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onsemi 1N968B
- Part No.:
- 1N968B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N968B.pdf
- Description:
- DIODE ZENER 20V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:27,260
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Product details
Overview
1N968B from onsemi is a 500 mW, ±5% tolerance, 20 V nominal Zener voltage regulator diode in a DO-35 (DO-204AH) hermetically sealed glass package, rated for –65°C to +200°C operation, with 6.2 Ω maximum Zener impedance at 25 mA test current, used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N968B datasheet, pinout, applications, or equivalent options, this device serves as a stable, high-temperature-rated Zener reference in industrial power supplies, analog sensor conditioning circuits, and legacy automotive voltage clamp designs where axial-leaded reliability and ESD robustness (>16 kV HBM) are required.
Technical Context
The 1N968B employs a silicon-oxide passivated junction for stable reverse breakdown behavior and low leakage. Its double-slug, metallurgically bonded construction ensures mechanical integrity and thermal stability under thermal cycling.
It operates with a nominal Zener voltage of 20 V at 25 mA (IZT), exhibits 0.25 µA max reverse leakage at 15.2 V (VR = 80% of VZ), and maintains ≤6.2 Ω dynamic impedance (ZZT) under regulated conditions - enabling tight voltage regulation in low-power shunt configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19–21 V at IZT = 25 mA; provides precise 20 V reference with ±5% tolerance for feedback and clamping |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C; derates linearly to zero at 200°C lead temperature |
| Zener Impedance (ZZT) | ≤6.2 Ω at IZT = 25 mA; ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.25 µA at VR = 15.2 V (80% of VZ); guarantees low quiescent current in standby modes |
| ESD Rating | Class 3 (>16 kV) per HBM; supports handling in uncontrolled assembly environments without added protection |
| Operating Temp Range | –65°C to +200°C; suitable for under-hood automotive, downhole, and high-reliability industrial use |
| Package | DO-35 (DO-204AH); axial-leaded, hermetically sealed glass with cathode band marking |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package. Cathode identified by color band; anode is unmarked lead. Leads are corrosion-resistant and readily solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode bias reference | Connected to lower-potential node in shunt regulator; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; delivers stable 20 V reference when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| Silicon-oxide passivated junction | Delivers stable Zener voltage with low noise and predictable temperature coefficient (≈+5.5 mV/°C near 20 V) |
| Double-slug construction | Improves thermal coupling between junction and leads, supporting higher pulse power capability |
| Metallurgical bonding | Ensures mechanical robustness during thermal cycling and vibration, critical for automotive/military applications |
Applications
| Industrial Power Supply Feedback | Automotive Overvoltage Clamp |
|---|---|
Use Scenario: Shunt regulator in isolated flyback auxiliary winding feedback circuit. IC Role / Device Role / Timing Role: Zener voltage reference providing error signal to optocoupler input. Use Value: Tight 20 V reference enables ±1% output regulation; DO-35 package withstands reflow and under-hood thermal stress. | Use Scenario: Reverse-biased clamp across 12 V battery rail to suppress load-dump transients. IC Role / Device Role / Timing Role: Voltage-limiting element protecting downstream analog sensors and microcontrollers. Use Value: 20 V clamping threshold prevents damage during ISO 7637-2 Pulse 5a events; >16 kV HBM rating guards against assembly ESD. |
| Legacy Analog Sensor Conditioning | High-Temperature Test Equipment Reference |
Use Scenario: Biasing and reference generation for RTD or thermocouple signal chains in process control systems. IC Role / Device Role / Timing Role: Stable DC reference source for instrumentation amplifier offset trimming and ADC reference scaling. Use Value: Low 0.25 µA leakage at 15.2 V minimizes error in high-impedance sensor nodes; –65°C to +200°C range covers furnace and reactor monitoring. | Use Scenario: Calibration reference in benchtop multimeters and data acquisition modules operating in elevated ambient temperatures. IC Role / Device Role / Timing Role: Primary voltage standard for internal self-test and auto-zero functions. Use Value: Hermetic DO-35 package prevents parameter shift during extended high-temp soak tests; ±5% tolerance meets Class II calibration accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, ±5% tolerance | Higher power, lower voltage; unsuitable for 20 V reference needs | Select only if system requires 12 V clamping and higher PD; not a drop-in replacement for 1N968B |
| BZX55C20 | 20 V nominal, ±5%, 500 mW, DO-35 package, but plastic encapsulated (not hermetic) | Lacks hermetic seal and extended temperature range; limited to –65°C to +150°C | Acceptable for commercial-grade designs where cost is prioritized over long-term stability in harsh environments |
Compared with 1N968B, the 1N4742A offers higher power but incorrect voltage; the BZX55C20 matches voltage and power but sacrifices hermeticity and high-temperature capability - making 1N968B uniquely suited for mission-critical, high-reliability applications demanding long-term parametric stability.
Availability
1N968B is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive overvoltage clamp, and high-temperature test equipment reference requiring stable component supply across extended lifecycle programs.
Supply support for 1N968B 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1N968B belongs to the legacy 1N957B Series of hermetically sealed Zener regulators, designed specifically for high-reliability voltage reference and clamping in environments demanding extended temperature operation and long-term parameter stability.
FAQ
What is the nominal Zener voltage and tolerance of the 1N968B?
The 1N968B has a nominal Zener voltage of 20 V with a tolerance of ±5%, meaning its actual breakdown voltage falls within 19 V to 21 V when tested at 25 mA (IZT) and 25°C ambient. This tolerance is indicated by the "B" suffix per JEDEC standard and is confirmed in the Electrical Characteristics table on page 174 of the onsemi datasheet.
What package type does the 1N968B use, and how is polarity marked?
The 1N968B uses the DO-35 (also designated DO-204AH) axial-leaded, hermetically sealed glass package. Polarity is marked by a single color band on the cathode end; the unmarked lead is the anode. This marking aligns with industry-standard diode identification and is explicitly shown in the Marking Diagram on page 173.
What is the maximum Zener impedance of the 1N968B, and at what test condition is it specified?
The 1N968B has a maximum Zener impedance (ZZT) of 6.2 Ω, measured at the Zener test current IZT = 25 mA and TA = 25°C. This value reflects dynamic resistance under regulation and directly impacts voltage regulation accuracy during load variations - a key parameter for shunt reference design.
Does the 1N968B meet any ESD immunity standards, and what is its rating?
Yes, the 1N968B is rated for Class 3 ESD immunity per the Human Body Model (HBM), with a minimum withstand voltage of >16 kV. This specification is listed under "Specification Features" on page 173 and confirms robustness during manual handling and board assembly without requiring additional ESD protection circuitry.
What is the operating temperature range of the 1N968B, and how does it compare to plastic-packaged Zeners?
The 1N968B operates from –65°C to +200°C, enabled by its hermetically sealed glass package and metallurgical construction. This exceeds the typical –65°C to +150°C range of plastic-packaged alternatives like the BZX55C20, making it suitable for downhole, aerospace, and under-hood automotive applications where long-term stability at extreme temperatures is mandatory.
1N968B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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-204AH (DO-35)
1N968B FAQ
1.How can I place an order for 1N968B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N968B 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 reliable?
The price and inventory of 1N968B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N968B is usually 5 days.
3.What payment methods are accepted for 1N968B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N968B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N968B?
1N968B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N968B 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?
For technical support, including 1N968B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N968B requirements.
6.How does Aetrix verify that 1N968B is sourced from the original manufacturer or authorized distributors?
All 1N968B 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 meets industry standards.
7.What is the process for return or replacement of 1N968B?
All 1N968B units undergo pre-shipment inspection (PSI). If there is an issue with 1N968B, 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 part is unused and in its original packaging.
Return procedure for 1N968B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N968B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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