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onsemi BZX55C12_T50A
- Part No.:
- BZX55C12_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C12_T50A.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,979
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Product details
Overview
BZX55C12_T50A from Fairchild Semiconductor is a 12 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C with 20 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 9.5 V. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C12_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, junction temperature range, and DO-35 mechanical compatibility in space-constrained analog designs.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 12 V nominal zener voltage is specified at 5 mA test current with ±5% tolerance, and it maintains stable regulation across -65°C to +200°C operating temperature range.
The BZX55C12_T50A exhibits 20 Ω dynamic impedance (ZZ) at IZ = 5 mA and supports up to 32 mA maximum zener current (IZM) at 12.7 V, with 4.0 mW/°C linear derating above 75°C ambient lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V min / 12.7 V max at 5 mA - defines usable regulation window under standard test conditions |
| Tolerance | ±5% - ensures predictable voltage accuracy without post-selection trimming |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 20 Ω @ IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 0.1 μA @ VR = 9.5 V - confirms minimal standby current in undervoltage clamp configurations |
| Max Zener Current (IZM) | 32 mA @ VZ = 12.7 V - establishes safe peak current limit under worst-case regulation conditions |
| Junction Temp Range | -65°C to +200°C - enables deployment in automotive under-hood and industrial high-temp environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked end; connects to higher-potential node to enable voltage clamping or regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Eliminates need for external calibration in cost-sensitive voltage reference designs |
| DO-35 glass package | Enables manual insertion and wave soldering while maintaining hermetic reliability |
| 200°C max junction temperature | Supports operation in high-ambient environments without derating penalties |
| 500 mW power rating | Provides sufficient headroom for transient overvoltage suppression in signal-line protection |
| 0.1 μA IR at 9.5 V | Minimizes quiescent current draw in battery-powered voltage monitor circuits |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Stable 12 V reference for rail-to-rail op-amp input bias networks in industrial transmitters. IC Role / Device Role / Timing Role: Zener diode providing fixed reference potential independent of supply ripple. Use Value: Maintains 11.4–12.7 V regulation with <20 Ω impedance, ensuring <10 mV shift under 1 mA load variation. | Use Scenario: Clamping 12 V sensor supply line against ESD or load-dump transients in automotive cabin sensors. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground during overvoltage events. Use Value: Activates at 11.4 V with 32 mA IZM capability, limiting excursion to ≤12.7 V under 400 mW surge. |
| Low-Power Microcontroller Reset Circuit | ADC Reference Stabilization |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using resistor-divider + Zener feedback. IC Role / Device Role / Timing Role: Precision voltage threshold element defining logic-high reset release point. Use Value: ±5% tolerance ensures consistent 11.4–12.7 V trip point across production lots without trimming. | Use Scenario: Stabilizing reference voltage for 12-bit SAR ADCs in portable data loggers. IC Role / Device Role / Timing Role: Low-noise DC reference source decoupled from noisy digital supply rails. Use Value: 0.1 μA IR and 20 Ω ZZ minimize reference drift and noise coupling into ADC reference pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | Same 12 V nominal, but ±5% tolerance and 1 Ω higher ZZ (21 Ω) | Identical DO-41 package; requires PCB pad revision due to longer body and larger diameter | Select when legacy DO-41 footprint exists and 1 Ω ZZ difference is acceptable |
| MMSZ5242B | Same 12 V nominal and ±5%, but SOD-123 surface-mount package and 500 mW rating at 25°C only | Requires rework for automated pick-and-place; unsuitable for through-hole prototyping | Select for space-constrained PCBs where DO-35 axial insertion is impractical |
Compared with 1N4742A and MMSZ5242B, the BZX55C12_T50A offers DO-35 axial compatibility with verified 500 mW rating at 75°C lead temperature and tighter thermal derating control-critical for thermally dense analog assemblies.
Availability
BZX55C12_T50A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, microcontroller reset, and ADC stabilization applications requiring stable component supply across industrial, automotive, and instrumentation programs.
Supply support for BZX55C12_T50A 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55 series was designed as a general-purpose, cost-optimized Zener diode family for precision voltage regulation and transient suppression in consumer, industrial, and automotive electronics.
FAQ
What is the exact zener voltage range for BZX55C12_T50A at 25°C?
The BZX55C12_T50A has a guaranteed zener voltage range of 11.4 V to 12.7 V at 5 mA test current and 25°C ambient, per Fairchild's Rev. D1 datasheet. This ±5% tolerance reflects manufacturing spread and ensures predictable performance without binning or calibration. The BZX55C12_T50A achieves this specification using controlled diffusion processes in planar silicon technology.
Does BZX55C12_T50A support operation above 100°C ambient?
Yes, the BZX55C12_T50A is rated for junction temperatures from -65°C to +200°C, and its power dissipation remains valid up to 75°C lead temperature. Above that, linear derating of 4.0 mW/°C applies-so at 100°C lead temperature, usable power drops to 400 mW. The BZX55C12_T50A maintains regulation integrity throughout this range without parameter shift or failure.
What is the maximum reverse leakage current for BZX55C12_T50A?
The BZX55C12_T50A specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 9.5 V and 25°C. This value is measured under standardized test conditions and confirms minimal standby current in clamp or reference roles. At elevated temperatures (e.g., 125°C), IR rises to 1 μA-still negligible for most low-power applications using the BZX55C12_T50A.
Is BZX55C12_T50A compatible with wave soldering processes?
Yes, the DO-35 glass package of the BZX55C12_T50A is qualified for wave soldering with standard 3/8" lead length and thermal profiles compliant with IPC-J-STD-020. Peak temperatures up to 260°C for ≤10 seconds are supported. The BZX55C12_T50A's glass-body construction prevents moisture-induced cracking during reflow, unlike some plastic-packaged Zeners.
How does dynamic impedance affect regulation accuracy in BZX55C12_T50A?
The BZX55C12_T50A has a typical dynamic impedance (ZZ) of 20 Ω at 5 mA, meaning a 1 mA change in zener current causes ~20 mV output shift. This directly impacts regulation stability under varying load conditions. For example, in a 12 V reference circuit delivering 2 mA, the BZX55C12_T50A's ZZ contributes <50 mV total error-critical for 12-bit ADC references where ±0.5% accuracy is required.
BZX55C12_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 9 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX55C12_T50A FAQ
1.How can I place an order for BZX55C12_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C12_T50A 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 BZX55C12_T50A reliable?
The price and inventory of BZX55C12_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C12_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C12_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C12_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C12_T50A?
BZX55C12_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C12_T50A 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 BZX55C12_T50A?
For technical support, including BZX55C12_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C12_T50A requirements.
6.How does Aetrix verify that BZX55C12_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C12_T50A 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 BZX55C12_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C12_T50A?
All BZX55C12_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C12_T50A, 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 BZX55C12_T50A part is unused and in its original packaging.
Return procedure for BZX55C12_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C12_T50A Tags
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