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Nexperia USA Inc. BZX79-B12,133
- Part No.:
- BZX79-B12,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B12,133.pdf
- Description:
- DIODE ZENER 12V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:32,711
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Product details
Overview
BZX79-B12,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, designed for low-power voltage reference and stabilization at 12 V nominal Zener voltage with 50 Ω typical differential resistance and 6.0 mW non-repetitive peak reverse power dissipation capability. It operates with 100 nA reverse current at 8 V reverse bias and supports precision analog circuits requiring stable DC references.
For engineers reviewing the BZX79-B12,133 datasheet, BZX79-B12,133 pinout, BZX79-B12,133 application, or BZX79-B12,133 equivalent, this device serves as a primary voltage reference in linear regulators, overvoltage protection clamps, and sensor biasing networks where tight tolerance, low leakage, and thermal stability are critical.
Technical Context
This Zener diode functions as a two-terminal shunt voltage regulator, maintaining a stable 12 V output across its terminals when reverse-biased above its breakdown threshold. Its operation relies on controlled avalanche and Zener mechanisms, with temperature coefficient of +6.0 mV/K at IZ = 5 mA and junction-to-ambient thermal resistance of 380 K/W under standard PCB mounting conditions.
The device exhibits 50 Ω typical differential resistance at 5 mA test current, enabling predictable regulation slope and low dynamic impedance in feedback paths. Its 400 mW total power dissipation at Tamb = 50 °C and 40 W non-repetitive peak reverse power rating support transient surge suppression in low-energy circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.80–12.20 V at IZ = 5 mA - ensures precise 12 V reference within ±2% tolerance for calibration-critical circuits |
| Differential Resistance (rdif) | 50 Ω typ., 150 Ω max. at IZ = 5 mA - defines regulation linearity and load-induced voltage deviation |
| Reverse Current (IR) | 100 nA max. at VR = 8 V - minimizes standby power loss and leakage-induced error in high-impedance reference nodes |
| Total Power Dissipation (Ptot) | 500 mW max. at Tamb = 50 °C - sets continuous DC power handling limit for steady-state regulation |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W at tp = 100 μs - enables short-duration transient clamping without device failure |
| Temperature Coefficient (SZ) | +6.0 mV/K typ. at IZ = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Junction-to-Ambient Thermal Resistance | 380 K/W - determines steady-state temperature rise above ambient under given power dissipation |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; lead diameter 0.56 mm, body length 4.25 mm, overall length 25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation; carries forward current up to 250 mA |
| Cathode | Zener breakdown terminal / high-side connection | Marked by band; connected to regulated voltage node; sustains reverse breakdown at 12 V with controlled dynamic impedance |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision reference designs without recalibration or resistor trimming |
| Hermetic glass SOD27 package | Provides long-term reliability and moisture resistance in industrial environments with operating temperatures from −65 °C to +200 °C |
| Low 100 nA reverse leakage at 8 V | Reduces error contribution in high-impedance voltage divider and op-amp reference inputs |
| 50 Ω typical differential resistance | Ensures stable regulation under varying load currents, critical for feedback loop stability in LDOs |
| 40 W non-repetitive surge rating | Supports ESD and inductive kick protection in sensor interface and microcontroller I/O conditioning |
Applications
| Power Supply Reference | Sensor Biasing Network |
|---|---|
Use Scenario: Providing stable 12 V reference for adjustable linear regulators (e.g., LM317-based supplies) and feedback dividers. IC Role / Device Role / Timing Role: Shunt voltage reference establishing output setpoint via resistive divider. Use Value: ±2% tolerance eliminates need for external trim potentiometers; 50 Ω rdif maintains regulation accuracy across 1–10 mA load variations. | Use Scenario: Biasing resistive temperature detectors (RTDs) and bridge sensors in industrial measurement front-ends. IC Role / Device Role / Timing Role: Precision DC excitation source delivering stable 12 V to sensor elements. Use Value: 100 nA leakage prevents measurement offset errors in picoamp-level bridge outputs; hermetic package ensures long-term drift stability. |
| Overvoltage Clamp | Microcontroller I/O Protection |
Use Scenario: Clamping transient surges on 12 V rail inputs in automotive body control modules. IC Role / Device Role / Timing Role: Passive shunt protector absorbing energy spikes exceeding 12 V threshold. Use Value: 40 W non-repetitive rating handles ISO 7637-2 pulse 1/2a transients; 380 K/W Rth j-a allows safe dissipation without heatsinking. | Use Scenario: Protecting GPIO pins of ARM Cortex-M microcontrollers against ESD and bus overvoltage. IC Role / Device Role / Timing Role: Low-capacitance (≈15 pF) Zener clamp limiting pin voltage to 12 V. Use Value: 15 pF diode capacitance avoids signal integrity degradation on 1–10 MHz digital lines; fast response enables sub-100 ns clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B,215 | Surface-mount SOT-23 package; 12 V ±5%; 10 Ω rdif; 200 mW Ptot | Lower power, higher density layout; unsuitable for through-hole legacy designs | Select for space-constrained PCBs where reflow compatibility and smaller footprint are prioritized over through-hole serviceability |
| 1N4742A | DO-41 package; 12 V ±5%; 22 Ω rdif; 1 W Ptot | Higher power rating but looser tolerance; larger mechanical footprint | Select for higher continuous power needs (>500 mW) where ±5% tolerance is acceptable in cost-sensitive consumer applications |
Compared with MMBZ5242B,215 and 1N4742A, BZX79-B12,133 offers tighter ±2% tolerance and hermetic glass reliability ideal for industrial calibration and long-life embedded systems, while trading off SMT compatibility and higher power headroom.
Availability
BZX79-B12,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and precision power supply reference designs requiring stable component supply and long-term traceability.
Supply support for BZX79-B12,133 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, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-reliability, high-volume components.
The BZX79 series belongs to Nexperia's precision Zener voltage regulator product line, engineered for stable DC reference and low-power stabilization in cost-sensitive yet reliability-critical applications.
FAQ
What is the maximum continuous power dissipation for BZX79-B12,133 at 50 °C ambient?
The maximum continuous power dissipation is 500 mW when mounted on a PCB without metallization pad and with lead length ≤ 8 mm at Tamb = 50 °C. This rating assumes tie-point temperature ≤ 50 °C and is derated linearly above that temperature per the datasheet's thermal characteristics curve.
Does BZX79-B12,133 have a specified Zener impedance at 1 kHz?
No - the datasheet specifies differential resistance (rdif) at DC test conditions (IZ = 5 mA), not AC impedance. At 1 kHz, impedance is dominated by rdif since diode capacitance is only ~15 pF, yielding an effective impedance near 50 Ω across audio and low-speed signal frequencies.
Can BZX79-B12,133 be used in series to achieve higher reference voltages?
Yes - multiple BZX79-B12,133 diodes may be connected in series to generate higher reference voltages (e.g., 24 V with two units), but tolerance accumulates (±2.8% for two), and thermal coupling must be managed to avoid mismatched temperature coefficients affecting stability.
Is the cathode band polarity consistent across all SOD27-packaged Nexperia Zeners?
Yes - the black band on the SOD27 glass body always denotes the cathode terminal across the entire BZX79 series, including BZX79-B12,133. This marking aligns with JEDEC DO-35 standards and is verified in Nexperia's package outline documentation (SOD27, version A24).
BZX79-B12,133 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:
- ±2%
- 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-B12,133 FAQ
1.How can I place an order for BZX79-B12,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B12,133 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-B12,133 reliable?
The price and inventory of BZX79-B12,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B12,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B12,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B12,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B12,133?
BZX79-B12,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B12,133 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-B12,133?
For technical support, including BZX79-B12,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B12,133 requirements.
6.How does Aetrix verify that BZX79-B12,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B12,133 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-B12,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B12,133?
All BZX79-B12,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B12,133, 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-B12,133 part is unused and in its original packaging.
Return procedure for BZX79-B12,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B12,133 Tags
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