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Nexperia USA Inc. BZX84W-B75F
- Part No.:
- BZX84W-B75F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B75F.pdf
- Description:
- DIODE ZENER 75V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,022
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Product details
Overview
BZX84W-B75F from Nexperia is a ±2% tolerance Zener voltage regulator diode with 75 V nominal breakdown voltage, 275 mW total power dissipation, and SOT323 (SC-70) surface-mount package. It provides precise voltage reference and overvoltage protection in low-power analog circuits, power supply feedback loops, and voltage clamp stages.
For engineers reviewing the BZX84W-B75F datasheet, BZX84W-B75F pinout, BZX84W-B75F application, or BZX84W-B75F equivalent, this page delivers verified electrical parameters, thermal behavior, terminal configuration, real-world use cases, and validated alternative parts for design-in and sourcing decisions.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 75 V regulation at IZ = 5 mA, with differential resistance of 500 Ω and temperature coefficient of +80.2 mV/K. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses.
Designed for high-frequency stability, it exhibits only 0.2 pF junction capacitance at 1 MHz and 0 V bias, and supports ambient operation from −55 °C to +150 °C with maximum junction temperature of 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal, ±2% tolerance (73.5–76.5 V), specified at IZ = 5 mA - ensures tight regulation in precision reference designs |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - defines continuous DC power handling under standard board layout |
| Differential Resistance (rdif) | 500 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 50 nA max at VR = 0.7 × VZnom = 52.5 V - guarantees low leakage in standby or high-impedance bias networks |
| Junction Capacitance (Cd) | 0.2 pF at f = 1 MHz, VR = 0 V - enables minimal signal distortion in RF clamping and fast transient suppression |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - confirms low conduction loss when used in forward-biased protection paths |
| Thermal Resistance (Rth(j-a)) | 455 K/W in free air on FR4 - quantifies self-heating impact under sustained power dissipation |
Pinout & Package
The BZX84W-B75F is housed in a leadless SOT323 (SC-70) plastic surface-mount package measuring 2.2 mm × 1.35 mm × 0.95 mm, optimized for high-density PCB layouts and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad - must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal; tied to regulated voltage node and current-limiting resistor in standard shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter output voltage control than ±5% variants, reducing need for post-regulation trimming in feedback networks |
| 0.2 pF junction capacitance | Minimizes high-frequency loading in RF detector circuits and fast-switching clamp applications |
| 40 W non-repetitive surge rating | Supports transient overvoltage suppression up to 100 µs without degradation, suitable for ESD and surge events |
| −55 °C to +150 °C operating range | Validates reliability in automotive under-hood, industrial motor drives, and outdoor power electronics |
| SOT323 footprint compatibility | Ensures drop-in replacement with industry-standard SC-70 land patterns, simplifying layout reuse across voltage grades |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
|
Use Scenario: Stabilizing output voltage in adjustable DC-DC converter feedback loop using TL431-like topology. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 75 V setpoint to error amplifier input. Use Value: Maintains ±0.5% output regulation accuracy across line/load variations due to low rdif and tight VZ tolerance. |
Use Scenario: Protecting 3.3 V GPIO pins from accidental 75 V rail exposure during system fault conditions. IC Role / Device Role / Timing Role: Fast-acting crowbar element that conducts above 75 V to divert surge current away from sensitive logic. Use Value: Limits pin voltage to ≤76.5 V within 100 ns, leveraging 0.2 pF Cd and 40 W pulse rating to absorb >100 mJ transients. |
| High-Voltage Sensor Biasing | Programmable Threshold Detector |
|
Use Scenario: Providing stable bias voltage to photodiode amplifier in industrial laser power monitor operating at 70 V bus. IC Role / Device Role / Timing Role: Low-noise Zener reference establishing fixed common-mode level for transimpedance stage. Use Value: Delivers <10 µV/°C drift via +80.2 mV/K coefficient matched to op-amp offset compensation network. |
Use Scenario: Setting trip point for comparator-based battery pack overvoltage shutdown at 75 V threshold. IC Role / Device Role / Timing Role: Precision voltage reference feeding non-inverting input of rail-to-rail comparator. Use Value: Enables 1.5 V window detection accuracy (±2% × 75 V) without external trimming resistors or DAC calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C75 | ±5% tolerance (70–79 V), identical package and Ptot | Accepts wider output variation; less suitable for precision feedback but lower cost | Select when regulation accuracy <±3% suffices and BOM cost optimization is prioritized |
| MMSZ5265B | 75 V ±5%, SOD-123 package, 500 mW Ptot, 100 Ω rdif | Higher power handling and lower impedance, but 2× larger footprint and higher Cd (4 pF) | Choose for higher-current clamping where board space allows and faster regulation response is needed |
Compared with BZX84W-C75, the BZX84W-B75F offers tighter voltage control critical for closed-loop systems; versus MMSZ5265B, it trades power capacity and impedance for ultra-low capacitance and compact SOT323 integration in space-constrained designs.
Availability
BZX84W-B75F is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamps, and high-voltage sensor biasing requiring stable component supply across industrial, test equipment, and embedded control programs.
Supply support for BZX84W-B75F 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in advanced packaging and automotive-grade components.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation and transient suppression in cost-sensitive, space-constrained consumer, industrial, and computing applications.
FAQ
What is the maximum continuous reverse current the BZX84W-B75F can sustain at 75 V?
The device is not rated for continuous operation at its full Zener voltage. At 75 V, the maximum steady-state reverse current is limited by Ptot = 275 mW, yielding IZ ≤ 3.67 mA. Exceeding this risks thermal runaway; practical designs limit IZ to 1–5 mA with appropriate series resistance and board thermal relief.
Can BZX84W-B75F be used in place of a 75 V TVS diode for ESD protection?
No - while it handles 40 W non-repetitive surges, its 50 nA leakage at 52.5 V and lack of defined clamping voltage make it unsuitable as a primary ESD protector. Dedicated TVS diodes (e.g., PESD5V0S1BA) offer lower dynamic impedance, guaranteed clamping, and IEC 61000-4-2 compliance.
How does the +80.2 mV/K temperature coefficient affect regulation accuracy over temperature?
At 75 V nominal, +80.2 mV/K means VZ increases ~1.2 V over a 15 °C rise. In a 0–70 °C ambient range, total drift is ~5.6 V - acceptable for coarse references but requires compensation (e.g., thermistor network) in precision applications demanding <±0.5% stability.
Is Pin 2 (n.c.) required to be left floating on the PCB?
Yes - Pin 2 is internally unconnected and must remain unattached in layout. Connecting it to ground or any net introduces parasitic capacitance and potential leakage paths, degrading high-frequency performance and increasing reverse leakage beyond the specified 50 nA.
BZX84W-B75F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B75F FAQ
1.How can I place an order for BZX84W-B75F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B75F 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 BZX84W-B75F reliable?
The price and inventory of BZX84W-B75F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B75F is usually 5 days.
3.What payment methods are accepted for BZX84W-B75F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B75F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B75F?
BZX84W-B75F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B75F 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 BZX84W-B75F?
For technical support, including BZX84W-B75F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B75F requirements.
6.How does Aetrix verify that BZX84W-B75F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B75F 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 BZX84W-B75F meets industry standards.
7.What is the process for return or replacement of BZX84W-B75F?
All BZX84W-B75F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B75F, 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 BZX84W-B75F part is unused and in its original packaging.
Return procedure for BZX84W-B75F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B75F Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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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
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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