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Nexperia USA Inc. BZX84W-B75X
- Part No.:
- BZX84W-B75X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B75X.pdf
- Description:
- DIODE ZENER 75V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX84W-B75X from Nexperia is a ±2% tolerance Zener voltage regulator diode rated for 75 V nominal working voltage, 275 mW total power dissipation, and 200 mA maximum forward current in a SOT323 (SC-70) surface-mount package. It provides precise voltage reference and overvoltage protection in compact power management circuits such as DC-DC feedback loops and I/O rail clamping.
For engineers reviewing the BZX84W-B75X datasheet, BZX84W-B75X pinout, BZX84W-B75X application, or BZX84W-B75X equivalent, this part supports high-frequency regulation, low-leakage reverse bias operation at 0.7 × VZnom, and thermal stability up to 150 °C junction temperature in space-constrained designs.
Technical Context
This Zener diode operates in reverse breakdown with a typical differential resistance of 500 Ω at IZ = 2 mA and exhibits a positive temperature coefficient of +80.2 mV/K at that current. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses, enabling transient surge suppression.
The device features low junction-to-ambient thermal resistance (455 K/W on FR4 PCB), 0.2 pF capacitance at 1 MHz and 0 V bias, and reverse leakage current ≤50 nA at VR = 52.5 V (0.7 × 75 V), supporting stable regulation in noise-sensitive analog and mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 75 V ±2 % - defines precise clamping threshold for 75 V rail protection or reference |
| Total Power Dissipation | 275 mW - maximum continuous steady-state power handling on standard FR4 PCB |
| Forward Voltage | ≤0.9 V at IF = 10 mA - ensures low-loss conduction in series polarity configurations |
| Differential Resistance | 500 Ω at IZ = 2 mA - determines regulation stiffness and output impedance under load variation |
| Reverse Leakage Current | ≤50 nA at VR = 52.5 V - guarantees minimal quiescent current in standby or high-impedance bias networks |
| Junction Temperature | −55 °C to +150 °C - enables operation in extended industrial and automotive-adjacent environments |
| Package | SOT323 (SC-70) - 1.3 mm × 1.8 mm footprint ideal for dense PCB layouts and automated assembly |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm body size, 0.65 mm lead pitch, and tin-plated copper terminations compatible with standard reflow profiles.
| 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 terminal; must remain unconnected to avoid parasitic coupling or solder bridging |
| 3 | Cathode (K) | Reverse-bias terminal tied to regulated voltage node; carries Zener current during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tight regulation without post-production trimming in precision reference circuits |
| Low 0.2 pF junction capacitance | Minimizes signal distortion and phase shift in RF biasing and high-frequency clamp applications |
| 455 K/W thermal resistance (j-a) | Supports reliable power handling without heatsinking in ambient temperatures up to +85 °C |
| Non-repetitive 40 W pulse rating | Withstands ESD transients and short-duration surges per IEC 61000-4-2 Level 4 |
| FR4-compatible footprint | Validated for reflow and wave soldering using standard IPC-7351B land patterns |
Applications
| Power Supply Feedback Loop | I/O Rail Protection |
|---|---|
Use Scenario: Regulating output voltage of a flyback converter via optocoupler-coupled feedback network. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side control loop. Use Value: 75 V rating allows direct sensing of 48 V telecom rails with margin; ±2 % tolerance reduces output drift to ±0.96 V. |
Use Scenario: Clamping 24 V industrial sensor interface lines against induced transients. IC Role / Device Role / Timing Role: Bidirectional overvoltage protector placed between signal line and ground. Use Value: 50 nA leakage at 52.5 V ensures <1 µW standby loss; 40 W pulse rating absorbs 1 kV/500 A surge per IEC 61000-4-5. |
| Reference Voltage Source | High-Frequency Bias Network |
Use Scenario: Providing stable bias for RF amplifier stage requiring low-noise 75 V supply. IC Role / Device Role / Timing Role: Shunt reference generating fixed DC offset independent of load current variation. Use Value: 500 Ω dynamic impedance limits output voltage change to <125 mV across 250 µA load swing. |
Use Scenario: DC biasing of GaN HEMT gate driver in 1–10 MHz switching converters. IC Role / Device Role / Timing Role: Low-capacitance voltage clamp stabilizing gate-source potential during fast edge transitions. Use Value: 0.2 pF capacitance avoids resonance with gate drive loop inductance; 0.9 V forward drop minimizes forward conduction loss. |
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, higher max leakage (50 nA vs. same test condition), identical package and power rating | Suitable where cost sensitivity outweighs precision; less suitable for closed-loop feedback requiring tight VZ stability | Select when budget constraints dominate and system-level calibration compensates for wider tolerance |
| MMSZ5265BT1G | 75 V ±5 %, SOD-123 package (larger footprint), 500 mW Ptot, 300 Ω rdif at 20 mA | Better power handling but incompatible with ultra-dense layouts; higher thermal mass delays transient response | Choose when board space permits larger package and higher continuous power is required beyond 275 mW |
Compared with BZX84W-C75, the BZX84W-B75X offers tighter voltage control critical for feedback accuracy; versus MMSZ5265BT1G, it trades power headroom for miniaturization and faster transient clamping due to lower capacitance and thermal mass.
Availability
BZX84W-B75X is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection, precision reference generation, and high-frequency bias networks requiring stable component supply across production lifecycles.
Supply support for BZX84W-B75X 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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, consumer, and communications markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, high-stability voltage regulation and transient suppression in space-constrained SMT applications.
FAQ
What is the maximum reverse voltage before breakdown for BZX84W-B75X?
The nominal Zener voltage is 75 V with ±2 % tolerance, meaning guaranteed breakdown occurs between 73.5 V and 76.5 V at IZ = 2 mA. The absolute maximum non-repetitive reverse voltage is limited by the 40 W pulse rating-exceeding 76.5 V continuously risks thermal runaway unless power dissipation remains within 275 mW.
Can BZX84W-B75X be used in place of a 75 V Zener with ±5 % tolerance?
Yes, BZX84W-B75X is pin- and form-factor compatible with ±5 % variants like BZX84W-C75 and shares identical SOT323 packaging, thermal characteristics, and limiting values. Its tighter tolerance improves regulation accuracy but does not alter mounting, soldering, or layout requirements.
What is the significance of the 'n.c.' pin in the SOT323 package?
Pin 2 is electrically unconnected and serves only as a mechanical anchor for the leadframe. It must remain unconnected in PCB layout and assembly to prevent unintended coupling, solder bridging, or thermal path disruption. No trace or pad should contact this terminal.
How does thermal resistance affect real-world power handling on a standard PCB?
With Rth(j-a) = 455 K/W on FR4 single-sided copper, dissipating 275 mW raises junction temperature by 125 °C above ambient. At 25 °C ambient, Tj reaches 150 °C-the absolute maximum-so derating is required above 25 °C ambient to maintain reliability and avoid permanent degradation.
BZX84W-B75X 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-B75X FAQ
1.How can I place an order for BZX84W-B75X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B75X 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-B75X reliable?
The price and inventory of BZX84W-B75X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B75X is usually 5 days.
3.What payment methods are accepted for BZX84W-B75X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B75X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B75X?
BZX84W-B75X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B75X 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-B75X?
For technical support, including BZX84W-B75X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B75X requirements.
6.How does Aetrix verify that BZX84W-B75X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B75X 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-B75X meets industry standards.
7.What is the process for return or replacement of BZX84W-B75X?
All BZX84W-B75X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B75X, 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-B75X part is unused and in its original packaging.
Return procedure for BZX84W-B75X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B75X Tags
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