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onsemi 1N967B_T50A
- Part No.:
- 1N967B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N967B_T50A.pdf
- Description:
- DIODE ZENER 18V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,791
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Product details
Overview
1N967B_T50A from Fairchild Semiconductor is a 5% tolerance, 18 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, operating across -65°C to +200°C, and used for precision voltage regulation in low-power analog reference circuits.
For engineers reviewing the 1N967B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include verified Zener voltage (17.1–18.9 V), dynamic impedance (17 Ω @ 21 mA), leakage current (≤0.25 μA @ 13.7 V), maximum Zener current (21 mA), and DO-35 thermal and mechanical compatibility.
Technical Context
The 1N967B_T50A operates as a two-terminal voltage reference device, maintaining stable reverse-biased conduction at its specified Zener voltage range. Its junction design supports operation up to +200°C and storage down to -65°C, with thermal derating applied above 75°C ambient lead temperature.
It exhibits a typical Zener impedance of 17 Ω measured at 21 mA DC bias with 0.1×IZ AC signal at 60 Hz, and guarantees IR ≤ 0.25 μA at VR = 13.7 V - confirming tight low-current regulation performance suitable for battery-powered and low-leakage sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V min / 18.9 V max at IZ = 21 mA - defines usable regulation window under nominal bias |
| Zener Impedance (ZZ) | 17 Ω @ IZ = 21 mA - determines output voltage stability under load transients |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power handling on standard 3/8″ leads |
| Leakage Current (IR) | ≤0.25 μA @ VR = 13.7 V - ensures minimal error current in high-impedance reference nodes |
| Operating Temp Range | -65°C to +200°C - enables deployment in extended industrial and under-hood automotive environments |
| Tolerance | ±5% - specifies initial calibration accuracy without post-manufacture trimming |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry beyond series current-limiting resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to system ground or lower-potential rail when used in shunt regulation |
| Cathode | Zener breakdown terminal / Regulated output node | Provides stable voltage referenced to anode; marked by visible color band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 17 Ω @ 21 mA enables <10 mV output shift under ±5 mA load variation |
| Wide temperature range | -65°C to +200°C operation supports engine control units and downhole instrumentation |
| Tight voltage tolerance | ±5% initial accuracy reduces need for external trimming in cost-sensitive references |
| Ultra-low leakage | ≤0.25 μA @ 13.7 V minimizes error in high-Z feedback networks and battery monitoring |
Applications
| Industrial Sensor Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Providing stable 18 V reference for 12-bit ADC front-end in pressure transducer signal conditioning. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise bias point for op-amp gain stages. Use Value: 17 Ω ZZ limits reference drift to <8 mV over 10 mA sensor excitation current variation. | Use Scenario: Clamping LIN bus node supply against load-dump transients in body control modules. IC Role / Device Role / Timing Role: Overvoltage protection element absorbing surge energy above 18 V threshold. Use Value: 500 mW rating with 4.0 mW/°C derating sustains 100 ms 25 V pulses at 85°C ambient. |
| Portable Instrument Power Monitor | Legacy Telecom Line Card Bias |
Use Scenario: Monitoring Li-ion battery pack voltage via resistive divider into microcontroller ADC. IC Role / Device Role / Timing Role: Low-leakage voltage reference enabling accurate state-of-charge estimation. Use Value: 0.25 μA IR prevents >0.5% divider error in 10 MΩ top-resistor configurations. | Use Scenario: Generating stable -12 V bias for analog line driver ICs in PSTN interface cards. IC Role / Device Role / Timing Role: Negative-rail Zener reference in dual-supply linear regulator feedback loop. Use Value: -65°C to +200°C range accommodates unheated outdoor cabinet operation down to -40°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 14 V nominal, 1 W rating, DO-41 package, 20 Ω ZZ @ 25 mA | Higher power, lower voltage - unsuitable for 18 V reference but better for higher-current clamping | Select when ≥1 W dissipation or DO-41 board footprint required |
| BZX55-C18 | 18 V nominal, 500 mW, DO-35, 20 Ω ZZ @ 5 mA, ±5% tolerance | Same voltage grade and package, but higher ZZ at lower test current - less stable under varying loads | Acceptable where 5 mA bias suffices and 17 Ω ZZ at 21 mA is not required |
Compared with 1N4744A and BZX55-C18, the 1N967B_T50A delivers tighter regulation at 21 mA (17 Ω) and guaranteed low leakage (≤0.25 μA), making it preferable for precision low-current references despite identical DO-35 form factor and power rating.
Availability
1N967B_T50A is available at Aetrix Electronics and suitable for industrial sensor reference, automotive ECU voltage clamp, and portable instrument power monitor applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N967B_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 1N957B–1N979B series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and transient suppression in industrial, automotive, and telecom infrastructure equipment.
FAQ
What is the nominal Zener voltage of the 1N967B_T50A?
The 1N967B_T50A has a nominal Zener voltage of 18 V, with a guaranteed range of 17.1 V minimum to 18.9 V maximum when tested at 21 mA DC current. This specification is defined per Fairchild's Rev. F1 datasheet and reflects the device's calibrated regulation point under standard thermal conditions (TL = 30°C, 3/8″ lead length).
What package type does the 1N967B_T50A use?
The 1N967B_T50A uses the DO-35 glass axial package, identified by a cathode color band and standardized 3/8″ lead length. This package supports manual or wave soldering and provides hermetic sealing suitable for high-reliability applications, including those requiring operation from -65°C to +200°C.
What is the maximum power dissipation for the 1N967B_T50A?
The 1N967B_T50A is rated for 500 mW maximum power dissipation at lead temperature (TL) ≤ 75°C. Above 75°C, it must be derated linearly at 4.0 mW/°C, reaching zero dissipation at TL = 200°C. This rating assumes standard 3/8″ lead length and free-air convection cooling per the original Fairchild specification.
What is the Zener impedance of the 1N967B_T50A and how is it measured?
The 1N967B_T50A has a typical Zener impedance (ZZ) of 17 Ω, measured at 21 mA DC bias with a 0.1×IZ (2.1 mA) 60 Hz AC signal superimposed. This value reflects small-signal dynamic resistance and directly impacts voltage regulation stability under varying load conditions in precision reference designs.
Does the 1N967B_T50A have a specified leakage current?
Yes, the 1N967B_T50A specifies a maximum leakage current (IR) of 0.25 μA at reverse voltage (VR) = 13.7 V. This ultra-low leakage supports high-impedance applications such as battery voltage monitoring and precision divider networks where even nanoamp-level errors affect measurement accuracy.
1N967B_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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 13.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N967B_T50A FAQ
1.How can I place an order for 1N967B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N967B_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 1N967B_T50A reliable?
The price and inventory of 1N967B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N967B_T50A is usually 5 days.
3.What payment methods are accepted for 1N967B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N967B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N967B_T50A?
1N967B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N967B_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 1N967B_T50A?
For technical support, including 1N967B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N967B_T50A requirements.
6.How does Aetrix verify that 1N967B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N967B_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 1N967B_T50A meets industry standards.
7.What is the process for return or replacement of 1N967B_T50A?
All 1N967B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N967B_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 1N967B_T50A part is unused and in its original packaging.
Return procedure for 1N967B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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