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

onsemi 1N5986B_T50R

Name: 1N5986B_T50R
Brand: onsemi
SKU: 1N5986B_T50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5986B_T50R

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5986B_T50R.pdf

Description:: DIODE ZENER 2.7V 500MW DO35

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Product details

Overview

1N5986B_T50R from Fairchild Semiconductor is a 2.565 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, 100 Ω zener impedance at 5 mA test current, and 75 μA leakage current at 1 V reverse voltage - used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the 1N5986B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include verified Zener voltage tolerance (±5%), thermal derating behavior, DO-35 mechanical compatibility, and leakage performance under low-voltage bias conditions.

Technical Context

This device operates as a two-terminal voltage-reference element with fixed breakdown voltage defined by epitaxial doping and junction geometry. Its Zener voltage is specified at thermal equilibrium with 3/8″ lead length and TL = 30°C ±1°C, ensuring stable regulation under controlled PCB trace thermal coupling.

The 1N5986B_T50R exhibits 100 Ω dynamic impedance at IZ = 5 mA and 1900 Ω knee impedance at IZK = 250 μA, indicating moderate regulation stiffness above threshold and predictable turn-on behavior near knee current - critical for low-current biasing and sensing applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	2.565 V min / 2.58 V typ / 2.595 V max at I_Z = 5 mA - defines tight 2.565–2.595 V regulation band for low-voltage reference stability
Power Dissipation (P_D)	500 mW @ T_L ≤ 75°C - sets maximum continuous power handling on standard PCB leads before thermal derating applies
Zener Impedance (Z_Z)	100 Ω @ I_Z = 5 mA - determines output voltage variation under load current changes in regulated supply paths
Knee Impedance (Z_ZK)	1900 Ω @ I_ZK = 250 μA - indicates sharpness of breakdown onset, relevant for low-current sensing and threshold detection
Leakage Current (I_R)	75 μA max @ V_R = 1 V - ensures minimal parasitic current draw in standby or high-impedance bias networks
Operating Temperature	–65°C to +200°C - supports operation in extended industrial and automotive under-hood environments

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connects to lower-potential node in reverse-biased Zener configuration; carries forward current up to 200 mA (V_F ≤ 1.2 V)
Cathode	Zener breakdown terminal	Marked with color band; connects to higher-potential node during regulation; defines polarity-sensitive mounting orientation

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables use without post-manufacturing trimming in cost-sensitive voltage reference designs
DO-35 glass package	Provides hermetic sealing and stable long-term parameter drift for reliability-critical analog functions
Low leakage at 1 V reverse bias	Reduces error in high-impedance feedback networks and battery-monitoring circuits
Specified knee impedance	Supports predictable low-current regulation down to 250 μA for ultra-low-power sensor biasing

Applications

Portable Battery Monitor	Industrial Sensor Biasing
Use Scenario: Monitoring single-cell Li-ion or NiMH battery voltage in handheld medical devices with microamp-level quiescent current budget. IC Role / Device Role / Timing Role: Zener reference for ADC input scaling and low-threshold undervoltage detection circuit. Use Value: 75 μA leakage at 1 V ensures <1% error contribution in 100 kΩ divider networks, preserving measurement accuracy.	Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in factory-floor process controllers. IC Role / Device Role / Timing Role: Precision shunt reference establishing known current through RTD bridge leg. Use Value: ±5% V_Z tolerance and 100 Ω Z_Z enable <0.5% full-scale error in 2-wire RTD readout without calibration.
Low-Power Microcontroller Reset	Overvoltage Clamp for RS-232 Interface
Use Scenario: Generating clean reset signal for 3.3 V microcontrollers during brown-out conditions in remote IoT nodes. IC Role / Device Role / Timing Role: Zener-based voltage monitor feeding comparator input to assert reset when supply drops below 2.5 V. Use Value: Defined knee impedance (1900 Ω) ensures monotonic turn-on behavior across –40°C to +85°C, eliminating reset chatter.	Use Scenario: Protecting UART transceivers from ESD-induced transients on RS-232 data lines in industrial terminals. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting line voltage to 2.595 V during fast-rising surges. Use Value: DO-35 package capacitance <2 pF minimizes signal distortion on 115.2 kbps RS-232 links while clamping within spec.

Portable Battery Monitor

Industrial Sensor Biasing

Use Scenario: Monitoring single-cell Li-ion or NiMH battery voltage in handheld medical devices with microamp-level quiescent current budget.

IC Role / Device Role / Timing Role: Zener reference for ADC input scaling and low-threshold undervoltage detection circuit.

Use Value: 75 μA leakage at 1 V ensures <1% error contribution in 100 kΩ divider networks, preserving measurement accuracy.

Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in factory-floor process controllers.

IC Role / Device Role / Timing Role: Precision shunt reference establishing known current through RTD bridge leg.

Use Value: ±5% V_Z tolerance and 100 Ω Z_Z enable <0.5% full-scale error in 2-wire RTD readout without calibration.

Low-Power Microcontroller Reset

Overvoltage Clamp for RS-232 Interface

Use Scenario: Generating clean reset signal for 3.3 V microcontrollers during brown-out conditions in remote IoT nodes.

IC Role / Device Role / Timing Role: Zener-based voltage monitor feeding comparator input to assert reset when supply drops below 2.5 V.

Use Value: Defined knee impedance (1900 Ω) ensures monotonic turn-on behavior across –40°C to +85°C, eliminating reset chatter.

Use Scenario: Protecting UART transceivers from ESD-induced transients on RS-232 data lines in industrial terminals.

IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting line voltage to 2.595 V during fast-rising surges.

Use Value: DO-35 package capacitance <2 pF minimizes signal distortion on 115.2 kbps RS-232 links while clamping within spec.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4730A	V_Z = 3.9 V ±5%, P_D = 1 W, DO-41 package	Higher voltage and power rating; larger footprint and thermal mass	Select when >3 V reference or >500 mW surge handling required; not drop-in due to voltage and package mismatch
BZX55C2V7	V_Z = 2.7 V ±5%, P_D = 500 mW, DO-35 package, 100 Ω Z_Z	0.135 V higher nominal Zener voltage; same package and power rating	Acceptable where 2.7 V reference suffices; verify system margin against 2.565–2.595 V range of 1N5986B_T50R

Compared with 1N4730A and BZX55C2V7, the 1N5986B_T50R provides the only DO-35 option in the 2.565 V range with documented knee impedance and low-leakage performance at 1 V - making it uniquely suitable for sub-2.6 V precision biasing where thermal and space constraints prohibit DO-41.

Availability

1N5986B_T50R is available at Aetrix Electronics and suitable for portable battery monitors, industrial sensor biasing, low-power microcontroller reset circuits, and RS-232 overvoltage clamping requiring stable component supply and consistent DO-35 mechanical form factor.

Supply support for 1N5986B_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 components before its acquisition by ON Semiconductor in 2016; its legacy Zener diodes remain widely deployed in industrial and automotive systems.

The 1N5985B–1N6025B series was designed for general-purpose voltage regulation and reference applications demanding tight tolerance, stable thermal behavior, and DO-35 reliability in cost-sensitive analog subsystems.

FAQ

What is the exact Zener voltage range for 1N5986B_T50R at 25°C?

The 1N5986B_T50R has a guaranteed Zener voltage range of 2.565 V (minimum) to 2.595 V (maximum) at I_Z = 5 mA and T_A = 25°C, with typical value 2.58 V. This 30 mV span reflects the ±5% tolerance applied to the nominal 2.565 V rating, and is measured under thermal equilibrium conditions with 3/8″ lead length.

Does 1N5986B_T50R support operation above 75°C ambient?

Yes, the 1N5986B_T50R is rated for operation from –65°C to +200°C junction temperature. Power dissipation must be derated linearly at 4.0 mW/°C above 75°C lead temperature; for example, at T_L = 100°C, maximum allowable P_D is reduced to 400 mW. Thermal design must account for actual lead temperature, not ambient.

What is the forward voltage specification for 1N5986B_T50R?

The 1N5986B_T50R has a maximum forward voltage (V_F) of 1.2 V at forward current (I_F) = 200 mA, per the Absolute Maximum Ratings table. This parameter applies only when the device is operated in forward conduction mode - not during normal Zener regulation, which requires reverse bias.

How is the cathode identified on 1N5986B_T50R?

The cathode of the 1N5986B_T50R is marked by a visible color band on the DO-35 glass body. Per Fairchild's top-marking specification, this band aligns with the third line of marking ("6B") and must be oriented toward the higher-potential node in Zener regulator configurations to ensure correct reverse-bias operation.

Is 1N5986B_T50R suitable for use in life support equipment?

No - Fairchild's Life Support Policy explicitly states that 1N5986B_T50R is not authorized for use as a critical component in life support devices or systems without express written approval. Its qualification level does not meet the fault-tolerance, traceability, or audit requirements mandated for such applications.

1N5986B_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):: 2.7 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 75 µA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N5986B_T50R FAQ

1.How can I place an order for 1N5986B_T50R through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5986B_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 1N5986B_T50R reliable?

The price and inventory of 1N5986B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5986B_T50R is usually 5 days.

3.What payment methods are accepted for 1N5986B_T50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5986B_T50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5986B_T50R?

1N5986B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5986B_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 1N5986B_T50R?

For technical support, including 1N5986B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5986B_T50R requirements.

6.How does Aetrix verify that 1N5986B_T50R is sourced from the original manufacturer or authorized distributors?

All 1N5986B_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 1N5986B_T50R meets industry standards.

7.What is the process for return or replacement of 1N5986B_T50R?

All 1N5986B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5986B_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 1N5986B_T50R part is unused and in its original packaging.

Return procedure for 1N5986B_T50R:

1.Submit a request within 90 days.

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

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