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

onsemi 1N756A_T50A

Name: 1N756A_T50A
Brand: onsemi
SKU: 1N756A_T50A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N756A_T50A

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N756A_T50A.pdf

Description:: DIODE ZENER 8.2V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:5,219

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Product details

Overview

1N756A_T50A from Fairchild Semiconductor is a 5.6 V, ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at ≤75°C lead temperature, with 8 Ω dynamic impedance at 20 mA test current and 0.1 µA reverse leakage at 1 V. It provides precise voltage regulation in low-power reference and protection circuits.

For engineers reviewing the 1N756A_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, junction temperature limits, and DO-35 mechanical compatibility with through-hole PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference diode, relying on controlled avalanche breakdown in the reverse-biased p-n junction. Its 5.6 V nominal zener voltage falls within the region of lowest temperature coefficient for silicon Zeners, enabling stable regulation across -65°C to +200°C operating range.

The 1N756A_T50A exhibits 8 Ω dynamic impedance at I_Z = 20 mA and maintains ≤0.1 µA reverse leakage at V_R = 1 V, supporting low-current biasing and high-impedance sensing applications without significant error contribution.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z @ I_Z = 20 mA	7.79 V (min) to 8.61 V (max); defines usable regulation band under standard test condition
Tolerance	±5%; sets absolute accuracy limit for voltage reference use without trimming
Z_Z @ 20 mA	8 Ω; determines output impedance and load regulation sensitivity
P_D @ T_L ≤ 75°C	500 mW; maximum continuous power before thermal derating begins
I_ZM	45 mA; peak DC zener current before exceeding power limit at 25°C ambient
I_R @ V_R = 1 V	≤0.1 µA; ensures negligible leakage in high-impedance bias networks
T_J/T_STG	-65°C to +200°C; supports operation in harsh industrial and automotive under-hood environments

Pinout & Package

DO-35 glass axial package with cathode band marking; leads are tinned copper alloy, 3/8″ length specified for thermal rating compliance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener reference ground node	Connected to circuit common when used in shunt regulation; must sink full load current
Cathode	Reverse-biased Zener terminal / regulated output node	Provides stable voltage referenced to anode; marked by color band on DO-35 body

Key Features

Feature	Design Value
Low dynamic impedance	8 Ω at 20 mA enables tight regulation under varying load currents
Stable 5.6 V nominal point	Optimized for near-zero TC operation, minimizing drift over temperature
High-temperature capability	200°C max junction temperature supports under-hood and industrial control use
DO-35 mechanical standardization	Enables drop-in replacement across legacy Zener families with identical footprint

Applications

Power Supply Voltage Reference	Overvoltage Protection Clamp
Use Scenario: Providing stable 5.6 V reference for linear regulator feedback or ADC reference divider networks. IC Role / Device Role / Timing Role: Shunt voltage reference element establishing precision bias point. Use Value: ±5% tolerance and 8 Ω Z_Z ensure reference stability within 15 mV under 1 mA load variation.	Use Scenario: Clamping transient surges on low-voltage signal lines (e.g., sensor inputs, logic I/O). IC Role / Device Role / Timing Role: Reverse-biased clamping diode diverting excess energy to ground. Use Value: 0.1 µA leakage at 1 V prevents signal distortion in high-Z analog paths.
Temperature-Stable Bias Generator	Current-Limited LED Driver Reference
Use Scenario: Generating bias current for op-amp input stages requiring minimal TC drift. IC Role / Device Role / Timing Role: Zener-based current source reference with inherent TC compensation. Use Value: Near-zero TC at 5.6 V reduces bias current drift to <50 ppm/°C over -40°C to +85°C.	Use Scenario: Setting constant current for indicator LEDs in panel meters or status displays. IC Role / Device Role / Timing Role: Series-pass voltage reference controlling emitter-base voltage of current-setting transistor. Use Value: 500 mW rating allows sustained 45 mA operation, sufficient for driving multiple LEDs via resistor-divider.

Power Supply Voltage Reference

Overvoltage Protection Clamp

Use Scenario: Providing stable 5.6 V reference for linear regulator feedback or ADC reference divider networks.

IC Role / Device Role / Timing Role: Shunt voltage reference element establishing precision bias point.

Use Value: ±5% tolerance and 8 Ω Z_Z ensure reference stability within 15 mV under 1 mA load variation.

Use Scenario: Clamping transient surges on low-voltage signal lines (e.g., sensor inputs, logic I/O).

IC Role / Device Role / Timing Role: Reverse-biased clamping diode diverting excess energy to ground.

Use Value: 0.1 µA leakage at 1 V prevents signal distortion in high-Z analog paths.

Temperature-Stable Bias Generator

Current-Limited LED Driver Reference

Use Scenario: Generating bias current for op-amp input stages requiring minimal TC drift.

IC Role / Device Role / Timing Role: Zener-based current source reference with inherent TC compensation.

Use Value: Near-zero TC at 5.6 V reduces bias current drift to <50 ppm/°C over -40°C to +85°C.

Use Scenario: Setting constant current for indicator LEDs in panel meters or status displays.

IC Role / Device Role / Timing Role: Series-pass voltage reference controlling emitter-base voltage of current-setting transistor.

Use Value: 500 mW rating allows sustained 45 mA operation, sufficient for driving multiple LEDs via resistor-divider.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4734A	Same 5.6 V nominal, but ±5% tolerance and 5 W power rating in DO-41 package	Higher power handling requires larger PCB footprint and different thermal layout	Select when >500 mW dissipation or higher surge immunity is required
BZX55-C5V6	5.6 V ±5%, 500 mW, DO-35, but tighter 2 µA IR @ VR = 1 V vs. 0.1 µA for 1N756A_T50A	Lower leakage makes BZX55-C5V6 preferable in ultra-low-current bias networks	Select when sub-microampere leakage is critical, e.g., battery-powered sensor references

Compared with 1N4734A and BZX55-C5V6, the 1N756A_T50A offers optimal balance of DO-35 compatibility, 500 mW rating, and ultra-low 0.1 µA leakage-making it ideal for space-constrained, low-power, high-stability analog references where thermal mass and board area are constrained.

Availability

1N756A_T50A is available at Aetrix Electronics and suitable for voltage reference design, overvoltage clamp circuits, and temperature-stable bias generation requiring stable component supply and long-term obsolescence management.

Supply support for 1N756A_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

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 1N756A_T50A belongs to Fairchild's legacy 1N7xxA Zener series, designed for general-purpose precision voltage regulation in cost-sensitive, high-reliability industrial and consumer electronics.

FAQ

What is the nominal zener voltage of the 1N756A_T50A?

The 1N756A_T50A has a nominal zener voltage of 8.2 V, with a guaranteed range of 7.79 V (min) to 8.61 V (max) at 20 mA test current and ±5% tolerance. This value is measured under thermal equilibrium conditions with 3/8″ lead length at 30°C lead temperature, per Fairchild Rev. D1 specification.

Does the 1N756A_T50A have a specified forward voltage?

Yes-the 1N756A_T50A specifies a maximum forward voltage (V_F) of 1.5 V at 200 mA forward current. This parameter is relevant for applications where the device may experience brief forward conduction during transient events or bidirectional clamping configurations.

What is the maximum power dissipation for the 1N756A_T50A?

The 1N756A_T50A 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 dissipation at 200°C junction temperature per Absolute Maximum Ratings table.

Is the 1N756A_T50A suitable for high-temperature environments?

Yes-the 1N756A_T50A supports an operating and storage temperature range of -65°C to +200°C. Its DO-35 glass package and silicon die construction enable reliable performance in under-hood automotive, industrial motor controls, and downhole instrumentation where ambient temperatures exceed 125°C.

How is the cathode identified on the 1N756A_T50A package?

The cathode of the 1N756A_T50A is marked by a distinct color band on the DO-35 glass body. Per Fairchild top-marking specification, this band aligns with Line 3 "A" and corresponds to the cathode end-critical for correct polarity in shunt regulation and clamping configurations.

1N756A_T50A Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 8.2 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 8 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N756A_T50A FAQ

1.How can I place an order for 1N756A_T50A through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N756A_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 1N756A_T50A reliable?

The price and inventory of 1N756A_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N756A_T50A is usually 5 days.

3.What payment methods are accepted for 1N756A_T50A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N756A_T50A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N756A_T50A?

1N756A_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N756A_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 1N756A_T50A?

For technical support, including 1N756A_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N756A_T50A requirements.

6.How does Aetrix verify that 1N756A_T50A is sourced from the original manufacturer or authorized distributors?

All 1N756A_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 1N756A_T50A meets industry standards.

7.What is the process for return or replacement of 1N756A_T50A?

All 1N756A_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N756A_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 1N756A_T50A part is unused and in its original packaging.

Return procedure for 1N756A_T50A:

1.Submit a request within 90 days.

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

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