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onsemi 1N961B_T50A
- Part No.:
- 1N961B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N961B_T50A.pdf
- Description:
- DIODE ZENER 10V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,973
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Product details
Overview
1N961B_T50A from Fairchild Semiconductor is a 10 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 12.5 mA maximum zener current (IZM), 8.5 Ω typical zener impedance (ZZ) at IZ = 12.5 mA, and 0.25 μA reverse leakage (IR) at VR = 7.6 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog regulators and signal conditioning circuits.
For engineers reviewing the 1N961B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its 10 V nominal zener voltage, DO-35 axial leaded package, 5% tolerance, 8.5 Ω dynamic impedance, and -65°C to +200°C operating temperature range.
Technical Context
The 1N961B_T50A operates as a silicon planar Zener diode with sharp reverse breakdown at precisely defined voltage thresholds. Its 10 V nominal zener voltage is specified at IZ = 12.5 mA, with 8.5 Ω typical dynamic impedance measured under AC conditions (IZ(ac) = 0.1 IZ(dc), 60 Hz), ensuring stable regulation across moderate load variations.
Thermal performance is defined by a 4.0 mW/°C derating above 75°C ambient lead temperature, supporting reliable operation in compact PCB layouts where localized heating may occur. The device's 0.25 μA IR at VR = 7.6 V confirms low leakage in standby states, critical for battery-powered sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V nominal (min 9.5 V, max 10.5 V at IZ = 12.5 mA); defines precise clamping/reference level in feedback loops |
| Zener Impedance (ZZ) | 8.5 Ω typical at IZ = 12.5 mA; determines output voltage stability under load transients |
| Max Zener Current (IZM) | 12.5 mA; sets upper limit for continuous regulation without exceeding 500 mW power rating |
| Reverse Leakage (IR) | 0.25 μA at VR = 7.6 V; ensures minimal quiescent current in high-impedance bias networks |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C; defines thermal design margin for through-hole mounting with 3/8″ lead length |
| Operating Temp Range | -65°C to +200°C; supports deployment in automotive engine compartments and industrial control enclosures |
Pinout & Package
1N961B_T50A uses a DO-35 glass axial-leaded package with cathode identified by a color band. It has two terminals: anode and cathode - no internal circuitry or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connected to regulated/higher-potential node during voltage reference operation |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable threshold setting in ±1% reference designs when combined with trimming resistors |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift (<0.01%/1000 hrs) in humid environments |
| Low 0.25 μA leakage at 7.6 V | Minimizes error in high-resistance divider networks used with op-amp references |
| 12.5 mA IZM rating | Supports direct drive of small-signal transistor bases or CMOS input protection without external current limiting |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Signal Paths |
|---|---|
Use Scenario: Stable 10 V reference for rail-to-rail op-amp biasing in precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage to set common-mode input level and gain-setting resistor ratios. Use Value: 8.5 Ω ZZ ensures <10 mV output shift under 1 mA load variation, maintaining amplifier accuracy. | Use Scenario: Protection of ADC inputs against ESD-induced transients in industrial 4–20 mA loop receivers. IC Role / Device Role / Timing Role: Clamps transient voltages above 10.5 V to prevent damage to downstream analog front-end components. Use Value: 0.25 μA IR at 7.6 V avoids loading of high-impedance sensor outputs during normal operation. |
| Low-Power Regulator for Microcontroller Peripherals | Threshold Detector in Battery Monitoring Circuits |
Use Scenario: Local 10 V supply for EEPROM programming voltage generation in embedded systems with limited board space. IC Role / Device Role / Timing Role: Functions as shunt regulator with series resistor to deliver stable programming voltage to non-volatile memory cells. Use Value: 500 mW PD rating allows sustained 10 V output at up to 12.5 mA, sufficient for byte-programming cycles. | Use Scenario: Undervoltage lockout (UVLO) trigger in lithium-ion battery fuel gauges operating down to 2.5 V system supply. IC Role / Device Role / Timing Role: Serves as precision threshold element in comparator-based detection circuit with hysteresis. Use Value: Tight 5% VZ tolerance ensures consistent trip point across temperature, reducing calibration overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | 10 V nominal, 5% tolerance, but rated for 1 W PD in DO-41 package; higher thermal mass and larger footprint | Suitable for higher-current regulation (>20 mA), not drop-in due to DO-41 vs. DO-35 mechanical mismatch | Select 1N4740A only if board layout accommodates larger package and higher power handling is required |
| BZX55-C10 | 10 V nominal, 5% tolerance, DO-35 package, but 500 mW rating with 15 Ω typical ZZ at 5 mA - higher impedance than 1N961B_T50A | Better suited for low-current biasing where regulation stiffness is less critical | Choose BZX55-C10 when cost sensitivity outweighs need for lowest possible dynamic impedance |
Compared with 1N4740A and BZX55-C10, the 1N961B_T50A delivers superior regulation stability (8.5 Ω ZZ) in the standard DO-35 form factor, making it optimal for space-constrained analog signal chains requiring tight voltage control at moderate currents.
Availability
1N961B_T50A is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and low-power shunt regulation applications requiring stable component supply across industrial control, test equipment, and sensor interface designs.
Supply support for 1N961B_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 for general-purpose precision voltage regulation and transient suppression in cost-sensitive, high-reliability analog circuits.
FAQ
What is the nominal zener voltage of the 1N961B_T50A?
The 1N961B_T50A has a nominal zener voltage of 10 V, with a guaranteed range of 9.5 V to 10.5 V at test current IZ = 12.5 mA. This value is measured under thermal equilibrium at lead temperature TL = 30°C ± 1°C with 3/8″ lead length, per Fairchild's characterization methodology. The 1N961B_T50A maintains this specification across its full operating temperature range.
What package type does the 1N961B_T50A use?
The 1N961B_T50A uses a DO-35 glass axial-leaded package with cathode indicated by a color band. This hermetically sealed package ensures long-term parameter stability and low moisture ingress, critical for applications requiring consistent zener voltage over time. The 1N961B_T50A's DO-35 footprint is standardized for manual and automated through-hole assembly.
What is the maximum power dissipation rating for the 1N961B_T50A?
The 1N961B_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. This rating defines the safe thermal operating envelope for the 1N961B_T50A in PCB layouts where heat sinking is limited, such as dense analog sections or small-signal modules.
How does the zener impedance of the 1N961B_T50A affect circuit performance?
The 1N961B_T50A exhibits 8.5 Ω typical zener impedance (ZZ) at IZ = 12.5 mA, measured with 60 Hz AC signal at 0.1× DC current. This low dynamic impedance ensures minimal output voltage variation under load changes - for example, a 1 mA load shift causes only ~8.5 mV deviation. In precision 1N961B_T50A-based references, this directly improves system-level accuracy.
Is the 1N961B_T50A suitable for automotive under-hood applications?
Yes, the 1N961B_T50A supports operation from -65°C to +200°C, meeting extended temperature requirements for non-critical under-hood functions like sensor biasing or diagnostic voltage monitoring. Its DO-35 glass construction resists thermal cycling stress, and its 5% VZ tolerance remains valid across this full range. The 1N961B_T50A is not qualified to AEC-Q101 but has been deployed in legacy automotive subsystems where qualification is not mandated.
1N961B_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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N961B_T50A FAQ
1.How can I place an order for 1N961B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N961B_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 1N961B_T50A reliable?
The price and inventory of 1N961B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N961B_T50A is usually 5 days.
3.What payment methods are accepted for 1N961B_T50A?
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4.How is shipping managed for 1N961B_T50A?
1N961B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N961B_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 1N961B_T50A?
For technical support, including 1N961B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N961B_T50A requirements.
6.How does Aetrix verify that 1N961B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N961B_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 1N961B_T50A meets industry standards.
7.What is the process for return or replacement of 1N961B_T50A?
All 1N961B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N961B_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 1N961B_T50A part is unused and in its original packaging.
Return procedure for 1N961B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N961B_T50A Tags
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