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Nexperia USA Inc. BZX79-C12,143
- Part No.:
- BZX79-C12,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C12,143.pdf
- Description:
- DIODE ZENER 12V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:3,256
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Product details
Overview
BZX79-C12,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 12 V breakdown voltage at 8 V reverse bias, 100 nA maximum reverse leakage, 50 Ω typical differential resistance at 5 mA test current, and 500 mW total power dissipation in DO-35 (SOD27) glass package - used for low-power voltage reference and stabilization in linear power supplies and sensor biasing circuits.
For engineers reviewing the BZX79-C12,143 datasheet, BZX79-C12,143 pinout, BZX79-C12,143 application, or BZX79-C12,143 equivalent, key selection criteria include Zener voltage tolerance, temperature coefficient (+6.0 mV/K), non-repetitive surge capability (85 A peak reverse current), thermal resistance (380 K/W), and hermetic glass packaging suitability for high-reliability industrial environments.
Technical Context
This device operates as a two-terminal passive voltage reference, relying on controlled avalanche or Zener breakdown in silicon PN junction under reverse bias. Its regulation behavior is defined by the knee of the IZ-VZ curve at IZtest = 5 mA, with differential resistance determining load regulation sensitivity.
Thermal performance is governed by junction-to-ambient thermal resistance (380 K/W) and tie-point resistance (300 K/W), limiting continuous power handling to 400 mW at 50 °C ambient and 500 mW at 50 °C with short leads. Non-repetitive surge rating (40 W, 100 μs square wave) supports transient overvoltage clamping in low-energy protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V to 12.7 V at IZ = 5 mA - defines stable reference point for biasing or regulation within ±5% tolerance band |
| Differential Resistance (rdif) | 50 Ω typical at IZ = 5 mA - determines output impedance and load regulation error under varying current draw |
| Reverse Leakage (IR) | 100 nA max at VR = 8 V - ensures minimal quiescent current in high-impedance reference nodes |
| Temperature Coefficient (SZ) | +6.0 mV/K typical - quantifies voltage drift per degree Celsius rise, critical for precision references across temperature |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C with 8 mm leads - sets maximum continuous DC power before thermal runaway risk |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs - enables brief overvoltage clamping without permanent damage |
| Junction Temperature Range | −65 °C to +200 °C - supports operation in extended industrial and automotive under-hood environments |
Pinout & Package
Hermetically sealed axial-leaded glass package per SOD27 (DO-35) standard: 4.25 mm body length, 1.85 mm diameter, 25.4 mm lead spacing, cathode indicated by black band. No active pin configuration - two-terminal device with anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common or lower potential side; establishes forward voltage drop (~0.9 V @ 10 mA) |
| Cathode | Zener breakdown terminal / regulated output node | Marked with black band; reverse-biased to develop stable 12 V reference relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required, e.g., LED biasing or coarse supply monitoring |
| Hermetic glass SOD27 package | Provides long-term stability and moisture resistance unmatched by plastic-packaged Zeners, critical for 15+ year industrial deployments |
| 100 nA reverse leakage at 8 V | Minimizes loading on high-impedance feedback networks, preserving accuracy in op-amp reference circuits |
| +6.0 mV/K temperature coefficient | Offers predictable, positive drift enabling compensation in dual-diode configurations or temperature-sensing applications |
| 40 W non-repetitive surge rating | Supports transient suppression in low-energy signal lines without requiring external TVS devices |
Applications
| Power Supply Reference | Sensor Biasing Circuit |
|---|---|
Use Scenario: Providing stable 12 V reference for adjustable linear regulators (e.g., LM317) in bench power supplies. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing setpoint for feedback loop. Use Value: Delivers ±5% regulation with <100 nA leakage, minimizing adjustment error and load-induced drift in low-current (<5 mA) reference paths. | Use Scenario: Biasing resistive temperature detectors (RTDs) or bridge sensors in industrial process transmitters. IC Role / Device Role / Timing Role: Precision DC excitation source maintaining constant voltage across sensor element. Use Value: Stable 12 V output with +6.0 mV/K tempco allows predictable offset correction in firmware, improving measurement repeatability over −40 °C to +85 °C. |
| Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Protecting analog input pins of microcontrollers against ESD or inductive kickback up to 40 W/100 μs. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing transient energy before IC damage occurs. Use Value: 40 W non-repetitive surge rating and 85 A peak reverse current enable single-device protection without series current limiting resistors in low-energy signal paths. | Use Scenario: Generating clean reset signal for 3.3 V or 5 V MCUs using resistor-divider and RC delay from 12 V rail. IC Role / Device Role / Timing Role: Stable voltage source feeding comparator or reset supervisor IC reference input. Use Value: Low 100 nA leakage prevents capacitor discharge during hold time, ensuring reliable reset assertion duration independent of supply ripple. |
Availability
BZX79-C12,143 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, overvoltage protection circuits, and MCU reset subsystems requiring stable component supply with long-lifecycle support.
Supply support for BZX79-C12,143 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 leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and consumer markets.
The BZX79 series was designed specifically for cost-sensitive, low-power voltage regulation and reference applications where hermetic reliability, stable tempco, and surge resilience outweigh the need for ultra-tight tolerance or surface-mount form factors.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX79-C12,143 has no specified maximum continuous reverse current - its safe operating limit is determined by power dissipation. At 12 V Zener voltage, continuous reverse current must be limited to ≤41.7 mA to stay within 500 mW Ptot, assuming ideal heat sinking. Derating applies above 50 °C ambient per Rth j-a = 380 K/W.
Is this diode suitable for use in automotive under-hood applications?
Yes - the BZX79-C12,143 is rated for junction temperatures from −65 °C to +200 °C and uses hermetic glass packaging resistant to thermal cycling and humidity. Its +6.0 mV/K temperature coefficient is well-documented and stable, supporting design margin analysis for AEC-Q200-compliant systems when combined with appropriate derating.
How does the ±5% tolerance affect circuit accuracy?
The ±5% tolerance means the actual Zener voltage falls between 11.4 V and 12.7 V at 5 mA. In precision applications, this introduces up to ±1.3 V absolute error. For non-critical biasing or clamping, it's acceptable; for accurate references, users must calibrate downstream or select the tighter ±2% BZX79-B12 variant.
Can this part replace the older Philips BZX79-C12?
Yes - BZX79-C12,143 is the direct Nexperia successor to the Philips/NXP BZX79-C12, retaining identical electrical specifications, SOD27 package dimensions, marking, and thermal characteristics. The "143" suffix denotes Nexperia's internal manufacturing code and does not indicate functional change.
BZX79-C12,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 400 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 ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-C12,143 FAQ
1.How can I place an order for BZX79-C12,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C12,143 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 BZX79-C12,143 reliable?
The price and inventory of BZX79-C12,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C12,143 is usually 5 days.
3.What payment methods are accepted for BZX79-C12,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C12,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C12,143?
BZX79-C12,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C12,143 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 BZX79-C12,143?
For technical support, including BZX79-C12,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C12,143 requirements.
6.How does Aetrix verify that BZX79-C12,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-C12,143 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 BZX79-C12,143 meets industry standards.
7.What is the process for return or replacement of BZX79-C12,143?
All BZX79-C12,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C12,143, 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 BZX79-C12,143 part is unused and in its original packaging.
Return procedure for BZX79-C12,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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