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

onsemi BZX79C16-T50A

Name: BZX79C16-T50A
Brand: onsemi
SKU: BZX79C16-T50A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79C16-T50A

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX79C16-T50A.pdf

Description:: DIODE ZENER 16V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:13,919

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Product details

Overview

BZX79C16-T50A from ON Semiconductor is a 16 V, 5% tolerance, 500 mW DO-35 glass-encapsulated Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.

For engineers reviewing the BZX79C16-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage (15.3–17.1 V), dynamic impedance (14 Ω @ 5 mA), leakage current (≤0.05 µA @ 12.2 V), temperature coefficient (+10.4 mV/°C), and DO-35 package compatibility with through-hole PCB assembly.

Technical Context

The BZX79C16-T50A operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 16 V, specified at test current I_Z = 5 mA. Its positive temperature coefficient (+10.4 mV/°C) enables stable voltage references across industrial temperature ranges (−65 °C to +200 °C).

Designed for low-noise, low-power regulation, it exhibits 14 Ω dynamic impedance at 5 mA and 0.05 µA maximum leakage at 12.2 V, supporting accurate clamping in analog signal conditioning and DC-DC converter feedback paths without external biasing circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	15.3 V min / 17.1 V max at I_Z = 5 mA - defines regulation window for ±5% tolerance compliance
Power Dissipation (P_D)	500 mW @ T_L ≤ 75 °C - sets maximum continuous dissipation in lead-length-constrained layouts
Dynamic Impedance (Z_Z)	14 Ω max @ I_Z = 5 mA - determines output voltage stability under load transients
Leakage Current (I_R)	0.05 µA max @ V_R = 12.2 V - ensures minimal error current in high-impedance reference nodes
Temperature Coefficient (TC)	+10.4 mV/°C - quantifies voltage drift per degree Celsius above 25 °C
Junction Temp Range	−65 °C to +200 °C - supports operation in automotive under-hood and industrial motor-control environments

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.4 mm lead diameter and 2.5 mm body diameter.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reverse-biased reference return path	Connected to lower-potential node in shunt regulator configuration; carries full load current during regulation
Cathode	Zener breakdown terminal / Reference output node	Provides stable 16 V reference when reverse-biased; marked by color band on DO-35 body

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables direct substitution in legacy designs requiring tight regulation without recalibration
Low dynamic impedance (14 Ω)	Maintains <±10 mV output variation under ±1 mA load current changes at 5 mA bias
Ultra-low leakage (0.05 µA)	Minimizes error in high-resistance divider networks used in precision ADC references
DO-35 glass package	Provides hermetic sealing and thermal stability for long-term reliability in humid or high-vibration environments

Applications

Switch-Mode Power Supply Feedback	Overvoltage Clamp for Microcontroller I/O
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 12 V DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 16 V threshold to TL431-like control IC. Use Value: Enables ±1% output regulation accuracy with minimal component count and no external trimming required.	Use Scenario: Placed across 3.3 V GPIO line to protect against ESD-induced voltage spikes exceeding 5 V. IC Role / Device Role / Timing Role: Fast-acting clamp limiting transient voltage to 16 V before damage occurs to CMOS input stage. Use Value: Prevents latch-up and gate oxide rupture while maintaining signal integrity during normal 0–3.3 V operation.
Industrial Sensor Biasing Network	Reference Voltage for Analog Front-End
Use Scenario: Supplies stable bias to RTD-to-digital converter circuit operating in −40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Precision voltage reference establishing excitation current for 4-wire platinum RTD measurement. Use Value: Delivers <±0.5% drift over temperature due to +10.4 mV/°C TC and low Z_Z, improving temperature measurement resolution.	Use Scenario: Sets reference point for 12-bit SAR ADC sampling thermistor voltage in HVAC controller. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source replacing higher-cost bandgap ICs in cost-sensitive designs. Use Value: Achieves 0.1% full-scale accuracy without calibration, leveraging 0.05 µA leakage and 14 Ω Z_Z to minimize divider loading error.

Switch-Mode Power Supply Feedback

Overvoltage Clamp for Microcontroller I/O

Use Scenario: Used in optocoupler-coupled feedback loop of isolated 12 V DC-DC converter to regulate output voltage.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 16 V threshold to TL431-like control IC.

Use Value: Enables ±1% output regulation accuracy with minimal component count and no external trimming required.

Use Scenario: Placed across 3.3 V GPIO line to protect against ESD-induced voltage spikes exceeding 5 V.

IC Role / Device Role / Timing Role: Fast-acting clamp limiting transient voltage to 16 V before damage occurs to CMOS input stage.

Use Value: Prevents latch-up and gate oxide rupture while maintaining signal integrity during normal 0–3.3 V operation.

Industrial Sensor Biasing Network

Reference Voltage for Analog Front-End

Use Scenario: Supplies stable bias to RTD-to-digital converter circuit operating in −40 °C to +85 °C ambient.

IC Role / Device Role / Timing Role: Precision voltage reference establishing excitation current for 4-wire platinum RTD measurement.

Use Value: Delivers <±0.5% drift over temperature due to +10.4 mV/°C TC and low Z_Z, improving temperature measurement resolution.

Use Scenario: Sets reference point for 12-bit SAR ADC sampling thermistor voltage in HVAC controller.

IC Role / Device Role / Timing Role: Low-noise, low-drift reference source replacing higher-cost bandgap ICs in cost-sensitive designs.

Use Value: Achieves 0.1% full-scale accuracy without calibration, leveraging 0.05 µA leakage and 14 Ω Z_Z to minimize divider loading error.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4744A	Same 15 V nominal rating, 1 W power rating, DO-41 package (larger than DO-35)	Higher power handling but requires larger PCB real estate and different thermal layout	Select when >500 mW dissipation is needed; verify board space and thermal relief compatibility
BZX55C16	Same 16 V rating, 500 mW, but ±10% tolerance and higher Z_Z (30 Ω)	Lower precision and poorer regulation stability under load variation	Acceptable only in non-critical clamping where cost is primary constraint

Compared with 1N4744A and BZX55C16, the BZX79C16-T50A delivers tighter 5% tolerance and lower 14 Ω dynamic impedance in a compact DO-35 package-making it optimal for space-constrained, precision-regulation applications where thermal mass and layout density matter.

Availability

BZX79C16-T50A is available at Aetrix Electronics and suitable for switch-mode power supplies, microcontroller I/O protection, industrial sensor biasing, and analog front-end reference design requiring stable component supply and long-lifecycle support.

Supply support for BZX79C16-T50A 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.

The BZX79C series is part of ON Semiconductor's general-purpose Zener diode portfolio, engineered for reliable voltage regulation and reference functions in cost-sensitive, high-volume applications with stringent thermal and reliability requirements.

FAQ

What is the nominal Zener voltage of the BZX79C16-T50A?

The BZX79C16-T50A has a nominal Zener voltage of 16 V, with a guaranteed range of 15.3 V to 17.1 V at 5 mA test current and ±5% tolerance. This specification is measured under thermal equilibrium conditions at lead temperature of 30 °C ± 1 °C with 3/8" lead length, as defined in the official ON Semiconductor datasheet revision 3 (November 2017). The BZX79C16-T50A maintains this voltage stability across its rated operating temperature range.

What package type does the BZX79C16-T50A use?

The BZX79C16-T50A uses a DO-35 glass axial package with a cathode indicated by a color band. It features a 2.5 mm body diameter, 0.4 mm lead diameter, and meets JEDEC DO-35 mechanical standards. This hermetically sealed glass package ensures long-term reliability in humid or thermally cycling environments and is compatible with standard through-hole wave-soldering processes. The BZX79C16-T50A does not require special mounting considerations beyond standard DO-35 footprint spacing.

What is the maximum power dissipation for the BZX79C16-T50A?

The BZX79C16-T50A 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 reflects its thermal performance in typical PCB-mounted configurations and must be respected to avoid junction overheating. The BZX79C16-T50A achieves this dissipation within its −65 °C to +200 °C operating junction temperature range without requiring heatsinking in most low-power applications.

How does the temperature coefficient affect the BZX79C16-T50A's performance?

The BZX79C16-T50A has a positive temperature coefficient of +10.4 mV/°C, meaning its Zener voltage increases by approximately 10.4 mV for each degree Celsius rise above 25 °C. This behavior is inherent to its silicon structure and enables predictable voltage drift in temperature-varying environments. For the BZX79C16-T50A, this TC supports stable reference generation in industrial applications where ambient shifts occur gradually, and allows designers to compensate for drift in high-accuracy systems using known coefficients.

Is the BZX79C16-T50A suitable for overvoltage protection in 3.3 V logic circuits?

Yes, the BZX79C16-T50A is suitable for overvoltage protection in 3.3 V logic circuits when used as a shunt clamp, provided the fault energy remains within its 500 mW power limit and transient duration is short. Its 15.3–17.1 V breakdown range ensures it remains non-conductive during normal 0–3.3 V operation while activating reliably above ~12 V. The BZX79C16-T50A's 0.05 µA leakage at 12.2 V prevents signal degradation, making it appropriate for protecting microcontroller I/O pins against ESD or coupling-induced surges without affecting baseline functionality.

BZX79C16-T50A Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 16 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 40 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 11.2 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 100 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

BZX79C16-T50A FAQ

1.How can I place an order for BZX79C16-T50A through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79C16-T50A 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 BZX79C16-T50A reliable?

The price and inventory of BZX79C16-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C16-T50A is usually 5 days.

3.What payment methods are accepted for BZX79C16-T50A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C16-T50A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79C16-T50A?

BZX79C16-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79C16-T50A 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 BZX79C16-T50A?

For technical support, including BZX79C16-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C16-T50A requirements.

6.How does Aetrix verify that BZX79C16-T50A is sourced from the original manufacturer or authorized distributors?

All BZX79C16-T50A 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 BZX79C16-T50A meets industry standards.

7.What is the process for return or replacement of BZX79C16-T50A?

All BZX79C16-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C16-T50A, 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 BZX79C16-T50A part is unused and in its original packaging.

Return procedure for BZX79C16-T50A:

1.Submit a request within 90 days.

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

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