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Nexperia USA Inc. BZX84W-B75-QF
- Part No.:
- BZX84W-B75-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B75-QF.pdf
- Description:
- DIODE ZENER 75V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,227
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Product details
Overview
BZX84W-B75-QF 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 clamping in automotive power supply monitoring circuits.
For engineers reviewing the BZX84W-B75-QF datasheet, BZX84W-B75-QF pinout, BZX84W-B75-QF application, or BZX84W-B75-QF equivalent, this page delivers verified Zener voltage, thermal resistance, reverse leakage, differential resistance, and AEC-Q101 qualification status for automotive-grade design validation.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 75 V output under reverse-biased conditions with 500 Ω typical differential resistance at IZ = 2 mA and +80.2 mV/K temperature coefficient at that current. It exhibits 35 pF junction capacitance at 1 MHz and 0 V bias.
Designed for high-reliability automotive environments, it supports continuous operation from −55 °C to +150 °C ambient and withstands non-repetitive 40 W surge pulses (100 µs), with thermal resistance of 455 K/W when mounted on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 75 V nominal, ±2 % tolerance (73.5–76.5 V range); defines precise clamping threshold for 12 V/24 V automotive rail protection. |
| Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4; sets maximum continuous DC or low-duty-cycle pulse load capability. |
| Differential Resistance rdif | 500 Ω max at IZ = 2 mA; determines regulation stiffness and output impedance in feedback or reference paths. |
| Reverse Leakage IR | 50 nA max at VR = 52.5 V (0.7 × VZnom); ensures minimal standby current in high-impedance sensing nodes. |
| Thermal Resistance Rth(j-a) | 455 K/W; indicates junction-to-ambient heat transfer efficiency on standard single-sided copper FR4 layout. |
| Junction Temperature Tj | 150 °C max; defines upper thermal limit for sustained operation in under-hood electronics. |
| Capacitance Cd | 0.2 pF typical at f = 1 MHz, VR = 0 V; enables use in >100 MHz transient suppression without signal distortion. |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint per Figure 9 (reflow) and Figure 10 (wave soldering); dimensions per Figure 8 (A = 1.3 mm, D = 2.2 mm, E = 1.35 mm, e = 0.65 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener configuration (e.g., ground or regulated rail return). |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask opening required. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node (e.g., input rail or signal line) for clamping/regulation function. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| ±2 % Zener tolerance | Enables tighter voltage margin control vs. ±5 % variants, reducing design guardbanding in safety-critical monitoring. |
| Low 0.2 pF capacitance | Minimizes high-frequency signal loading in RF front-end protection or fast-switching power supply feedback loops. |
| 40 W non-repetitive surge rating | Withstands ISO 7637-2 pulse 1/2a/5a transients without degradation when used with series impedance. |
| −55 °C to +150 °C operating range | Supports placement in under-hood locations where ambient exceeds 105 °C and cold cranking drops below −40 °C. |
Applications
| Automotive Power Rail Monitoring | Industrial Sensor Reference |
|---|---|
|
Use Scenario: Monitoring 24 V battery voltage in ADAS camera modules to detect overvoltage events before system reset. IC Role / Device Role / Timing Role: Shunt regulator providing fixed 75 V clamp point upstream of LDO input to prevent damage during load dump. Use Value: Limits transient energy via controlled avalanche conduction while maintaining <50 nA leakage at nominal 24 V, preserving sensor sleep current budget. |
Use Scenario: Providing stable reference voltage for 16-bit analog-to-digital conversion in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision Zener element in buffered reference divider network, delivering 75 V intermediate reference for scaling high-voltage industrial signals. Use Value: ±2 % tolerance and 500 Ω rdif ensure <0.1 % full-scale error contribution across temperature, meeting IEC 61000-4-5 surge immunity requirements. |
| High-Frequency ESD Protection | Overvoltage Clamping in DC-DC Feedback |
|
Use Scenario: Protecting CAN FD transceiver I/O pins against fast-rising ESD events (IEC 61000-4-2 ±8 kV contact discharge). IC Role / Device Role / Timing Role: Low-capacitance (0.2 pF) Zener clamp placed between CANH/CANL and ground, activated only above 75 V. Use Value: Capacitance avoids signal integrity degradation at 5 Mbps, while AEC-Q101 qualification guarantees reliability in automotive communication networks. |
Use Scenario: Safeguarding isolated flyback converter feedback optocoupler input against output overvoltage caused by secondary-side component failure. IC Role / Device Role / Timing Role: Zener connected across optocoupler LED anode-cathode to clamp feedback voltage at 75 V if primary-side regulation fails. Use Value: 275 mW power rating sustains clamping during extended fault conditions without thermal runaway, enabling safe shutdown sequencing. |
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-Q | ±5 % tolerance (70–79 V range); identical package, power, and thermal specs. | Acceptable where wider voltage margin is permitted (e.g., non-safety-critical backup supplies). | Select for cost-sensitive designs where 75 V nominal is target but absolute accuracy is secondary to BOM consolidation. |
| MMSZ5265B-TP | 75 V ±5 %, SOD-123 package, 500 mW Ptot, 300 Ω rdif, not AEC-Q101 qualified. | Suitable for industrial/commercial power supplies but not automotive due to missing qualification. | Choose only for non-automotive applications requiring higher power headroom and lower dynamic impedance. |
Compared with BZX84W-B75-QF, the ±5 % BZX84W-C75-Q offers identical form-factor and automotive qualification at lower cost but sacrifices 3 V regulation precision; MMSZ5265B-TP trades AEC-Q101 compliance for higher power and lower impedance in a larger package unsuitable for space-constrained automotive PCBs.
Availability
BZX84W-B75-QF is available at Aetrix Electronics and suitable for automotive power management, industrial sensor reference, high-frequency ESD protection, and DC-DC feedback clamping requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX84W-B75-QF 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 automotive-qualified components and advanced packaging.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh automotive and industrial environments.
FAQ
What is the maximum reverse voltage the BZX84W-B75-QF can safely clamp?
The device is rated for 75 V nominal Zener voltage with ±2 % tolerance, meaning it begins regulating between 73.5 V and 76.5 V. Its absolute maximum reverse voltage is not specified separately-it is designed to operate continuously up to its rated VZ under defined current and thermal conditions. Exceeding 76.5 V without current limiting risks exceeding Ptot or Tj limits.
Is pin 2 electrically connected internally?
No-pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is an unconnected terminal with no internal bond wire or die connection. PCB layout must leave this pad floating; no trace, via, or ground connection is permitted.
How does the 0.2 pF capacitance impact high-speed signal lines?
At 1 MHz, the 0.2 pF junction capacitance introduces negligible reactance (>800 kΩ), making it suitable for clamping fast transients on signals up to 500 MHz without measurable attenuation or phase shift. This enables use on CAN FD, LIN, or digital I/O lines where traditional Zeners would distort timing.
Can BZX84W-B75-QF replace BZX84C75 in existing designs?
Yes, mechanically and electrically-both use SOT323 and share identical pinout, power rating, and thermal characteristics. However, BZX84W-B75-QF offers ±2 % tolerance versus ±5 % for the 'C' variant, improving voltage accuracy but potentially increasing cost. No layout change is needed for drop-in replacement.
BZX84W-B75-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- 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 @ 52.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B75-QF FAQ
1.How can I place an order for BZX84W-B75-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B75-QF 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-B75-QF reliable?
The price and inventory of BZX84W-B75-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B75-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B75-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B75-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B75-QF?
BZX84W-B75-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B75-QF 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-B75-QF?
For technical support, including BZX84W-B75-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B75-QF requirements.
6.How does Aetrix verify that BZX84W-B75-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B75-QF 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-B75-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B75-QF?
All BZX84W-B75-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B75-QF, 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-B75-QF part is unused and in its original packaging.
Return procedure for BZX84W-B75-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B75-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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