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onsemi 1N969B_T50A
- Part No.:
- 1N969B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N969B_T50A.pdf
- Description:
- DIODE ZENER 22V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,551
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Product details
Overview
1N969B_T50A from Fairchild Semiconductor is a 22V, 5% tolerance, 500mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications at 5.6mA test current, with 14Ω dynamic impedance and 0.25μA reverse leakage at 17.1V. It operates across -65°C to +200°C and supports stable biasing in analog power supplies and sensor conditioning circuits.
For engineers reviewing the 1N969B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (22V), power rating (500mW), Zener impedance (14Ω), reverse leakage (0.25μA @ 17.1V), and DO-35 glass package compatibility with through-hole PCB assembly.
Technical Context
The 1N969B_T50A functions as a two-terminal voltage reference device where breakdown occurs via controlled Zener effect and avalanche mechanisms near 22V. Its 5% tolerance and 14Ω dynamic impedance at IZ = 5.6mA ensure repeatable regulation under varying load and temperature conditions.
Designed for leaded through-hole mounting, the DO-35 glass package provides hermetic sealing and thermal stability up to +200°C junction temperature. Reverse leakage remains ≤0.25μA at VR = 17.1V, supporting low-power standby and precision reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22V nominal at IZ = 5.6mA - defines precise regulation point for feedback and reference circuits |
| Tolerance | ±5% - ensures predictable voltage accuracy without trimming in production |
| Power Dissipation | 500mW @ TL ≤ 75°C - supports continuous operation in compact linear regulator stages |
| Zener Impedance (ZZ) | 14Ω @ IZ = 5.6mA - limits output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | ≤0.25μA @ VR = 17.1V - enables ultra-low quiescent current in battery-backed references |
| Operating Temperature | -65°C to +200°C - suitable for automotive under-hood and industrial high-temp environments |
| Package | DO-35 glass axial - provides hermeticity, thermal reliability, and standard through-hole footprint |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; establishes reference return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply; clamps voltage to 22V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-35 glass construction | Enables long-term parameter stability and moisture resistance in harsh environments |
| 5% VZ tolerance at 25°C | Reduces need for post-assembly calibration in cost-sensitive consumer and industrial power supplies |
| 14Ω dynamic impedance | Maintains <100mV output deviation across 1–10mA load current range in shunt regulator use |
| 0.25μA max IR at 17.1V | Minimizes error contribution in high-impedance reference divider networks |
| -65°C to +200°C operating range | Supports deployment in engine control units, downhole tools, and military-grade power modules |
Applications
| Industrial Power Supply Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Providing stable 22V reference for op-amp comparators in 24V rail monitoring circuits. IC Role / Device Role / Timing Role: Shunt voltage reference establishing accurate trip thresholds for overvoltage protection logic. Use Value: 14Ω impedance and ±5% tolerance ensure trip point repeatability within ±110mV across temperature and unit-to-unit variation. | Use Scenario: Biasing bridge-based pressure sensors in engine manifold modules exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Precision voltage reference supplying excitation to Wheatstone bridge elements. Use Value: -65°C to +200°C operation and hermetic DO-35 packaging prevent drift or failure during thermal cycling. |
| Programmable Logic Controller Input Protection | Medical Instrumentation Signal Conditioning |
Use Scenario: Clamping 24V digital inputs against transients while maintaining logic-level integrity. IC Role / Device Role / Timing Role: Overvoltage clamp limiting input voltage to safe levels for microcontroller GPIO pins. Use Value: 500mW power rating and 22V breakdown absorb repetitive 100ns/1kV surges without degradation. | Use Scenario: Stabilizing reference voltage for 16-bit ADC front-end in portable ECG analyzers. IC Role / Device Role / Timing Role: Low-drift DC reference source for analog signal chain calibration. Use Value: 0.25μA reverse leakage minimizes loading error on high-impedance gain-setting resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | 22V nominal, 5% tolerance, 1W power rating, DO-41 package | Higher power handling but larger footprint; requires PCB layout change | Select when >500mW dissipation or higher surge immunity is required |
| BZX55C22 | 22V nominal, 5% tolerance, 500mW, DO-35 package, tighter 2% tolerance option available | Same mechanical form factor; lower typical ZZ (10Ω) but same IR spec | Choose for improved regulation stability if tighter initial tolerance or lower impedance is critical |
Compared with 1N969B_T50A, the 1N4748A offers higher power margin but demands board rework, while BZX55C22 delivers identical DO-35 fit with potentially better regulation performance-making it a drop-in upgrade where tighter specs are needed without layout change.
Availability
1N969B_T50A is available at Aetrix Electronics and suitable for industrial power supply reference, automotive sensor biasing, programmable logic controller input protection, and medical instrumentation signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 1N969B_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 1N969B_T50A belongs to the legacy 1N957B–1N979B Zener diode family, engineered for general-purpose voltage regulation and reference in cost-sensitive, high-reliability linear power and sensing applications.
FAQ
What is the nominal Zener voltage and test current for the 1N969B_T50A?
The 1N969B_T50A has a nominal Zener voltage of 22V measured at a test current (IZ) of 5.6mA. This value is specified with ±5% tolerance at 25°C and forms the basis for its use as a stable voltage reference in shunt regulator configurations. The 1N969B_T50A maintains this regulation point across its full operating temperature range.
What is the maximum power dissipation and derating behavior of the 1N969B_T50A?
The 1N969B_T50A is rated for 500mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8" lead length. Above 75°C, it derates linearly at 4.0mW/°C. This thermal profile allows reliable operation in ambient environments up to +200°C junction temperature when properly heatsinked or mounted with appropriate lead length.
Does the 1N969B_T50A have a defined cathode marking, and how is polarity identified?
Yes, the 1N969B_T50A uses a color band on the DO-35 glass body to denote the cathode terminal. This band must be oriented toward the higher-potential side in reverse-bias operation. The anode is the unmarked end, and correct polarity is essential for proper Zener breakdown and voltage regulation functionality of the 1N969B_T50A.
What is the reverse leakage current specification for the 1N969B_T50A, and at what voltage is it measured?
The 1N969B_T50A specifies a maximum reverse leakage current (IR) of 0.25μA, measured at a reverse voltage (VR) of 17.1V - which is 75% of its nominal 22V Zener voltage. This low leakage supports high-impedance reference networks and minimizes error in precision analog circuits using the 1N969B_T50A.
Is the 1N969B_T50A suitable for high-temperature applications such as automotive under-hood systems?
Yes, the 1N969B_T50A is rated for operation from -65°C to +200°C, making it suitable for automotive under-hood applications including engine control units and transmission modules. Its DO-35 glass package provides hermetic sealing and thermal stability, ensuring consistent 1N969B_T50A performance where plastic-packaged alternatives may degrade.
1N969B_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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N969B_T50A FAQ
1.How can I place an order for 1N969B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N969B_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 1N969B_T50A reliable?
The price and inventory of 1N969B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N969B_T50A is usually 5 days.
3.What payment methods are accepted for 1N969B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N969B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N969B_T50A?
1N969B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N969B_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 1N969B_T50A?
For technical support, including 1N969B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N969B_T50A requirements.
6.How does Aetrix verify that 1N969B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N969B_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 1N969B_T50A meets industry standards.
7.What is the process for return or replacement of 1N969B_T50A?
All 1N969B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N969B_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 1N969B_T50A part is unused and in its original packaging.
Return procedure for 1N969B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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