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

onsemi 1N969B_T50R

Name: 1N969B_T50R
Brand: onsemi
SKU: 1N969B_T50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N969B_T50R

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N969B_T50R.pdf

Description:: DIODE ZENER 22V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:4,001

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Product details

Overview

1N969B_T50R from Fairchild Semiconductor is a 22 V, 5% tolerance, 500 mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning. It exhibits 14 Ω zener impedance at 5.6 mA, 0.25 μA reverse leakage at 17.8 V, and operates across –65°C to +200°C.

For engineers reviewing the 1N969B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal zener voltage (22 V), power dissipation (500 mW @ TL ≤ 75°C), zener impedance (14 Ω), reverse leakage (0.25 μA @ 17.8 V), and DO-35 glass package compatibility with through-hole reflow and wave soldering.

Technical Context

The 1N969B_T50R functions as a two-terminal voltage reference device where breakdown occurs via controlled avalanche mechanism. Its 22 V nominal zener voltage is specified at I_Z = 5.6 mA with ±5% tolerance, and its dynamic impedance of 14 Ω is measured under AC conditions (I_Z(ac) = 0.1 × I_Z(dc), f = 60 Hz).

Thermal derating begins at 75°C ambient lead temperature, reducing power capability by 4.0 mW/°C up to maximum junction temperature of +200°C. Reverse leakage current remains ≤0.25 μA at VR = 17.8 V (90% of V_Z), confirming stable low-current regulation behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z Nominal	22 V ±5% at I_Z = 5.6 mA - defines stable regulation point for feedback and reference use
P_D	500 mW @ T_L ≤ 75°C - sets maximum continuous power handling in standard lead configuration
Z_Z	14 Ω @ I_Z = 5.6 mA - determines output voltage stability under load transients
I_R	≤0.25 μA @ V_R = 17.8 V - ensures minimal error current in high-impedance reference nodes
T_J/T_STG	–65°C to +200°C - supports operation in automotive under-hood and industrial high-temp environments
Package	DO-35 glass axial - enables reliable through-hole mounting with hermetic seal and thermal robustness

Pinout & Package

DO-35 glass package: axial-leaded, hermetically sealed, cathode indicated by color band. Lead length 3/8″ used for power rating definition.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-voltage reference node	Connected to ground or lower-potential rail in shunt regulator configuration
Cathode	Zener breakdown terminal / regulated output node	Connected to input voltage source and load; provides stable 22 V reference when reverse-biased

Key Features

Feature	Design Value
±5% V_Z tolerance	Enables direct replacement in legacy designs requiring tight voltage accuracy without trimming
Low Z_Z (14 Ω)	Maintains <±0.1 V output variation across 1–10 mA load current range
Ultra-low I_R	Minimizes bias current error in high-resistance divider networks and op-amp reference inputs
DO-35 glass construction	Provides long-term parameter stability and resistance to moisture ingress vs. plastic packages

Applications

Switch-Mode Power Supply Feedback	Industrial Sensor Signal Conditioning
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 22 V threshold to TL431-like control circuitry. Use Value: Enables stable 1% output regulation across line/load/temperature with minimal external components.	Use Scenario: Provides stable bias reference for bridge-based pressure or temperature transducers. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric ADC excitation and offset calibration. Use Value: Maintains measurement accuracy within ±0.5% FS over –40°C to +125°C ambient due to low tempco and stable V_Z.
Overvoltage Clamp Protection	Programmable Voltage Threshold Detector
Use Scenario: Placed across microcontroller I/O pins or analog front-end inputs to limit transient surges. IC Role / Device Role / Timing Role: Fast-acting clamping element diverting ESD or inductive kick energy above 22 V. Use Value: Limits peak voltage to ≤23.1 V (V_Z(max)) while sustaining 500 mW surge without degradation.	Use Scenario: Paired with comparator to trigger fault response when supply exceeds safe operating level. IC Role / Device Role / Timing Role: Fixed 22 V threshold reference for window or overvoltage detection logic. Use Value: Delivers repeatable trip point with <±0.2 V hysteresis margin due to low Z_Z and tight tolerance.

Switch-Mode Power Supply Feedback

Industrial Sensor Signal Conditioning

Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 22 V threshold to TL431-like control circuitry.

Use Value: Enables stable 1% output regulation across line/load/temperature with minimal external components.

Use Scenario: Provides stable bias reference for bridge-based pressure or temperature transducers.

IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric ADC excitation and offset calibration.

Use Value: Maintains measurement accuracy within ±0.5% FS over –40°C to +125°C ambient due to low tempco and stable V_Z.

Overvoltage Clamp Protection

Programmable Voltage Threshold Detector

Use Scenario: Placed across microcontroller I/O pins or analog front-end inputs to limit transient surges.

IC Role / Device Role / Timing Role: Fast-acting clamping element diverting ESD or inductive kick energy above 22 V.

Use Value: Limits peak voltage to ≤23.1 V (V_Z(max)) while sustaining 500 mW surge without degradation.

Use Scenario: Paired with comparator to trigger fault response when supply exceeds safe operating level.

IC Role / Device Role / Timing Role: Fixed 22 V threshold reference for window or overvoltage detection logic.

Use Value: Delivers repeatable trip point with <±0.2 V hysteresis margin due to low Z_Z and tight tolerance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4748A	22 V, 1 W, DO-41 package, 5% tolerance, Z_Z = 21 Ω @ 10 mA	Higher power rating 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
BZX55C22	22 V, 500 mW, DO-35, 5% tolerance, Z_Z = 25 Ω @ 5 mA	Slightly higher impedance and different thermal profile; not identical derating curve	Acceptable substitute where 14 Ω Z_Z is not critical and sourcing favors ON Semi portfolio

Compared with 1N969B_T50R, the 1N4748A offers higher power but requires PCB layout changes, while BZX55C22 matches package and power but trades 14 Ω for 25 Ω impedance-impacting regulation precision in low-current references.

Availability

1N969B_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and programmable threshold detectors requiring stable component supply and long-lifecycle support.

Supply support for 1N969B_T50R 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 devices before its acquisition by ON Semiconductor in 2016.

The 1N957B–1N979B series was developed for general-purpose, high-reliability Zener reference applications demanding stable voltage regulation across extended temperature ranges and harsh environments.

FAQ

What is the nominal zener voltage and tolerance of the 1N969B_T50R?

The 1N969B_T50R has a nominal zener voltage of 22 V with a ±5% tolerance, measured at 5.6 mA test current and 30°C lead temperature. This means the actual V_Z falls between 20.9 V and 23.1 V under specified conditions. The tolerance is guaranteed per Fairchild's Rev. F1 datasheet and applies to all units marked "69B" on the third line of the DO-35 package.

What is the maximum power dissipation and thermal derating behavior of the 1N969B_T50R?

The 1N969B_T50R is rated for 500 mW power dissipation at lead temperature (T_L) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C, reaching zero power at 200°C junction temperature. This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermal design for sustained reliability.

What is the zener impedance (Z_Z) of the 1N969B_T50R and how is it measured?

The 1N969B_T50R has a zener impedance of 14 Ω, measured at I_Z = 5.6 mA using AC conditions: I_Z(ac) = 0.1 × I_Z(dc) at 60 Hz. This value reflects dynamic resistance during small-signal regulation and directly impacts output voltage stability under varying load currents in reference applications.

What does the "T50R" suffix indicate in the 1N969B_T50R part number?

The "T50R" suffix denotes tape-and-reel packaging per Fairchild's ordering convention: T = tape, 50 = 50 mm tape width, R = reel. It does not affect electrical specifications. The 1N969B_T50R shares identical electrical and thermal characteristics with the bulk (loose) 1N969B variant, differing only in packaging format for automated assembly.

What is the reverse leakage current specification for the 1N969B_T50R?

The 1N969B_T50R specifies a maximum reverse leakage current (I_R) of 0.25 μA at V_R = 17.8 V (90% of nominal V_Z). This low leakage ensures minimal error contribution in high-impedance reference circuits and confirms stable off-state behavior prior to zener conduction onset.

1N969B_T50R 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):: 22 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 29 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 16.7 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N969B_T50R FAQ

1.How can I place an order for 1N969B_T50R through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N969B_T50R 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 1N969B_T50R reliable?

The price and inventory of 1N969B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N969B_T50R is usually 5 days.

3.What payment methods are accepted for 1N969B_T50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N969B_T50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N969B_T50R?

1N969B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N969B_T50R 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 1N969B_T50R?

For technical support, including 1N969B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N969B_T50R requirements.

6.How does Aetrix verify that 1N969B_T50R is sourced from the original manufacturer or authorized distributors?

All 1N969B_T50R 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 1N969B_T50R meets industry standards.

7.What is the process for return or replacement of 1N969B_T50R?

All 1N969B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N969B_T50R, 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 1N969B_T50R part is unused and in its original packaging.

Return procedure for 1N969B_T50R:

1.Submit a request within 90 days.

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

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