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onsemi 1N965B_T50A
- Part No.:
- 1N965B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N965B_T50A.pdf
- Description:
- DIODE ZENER 15V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,822
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Product details
Overview
1N965B_T50A from Fairchild Semiconductor is a 15 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 8.5 mA test current, 21 Ω dynamic impedance, and 5 μA maximum reverse leakage at 12.2 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N965B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, dynamic impedance at specified IZ, reverse leakage at VR, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals. Its 15 V nominal zener voltage is specified at 8.5 mA test current (IZ), with 21 Ω dynamic impedance (ZZ) measured under 0.1×IZ ac signal at 60 Hz.
The 1N965B_T50A exhibits 5 μA maximum reverse leakage (IR) at 12.2 V (0.82×VZ), and supports operation from –65°C to +200°C. Power dissipation derates linearly at 4.0 mW/°C above 75°C lead temperature with 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ Nominal | 15 V ±5% - precise regulation point at 8.5 mA, enabling stable biasing in analog circuits |
| ZZ Dynamic Impedance | 21 Ω @ IZ = 8.5 mA - low AC resistance ensures minimal output voltage variation under load transients |
| IR Reverse Leakage | 5 μA max @ VR = 12.2 V - guarantees low standby current in voltage-clamp and reference applications |
| PD Power Dissipation | 500 mW @ TL ≤ 75°C - defines maximum continuous DC power handling in standard lead-mount configuration |
| Derating Rate | 4.0 mW/°C above 75°C - determines usable power envelope in elevated ambient or high-lead-temp environments |
| TJ/TSTG Range | –65°C to +200°C - supports deployment in automotive under-hood, industrial, and aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal polarity-sensitive pins beyond anode/cathode orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used as shunt regulator; establishes reference potential |
| Cathode | Reverse breakdown terminal / Regulated output node | Connected to input supply via series resistor; maintains stable 15 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift under thermal cycling |
| 21 Ω dynamic impedance | Minimizes output voltage deviation during 1–10 mA load variations in reference supplies |
| 5 μA IR @ 12.2 V | Reduces quiescent current impact in battery-powered voltage monitor circuits |
Applications
| Low-Voltage Analog Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Providing stable 15 V reference for op-amp biasing and ADC reference buffers in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed potential against which analog signals are scaled and compared. Use Value: ±5% VZ tolerance and 21 Ω ZZ ensure <±15 mV regulation error across 5–10 mA load range. | Use Scenario: Clamping transient surges on 12 V rail in automotive body control modules to protect downstream logic ICs. IC Role / Device Role / Timing Role: Passive overvoltage limiter diverting excess energy to ground when rail exceeds 15 V threshold. Use Value: 500 mW PD rating and –65°C to +200°C operating range support robust surge handling in under-hood environments. |
| Power Supply Feedback Sensing | ESD-Suppressed Signal Line Protection |
Use Scenario: Sampling regulated output voltage in isolated flyback converter feedback loop using resistive divider into optocoupler input. IC Role / Device Role / Timing Role: Precision voltage sensing node stabilizing closed-loop regulation accuracy. Use Value: Low 5 μA IR minimizes divider current error, improving feedback accuracy to ±0.5%. | Use Scenario: Protecting RS-232 data lines from ESD events by placing 1N965B_T50A between line and ground with series current-limiting resistor. IC Role / Device Role / Timing Role: Bidirectional clamping element limiting line-to-ground voltage excursion to ±15 V. Use Value: DO-35 glass construction withstands repeated 8 kV HBM ESD strikes without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 15 V ±5%, 1 W PD, DO-41 package, 14 Ω ZZ @ 17 mA | Higher power rating enables higher current regulation but requires larger board area | Select when >500 mW continuous dissipation or higher IZ stability is required |
| BZX55-C15 | 15 V ±5%, 500 mW PD, DO-35 package, 30 Ω ZZ @ 5 mA | Slightly higher dynamic impedance reduces regulation tightness at low currents | Select when legacy BZX55 footprint compatibility is mandatory and 30 Ω ZZ is acceptable |
Compared with 1N4744A and BZX55-C15, the 1N965B_T50A offers identical DO-35 form factor and tighter 21 Ω impedance at its specified 8.5 mA test current, making it optimal for space-constrained, medium-precision analog references where thermal management limits power to 500 mW.
Availability
1N965B_T50A is available at Aetrix Electronics and suitable for low-power analog reference, overvoltage clamp protection, and power supply feedback sensing requiring stable component supply and consistent DO-35 mechanical fit.
Supply support for 1N965B_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 family was designed for general-purpose precision voltage regulation in cost-sensitive, thermally stable applications using industry-standard DO-35 packaging.
FAQ
What is the nominal zener voltage and tolerance of the 1N965B_T50A?
The 1N965B_T50A has a nominal zener voltage of 15 V with a tolerance of ±5%, measured at 8.5 mA test current and 30°C junction temperature. This specification ensures predictable regulation performance in voltage reference and clamp applications without requiring calibration or binning.
What is the maximum power dissipation and thermal derating behavior of the 1N965B_T50A?
The 1N965B_T50A 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, meaning usable power drops to 400 mW at TL = 100°C. This behavior must be accounted for in thermally constrained layouts.
What is the dynamic impedance (ZZ) of the 1N965B_T50A and how is it measured?
The 1N965B_T50A has a dynamic impedance of 21 Ω, measured at 8.5 mA DC bias with a 0.1×IZ (0.85 mA) 60 Hz AC signal superimposed. This value reflects small-signal AC resistance in breakdown and directly impacts regulation stability under varying load conditions.
What is the reverse leakage current specification for the 1N965B_T50A?
The 1N965B_T50A specifies a maximum reverse leakage current (IR) of 5 μA at VR = 12.2 V (0.82×VZ). This low leakage supports accurate voltage division and minimal standby power loss in battery-operated or high-impedance sensing circuits.
Which package type does the 1N965B_T50A use and how is polarity marked?
The 1N965B_T50A uses the DO-35 glass axial package. Polarity is marked by a visible cathode band near one end of the glass body; the banded end is the cathode, and the unmarked end is the anode - consistent with standard diode marking conventions.
1N965B_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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N965B_T50A FAQ
1.How can I place an order for 1N965B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N965B_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 1N965B_T50A reliable?
The price and inventory of 1N965B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N965B_T50A is usually 5 days.
3.What payment methods are accepted for 1N965B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N965B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N965B_T50A?
1N965B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N965B_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 1N965B_T50A?
For technical support, including 1N965B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N965B_T50A requirements.
6.How does Aetrix verify that 1N965B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N965B_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 1N965B_T50A meets industry standards.
7.What is the process for return or replacement of 1N965B_T50A?
All 1N965B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N965B_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 1N965B_T50A part is unused and in its original packaging.
Return procedure for 1N965B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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