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Diodes Incorporated BZX84B12-7-F
- Part No.:
- BZX84B12-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B12-7-F.pdf
- Description:
- DIODE ZENER 12V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,195
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Product details
Overview
BZX84B12-7-F from Diodes Incorporated is a precision 12 V ±2% Zener diode in SOT23 package, rated for 350 mW power dissipation at 25°C ambient, with 25 Ω typical zener impedance at 5 mA test current and 0.1 µA maximum reverse leakage at 8.0 V. It serves as a stable voltage reference or overvoltage clamp in low-power analog and digital supply regulation circuits.
For engineers reviewing the BZX84B12-7-F datasheet, BZX84B12-7-F pinout, BZX84B12-7-F application, or BZX84B12-7-F equivalent, key selection criteria include its tight 12.0 V nominal zener voltage tolerance, AEC-Q101 qualification for automotive use, SOT23 surface-mount compatibility with automated assembly, and thermal resistance of 357 °C/W under lead-free soldering conditions.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified test current of 5.0 mA and maintains regulation across -65°C to +150°C junction temperature range. Its 12.0 V nominal zener voltage exhibits a +6.0 mV/°C temperature coefficient above 6 V, enabling predictable drift compensation in reference designs.
The device delivers 25 Ω dynamic impedance at IZT = 5 mA and 150 Ω at knee current IZK = 1.0 mA, supporting both precision regulation and low-current sensing roles. Its 350 mW power rating applies when terminals are held at ambient temperature, while derating begins above 40°C ambient per the published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V nominal, 11.8–12.2 V range at 5 mA - ensures stable reference within ±2% tolerance |
| Power Dissipation (PD) | 350 mW at TA = 25°C with terminals at ambient - defines maximum continuous clamping energy |
| Zener Impedance (ZZT) | 25 Ω at IZT = 5 mA - determines output voltage stability under load variation |
| Reverse Leakage (IR) | 0.1 µA max at VR = 8.0 V - guarantees minimal quiescent current in standby regulation |
| Temperature Coefficient | +6.0 mV/°C - enables predictable voltage drift correction in temperature-critical references |
| Package | SOT23 - supports high-density PCB layout and reflow-compatible automated placement |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability and stress endurance |
Pinout & Package
Package: SOT23 - three-terminal surface-mount plastic case with matte tin-plated alloy 42 leadframe, UL 94V-0 flammability rating, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 12 V reference when reverse-biased at ≥5 mA |
| No-Connect (Pin 3) | Internal die attach flag / mechanical support | Not electrically connected; used for thermal anchoring and mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision 12 V reference designs without recalibration |
| AEC-Q101 qualification | Validates suitability for automotive body electronics, infotainment power rails, and ADAS sensor biasing |
| 350 mW power rating with 357 °C/W RθJA | Supports compact thermal design in space-constrained modules without forced cooling |
| Halogen- and antimony-free "Green" construction | Meets RoHS 3 (2015/863/EU) and automotive ELV directive compliance requirements |
| SOT23 footprint compatibility | Allows drop-in integration into existing 0805-equivalent land patterns and pick-and-place workflows |
Applications
| Automotive Body Control Module (BCM) Voltage Clamp | Industrial Sensor Signal Conditioning Reference |
|---|---|
Use Scenario: Clamping transient spikes on 12 V battery-supplied microcontroller I/O lines in door module ECUs. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit input voltage to safe levels. Use Value: Prevents latch-up or ESD damage to MCU pins using its 12 V regulation and 0.1 µA leakage at 8 V. | Use Scenario: Providing stable 12 V reference for 16-bit ADC biasing in temperature-transmitter front-ends. IC Role / Device Role / Timing Role: Precision voltage reference source with ±2% tolerance and +6.0 mV/°C TC. Use Value: Enables <1 LSB error contribution over -40°C to +85°C operating range due to tight VZ tolerance and known TC. |
| USB-C Power Delivery (PD) Adapter Feedback Network | Smart Home Hub Power Rail Monitor |
Use Scenario: Setting feedback threshold in secondary-side TL431-based regulation loop for 12 V output rail. IC Role / Device Role / Timing Role: Zener reference in optocoupler feedback divider to maintain output accuracy. Use Value: Delivers 25 Ω dynamic impedance at 5 mA, minimizing regulation error from load-induced current variation. | Use Scenario: Monitoring 12 V DC input rail integrity before enabling Wi-Fi SoC power sequencing. IC Role / Device Role / Timing Role: Overvoltage protection element triggering shutdown logic at >12.2 V. Use Value: Guarantees trip point within 12.2 V upper limit due to ±2% VZ tolerance and 0.1 µA leakage below threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4687T1G | 12 V ±5%, 500 mW rating, SOD-123 package, 30 Ω ZZT | Higher power but looser tolerance and larger footprint | Select when higher surge energy handling is required and ±5% VZ is acceptable |
| BZX84-C12 | 12 V ±5%, same SOT23 package, 350 mW, no AEC-Q101 qualification | Lacks automotive qualification and tighter tolerance | Select for cost-sensitive industrial applications where AEC-Q101 is not mandated |
Compared with MMSZ4687T1G and BZX84-C12, BZX84B12-7-F provides superior voltage accuracy (±2% vs. ±5%), automotive qualification, and optimized thermal performance in SOT23 - making it preferred for safety-critical or high-precision 12 V reference roles.
Availability
BZX84B12-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning circuits, USB-C PD adapter feedback networks, and smart home hub power rail monitors requiring stable component supply and AEC-Q101 compliance.
Supply support for BZX84B12-7-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage regulation, reference, and overvoltage protection in automotive, industrial, and consumer power management systems.
FAQ
What is the maximum reverse leakage current for BZX84B12-7-F at 8.0 V?
The maximum reverse leakage current is 0.1 µA at VR = 8.0 V and TA = 25°C, as specified in the Electrical Characteristics table. This low leakage ensures minimal loading on bias networks and preserves accuracy in high-impedance reference applications.
Is BZX84B12-7-F suitable for automotive applications?
Yes - it is explicitly qualified to AEC-Q101 standards for high-reliability automotive use, including temperature cycling, humidity testing, and mechanical shock validation. The "Q" suffix variant (e.g., BZX84B12Q-7-F) denotes full automotive qualification, but the -7-F version shares identical die and qualification data per Diodes' documentation.
How does the temperature coefficient affect regulation accuracy over temperature?
With a +6.0 mV/°C temperature coefficient, the zener voltage increases by approximately 0.72 V from -40°C to +85°C ambient. Designers must account for this linear drift in precision references; however, its predictability allows for effective compensation in closed-loop systems.
What is the recommended pad layout for SOT23 mounting?
Diodes recommends a pad layout with X = 0.8 mm, Y = 0.9 mm, X1 = 1.35 mm, Y1 = 2.9 mm, and C = 2.0 mm (center-to-center). This matches JEDEC MO-215 standards and ensures reliable solder joint formation, thermal transfer, and mechanical stability during reflow.
BZX84B12-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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:
- 300 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B12-7-F FAQ
1.How can I place an order for BZX84B12-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B12-7-F 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 BZX84B12-7-F reliable?
The price and inventory of BZX84B12-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B12-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B12-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B12-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B12-7-F?
BZX84B12-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B12-7-F 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 BZX84B12-7-F?
For technical support, including BZX84B12-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B12-7-F requirements.
6.How does Aetrix verify that BZX84B12-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B12-7-F 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 BZX84B12-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B12-7-F?
All BZX84B12-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B12-7-F, 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 BZX84B12-7-F part is unused and in its original packaging.
Return procedure for BZX84B12-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B12-7-F Tags
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Diodes Incorporated
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Diodes Incorporated
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