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Nexperia USA Inc. BZX84-B12/DG/B4R
- Part No.:
- BZX84-B12/DG/B4R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B12/DG/B4R.pdf
- Description:
- DIODE ZENER 12V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,614
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Product details
Overview
BZX84-B12/DG/B4R from Nexperia is a surface-mount 12 V Zener diode with 250 mW power dissipation, ±2% voltage tolerance, and 5 µA maximum reverse leakage at 9.1 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84-B12/DG/B4R datasheet, BZX84-B12/DG/B4R pinout, BZX84-B12/DG/B4R application, or BZX84-B12/DG/B4R equivalent, key selection criteria include Zener voltage accuracy, thermal stability in SOT23 packages, low leakage performance under bias, and compatibility with automated PCB assembly processes.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 12 V reference across its terminals under specified current conditions (Iz = 5 mA). Its dynamic impedance is 25 Ω at 5 mA, ensuring minimal output voltage variation with load changes.
The device features a junction temperature range of –65 °C to +150 °C and a typical thermal resistance of 500 K/W (junction-to-ambient), enabling reliable operation in compact, unheatsinked designs without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 12 V ±2% at Iz = 5 mA - ensures tight regulation for reference-sensitive circuits |
| Power Dissipation (Ptot) | 250 mW - limits maximum continuous power in SOT23 footprint without forced cooling |
| Reverse Leakage (IR) | ≤5 µA at VR = 9.1 V - minimizes standby current in battery-powered voltage clamp stages |
| Dynamic Impedance (Zz) | 25 Ω at Iz = 5 mA - determines output voltage ripple sensitivity to current transients |
| Junction Temperature Range | –65 °C to +150 °C - supports operation in automotive under-hood and industrial control environments |
| Package | SOT23 - enables high-density placement and reflow-compatible assembly on standard PCBs |
Pinout & Package
SOT23 package with three terminals: anode (Pin 1), cathode (Pin 2), and unused terminal (Pin 3) - Pin 3 is internally unconnected and must remain floating per Nexperia's mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; reverse-biased during Zener operation |
| Pin 2 | Cathode | Connected to higher-potential node; defines regulated output reference point |
| Pin 3 | NC | No internal connection; must not be soldered or tied to any net |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct use in 12 V rail monitoring without external trimming resistors |
| Low 5 µA reverse leakage | Reduces quiescent current in always-on protection circuits by >90% vs. ±5% grade parts |
| SOT23 package with AEC-Q200 qualification | Supports automotive-grade reliability in engine control and body electronics modules |
| 250 mW power rating at TJ ≤ 150 °C | Permits sustained clamping in transient overvoltage events up to 100 ms duration |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
|---|---|
Use Scenario: Stabilizing 12 V reference for analog front-end amplifiers in pressure and temperature sensors. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp for ADC input protection. Use Value: Maintains ±0.24 V regulation window over temperature, reducing sensor calibration drift. | Use Scenario: Protecting microcontroller I/O pins from load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Reverse-biased clamping diode shunting surge energy to ground. Use Value: Limits pin voltage to 12.24 V peak, preventing latch-up in 5 V tolerant GPIOs. |
| USB-C Power Delivery Adapter | Smart Home Hub Power Management |
Use Scenario: Providing precise 12 V feedback reference for secondary-side regulation in flyback converters. IC Role / Device Role / Timing Role: Voltage reference element in optocoupler feedback loop. Use Value: Achieves ±1.5% output voltage accuracy across line/load/temperature without trim potentiometer. | Use Scenario: Regulating auxiliary 12 V rail for Zigbee/Thread radio modules in battery-backed hubs. IC Role / Device Role / Timing Role: Low-leakage voltage clamp maintaining stable supply during deep-sleep modes. Use Value: Draws only 5 µA in standby, extending 2xAA battery life beyond 18 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12,115 | ±5% tolerance, 250 mW, same SOT23 package | Higher voltage variation reduces accuracy in reference-critical circuits | Select when cost priority outweighs regulation precision |
| MMSZ4687T1G | 12 V ±5%, 500 mW, SOD-123 package | Larger footprint and higher power rating suit higher-energy clamping | Choose for surge-heavy environments where thermal margin is critical |
Compared with BZX84-C12,115, this part delivers tighter voltage control at identical cost; versus MMSZ4687T1G, it offers superior board-area efficiency and lower leakage but reduced single-pulse energy handling.
Availability
BZX84-B12/DG/B4R is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, USB-C power adapters, and smart home hub power management requiring stable component supply and long-term manufacturability.
Supply support for BZX84-B12/DG/B4R 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.
This part belongs to the BZX84 series of precision Zener diodes designed specifically for voltage reference and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the maximum reverse current before breakdown for BZX84-B12/DG/B4R?
The device exhibits ≤5 µA reverse leakage at 9.1 V (0.75 × Vz); breakdown begins at approximately 11.2 V, with full Zener conduction established at 5 mA test current. No guaranteed minimum breakdown voltage is specified below 11.2 V per Nexperia's datasheet Figure 4.
Can BZX84-B12/DG/B4R be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched Vz tolerances, causing current hogging and thermal runaway when paralleled. For higher power, select a single higher-rated device such as PZM12NB or use active regulation instead.
Is Pin 3 electrically connected inside the SOT23 package?
No - Pin 3 is a mechanical tie-bar with no internal bond wire or silicon connection. Nexperia's package drawing explicitly labels it "NC" and requires it to remain unconnected on the PCB to avoid parasitic coupling or mechanical stress.
Does this Zener diode meet AEC-Q200 requirements?
Yes - BZX84-B12/DG/B4R is qualified to AEC-Q200 Rev D for passive components, including temperature cycling, humidity bias, and mechanical shock testing, and is listed in Nexperia's official AEC-Q200 qualified parts list (QPL) under product status "Qualified".
BZX84-B12/DG/B4R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 250 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:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-B12/DG/B4R FAQ
1.How can I place an order for BZX84-B12/DG/B4R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B12/DG/B4R 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 BZX84-B12/DG/B4R reliable?
The price and inventory of BZX84-B12/DG/B4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B12/DG/B4R is usually 5 days.
3.What payment methods are accepted for BZX84-B12/DG/B4R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B12/DG/B4R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B12/DG/B4R?
BZX84-B12/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B12/DG/B4R 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 BZX84-B12/DG/B4R?
For technical support, including BZX84-B12/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B12/DG/B4R requirements.
6.How does Aetrix verify that BZX84-B12/DG/B4R is sourced from the original manufacturer or authorized distributors?
All BZX84-B12/DG/B4R 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 BZX84-B12/DG/B4R meets industry standards.
7.What is the process for return or replacement of BZX84-B12/DG/B4R?
All BZX84-B12/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B12/DG/B4R, 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 BZX84-B12/DG/B4R part is unused and in its original packaging.
Return procedure for BZX84-B12/DG/B4R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B12/DG/B4R Tags
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