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Nexperia USA Inc. BZX84W-C12-QX
- Part No.:
- BZX84W-C12-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C12-QX.pdf
- Description:
- DIODE ZENER 12.05V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,291
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Product details
Overview
BZX84W-C12-QX from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, rated for 12 V nominal regulation at 5 mA, with 150 Ω typical differential resistance, 8.4 mV/K temperature coefficient, and 275 mW total power dissipation - used for voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX84W-C12-QX datasheet, BZX84W-C12-QX pinout, BZX84W-C12-QX application, or BZX84W-C12-QX equivalent, this page delivers verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), reverse leakage (100 nA at 8 V), and SOT323 terminal mapping for precision circuit design and automotive-grade compliance validation.
Technical Context
This Zener operates in reverse breakdown mode with a nominal 12 V regulation voltage at IZ = 5 mA, exhibiting a positive temperature coefficient of +8.4 mV/K - indicating increasing Zener voltage with junction temperature rise. Its low 150 Ω differential resistance ensures stable regulation under load variation.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it sustains 200 mA maximum forward current and 40 W non-repetitive peak reverse power (100 µs pulse), while maintaining 150 °C maximum junction temperature and −55 °C to +150 °C ambient operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal at IZ = 5 mA; ±5% tolerance (11.4–12.7 V) defines regulation window for reference stability |
| Differential Resistance (rdif) | 150 Ω max at IZ = 5 mA; determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | +8.4 mV/K at IZ = 5 mA; quantifies drift rate per degree Celsius in automotive thermal environments |
| Reverse Leakage (IR) | 100 nA max at VR = 8 V; critical for low-power standby circuits and battery-backed systems |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4; sets continuous DC power limit without heatsinking |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W; defines temperature rise per watt on unmodified PCB layout |
| Package | SOT323 (SC-70); 3-terminal leadless SMD footprint compatible with automated reflow assembly |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 terminals: compact 2.2 mm × 1.35 mm body, 0.65 mm pitch, and tin-plated terminations for RoHS-compliant reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and provides regulated output reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains |
| ±5% Zener voltage tolerance | Enables cost-effective voltage clamping where tight regulation is not required |
| Low 100 nA reverse leakage at 8 V | Minimizes quiescent current in always-on monitoring circuits |
| 150 °C maximum junction temperature | Supports operation in under-hood environments without derating below 125 °C ambient |
| SOT323 footprint compatibility | Enables high-density placement alongside microcontrollers and PMICs on space-constrained boards |
Applications
| Automotive ECU Reference | Industrial Sensor Biasing |
|---|---|
Use Scenario: Providing stable 12 V reference for analog-to-digital conversion in engine control modules. IC Role / Device Role / Timing Role: Zener voltage reference for ADC input scaling and supply rail monitoring. Use Value: Maintains ±5% accuracy across −40 °C to +125 °C ambient, enabling reliable sensor data acquisition without external trimming. |
Use Scenario: Biasing precision current sources in 4–20 mA industrial transmitters. IC Role / Device Role / Timing Role: Stable shunt reference establishing known voltage drop across sense resistor. Use Value: 150 Ω differential resistance limits output voltage shift to <15 mV under 100 µA load variation, preserving loop accuracy. |
| USB Port Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping transient surges on 5 V USB VBUS lines in automotive infotainment systems. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting ESD and load dump energy. Use Value: 40 W non-repetitive peak power rating absorbs 100 µs pulses without degradation, meeting ISO 16750-2 surge requirements. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M MCUs during brown-out conditions. IC Role / Device Role / Timing Role: Precision voltage detector element in RC-based reset generator. Use Value: 100 nA reverse leakage prevents capacitor discharge delay, ensuring sub-millisecond reset assertion timing 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-C12-Q | Same electrical specs and SOT323 package; differs only in marking code (R6% vs QX) and traceability batch coding | No functional difference; identical AEC-Q101 qualification and thermal performance | Select when full Nexperia traceability documentation is not required |
| MMSZ5242B-TP | 12 V ±5%, but 500 mW Ptot, 100 Ω rdif, and SOD-123 package - larger footprint and higher power capability | Better suited for higher-current regulation (>10 mA) or less thermally constrained layouts | Choose for non-automotive designs needing marginally tighter regulation or higher surge tolerance |
Compared with BZX84W-C12-QX, the BZX84W-C12-Q offers identical performance with alternate traceability, while MMSZ5242B-TP trades SOT323 miniaturization for higher power handling and lower dynamic impedance - making the QX variant optimal for space-limited automotive modules requiring certified reliability.
Availability
BZX84W-C12-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor signal conditioning, and USB power protection requiring stable component supply with AEC-Q101 assurance and SOT323 footprint compatibility.
Supply support for BZX84W-C12-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 advanced packaging.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in harsh automotive and industrial environments.
FAQ
What is the maximum reverse voltage before breakdown for BZX84W-C12-QX?
The nominal Zener voltage is 12 V at 5 mA test current, with a guaranteed range of 11.4 V to 12.7 V due to ±5% tolerance. Breakdown begins near the lower end of this range; operation below 11.4 V yields negligible reverse current (<100 nA at 8 V), while stable regulation occurs above 11.4 V under specified bias conditions.
Is BZX84W-C12-QX suitable for high-frequency decoupling?
No - it is not designed for high-frequency decoupling. With 2.5 pF junction capacitance at 0 V and no specified RF performance, its primary function is DC voltage regulation and low-speed transient clamping. For RF bypass, dedicated ceramic capacitors or RF-rated TVS diodes are required.
How does the "QX" suffix differ from "Q" in BZX84W-C12-QX?
The "QX" suffix denotes an enhanced traceability version with additional manufacturing lot and wafer-level tracking codes, while retaining identical electrical specifications, AEC-Q101 qualification, SOT323 package, and thermal characteristics as the base "Q" variant. Both meet the same automotive reliability standards.
Can BZX84W-C12-QX replace a 1N4742A in existing designs?
No - direct replacement is not recommended. The 1N4742A uses DO-41 through-hole packaging (1 W Ptot, 22 Ω rdif), whereas BZX84W-C12-QX is SOT323 (275 mW, 150 Ω rdif). Differences in power handling, thermal path, and dynamic impedance require layout and bias network redesign for equivalent performance.
BZX84W-C12-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):
- 12.05 V
- Tolerance:
- ±5.39%
- 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-C12-QX FAQ
1.How can I place an order for BZX84W-C12-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C12-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-C12-QX reliable?
The price and inventory of BZX84W-C12-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-C12-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C12-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C12-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C12-QX?
BZX84W-C12-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C12-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-C12-QX?
For technical support, including BZX84W-C12-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C12-QX requirements.
6.How does Aetrix verify that BZX84W-C12-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C12-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-C12-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C12-QX?
All BZX84W-C12-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C12-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-C12-QX part is unused and in its original packaging.
Return procedure for BZX84W-C12-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C12-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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