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

onsemi 1N751A_S00Z

Name: 1N751A_S00Z
Brand: onsemi
SKU: 1N751A_S00Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N751A_S00Z

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N751A_S00Z.pdf

Description:: DIODE ZENER 5.1V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:8,146

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Product details

Overview

1N751A_S00Z from Fairchild Semiconductor is a 5.1 V, ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 17 Ω dynamic impedance at 20 mA and 20 µA reverse leakage at 1 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N751A_S00Z datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode band identification, and DO-35 mechanical compatibility in space-constrained PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when cathode voltage exceeds anode by ≥5.1 V. Its 5% tolerance and 17 Ω impedance at 20 mA support stable regulation under moderate load variation and ambient temperature shifts up to +200°C.

The DO-35 glass package features a visible cathode band and 3/8″ lead length for standardized axial mounting and thermal management. Power derating begins at 75°C at 4.0 mW/°C, limiting maximum continuous current to ~70 mA at 125°C per absolute ratings.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.85 V (min) to 5.36 V (max) at I_Z = 20 mA - defines usable regulation window for 5.1 V nominal reference
Dynamic Impedance (Z_Z)	17 Ω max at I_Z = 20 mA - determines output voltage deviation under load current changes
Max Reverse Leakage (I_R)	1 µA at V_R = 1 V - ensures minimal quiescent current in standby bias networks
Power Dissipation (P_D)	500 mW at T_L ≤ 75°C - sets upper limit for DC power handling before thermal derating applies
Operating Temperature	–65°C to +200°C - supports deployment in automotive engine compartments and industrial control enclosures
Forward Voltage (V_F)	≤1.5 V at I_F = 200 mA - enables use as low-drop rectifier or clamp in dual-role circuits

Pinout & Package

DO-35 glass axial package with cathode identified by a single color band on the body; leads are unmarked and electrically symmetric except for polarity - anode and cathode are distinguished solely by band position.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reverse-bias reference terminal	Connected to lower-potential node; reverse current flows into cathode when V_KA ≥ V_Z
Cathode	Reference output terminal	Marked with color band; supplies regulated voltage referenced to anode; must be held ≥ V_Z above anode

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables predictable regulation without post-production trimming in cost-sensitive consumer power supplies
DO-35 glass encapsulation	Provides hermetic sealing and stable long-term V_Z drift under humidity and thermal cycling
500 mW power rating at 75°C	Supports direct replacement of legacy 1N7xxA series in existing through-hole designs without layout change
1 µA reverse leakage at 1 V	Minimizes error in high-impedance voltage divider biasing of op-amp references and sensor interfaces

Applications

Industrial Sensor Biasing	USB Port Overvoltage Clamp
Use Scenario: Providing stable 5.1 V reference for bridge sensor excitation in pressure transducers operating from 12 V rails. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining constant voltage across Wheatstone bridge legs. Use Value: Low 17 Ω Z_Z minimizes bridge imbalance error caused by supply ripple and load variation.	Use Scenario: Clamping transient overvoltage on USB VBUS line during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Passive crowbar element conducting above 5.36 V to divert surge energy to ground. Use Value: 1 µA leakage at 1 V prevents false triggering while 500 mW rating absorbs 100 ns/1 kV pulses per IEC 61000-4-2 Level 4.
Low-Power Microcontroller Reset Circuit	Legacy Analog Meter Calibration Reference
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using resistor-divider + capacitor delay. IC Role / Device Role / Timing Role: Precision voltage reference defining logic-high threshold for RC-based reset generator. Use Value: Tight 5% tolerance ensures consistent reset assertion across production batches without calibration.	Use Scenario: Serving as factory-calibrated voltage standard in handheld multimeters during end-of-line functional test. IC Role / Device Role / Timing Role: Stable DC reference source for ADC full-scale adjustment and offset nulling. Use Value: –65°C to +200°C operating range allows calibration stability across environmental stress screening chambers.

Industrial Sensor Biasing

USB Port Overvoltage Clamp

Use Scenario: Providing stable 5.1 V reference for bridge sensor excitation in pressure transducers operating from 12 V rails.

IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining constant voltage across Wheatstone bridge legs.

Use Value: Low 17 Ω Z_Z minimizes bridge imbalance error caused by supply ripple and load variation.

Use Scenario: Clamping transient overvoltage on USB VBUS line during hot-plug events or ESD strikes.

IC Role / Device Role / Timing Role: Passive crowbar element conducting above 5.36 V to divert surge energy to ground.

Use Value: 1 µA leakage at 1 V prevents false triggering while 500 mW rating absorbs 100 ns/1 kV pulses per IEC 61000-4-2 Level 4.

Low-Power Microcontroller Reset Circuit

Legacy Analog Meter Calibration Reference

Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers using resistor-divider + capacitor delay.

IC Role / Device Role / Timing Role: Precision voltage reference defining logic-high threshold for RC-based reset generator.

Use Value: Tight 5% tolerance ensures consistent reset assertion across production batches without calibration.

Use Scenario: Serving as factory-calibrated voltage standard in handheld multimeters during end-of-line functional test.

IC Role / Device Role / Timing Role: Stable DC reference source for ADC full-scale adjustment and offset nulling.

Use Value: –65°C to +200°C operating range allows calibration stability across environmental stress screening chambers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4733A	5.1 V nominal, 5% tolerance, but 1.0 W power rating and DO-41 package	Higher power handling suits higher-current regulation; larger DO-41 footprint requires PCB redesign	Select when >500 mW dissipation or improved thermal margin is required
BZX55C5V1	5.1 V, 5% tolerance, 500 mW, DO-35, but tighter 10 µA leakage at 1 V and different marking convention	Lower leakage benefits ultra-low-power IoT sensor nodes; same package enables drop-in replacement	Prefer where sub-µA standby current is critical and sourcing from modern inventory is prioritized

Compared with 1N751A_S00Z, 1N4733A offers higher power but requires board rework, while BZX55C5V1 matches package and power but improves leakage by 10× - making it suitable for battery-powered systems where 1N751A_S00Z's 1 µA is marginal.

Availability

1N751A_S00Z is available at Aetrix Electronics and suitable for industrial sensor biasing, USB port protection, microcontroller reset generation, and analog meter calibration requiring stable component supply and long-lifecycle support.

Supply support for 1N751A_S00Z 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 1N751A_S00Z belongs to Fairchild's legacy 1N7xxA Zener diode family, designed for general-purpose voltage regulation and reference in cost-sensitive, through-hole mounted industrial and consumer electronics.

FAQ

What is the exact Zener voltage range for 1N751A_S00Z at 20 mA test current?

The 1N751A_S00Z has a guaranteed Zener voltage range of 4.85 V (minimum) to 5.36 V (maximum) when tested at I_Z = 20 mA and T_A = 25°C. This 5.1 V nominal rating with ±5% tolerance is confirmed in the Fairchild Rev. D1 datasheet electrical characteristics table and applies to all units marked "51A" on the second and third lines of the DO-35 top mark.

Does 1N751A_S00Z have a specified forward voltage, and what is its maximum value?

Yes, the 1N751A_S00Z specifies a maximum forward voltage (V_F) of 1.5 V at forward current (I_F) = 200 mA. This parameter is explicitly listed in the "Notes" section of the Fairchild datasheet and confirms usability in dual-role applications such as clamping and low-current rectification where forward conduction occurs.

What does the "S00Z" suffix in 1N751A_S00Z indicate, and how does it relate to packaging or marking?

The "S00Z" suffix denotes Fairchild's internal manufacturing code for the standard DO-35 glass package variant with cathode band marking and 3/8″ lead length. It appears in top-marking documentation as part of the full orderable part number and corresponds to the "1N751A" base device with no functional deviation from the base 1N751A specification.

Can 1N751A_S00Z be used in surface-mount designs?

No, the 1N751A_S00Z is exclusively offered in the axial DO-35 glass package and is not available in SMD variants such as SOD-123 or DO-213AA. Its 3/8″ lead length and glass body require through-hole mounting; any surface-mount implementation would require a redesign using a functionally similar but physically compatible SMD Zener like MMBZ5231B.

What is the maximum allowable junction temperature for continuous operation of 1N751A_S00Z?

The 1N751A_S00Z has a maximum junction and storage temperature rating of +200°C, as stated in the Absolute Maximum Ratings table. This allows reliable operation in high-temperature environments such as automotive under-hood modules or industrial motor drive controls, provided power dissipation remains within derated limits above 75°C.

1N751A_S00Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 5.1 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 17 Ohms

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

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

Operating Temperature:: -65°C ~ 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N751A_S00Z FAQ

1.How can I place an order for 1N751A_S00Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N751A_S00Z 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 1N751A_S00Z reliable?

The price and inventory of 1N751A_S00Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N751A_S00Z is usually 5 days.

3.What payment methods are accepted for 1N751A_S00Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N751A_S00Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N751A_S00Z?

1N751A_S00Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N751A_S00Z 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 1N751A_S00Z?

For technical support, including 1N751A_S00Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N751A_S00Z requirements.

6.How does Aetrix verify that 1N751A_S00Z is sourced from the original manufacturer or authorized distributors?

All 1N751A_S00Z 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 1N751A_S00Z meets industry standards.

7.What is the process for return or replacement of 1N751A_S00Z?

All 1N751A_S00Z units undergo pre-shipment inspection (PSI). If there is an issue with 1N751A_S00Z, 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 1N751A_S00Z part is unused and in its original packaging.

Return procedure for 1N751A_S00Z:

1.Submit a request within 90 days.

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

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