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Nexperia USA Inc. BZX84W-B75-QX
- Part No.:
- BZX84W-B75-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B75-QX.pdf
- Description:
- DIODE ZENER 75V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,473
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Product details
Overview
BZX84W-B75-QX from Nexperia is a 75 V ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 275 mW total power dissipation at 25 °C, with 500 Ω typical differential resistance at IZ = 2 mA and 80.2 mV/K temperature coefficient at IZ = 2 mA - used for precision voltage reference and overvoltage clamping in automotive power supply rails.
For engineers reviewing the BZX84W-B75-QX datasheet, BZX84W-B75-QX pinout, BZX84W-B75-QX application, or BZX84W-B75-QX equivalent, this page delivers verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (50 nA at VR = 52.5 V), and SOT323 terminal mapping to support automotive-grade circuit design and component selection.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable 75 V regulation across load and line variations, with low dynamic impedance enabling tight voltage control under transient current shifts. Its ±2 % tolerance and 80.2 mV/K temperature coefficient ensure predictable drift behavior in automotive ambient ranges (−55 °C to +150 °C).
The device features non-repetitive peak reverse power dissipation of 40 W (tp = 100 µs), supports forward current up to 200 mA, and exhibits 0.2 pF junction capacitance at 1 MHz and 0 V bias - making it suitable for high-frequency transient suppression and low-noise reference circuits where parasitic capacitance must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal, ±2 % tolerance (73.5 V to 76.5 V) - defines precise clamping threshold for overvoltage protection. |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous steady-state power handling capability. |
| Differential Resistance (rdif) | 500 Ω max at IZ = 2 mA - determines regulation stiffness and output voltage variation under load current changes. |
| Reverse Leakage (IR) | 50 nA max at VR = 52.5 V (0.7 × VZnom) - ensures minimal standby current in high-impedance bias networks. |
| Temperature Coefficient (SZ) | 80.2 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius, critical for thermal stability in engine bay environments. |
| Junction Capacitance (Cd) | 0.2 pF at f = 1 MHz, VR = 0 V - enables use in RF-coupled protection without signal distortion. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines conduction loss when used in forward-biased polarity protection configurations. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint, 0.65 mm pitch, and 0.1 mm profile - optimized for space-constrained automotive PCB layouts and reflow/wave soldering compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node during Zener operation (reverse bias). |
| 2 | Not Connected (n.c.) | Internally unconnected terminal - must remain floating; no PCB trace or solder mask required. |
| 3 | Cathode (K) | Reverse-bias voltage input node; ties to regulated rail or clamping point in protection circuits. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain, body control, and ADAS modules requiring reliability under thermal cycling and vibration stress. |
| ±2 % Zener tolerance | Enables tighter voltage margin control than ±5 % variants, reducing need for post-regulation trimming in safety-critical subsystems. |
| Low junction capacitance (0.2 pF) | Minimizes high-frequency signal loading in ESD protection paths and RF front-end bias networks. |
| Non-repetitive surge rating (40 W) | Withstands short-duration transients like ISO 7637-2 pulse 1/2a/5a without degradation, supporting robust EMC compliance. |
| Thermal resistance (455 K/W) | Defines junction-to-ambient thermal path on standard FR4; informs derating curves for operation above 25 °C ambient. |
Applications
| Automotive Power Rail Clamping | Industrial Sensor Reference |
|---|---|
|
Use Scenario: Suppressing load-dump transients on 24 V vehicle battery lines feeding infotainment ECUs. IC Role / Device Role / Timing Role: Zener clamp placed between supply rail and ground, conducting only during >75 V excursions to limit downstream IC stress. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V LDOs and microcontrollers by limiting peak rail voltage to ≤76.5 V. |
Use Scenario: Providing stable 75 V reference for isolated current-sense amplifier feedback in motor drive inverters. IC Role / Device Role / Timing Role: High-impedance voltage reference source for precision resistor-divider networks feeding op-amp inputs. Use Value: Enables <1 % full-scale error in 100 A current measurement due to tight VZ tolerance and low tempco. |
| High-Frequency ESD Protection | Backup Voltage Supervisor |
|
Use Scenario: Protecting CAN FD transceiver data lines against fast-rising ESD events in telematics gateways. IC Role / Device Role / Timing Role: Low-capacitance Zener shunt placed between CANH/CANL and chassis ground to divert sub-100 ns surges. Use Value: Maintains signal integrity up to 5 Mbps with <0.2 pF parasitic loading while clamping transients to safe levels. |
Use Scenario: Monitoring main 72 V traction battery voltage in EV battery management systems for undervoltage lockout. IC Role / Device Role / Timing Role: Zener-based comparator input reference that triggers shutdown when Vbatt drops below 73.5 V. Use Value: Provides fail-safe cutoff before cell reversal occurs, using inherent ±2 % accuracy without external 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-Q | Same 75 V nominal rating but ±5 % tolerance (70 V–79 V range) and higher 550 Ω rdif. | Acceptable where cost sensitivity outweighs regulation precision; less suitable for narrow-margin supervision. | Select for non-safety-critical industrial supplies where ±5 % tolerance meets system requirements. |
| MMSZ5265B-TP | 75 V nominal, ±5 %, SOD-123 package, 500 mW Ptot, 1000 Ω rdif, not AEC-Q101 qualified. | Larger footprint and no automotive qualification limits use to consumer or commercial-grade designs. | Choose only for non-automotive applications needing higher power handling and where board space allows SOD-123. |
Compared with BZX84W-C75-Q and MMSZ5265B-TP, the BZX84W-B75-QX offers superior voltage accuracy and automotive qualification - making it the sole choice for AEC-compliant 75 V clamping where regulation stability and reliability are mandatory.
Availability
BZX84W-B75-QX is available at Aetrix Electronics and suitable for automotive power rail clamping, industrial sensor reference, high-frequency ESD protection, and backup voltage supervisor applications requiring stable component supply across production lifecycles.
Supply support for BZX84W-B75-QX 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 energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for automotive voltage regulation, transient suppression, and reference functions where precision, thermal stability, and long-term reliability are essential.
FAQ
What is the maximum reverse voltage the BZX84W-B75-QX can safely clamp?
The BZX84W-B75-QX is rated for 75 V nominal Zener voltage with ±2 % tolerance, meaning its guaranteed clamping range is 73.5 V to 76.5 V at IZ = 2 mA. It withstands non-repetitive surges up to 40 W (100 µs pulse), but sustained reverse voltage beyond 76.5 V risks thermal runaway if power dissipation exceeds 275 mW on standard FR4 PCB.
Is the second pin (Pin 2) electrically functional or a dummy terminal?
Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's official pinning diagram and must remain unconnected in layout and assembly. It serves no electrical function, has no internal bond wire, and must not be tied to ground, supply, or any other net - doing so may compromise mechanical integrity or thermal performance.
How does the 80.2 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
At IZ = 2 mA, the 80.2 mV/K coefficient means VZ increases by ~80 mV per °C rise. Over a 165 °C range, total drift is ~13.2 V - but actual shift depends on operating current and thermal environment. For example, at 85 °C ambient and 2 mA bias, VZ rises ~4.8 V above room-temperature value, requiring system-level compensation in precision references.
Can BZX84W-B75-QX replace BZX84W-C75-Q in an existing AEC-Q101 design?
Yes - the BZX84W-B75-QX is a direct upgrade to the C-version with tighter ±2 % tolerance, identical SOT323 package, pinout, and AEC-Q101 qualification. No layout or schematic changes are needed; improved regulation accuracy may enhance system margin without altering bill-of-materials or test procedures.
BZX84W-B75-QX 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-QX FAQ
1.How can I place an order for BZX84W-B75-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B75-QX 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-QX reliable?
The price and inventory of BZX84W-B75-QX 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-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B75-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B75-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B75-QX?
BZX84W-B75-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B75-QX 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-QX?
For technical support, including BZX84W-B75-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B75-QX requirements.
6.How does Aetrix verify that BZX84W-B75-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B75-QX 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-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B75-QX?
All BZX84W-B75-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B75-QX, 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-QX part is unused and in its original packaging.
Return procedure for BZX84W-B75-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B75-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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