-18 from Vishay Semiconductors is a silicon planar Zener diode with nominal zener voltage 75 V, ±2 % tolerance, 2 mA test current, 52.5 Ω dynamic resistance at 1 kHz, and 10 × 10⁻⁴/°C positive temperature coefficient - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZX84B75-G3-18 datasheet, BZX84B75-G3-18 pinout, BZX84B75-G3-18 application, or BZX84B75-G3-18 equivalent, this part delivers stable 75 V regulation under low-current conditions, supports high-temperature operation up to +150 °C, and meets JEDEC J-STD-020 MSL level 1 soldering requirements for automated assembly.
Technical Context
This device operates as a single-element, unidirectional Zener diode in reverse-biased breakdown mode, with specified regulation at IZT = 2 mA and VR = 70 V for leakage testing. Its thermal resistance junction-to-ambient is 420 K/W on FR-4 board, and maximum power dissipation is 300 mW under recommended PCB layout.
The BZX84B75-G3-18 exhibits a positive temperature coefficient (αVZ = +10 × 10⁻⁴/°C), indicating increasing zener voltage with rising junction temperature - critical for stability in temperature-varying environments such as automotive cabin electronics or industrial sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 73.5 V min / 75 V nom / 76.5 V max - ensures tight 75 V regulation with ±2 % accuracy for feedback sensing |
| Test Current (IZT) | 2 mA - defines operating point where VZ and dynamic resistance are guaranteed |
| Dynamic Resistance (ZZ) | 52.5 Ω at 1 kHz - determines AC impedance and load regulation sensitivity in feedback networks |
| Reverse Leakage (IR) | 50 μA max at VR = 70 V - limits standby current in high-impedance bias circuits |
| Temperature Coefficient (αVZ) | +10 × 10⁻⁴/°C - enables predictable VZ drift compensation in thermal design |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - sets maximum continuous DC power handling with standard footprint |
| Junction Temperature (Tj) | 150 °C max - supports operation in under-hood or enclosed industrial enclosures |
Pinout & Package
SOT-23 package: 3-terminal surface-mount plastic case with gull-wing leads; terminals arranged anode-cathode-anode (pin 1–2–3), where pin 2 is cathode and pins 1 & 3 are internally connected anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Internally bonded to pin 3; forms common anode connection for bidirectional mounting flexibility |
| Pin 2 | Cathode | Connected to zener junction cathode; must be held at higher potential than anode to enable breakdown conduction |
| Pin 3 | Anode | Internally shorted to pin 1; provides second anode access point for PCB routing redundancy |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables precise voltage clamping without post-production trimming in 75 V reference designs |
| ESD robustness (HBM > 8 kV) | Reduces risk of field failure during handling or in-system electrostatic discharge events |
| MSL level 1 moisture sensitivity | Allows indefinite dry storage and eliminates bake requirement before reflow soldering |
| UL 94 V-0 molding compound | Meets flammability safety standards for consumer and industrial end-equipment certifications |
| Green-compliant (RoHS, halogen-free) | Supports environmental compliance for global market access including EU and China RoHS |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold at secondary-side controller. Use Value: Tight ±2 % VZ tolerance ensures < ±1 % output voltage deviation across line/load/temperature. | Use Scenario: Provides stable 75 V rail for high-side current sense amplifier biasing in motor drive systems. IC Role / Device Role / Timing Role: Precision voltage clamp protecting op-amp input stage from transients. Use Value: Low 52.5 Ω dynamic resistance minimizes voltage shift under varying sense current loads. |
| Automotive Cabin Control Module | Programmable Logic Controller Input Protection |
Use Scenario: Clamps 12 V system surges to protect microcontroller I/O pins in HVAC control units. IC Role / Device Role / Timing Role: Overvoltage suppression device placed between LIN bus interface and MCU GPIO. Use Value: +10 × 10⁻⁴/°C αVZ allows predictable clamping voltage rise during under-dash thermal cycling. | Use Scenario: Shields digital input circuitry from induced transients on 24 V DC field wiring. IC Role / Device Role / Timing Role: Standby-mode shunt regulator absorbing surge energy before TVS activation. Use Value: 300 mW power rating sustains 2 ms 100 V transients per IEC 61000-4-4 without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5265B-7-F | 75 V nominal, ±5 % tolerance, 70 Ω ZZ, SOT-23 package | Looser voltage tolerance increases output variation in precision feedback; higher ZZ reduces regulation fidelity | Select when cost sensitivity outweighs regulation accuracy and thermal drift control |
| BZX84C75-G3-18 | 75 V nominal, ±5 % tolerance, same package and thermal specs | Higher leakage (100 μA vs. 50 μA) and wider VZ spread reduce stability in low-power bias networks | Choose only if ±5 % tolerance is acceptable and existing BOM uses C-grade marking |
Compared with BZX84B75-G3-18, MMBZ5265B-7-F trades tighter thermal coefficient and lower dynamic resistance for lower cost, while BZX84C75-G3-18 sacrifices voltage accuracy for broader availability - making BZX84B75-G3-18 optimal for designs requiring both precision regulation and high-temperature reliability.
Availability
BZX84B75-G3-18 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive cabin electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84B75-G3-18 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 manufacturer specializing in discrete semiconductors and passive components, with core expertise in high-reliability diodes, MOSFETs, and resistive solutions.
The BZX84-G series targets commercial-grade precision voltage regulation, designed specifically for space-constrained, cost-sensitive applications needing stable Zener performance across -55 °C to +150 °C.
FAQ
What is the exact zener voltage range for BZX84B75-G3-18 at 25 °C?
The BZX84B75-G3-18 has a guaranteed zener voltage range of 73.5 V minimum to 76.5 V maximum at 25 °C and 2 mA test current, with 75 V nominal value - confirmed in Vishay's official datasheet revision 1.1 (24-Jan-2024), table on page 3 under "ELECTRICAL CHARACTERISTICS" for part number BZX84B75-G.
Is BZX84B75-G3-18 suitable for automotive applications?
The BZX84B75-G3-18 is not AEC-Q101 qualified per Vishay's ordering table; however, it operates across -55 °C to +150 °C and offers HBM ESD > 8 kV, making it usable in non-safety-critical automotive cabin modules where qualification is not mandated - but BZX84B75-G3-18 must not be deployed in airbag, braking, or ADAS subsystems without formal AEC-Q101 validation.
What is the maximum power dissipation for BZX84B75-G3-18 on a standard FR-4 PCB?
The BZX84B75-G3-18 has a maximum power dissipation of 300 mW when mounted on an FR-4 board with Vishay's recommended soldering footprint, as specified in the "ABSOLUTE MAXIMUM RATINGS" table (page 2). This derates linearly above 25 °C ambient per the curve in Figure 1, reaching ~150 mW at 100 °C ambient.
Does BZX84B75-G3-18 have a defined cathode marking?
Yes - BZX84B75-G3-18 uses standard SOT-23 polarity marking: a band on the package body identifies pin 2 as the cathode terminal, consistent with Vishay's package drawing S8-V-3929.01-009 (page 4) and all BZX84-G series devices. Pin 1 and pin 3 are anode connections.
What is the dynamic resistance of BZX84B75-G3-18 and why does it matter?
The BZX84B75-G3-18 has a dynamic resistance (ZZ) of 52.5 Ω measured at 1 kHz and 2 mA test current. This value directly impacts regulation accuracy: lower ZZ means less output voltage shift under changing load current, which is essential for maintaining tight tolerances in feedback networks and reference rails.
BZX84B75-G3-18 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):
- 75 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B75-G3-18 FAQ
1.How can I place an order for BZX84B75-G3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B75-G3-18 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 BZX84B75-G3-18 reliable?
The price and inventory of BZX84B75-G3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B75-G3-18 is usually 5 days.
3.What payment methods are accepted for BZX84B75-G3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B75-G3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B75-G3-18?
BZX84B75-G3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B75-G3-18 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 BZX84B75-G3-18?
For technical support, including BZX84B75-G3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B75-G3-18 requirements.
6.How does Aetrix verify that BZX84B75-G3-18 is sourced from the original manufacturer or authorized distributors?
All BZX84B75-G3-18 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 BZX84B75-G3-18 meets industry standards.
7.What is the process for return or replacement of BZX84B75-G3-18?
All BZX84B75-G3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B75-G3-18, 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 BZX84B75-G3-18 part is unused and in its original packaging.
Return procedure for BZX84B75-G3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B75-G3-18 Tags
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