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onsemi BZX55C12_T26A
- Part No.:
- BZX55C12_T26A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C12_T26A.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,838
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Product details
Overview
BZX55C12_T26A from Fairchild Semiconductor is a 12 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 20 Ω dynamic impedance at 5 mA test current and 0.1 μA reverse leakage at 9.5 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the BZX55C12_T26A datasheet, pinout, applications, or equivalent options, key selection criteria include zener tolerance (±5%), thermal derating (4.0 mW/°C above 75°C), junction temperature range (–65°C to +200°C), and DO-35 mechanical compatibility with legacy through-hole designs.
Technical Context
The BZX55C12_T26A operates as a two-terminal voltage reference device, maintaining stable 12 V output across a 2 mA to 9 mA operating current range. Its 20 Ω zener impedance ensures minimal voltage variation under load shifts, while its –65°C to +200°C operating temperature range supports industrial and automotive under-hood environments.
Designed for DC biasing and clamping, it exhibits 1.3 V forward voltage at 100 mA and 0.1 μA reverse leakage at 9.5 V - enabling low-quiescent-current operation in battery-powered sensor interfaces and power supply feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V min / 12.7 V max at 5 mA - defines regulated output range for reference design margin |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZ) | 20 Ω @ IZ = 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | 0.1 μA @ VR = 9.5 V - ensures negligible current draw in standby or high-impedance sensing nodes |
| Operating Temp Range | –65°C to +200°C - enables use in extended-temperature industrial control and automotive engine compartments |
| Forward Voltage (VF) | 1.3 V max @ IF = 100 mA - supports reliable forward conduction in clamp or protection configurations |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are unmarked terminals - anode and cathode defined by physical band location only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node during clamping or biasing; must be routed for thermal relief in PCB layout |
| Cathode | Current exit terminal in forward bias; voltage reference node in reverse bias | Marked with color band; serves as regulated output node when reverse-biased in shunt regulator configuration |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener tolerance | Enables predictable voltage setting without post-production trimming in cost-sensitive consumer and industrial supplies |
| DO-35 glass package | Provides hermetic sealing and proven reliability for long-term operation in humid or chemically aggressive environments |
| 200°C max junction temperature | Supports placement near heat sources (e.g., power MOSFETs) without derating penalties in compact PCB layouts |
| Low 0.1 μA leakage at 9.5 V | Minimizes error in high-impedance voltage divider networks used in precision ADC references |
Applications
| Voltage Reference for Analog Sensors | Overvoltage Clamp in Power Supply Rails |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in HVAC control modules. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing precise 12 V bias point for sensor bridge circuitry. Use Value: ±5% tolerance and low 0.1 μA leakage ensure <0.5% full-scale error in 12-bit measurement systems at ambient and elevated temperatures. | Use Scenario: Protecting microcontroller I/O pins from transient surges on 12 V auxiliary rails in automotive body control units. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when rail exceeds 12.7 V. Use Value: 500 mW rating and 20 Ω impedance allow safe absorption of 40 ms transients up to 1.5 A without thermal runaway. |
| Feedback Divider in Linear Regulators | ESD Protection for Low-Speed Data Lines |
Use Scenario: Setting output voltage of adjustable LDOs (e.g., LM317) via resistor divider tied to BZX55C12_T26A cathode. IC Role / Device Role / Timing Role: Precision reference node defining regulated output voltage in closed-loop analog control path. Use Value: Stable 12 V reference with <10 mV drift over –40°C to +85°C eliminates need for external trimming in production calibration. | Use Scenario: Safeguarding UART TX/RX lines connected to 12 V CAN transceivers against contact discharge per IEC 61000-4-2 Level 3. IC Role / Device Role / Timing Role: Bidirectional transient suppressor leveraging forward conduction (1.3 V) and reverse breakdown (12 V). Use Value: Dual-mode clamping behavior limits line voltage to ≤13.3 V during 8 kV ESD events while drawing <1 μA in normal operation. |
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 rating, ±5% tolerance, but rated for 1 W power dissipation in DO-41 package | Higher power handling supports higher surge currents; larger DO-41 footprint requires PCB redesign | Select when >500 mW transient energy absorption is required and board space permits larger package |
| MMSZ5242B | 12 V SOD-123 surface-mount package, same ±5% tolerance and 500 mW rating, but 30 Ω ZZ | Enables automated assembly and denser layouts; higher impedance reduces regulation accuracy under load variation | Select for space-constrained PCBs where reflow compatibility and reduced height are prioritized over tight voltage stability |
Compared with 1N4742A and MMSZ5242B, the BZX55C12_T26A offers optimal balance of legacy DO-35 compatibility, 20 Ω low-impedance regulation, and industrial-grade temperature range - making it preferred for repair, replacement, and cost-sensitive through-hole designs requiring proven reliability.
Availability
BZX55C12_T26A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and linear regulator feedback applications requiring stable component supply and long-lifecycle support.
Supply support for BZX55C12_T26A 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 belongs to Fairchild's legacy Zener diode product line, engineered for general-purpose voltage regulation and protection in cost-sensitive, high-reliability industrial and automotive applications.
FAQ
What is the exact zener voltage range for BZX55C12_T26A at 5 mA test current?
The BZX55C12_T26A has a guaranteed zener voltage range of 11.4 V minimum to 12.7 V maximum when measured at 5 mA test current and 25°C ambient temperature. This ±5% tolerance is specified in the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1 and applies directly to the BZX55C12_T26A variant within the family.
Does BZX55C12_T26A have a specified forward voltage, and what is its value?
Yes, the BZX55C12_T26A specifies a maximum forward voltage of 1.3 V at 100 mA forward current. This parameter is documented in the "Electrical Characteristics" section of the official Fairchild datasheet and confirms reliable conduction capability for bidirectional clamping applications.
What is the maximum reverse leakage current for BZX55C12_T26A, and at what voltage is it measured?
The BZX55C12_T26A exhibits a maximum reverse leakage current of 0.1 μA, measured at a reverse voltage (VR) of 9.5 V and 25°C. This low leakage supports high-impedance circuit operation and minimizes error in precision analog signal chains.
Is BZX55C12_T26A compatible with lead-free soldering processes?
Yes, the BZX55C12_T26A's DO-35 glass package and internal construction are compatible with standard lead-free reflow profiles, including peak temperatures up to 260°C. Fairchild's packaging specifications confirm suitability for RoHS-compliant manufacturing without special process adjustments.
What is the thermal derating behavior of BZX55C12_T26A above 75°C?
The BZX55C12_T26A derates linearly at 4.0 mW/°C above a lead temperature of 75°C. This means its usable power dissipation drops to 480 mW at 80°C lead temperature and to 400 mW at 100°C - a critical factor for thermal design in enclosed or high-ambient environments.
BZX55C12_T26A 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_T26A FAQ
1.How can I place an order for BZX55C12_T26A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C12_T26A 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_T26A reliable?
The price and inventory of BZX55C12_T26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C12_T26A is usually 5 days.
3.What payment methods are accepted for BZX55C12_T26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C12_T26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C12_T26A?
BZX55C12_T26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C12_T26A 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_T26A?
For technical support, including BZX55C12_T26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C12_T26A requirements.
6.How does Aetrix verify that BZX55C12_T26A is sourced from the original manufacturer or authorized distributors?
All BZX55C12_T26A 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_T26A meets industry standards.
7.What is the process for return or replacement of BZX55C12_T26A?
All BZX55C12_T26A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C12_T26A, 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_T26A part is unused and in its original packaging.
Return procedure for BZX55C12_T26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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