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Nexperia USA Inc. BZX84W-B12-QF
- Part No.:
- BZX84W-B12-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B12-QF.pdf
- Description:
- DIODE ZENER 12V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,780
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Product details
Overview
BZX84W-B12-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 12 V nominal regulation at 5 mA, with 150 Ω typical differential resistance and 8.4 mV/K temperature coefficient. It delivers stable reference voltage in automotive power supply rails, ECU voltage monitoring circuits, and overvoltage protection clamps.
For engineers reviewing the BZX84W-B12-QF datasheet, BZX84W-B12-QF pinout, BZX84W-B12-QF application, or BZX84W-B12-QF equivalent, this page provides verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (100 nA at 8 V), and SOT323 terminal mapping for PCB layout and reliability validation.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining regulated output by conducting reverse current above its 12 V breakdown threshold. Its ±2 % tolerance ensures tight voltage accuracy across production lots, while the 150 °C maximum junction temperature supports under-hood automotive environments.
The SOT323 package enables high-density placement on FR4 PCBs with standard reflow footprints, and its 275 mW total power dissipation (at 25 °C ambient, single-sided copper) defines safe DC operating limits without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 12 V at IZ = 5 mA - sets precise regulation point for 12 V rail stabilization |
| Tolerance | ±2 % - guarantees voltage deviation ≤ ±0.24 V for high-accuracy feedback loops |
| Differential Resistance | 150 Ω max at IZ = 5 mA - determines load regulation error under varying current draw |
| Reverse Leakage Current | 100 nA max at VR = 8 V - ensures minimal quiescent power loss in standby mode |
| Total Power Dissipation | 275 mW at Tamb = 25 °C on FR4 PCB - defines maximum continuous DC power handling |
| Junction Temperature | −55 °C to +150 °C - enables operation in extended automotive temperature ranges |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TC, and HAST stress tests |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; leadless construction optimized for automated assembly and space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential side of regulation node |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode (K) | Zener breakdown terminal; connects to higher-potential side (e.g., input rail) |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - qualified for engine control units, body electronics, and ADAS modules |
| Low thermal resistance | 455 K/W junction-to-ambient - enables stable regulation without forced cooling in compact enclosures |
| High-frequency stability | 2.5 pF capacitance at 1 MHz - minimizes phase shift in fast transient suppression applications |
| Precision voltage reference | 12 V ±0.24 V tolerance - reduces calibration overhead in analog sensor signal conditioning |
| Robust surge handling | 40 W non-repetitive peak reverse power (100 µs pulse) - withstands load dump transients per ISO 7637-2 |
Applications
| Engine Control Unit (ECU) Reference | Infotainment Power Sequencing |
|---|---|
Use Scenario: Providing stable 12 V reference for microcontroller ADCs and analog comparators in engine management systems. IC Role / Device Role / Timing Role: Shunt voltage reference regulating feedback node of LDOs powering MCU core logic. Use Value: ±2 % tolerance ensures consistent ADC full-scale calibration across temperature and lifetime, reducing field recalibration needs. | Use Scenario: Clamping 12 V supply rail during hot-swap insertion of USB-C powered infotainment modules. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing inrush-induced overshoot before it reaches PMIC inputs. Use Value: 40 W non-repetitive surge rating handles 100 µs spikes without degradation, preserving downstream SoC reliability. |
| ADAS Camera Module Biasing | Body Control Module (BCM) Wake-Up Detection |
Use Scenario: Generating precise bias voltage for CMOS image sensor analog front-end stages in rear-view cameras. IC Role / Device Role / Timing Role: Low-noise Zener reference supplying clean 12 V to sensor analog supply pins. Use Value: 2.5 pF capacitance avoids high-frequency coupling into sensitive imaging paths, maintaining SNR > 65 dB. | Use Scenario: Detecting battery voltage rise above 11.8 V to trigger BCM wake-up from sleep mode during ignition key turn-on. IC Role / Device Role / Timing Role: Threshold detector using Zener conduction to enable wake-up comparator input. Use Value: 100 nA leakage at 8 V ensures <1 µA total quiescent current in sleep state, extending vehicle battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C12-Q | ±5 % tolerance (vs. ±2 %); identical package, power rating, and thermal specs | Acceptable where 12 V ±0.6 V regulation suffices (e.g., non-critical biasing) | Select when cost sensitivity outweighs precision requirements and system-level calibration is available |
| MMSZ4689T1G | 12 V ±5 %, SOD-123 package, 500 mW Ptot, 350 Ω rdif | Higher power handling but larger footprint and looser tolerance; not AEC-Q101 qualified | Choose only for non-automotive industrial use requiring >275 mW dissipation in same thermal environment |
Compared with BZX84W-C12-Q, the BZX84W-B12-QF offers tighter regulation for feedback-critical circuits; versus MMSZ4689T1G, it trades power margin for automotive qualification and smaller SOT323 footprint-making it optimal for space- and reliability-constrained automotive modules.
Availability
BZX84W-B12-QF is available at Aetrix Electronics and suitable for automotive ECU design, ADAS camera biasing, and body control module voltage supervision requiring stable component supply across production lifecycles.
Supply support for BZX84W-B12-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 automotive Zener diode product line, engineered specifically for robust voltage regulation in harsh-temperature automotive subsystems where AEC-Q101 compliance and long-term parametric stability are mandatory.
FAQ
What is the maximum continuous reverse current the BZX84W-B12-QF can sustain at 25 °C ambient?
The device sustains up to 22.9 mA continuous reverse current at 25 °C ambient, calculated from its 275 mW power rating divided by 12 V Zener voltage. This assumes no additional thermal derating and standard FR4 PCB mounting per datasheet conditions.
Does the "n.c." pin require PCB routing or grounding?
No. Pin 2 is internally not connected and must remain unconnected on the PCB layout. Routing or grounding this pin introduces risk of solder bridging, parasitic capacitance, or mechanical stress that could compromise device reliability or measurement accuracy.
How does the 8.4 mV/K temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
Over that range, the Zener voltage shifts approximately ±0.7 V from nominal 12 V due to temperature coefficient drift. Combined with ±0.24 V tolerance, total variation remains within ±0.94 V-acceptable for non-precision biasing but requires compensation in high-accuracy references.
Can BZX84W-B12-QF replace older BZX84-C12 in existing designs?
Yes, with caveats: both regulate at 12 V, but BZX84W-B12-QF offers ±2 % tolerance (vs. ±5 %), lower capacitance (2.5 pF vs. ~4 pF), and AEC-Q101 qualification. Layout compatibility is confirmed via identical SOT323 footprint; verify thermal margin if operating near 275 mW limit.
BZX84W-B12-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):
- 12 V
- Tolerance:
- ±1.67%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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-B12-QF FAQ
1.How can I place an order for BZX84W-B12-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B12-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-B12-QF reliable?
The price and inventory of BZX84W-B12-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-B12-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B12-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B12-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B12-QF?
BZX84W-B12-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B12-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-B12-QF?
For technical support, including BZX84W-B12-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B12-QF requirements.
6.How does Aetrix verify that BZX84W-B12-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B12-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-B12-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B12-QF?
All BZX84W-B12-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B12-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-B12-QF part is unused and in its original packaging.
Return procedure for BZX84W-B12-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B12-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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