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onsemi 1N963B_T50R
- Part No.:
- 1N963B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N963B_T50R.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,187
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Product details
Overview
1N963B_T50R from Fairchild Semiconductor is a 12 V, 5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.
For engineers reviewing the 1N963B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage (11.4–12.6 V), dynamic impedance (26 Ω @ 11.5 mA), leakage current (≤0.25 μA @ 9.1 V), power derating (4.0 mW/°C above 75°C), and operating temperature range (–65 to +200°C).
Technical Context
The 1N963B_T50R operates as a two-terminal voltage reference device with sharp reverse-breakdown characteristics. Its zener voltage is specified at 11.5 mA test current, with typical dynamic impedance of 26 Ω and knee impedance of 26 Ω at IZK = 5 mA, ensuring stable regulation under varying load conditions.
It features glass-passivated junction construction in a DO-35 axial package, enabling reliable operation across –65°C to +200°C ambient. The 5% tolerance and low leakage (≤0.25 μA @ VR = 9.1 V) support use in high-stability analog references and precision clamping circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4–12.6 V at IZ = 11.5 mA - defines nominal regulation point with ±5% tolerance |
| Zener Impedance (ZZ) | 26 Ω @ IZ = 11.5 mA - determines output voltage variation under load transients |
| Max Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling at lead temperature |
| Leakage Current (IR) | ≤0.25 μA @ VR = 9.1 V - ensures minimal error current in high-impedance reference nodes |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive under-hood, industrial, and aerospace environments |
| Thermal Derating | 4.0 mW/°C above 75°C - enables accurate thermal design margining for PCB layout |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no external biasing. Cathode identified by single color band near one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail in shunt regulator configuration |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to input voltage source and load; maintains stable voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener Voltage Tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| Glass-Passivated Junction | Provides enhanced moisture resistance and long-term parameter stability vs. epoxy-packaged alternatives |
| Low Knee Impedance (26 Ω) | Ensures tight voltage regulation even at low test currents (IZK = 5 mA), improving startup behavior |
| High-Temperature Operation | Rated to +200°C junction temperature - suitable for under-hood automotive and high-power industrial systems |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 12 V threshold to TL431 or similar error amplifier. Use Value: Tight 5% VZ tolerance and low ZZ ensure <±1% output regulation accuracy across line/load/temperature. | Use Scenario: Placed across sensitive IC inputs to clamp transient surges exceeding 12 V. IC Role / Device Role / Timing Role: Fast-acting crowbar element absorbing ESD or inductive kick energy before downstream damage. Use Value: Low leakage (<0.25 μA) avoids loading of high-Z sensor interfaces; glass passivation prevents humidity-induced drift. |
| Industrial Sensor Signal Conditioning | Programmable Voltage Reference |
Use Scenario: Biasing bridge amplifiers or setting ADC reference thresholds in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Stable 12 V reference source for op-amp biasing and ratiometric scaling networks. Use Value: –65°C to +200°C operating range supports field-deployed instrumentation in extreme ambient conditions. | Use Scenario: Paired with resistor dividers to generate custom reference voltages in programmable logic controllers. IC Role / Device Role / Timing Role: Primary Zener element in adjustable shunt regulator topology with external feedback resistors. Use Value: Consistent 26 Ω dynamic impedance ensures predictable divider ratio tracking across temperature and current variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 5% tolerance, 1 W rating, DO-41 package - higher power but larger footprint | Preferred where >500 mW dissipation is required; not suitable for space-constrained DO-35 layouts | Select 1N4742A only if thermal budget exceeds 500 mW or board real estate allows DO-41 mounting |
| BZX55-C12 | 12 V nominal, 5% tolerance, 500 mW, DO-35 - identical electrical specs but different manufacturer marking and traceability | Drop-in replacement in legacy designs requiring same form factor and performance; RoHS-compliant variant available | Choose BZX55-C12 when dual-sourcing or compliance with alternate supply chain requirements is mandated |
Compared with 1N4742A and BZX55-C12, the 1N963B_T50R offers identical voltage regulation performance in the compact DO-35 package, with proven reliability in high-temperature industrial deployments - making it optimal for size-constrained, thermally demanding applications where 500 mW suffices.
Availability
1N963B_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor signal conditioning requiring stable component supply and long-lifecycle availability.
Supply support for 1N963B_T50R 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 developed as a family of general-purpose, glass-passivated Zener diodes targeting cost-effective, high-reliability voltage reference and protection functions in industrial and automotive systems.
FAQ
What is the nominal zener voltage of the 1N963B_T50R?
The 1N963B_T50R has a nominal zener voltage of 12 V, with a guaranteed range of 11.4 V to 12.6 V at 11.5 mA test current and ±5% tolerance. This value is measured under thermal equilibrium at lead temperature of 30°C ±1°C with 3/8" lead length, per Fairchild's characterization methodology.
Does the 1N963B_T50R have a specified zener impedance?
Yes, the 1N963B_T50R specifies a zener impedance (ZZ) of 26 Ω at IZ = 11.5 mA and 60 Hz ac signal superimposed on dc bias. Its knee impedance (ZZK) is also 26 Ω at IZK = 5 mA, confirming consistent regulation behavior across operating current range.
What is the maximum power dissipation for the 1N963B_T50R?
The 1N963B_T50R has a maximum power dissipation of 500 mW at lead temperature (TL) ≤ 75°C. Above 75°C, it must be derated linearly at 4.0 mW/°C, reaching zero dissipation at approximately 200°C lead temperature - matching its rated storage temperature limit.
Is the 1N963B_T50R suitable for high-temperature environments?
Yes, the 1N963B_T50R is rated for operation from –65°C to +200°C, making it suitable for under-hood automotive, downhole oil/gas, and industrial control applications. Its glass-passivated junction ensures parameter stability and moisture resistance at elevated temperatures.
How is polarity marked on the 1N963B_T50R package?
The 1N963B_T50R uses a DO-35 axial glass package with a single cathode band (color band) near one end to denote the cathode terminal. The anode is the unmarked end. This marking aligns with JEDEC DO-35 mechanical standards and Fairchild's top-marking specification for the 1N9xxB series.
1N963B_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 11.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N963B_T50R FAQ
1.How can I place an order for 1N963B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N963B_T50R 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 1N963B_T50R reliable?
The price and inventory of 1N963B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N963B_T50R is usually 5 days.
3.What payment methods are accepted for 1N963B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N963B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N963B_T50R?
1N963B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N963B_T50R 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 1N963B_T50R?
For technical support, including 1N963B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N963B_T50R requirements.
6.How does Aetrix verify that 1N963B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N963B_T50R 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 1N963B_T50R meets industry standards.
7.What is the process for return or replacement of 1N963B_T50R?
All 1N963B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N963B_T50R, 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 1N963B_T50R part is unused and in its original packaging.
Return procedure for 1N963B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N963B_T50R Tags
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