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Nexperia USA Inc. BZX84W-B68-QF
- Part No.:
- BZX84W-B68-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B68-QF.pdf
- Description:
- DIODE ZENER 68V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,564
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Product details
Overview
BZX84W-B68-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode with 68 V nominal breakdown voltage, 275 mW total power dissipation, and SOT323 (SC-70) surface-mount package. It delivers stable reference voltage in automotive power supply monitoring, ECU voltage clamping, and high-frequency noise suppression circuits.
For engineers reviewing the BZX84W-B68-QF datasheet, BZX84W-B68-QF pinout, BZX84W-B68-QF application, or BZX84W-B68-QF equivalent, this page provides verified Zener voltage, thermal resistance, differential resistance, reverse leakage, and AEC-Q101 qualification status for automotive-grade design validation.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased mode, with a typical Zener voltage of 66.6 V to 69.4 V at IZ = 2 mA and a temperature coefficient of +71.7 mV/K. Its low 0.25 pF capacitance at 1 MHz and VR = 0 V enables effective high-frequency bypassing.
The diode features non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses and is qualified per AEC-Q101 for operation from −55 °C to +150 °C ambient, supporting under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 66.6 V to 69.4 V at IZ = 2 mA - defines precise clamping threshold for 68 V nominal rail protection |
| Tolerance | ±2 % - ensures tight regulation window for safety-critical voltage monitoring |
| Differential Resistance (rdiff) | 475 Ω max at IZ = 2 mA - determines dynamic impedance affecting regulation stability under load transients |
| Reverse Leakage (IR) | 50 nA max at VR = 47.6 V - guarantees minimal standby current in always-on automotive subsystems |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets continuous thermal limit for compact PCB layouts |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W - quantifies self-heating impact during sustained Zener conduction |
| Capacitance (Cd) | 0.25 pF at f = 1 MHz, VR = 0 V - enables RF filtering without signal distortion in high-speed interfaces |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals; dimensions per JEDEC outline: 2.2 mm × 1.35 mm × 0.95 mm height; suitable for reflow and wave soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node when used as shunt regulator |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Zener breakdown terminal; connects to regulated voltage rail for clamping or reference generation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power domains |
| ±2 % Zener voltage tolerance | Enables tighter system-level voltage margining than ±5 % variants, reducing need for post-regulation trimming |
| Low 0.25 pF junction capacitance | Minimizes signal loading in RF detector circuits and high-speed data line protection |
| 40 W non-repetitive surge capability | Withstands ISO 7637-2 pulse 1/2a/2b transients without degradation in automotive 12 V systems |
| 150 °C maximum junction temperature | Supports placement near heat-generating components in dense engine compartment PCBs |
Applications
| Automotive ECU Power Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Real-time monitoring of 68 V auxiliary battery rail in 48 V mild-hybrid vehicle ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC input scaling and overvoltage fault detection logic. Use Value: ±2 % tolerance ensures <1.4 V absolute error at 68 V, enabling accurate state-of-charge estimation within 0.5 % SOC resolution. |
Use Scenario: Precision biasing of bridge-based pressure sensors in factory automation transmitters. IC Role / Device Role / Timing Role: Stable excitation voltage source for Wheatstone bridge, referenced to system ground. Use Value: 475 Ω differential resistance limits output drift to <0.3 mV under 100 µA bridge current variation, preserving 16-bit measurement integrity. |
| High-Frequency EMI Suppression | Programmable Logic Supply Clamping |
|
Use Scenario: RF noise suppression on CAN FD transceiver VCC pins operating at 5 Mbps. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp absorbing GHz-range switching noise from nearby DC-DC converters. Use Value: 0.25 pF capacitance avoids resonance with 100 nH trace inductance below 10 GHz, preventing signal integrity degradation. |
Use Scenario: Overvoltage protection for FPGA configuration I/O banks powered from 3.3 V LDOs. IC Role / Device Role / Timing Role: Fast-response crowbar element triggered by transient spikes exceeding 68 V on shared backplane rails. Use Value: 40 W non-repetitive surge rating absorbs 100 µs, 1 A transient without latch-up, maintaining FPGA functional safety integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C68-Q | ±5 % tolerance (64.0 V–72.0 V range); identical package, power, and thermal specs | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive industrial designs where ±2 % precision is not required |
| MMSZ5263B-TP | 68 V nominal, ±5 %, SOD-123 package, 500 mW Ptot, Rth(j-a) = 350 K/W | Higher power handling but larger footprint and no AEC-Q101 qualification | Choose only for non-automotive applications requiring >275 mW continuous dissipation |
Compared with BZX84W-C68-Q, the BZX84W-B68-QF offers tighter regulation critical for automotive diagnostics; versus MMSZ5263B-TP, it trades higher surge robustness and smaller size for lower power rating and certified automotive reliability.
Availability
BZX84W-B68-QF is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and high-frequency EMI suppression requiring stable component supply across production lifecycles.
Supply support for BZX84W-B68-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, headquartered in Nijmegen, Netherlands.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for voltage reference, clamping, and regulation in harsh-environment electronic control modules.
FAQ
What is the maximum continuous reverse current the BZX84W-B68-QF can sustain at 25 °C?
The device supports a maximum continuous reverse current of 4.06 mA at its nominal 68 V Zener voltage, calculated from Ptot = 275 mW and VZ ≈ 68 V. This assumes full power dissipation is allocated to Zener conduction with no forward-bias contribution, and derates linearly above 25 °C per the 455 K/W thermal resistance.
Does the n.c. pin (pin 2) require PCB routing or grounding?
No - pin 2 is internally not connected and must remain un-routed and un-soldered on the PCB. Routing or grounding this terminal risks mechanical stress on the die bond wire, potential shorting due to solder wicking, or violation of the SOT323 thermal profile during reflow. The datasheet explicitly defines it as "not connected" with no electrical or thermal function.
How does the +71.7 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
Over that range, the Zener voltage shifts approximately +6.1 V (71.7 mV/K × 85 K), resulting in a total VZ span of 66.6 V to 72.7 V. This is fully within the device's specified min/max limits (66.6 V to 69.4 V at 25 °C plus temperature-induced drift), and the shift is monotonic and predictable for compensation in closed-loop systems.
Can BZX84W-B68-QF replace BZX84-C68 in existing designs?
Yes, electrically and mechanically - both share identical SOT323 package, pinout, and 68 V nominal rating. However, the BZX84W-B68-QF adds AEC-Q101 qualification, tighter ±2 % tolerance, and updated thermal characterization. No layout change is needed, but automotive designs gain validated reliability and reduced voltage uncertainty.
BZX84W-B68-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):
- 68 V
- Tolerance:
- ±2.06%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-B68-QF FAQ
1.How can I place an order for BZX84W-B68-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B68-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-B68-QF reliable?
The price and inventory of BZX84W-B68-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-B68-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B68-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B68-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B68-QF?
BZX84W-B68-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B68-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-B68-QF?
For technical support, including BZX84W-B68-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B68-QF requirements.
6.How does Aetrix verify that BZX84W-B68-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B68-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-B68-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B68-QF?
All BZX84W-B68-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B68-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-B68-QF part is unused and in its original packaging.
Return procedure for BZX84W-B68-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B68-QF Tags
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MM5Z5V1ST1G
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