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

onsemi 1N966BTR

Name: 1N966BTR
Brand: onsemi
SKU: 1N966BTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N966BTR

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N966BTR.pdf

Description:: DIODE ZENER 16V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:2,646

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Product details

Overview

1N966BTR from Fairchild Semiconductor is a 5% tolerance, 16 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, and used for voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N966BTR datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage (15.2–16.8 V), dynamic impedance (19 Ω at 5 mA), leakage current (0.25 μA at 12.2 V), maximum zener current (5 mA), and thermal stability across industrial temperature ranges.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable voltage under varying load and line conditions. Its 5% tolerance and tight V_Z distribution (min 15.2 V, typ 16 V, max 16.8 V at I_Z = 5 mA) support precision biasing in analog signal chains and power supply feedback networks.

Designed for through-hole mounting in DO-35 glass case with cathode band marking, it delivers low dynamic impedance (19 Ω) and minimal temperature coefficient - critical for voltage references in instrumentation, sensor conditioning, and overvoltage protection circuits where thermal drift must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (Nominal)	16 V - precise DC reference voltage at 5 mA test current
V_Z Range	15.2 V to 16.8 V - ensures ±5% tolerance compliance for stable regulation
Z_Z @ I_Z	19 Ω - low dynamic impedance enables tight voltage regulation under load variation
I_R @ V_R	0.25 μA at 12.2 V - ultra-low leakage preserves accuracy in high-impedance bias networks
P_D	500 mW @ T_L ≤ 75°C - defines maximum continuous power handling before thermal derating
T_J/T_STG	–65°C to +200°C - supports operation in harsh environments including automotive under-hood and industrial controls

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB layout beyond standard diode polarity placement.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reverse-biased reference node	Connected to lower potential side in Zener configuration; forms regulated output node when cathode is tied to supply
Cathode	Zener breakdown terminal / Voltage reference output	Marked with color band; connected to higher potential side; provides stable 16 V reference relative to anode

Key Features

Feature	Design Value
±5% V_Z tolerance	Enables direct replacement without recalibration in fixed-voltage reference designs
19 Ω dynamic impedance	Minimizes output voltage shift under ±1 mA load current changes in feedback loops
0.25 μA reverse leakage	Prevents significant error in high-resistance divider networks (e.g., >1 MΩ)
DO-35 glass package	Provides hermetic sealing and long-term parameter stability in humid or corrosive environments

Applications

Industrial Sensor Signal Conditioning	Low-Power Voltage Reference
Use Scenario: Biasing op-amp input stages and setting gain in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Provides stable 16 V reference for excitation and offset trimming of bridge sensors. Use Value: Maintains <±0.5% reference drift over –40°C to +85°C due to low tempco and 19 Ω Z_Z.	Use Scenario: Generating precise reference for ADCs and DACs in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Serves as primary shunt reference in ultra-low-quiescent LDO feedback paths. Use Value: 0.25 μA leakage ensures >10-year battery life in 10 μA sleep-mode systems.
Overvoltage Clamp Protection	Power Supply Feedback Divider
Use Scenario: Protecting microcontroller I/O pins against transient surges on 12 V rail interfaces. IC Role / Device Role / Timing Role: Shunts excess energy above 16.8 V to ground during ESD or load-dump events. Use Value: Fast response (<1 ns) and 500 mW surge capability limit clamped voltage to safe levels.	Use Scenario: Setting output voltage in isolated flyback converter feedback loop with optocoupler. IC Role / Device Role / Timing Role: Defines regulated output via resistive divider tied to TL431 reference input. Use Value: Tight 16 V ±5% tolerance reduces output voltage error to ±0.8% before compensation.

Industrial Sensor Signal Conditioning

Low-Power Voltage Reference

Use Scenario: Biasing op-amp input stages and setting gain in 4–20 mA transmitter front-ends.

IC Role / Device Role / Timing Role: Provides stable 16 V reference for excitation and offset trimming of bridge sensors.

Use Value: Maintains <±0.5% reference drift over –40°C to +85°C due to low tempco and 19 Ω Z_Z.

Use Scenario: Generating precise reference for ADCs and DACs in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Serves as primary shunt reference in ultra-low-quiescent LDO feedback paths.

Use Value: 0.25 μA leakage ensures >10-year battery life in 10 μA sleep-mode systems.

Overvoltage Clamp Protection

Power Supply Feedback Divider

Use Scenario: Protecting microcontroller I/O pins against transient surges on 12 V rail interfaces.

IC Role / Device Role / Timing Role: Shunts excess energy above 16.8 V to ground during ESD or load-dump events.

Use Value: Fast response (<1 ns) and 500 mW surge capability limit clamped voltage to safe levels.

Use Scenario: Setting output voltage in isolated flyback converter feedback loop with optocoupler.

IC Role / Device Role / Timing Role: Defines regulated output via resistive divider tied to TL431 reference input.

Use Value: Tight 16 V ±5% tolerance reduces output voltage error to ±0.8% before compensation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4744A	14 V nominal, 10% tolerance, 1 W rating, DO-41 package	Higher power but looser tolerance; requires layout change for larger DO-41 footprint	Choose when higher surge energy handling is needed and 14 V reference suffices
BZX55C16	16 V nominal, 5% tolerance, 500 mW, DO-35 package, tighter ZZK spec	Same V_Z and package; lower knee impedance (25 Ω vs 19 Ω) affects low-current regulation	Prefer for new designs needing RoHS-compliant alternative with identical mechanical fit

Compared with 1N966BTR, the 1N4744A offers higher power but sacrifices voltage precision and package compatibility, while the BZX55C16 matches V_Z and form factor but exhibits higher dynamic impedance below 1 mA - making 1N966BTR optimal for low-current, high-stability reference use cases.

Availability

1N966BTR is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power voltage reference, overvoltage clamp protection, and power supply feedback divider applications requiring stable component supply and long-lifecycle support.

Supply support for 1N966BTR 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 designed for general-purpose, high-reliability Zener voltage regulation in industrial, automotive, and consumer electronics where stable, low-cost reference performance is required.

FAQ

What is the nominal Zener voltage of the 1N966BTR?

The nominal Zener voltage of the 1N966BTR is 16 V, measured at a test current of 5 mA. The actual voltage range is specified as 15.2 V (minimum) to 16.8 V (maximum) to meet ±5% tolerance requirements. This value is confirmed in the Fairchild 1N957B–1N979B datasheet Rev. F1 and applies strictly under thermal equilibrium conditions at lead temperature ≤30°C.

What is the maximum power dissipation rating for the 1N966BTR?

The 1N966BTR has a maximum power dissipation of 500 mW at lead temperature (T_L) ≤75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C. This rating assumes proper heat sinking through leads and accounts for ambient and board-level thermal resistance - critical for sustained operation in enclosed industrial enclosures.

Does the 1N966BTR have a defined cathode marking?

Yes, the 1N966BTR uses a color band on the DO-35 glass body to denote the cathode terminal, consistent with industry-standard diode polarity marking. The band aligns with the third-line marking "B" in the top-marking scheme (F logo / "66" / "B"), confirming cathode orientation for correct PCB placement in reverse-bias Zener configurations.

What is the Zener impedance of the 1N966BTR and why does it matter?

The 1N966BTR exhibits a Zener impedance (Z_Z) of 19 Ω at I_Z = 5 mA. This low dynamic impedance ensures minimal voltage variation under changing load currents - essential for maintaining accuracy in feedback networks and precision biasing. It directly impacts regulation error: a 1 mA load shift causes only ~19 mV deviation in output voltage.

Is the 1N966BTR suitable for automotive under-hood applications?

Yes, the 1N966BTR supports operating temperatures from –65°C to +200°C and is qualified for industrial-grade reliability. While not AEC-Q101 certified as a standalone part, its wide T_J range and hermetic DO-35 glass package make it suitable for non-safety-critical under-hood functions such as sensor biasing and auxiliary supply monitoring - provided system-level qualification is completed per OEM requirements.

1N966BTR 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):: 16 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 17 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 12.2 V

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

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N966BTR FAQ

1.How can I place an order for 1N966BTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N966BTR 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 1N966BTR reliable?

The price and inventory of 1N966BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N966BTR is usually 5 days.

3.What payment methods are accepted for 1N966BTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N966BTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N966BTR?

1N966BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N966BTR 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 1N966BTR?

For technical support, including 1N966BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N966BTR requirements.

6.How does Aetrix verify that 1N966BTR is sourced from the original manufacturer or authorized distributors?

All 1N966BTR 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 1N966BTR meets industry standards.

7.What is the process for return or replacement of 1N966BTR?

All 1N966BTR units undergo pre-shipment inspection (PSI). If there is an issue with 1N966BTR, 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 1N966BTR part is unused and in its original packaging.

Return procedure for 1N966BTR:

1.Submit a request within 90 days.

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

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