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onsemi 1N967B_T50R
- Part No.:
- 1N967B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N967B_T50R.pdf
- Description:
- DIODE ZENER 18V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,485
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Product details
Overview
1N967B_T50R from Fairchild Semiconductor is a 5% tolerance, 18 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at ≤75°C, with 7.0 Ω dynamic impedance at 21 mA test current and 0.25 μA reverse leakage at 13.7 V. It provides stable voltage reference in low-power analog regulation and overvoltage protection circuits.
For engineers reviewing the 1N967B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, dynamic impedance at specified test current, reverse leakage at rated voltage, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N967B_T50R operates as a two-terminal silicon Zener diode optimized for precision voltage clamping and reference generation in DC bias networks. Its 18 V nominal breakdown voltage is specified at 21 mA (IZ), with tight 5% tolerance and low 7.0 Ω dynamic impedance (ZZ) ensuring minimal voltage variation under load changes.
It exhibits 0.25 μA maximum reverse leakage (IR) at 13.7 V (VR = 0.76 × VZ), confirming stable off-state blocking. The device is rated for junction temperatures from –65°C to +200°C and requires 4.0 mW/°C linear derating above 75°C ambient lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.0 V nominal, ±5% tolerance - defines precise clamping threshold for regulation or protection |
| Zener Impedance (ZZ) | 7.0 Ω at IZ = 21 mA - ensures <140 mV output shift per 20 mA load change |
| Reverse Leakage (IR) | 0.25 μA max at VR = 13.7 V - guarantees negligible standby current in high-impedance bias networks |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous operation in compact through-hole designs |
| Thermal Derating | 4.0 mW/°C above 75°C - enables predictable power margining in elevated ambient environments |
| Operating Temp Range | –65°C to +200°C - validated for industrial, automotive under-hood, and aerospace-grade applications |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry. Leads are tinned copper-clad steel, 0.51 mm diameter, 3/8″ length standard for thermal rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node in reverse-biased configuration; establishes reference return path |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to higher-potential rail; conducts when voltage exceeds 18 V ±5%, shunting excess current |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables accurate voltage setting without post-assembly trimming in production analog circuits |
| Low 7.0 Ω dynamic impedance | Maintains ±0.15 V regulation window across 10–30 mA operating range |
| 0.25 μA max reverse leakage | Prevents signal distortion in high-impedance op-amp feedback networks and sensor biasing |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift (<0.01%/1000 hrs typical) |
Applications
| Reference Voltage Source | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable bias for op-amp comparators and ADC reference dividers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing 18 V reference point independent of supply variation. Use Value: Delivers ±0.9 V absolute accuracy and <140 mV load regulation error across 10–25 mA, reducing calibration overhead. | Use Scenario: Protecting microcontroller I/O pins from transient surges on 15–24 V industrial control lines. IC Role / Device Role / Timing Role: Shunt clamping element that activates at 18 V to divert fault current away from sensitive inputs. Use Value: Limits peak voltage to ≤18.9 V (VZ max) within 100 ns, preventing latch-up in 3.3 V or 5 V logic interfaces. |
| DC Power Supply Regulation | Signal Level Translation |
Use Scenario: Stabilizing unregulated 24 V wall adapter outputs for analog sensor modules requiring clean 18 V rails. IC Role / Device Role / Timing Role: Series-pass regulator component in simple shunt-regulated linear supply topology. Use Value: Maintains output within ±0.15 V over 5–20 mA load, eliminating need for three-terminal IC regulators in cost-sensitive designs. | Use Scenario: Level-shifting 3.3 V logic signals to interface with 18 V analog front-end stages in mixed-signal data acquisition systems. IC Role / Device Role / Timing Role: Bidirectional voltage limiter defining safe high-side and low-side signal excursion bounds. Use Value: Clamps negative excursions to –0.7 V (forward drop) and positive excursions to +18.9 V, preserving signal integrity without active components. |
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 at 25 mA | Higher power handling but lower voltage and looser 5% tolerance; larger footprint | Select when 14 V clamping and >500 mW pulse capability are required |
| BZX55-C18 | 18 V nominal, 5% tolerance, 500 mW, DO-35, 20 Ω ZZ at 5 mA | Higher dynamic impedance reduces regulation accuracy under varying loads | Choose for legacy BZX55 footprint compatibility where 7 Ω ZZ is not critical |
Compared with 1N4744A and BZX55-C18, the 1N967B_T50R delivers tighter regulation (7.0 Ω vs. 20 Ω) at its nominal 18 V point in the same DO-35 form factor, making it optimal for space-constrained, precision-clamp applications where low-impedance voltage stability is prioritized over raw power rating.
Availability
1N967B_T50R is available at Aetrix Electronics and suitable for industrial control systems, analog sensor signal conditioning, embedded power supply supervision, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N967B_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 devices before its acquisition by ON Semiconductor in 2016.
The 1N957B–1N979B series was designed specifically for general-purpose, high-reliability Zener voltage regulation and clamping in industrial, automotive, and instrumentation applications where DO-35 form factor and stable long-term VZ drift were critical.
FAQ
What is the nominal Zener voltage and tolerance of the 1N967B_T50R?
The 1N967B_T50R has a nominal Zener voltage of 18.0 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 17.1 V and 18.9 V at 21 mA test current and 25°C. This tolerance is measured under standardized conditions per Fairchild's datasheet Rev. F1 and applies directly to the 1N967B_T50R device marking.
What is the Zener impedance (ZZ) of the 1N967B_T50R and why does it matter?
The 1N967B_T50R exhibits a Zener impedance of 7.0 Ω at IZ = 21 mA. This low value means the device maintains tight voltage regulation-less than 140 mV deviation across a 20 mA load swing-making it suitable for precision biasing and clamping where output stability under dynamic current is essential.
Does the 1N967B_T50R have a specified reverse leakage current, and at what voltage is it measured?
Yes, the 1N967B_T50R has a maximum reverse leakage current (IR) of 0.25 μA, measured at VR = 13.7 V (76% of nominal VZ). This low leakage ensures minimal parasitic current draw in high-impedance reference networks, preserving accuracy in op-amp feedback paths and sensor bias circuits.
What is the power dissipation rating and thermal derating behavior of the 1N967B_T50R?
The 1N967B_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C-so at 105°C TL, usable power drops to 380 mW. This derating curve is defined in the Absolute Maximum Ratings table of the Fairchild 1N957B–1N979B datasheet.
Is the 1N967B_T50R packaged in DO-35, and how is polarity marked?
Yes, the 1N967B_T50R uses the DO-35 glass axial package. Polarity is indicated by a single color band near one end, denoting the cathode terminal. This marking aligns with JEDEC standards and matches the physical layout shown in the Fairchild datasheet diagram on page 2.
1N967B_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):
- 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_T50R FAQ
1.How can I place an order for 1N967B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N967B_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 1N967B_T50R reliable?
The price and inventory of 1N967B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N967B_T50R is usually 5 days.
3.What payment methods are accepted for 1N967B_T50R?
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4.How is shipping managed for 1N967B_T50R?
1N967B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N967B_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 1N967B_T50R?
For technical support, including 1N967B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N967B_T50R requirements.
6.How does Aetrix verify that 1N967B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N967B_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 1N967B_T50R meets industry standards.
7.What is the process for return or replacement of 1N967B_T50R?
All 1N967B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N967B_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 1N967B_T50R part is unused and in its original packaging.
Return procedure for 1N967B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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