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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi 1N968BTR

Name: 1N968BTR
Brand: onsemi
SKU: 1N968BTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N968BTR

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N968BTR.pdf

Description:: DIODE ZENER 20V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:3,290

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Product details

Overview

1N968BTR from Fairchild Semiconductor is a 5% tolerance, 20 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C with 15 Ω typical zener impedance at 25 mA, used for voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N968BTR datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal derating slope (4.0 mW/°C), cathode identification via color band, and compliance with JEDEC DO-35 mechanical standards.

Technical Context

The 1N968BTR operates as a silicon planar Zener diode with controlled avalanche breakdown at 20 V nominal, optimized for stable DC voltage reference in bias networks, overvoltage clamping, and feedback sensing where ±5% initial accuracy and low dynamic impedance are required.

Its DO-35 axial glass package enables through-hole mounting with defined lead length (3/8″) for thermal management, and its 15 Ω typical zener impedance at I_Z = 25 mA ensures minimal output voltage variation under load changes in precision regulator designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	19 V min / 20 V typ / 21 V max at I_Z = 25 mA - defines regulated output range under nominal test conditions
Zener Impedance (Z_Z)	15 Ω typ at I_Z = 25 mA - determines AC voltage deviation during current transients
Power Dissipation (P_D)	500 mW @ T_L ≤ 75°C - sets maximum steady-state power handling before thermal derating applies
Derating Slope	4.0 mW/°C above 75°C - quantifies linear reduction in allowable power per degree rise in lead temperature
Reverse Leakage (I_R)	0.25 μA @ V_R = 15.2 V - specifies off-state current that affects high-impedance bias networks
Operating Temp Range	–65°C to +200°C - supports operation in extended industrial and automotive under-hood environments

Pinout & Package

DO-35 glass axial package with cathode identified by a single color band; leads are unmarked anode/cathode terminals requiring orientation verification via band placement during PCB layout.

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 higher potential node to enable voltage regulation

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables predictable regulation without post-production trimming in cost-sensitive analog references
15 Ω typical dynamic impedance	Minimizes output voltage ripple under varying load currents in feedback loops
DO-35 glass package	Provides hermetic sealing and stable long-term parametric drift for reliability-critical applications
–65°C to +200°C operating range	Supports deployment in high-temperature industrial controls and automotive engine compartments

Applications

Power Supply Reference	Overvoltage Clamp
Use Scenario: Low-current voltage reference in linear regulator feedback divider networks. IC Role / Device Role / Timing Role: Provides stable 20 V reference point for error amplifier comparison. Use Value: ±5% V_Z tolerance and 15 Ω Z_Z ensure <1% output variation across line/load changes.	Use Scenario: Protection circuit limiting input voltage to sensitive analog front-ends. IC Role / Device Role / Timing Role: Shunts excess energy above 21 V to ground during transient surges. Use Value: 500 mW P_D rating allows sustained clamping of 25 mA surges without thermal runaway.
Bias Network Stabilizer	Temperature-Compensated Sensor Excitation
Use Scenario: Establishing fixed bias points for op-amp input stages in instrumentation amplifiers. IC Role / Device Role / Timing Role: Supplies stable DC offset independent of supply rail fluctuations. Use Value: Low 0.25 μA leakage at 15.2 V prevents loading of high-impedance bias resistors.	Use Scenario: Exciting RTD or thermistor bridges requiring precise excitation voltage. IC Role / Device Role / Timing Role: Delivers regulated 20 V excitation with minimal drift over –40°C to +125°C. Use Value: –65°C to +200°C operating range ensures stability across full sensor environmental envelope.

Power Supply Reference

Overvoltage Clamp

Use Scenario: Low-current voltage reference in linear regulator feedback divider networks.

IC Role / Device Role / Timing Role: Provides stable 20 V reference point for error amplifier comparison.

Use Value: ±5% V_Z tolerance and 15 Ω Z_Z ensure <1% output variation across line/load changes.

Use Scenario: Protection circuit limiting input voltage to sensitive analog front-ends.

IC Role / Device Role / Timing Role: Shunts excess energy above 21 V to ground during transient surges.

Use Value: 500 mW P_D rating allows sustained clamping of 25 mA surges without thermal runaway.

Bias Network Stabilizer

Temperature-Compensated Sensor Excitation

Use Scenario: Establishing fixed bias points for op-amp input stages in instrumentation amplifiers.

IC Role / Device Role / Timing Role: Supplies stable DC offset independent of supply rail fluctuations.

Use Value: Low 0.25 μA leakage at 15.2 V prevents loading of high-impedance bias resistors.

Use Scenario: Exciting RTD or thermistor bridges requiring precise excitation voltage.

IC Role / Device Role / Timing Role: Delivers regulated 20 V excitation with minimal drift over –40°C to +125°C.

Use Value: –65°C to +200°C operating range ensures stability across full sensor environmental envelope.

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, ±5%, 1 W rating, DO-41 package, 22 Ω Z_Z at 25 mA	Higher power handling but larger footprint; less suitable for space-constrained DO-35 layouts	Select when >500 mW continuous dissipation is required and board area permits DO-41
BZX55-C20	20 V nominal, ±5%, 500 mW, DO-35, 25 Ω Z_Z at 5 mA	Higher dynamic impedance at lower test current; tighter V_Z distribution but reduced regulation fidelity at 25 mA	Select when legacy BZX55 sourcing is preferred and 25 mA operation is not dominant

Compared with 1N4746A and BZX55-C20, the 1N968BTR offers optimal balance of DO-35 form factor, 15 Ω low-impedance regulation at 25 mA, and proven thermal stability up to +200°C-making it preferred for compact, high-reliability analog references where lead-temperature-controlled derating is critical.

Availability

1N968BTR is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and analog bias network stabilization requiring stable component supply and consistent DO-35 mechanical compatibility.

Supply support for 1N968BTR 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 as a standardized family of general-purpose Zener diodes targeting cost-effective, reliable voltage regulation in industrial and consumer electronics.

FAQ

What is the nominal Zener voltage of the 1N968BTR?

The 1N968BTR has a nominal Zener voltage of 20 V, with a guaranteed range of 19 V (minimum) to 21 V (maximum) at a test current of 25 mA. This specification is measured under thermal equilibrium conditions with lead temperature maintained at 30°C ±1°C and 3/8″ lead length, per Fairchild's Rev. F1 datasheet.

Does the 1N968BTR have a cathode marking, and how is it identified?

Yes, the 1N968BTR uses a single color band on the DO-35 glass body to denote the cathode terminal. This marking aligns with JEDEC standard DO-35 packaging conventions and must be oriented toward the higher-potential node in reverse-biased Zener applications. The anode remains unmarked.

What is the maximum power dissipation for the 1N968BTR, and how does it change with temperature?

The 1N968BTR is rated for 500 mW power dissipation at lead temperature (T_L) ≤ 75°C. Above this temperature, power must be linearly derated at 4.0 mW/°C, meaning usable power drops to 400 mW at T_L = 100°C. This derating ensures safe junction temperature operation within the –65°C to +200°C range.

What is the Zener impedance of the 1N968BTR, and why does it matter?

The 1N968BTR exhibits 15 Ω typical Zener impedance (Z_Z) at I_Z = 25 mA and 60 Hz AC signal superimposed on DC bias. This low dynamic impedance directly determines regulation accuracy under varying load conditions-lower Z_Z means smaller output voltage deviations during current transients in feedback or reference circuits.

Is the 1N968BTR suitable for high-temperature environments like automotive under-hood applications?

Yes, the 1N968BTR is rated for operation from –65°C to +200°C, making it suitable for under-hood automotive applications where ambient temperatures exceed 125°C. Its DO-35 glass package provides hermetic sealing and long-term parametric stability, and its thermal derating curve (4.0 mW/°C above 75°C) supports predictable performance in thermally demanding deployments.

1N968BTR 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):: 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

1N968BTR FAQ

1.How can I place an order for 1N968BTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N968BTR 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 1N968BTR reliable?

The price and inventory of 1N968BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N968BTR is usually 5 days.

3.What payment methods are accepted for 1N968BTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N968BTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N968BTR?

1N968BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N968BTR 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 1N968BTR?

For technical support, including 1N968BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N968BTR requirements.

6.How does Aetrix verify that 1N968BTR is sourced from the original manufacturer or authorized distributors?

All 1N968BTR 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 1N968BTR meets industry standards.

7.What is the process for return or replacement of 1N968BTR?

All 1N968BTR units undergo pre-shipment inspection (PSI). If there is an issue with 1N968BTR, 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 1N968BTR part is unused and in its original packaging.

Return procedure for 1N968BTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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