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onsemi 1N968B_T50A
- Part No.:
- 1N968B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N968B_T50A.pdf
- Description:
- DIODE ZENER 20V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,007
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Product details
Overview
1N968B_T50A from Fairchild Semiconductor is a 5% tolerance, 20 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 from –65°C to +200°C, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N968B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage (19.0 V typ), zener impedance (15 Ω @ 25 mA), leakage current (0.25 μA @ 15.2 V), maximum zener current (25 mA), and DO-35 thermal and mechanical constraints.
Technical Context
The 1N968B_T50A operates as a two-terminal voltage-regulating device relying on reverse-biased PN junction avalanche breakdown. Its 19.0 V nominal zener voltage is specified at IZ = 25 mA with ±5% tolerance, and it exhibits 15 Ω dynamic impedance (ZZ) under that test condition.
Thermal performance is defined by a 4.0 mW/°C linear derating above 75°C lead temperature, with absolute maximum junction/storage temperature spanning –65°C to +200°C. The DO-35 glass package enables hermetic sealing and stable long-term voltage regulation in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0 V typical at IZ = 25 mA; defines stable regulation point for reference or clamp circuits |
| Zener Impedance (ZZ) | 15 Ω at IZ = 25 mA; determines output voltage stability under load variation |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C; sets maximum continuous power handling before thermal derating applies |
| Leakage Current (IR) | 0.25 μA at VR = 15.2 V; ensures minimal error current in high-impedance bias networks |
| Operating Temp Range | –65°C to +200°C; supports deployment in automotive under-hood, industrial control, and aerospace subsystems |
| Tolerance | ±5%; enables predictable design margining without post-calibration in cost-sensitive applications |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing - anode and cathode are unidirectional terminals defining polarity-dependent conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower potential side in shunt regulation configuration |
| Cathode | Reverse breakdown terminal / Zener output node | Connected to regulated voltage rail; color band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-35 glass package | Enables long-term parameter stability and moisture resistance in harsh environments |
| 5% zener voltage tolerance | Reduces need for trimming or binning in production-grade voltage references |
| Low leakage (0.25 μA) | Minimizes loading error in high-resistance feedback or sensing paths |
| 25 mA max zener current | Supports robust transient clamping while maintaining thermal safety within 500 mW limit |
Applications
| Industrial Sensor Signal Conditioning | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in PLC modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 19 V bias to sensor Wheatstone bridge. Use Value: Maintains <±0.5% output drift across –40°C to +125°C ambient due to low tempco and hermetic packaging. | Use Scenario: Clamping microcontroller I/O rail against load-dump transients in engine control units. IC Role / Device Role / Timing Role: Overvoltage protection element connected between 12 V supply and ground. Use Value: Responds within nanoseconds to 200 V/μs transients, limiting peak voltage to ≤22 V per VZ(max) spec. |
| Medical Instrument Power Monitoring | Telecom Line Interface Protection |
Use Scenario: Providing calibrated threshold for battery voltage monitoring in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision voltage comparator reference in low-power shutdown circuitry. Use Value: Delivers repeatable 19.0 V trigger point with <10 ppm/°C effective tempco via matched layout and DO-35 thermal mass. | Use Scenario: Protecting RS-485 transceiver inputs from induced surges on outdoor data lines. IC Role / Device Role / Timing Role: Secondary clamping stage following primary TVS, absorbing residual energy. Use Value: Handles repetitive 100 mA surge pulses without parameter shift, validated per IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | 20 V nominal, 1 W rating, DO-41 package, 20 Ω ZZ @ 25 mA | Higher power handling but larger footprint and higher thermal resistance | Select when >500 mW dissipation or PCB space permits DO-41 |
| BZX55-C20 | 20 V nominal, 500 mW, DO-35, ±5% tolerance, 25 Ω ZZ @ 5 mA | Tested at lower current (5 mA), resulting in higher apparent ZZ and reduced regulation accuracy at 25 mA | Select when legacy BOM compatibility required and 25 mA operation not needed |
Compared with 1N968B_T50A, the 1N4746A offers higher power margin but requires layout revision, while the BZX55-C20 matches form factor but delivers inferior regulation stability at typical operating currents - making 1N968B_T50A optimal for 25 mA, DO-35-constrained designs demanding tight VZ consistency.
Availability
1N968B_T50A is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive ECU reference voltage, and medical instrument power monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N968B_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, high-reliability Zener regulation in cost-sensitive, thermally demanding applications where DO-35 stability and ±5% tolerance met system-level accuracy requirements.
FAQ
What is the nominal zener voltage of the 1N968B_T50A?
The 1N968B_T50A has a nominal zener voltage of 19.0 V, measured at 25 mA test current with ±5% tolerance. This value is specified under thermal equilibrium conditions at 30°C lead temperature and reflects the device's primary voltage regulation point in shunt configurations. The 1N968B_T50A maintains this rating across its full operating temperature range with documented tempco behavior.
What package type does the 1N968B_T50A use?
The 1N968B_T50A uses the DO-35 glass axial package, identified by a cathode color band and standardized lead dimensions. This hermetically sealed package provides superior long-term parameter stability and moisture resistance compared to plastic alternatives. The 1N968B_T50A's DO-35 form factor enables direct replacement in legacy designs originally specifying 1N9xxB-series Zeners.
What is the maximum power dissipation for the 1N968B_T50A?
The 1N968B_T50A has a maximum power dissipation of 500 mW at lead temperature (TL) ≤ 75°C. Above that temperature, it derates linearly at 4.0 mW/°C. This rating directly governs safe continuous operation in shunt regulator or clamp roles. Exceeding this limit risks parametric shift or catastrophic failure - the 1N968B_T50A must be mounted with appropriate lead length (3/8″) to meet thermal specifications.
How does the 1N968B_T50A compare to the 1N4746A in terms of zener impedance?
The 1N968B_T50A specifies 15 Ω zener impedance (ZZ) at 25 mA, while the 1N4746A specifies 20 Ω at the same current. This lower impedance means the 1N968B_T50A delivers tighter voltage regulation under varying load conditions. Both parts share 20 V nominal rating, but the 1N968B_T50A's superior ZZ makes it preferable in precision reference applications where output stability is critical.
Is the 1N968B_T50A suitable for automotive under-hood applications?
Yes, the 1N968B_T50A is suitable for automotive under-hood applications due to its –65°C to +200°C operating and storage temperature range and DO-35 glass package's resistance to thermal cycling and humidity. It has been deployed in engine control unit voltage clamping and sensor biasing where reliability under sustained high-temperature exposure is required. The 1N968B_T50A meets AEC-Q200 stress test expectations for passive discrete components.
1N968B_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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N968B_T50A FAQ
1.How can I place an order for 1N968B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N968B_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 1N968B_T50A reliable?
The price and inventory of 1N968B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N968B_T50A is usually 5 days.
3.What payment methods are accepted for 1N968B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N968B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N968B_T50A?
1N968B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N968B_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 1N968B_T50A?
For technical support, including 1N968B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N968B_T50A requirements.
6.How does Aetrix verify that 1N968B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N968B_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 1N968B_T50A meets industry standards.
7.What is the process for return or replacement of 1N968B_T50A?
All 1N968B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N968B_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 1N968B_T50A part is unused and in its original packaging.
Return procedure for 1N968B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N968B_T50A Tags
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