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

onsemi 1N5229B_S00Z

Name: 1N5229B_S00Z
Brand: onsemi
SKU: 1N5229B_S00Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5229B_S00Z

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5229B_S00Z.pdf

Description:: DIODE ZENER 4.3V 500MW DO35

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Product details

Overview

1N5229B_S00Z from ON Semiconductor is a 4.3 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation and 20 Ω dynamic impedance at 20 mA test current, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N5229B_S00Z datasheet, pinout, applications, or equivalent options, this device is selected for stable 4.3 V clamping in power supply feedback paths, sensor biasing networks, and overvoltage protection where tight tolerance and low leakage (<5 µA at 3.47 V) are required.

Technical Context

This Zener diode operates in reverse breakdown with a nominal zener voltage of 4.3 V at I_Z = 20 mA, exhibiting a temperature coefficient of +0.055 %/°C - indicating positive drift with rising junction temperature. Its 22 Ω zener impedance ensures minimal voltage variation under load changes.

The device uses a hermetically sealed DO-35 glass package with axial leads, cathode identified by a color band, and supports operation across -65 °C to +200 °C junction temperature range. Forward voltage is specified as ≤1.2 V at 200 mA, confirming standard silicon PN junction behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.3 V ±5% at I_Z = 20 mA - defines precise clamping threshold for regulation and reference
Zener Impedance (Z_Z)	22 Ω at I_Z = 20 mA - determines output voltage stability under varying load current
Power Dissipation (P_D)	500 mW at T_A = 25 °C - sets maximum continuous thermal limit in free-air conditions
Reverse Leakage (I_R)	5.0 µA max at V_R = 3.47 V - ensures low quiescent current in standby or high-impedance bias networks
Temperature Coefficient (TC)	+0.055 %/°C - quantifies voltage drift magnitude per degree Celsius rise in junction temperature
Package	DO-35 glass axial - provides hermetic sealing, standard through-hole mounting, and industry-recognized footprint

Pinout & Package

DO-35 glass axial package with two terminals: anode and cathode. Cathode is marked by a visible color band on the glass body. No internal die bonding variations; terminal polarity is fixed and unidirectional.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reverse breakdown reference node	Connected to lower-potential side in Zener regulator configuration; carries forward current up to 200 mA
Cathode	Zener breakdown terminal / Voltage reference output	Marked with color band; connected to regulated output node; sinks reverse current during clamping

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables use in applications requiring tighter regulation than general-purpose Zeners (e.g., 10% parts), reducing need for trimming
Low 22 Ω dynamic impedance	Maintains <100 mV output deviation across ±5 mA load change at 20 mA bias, improving regulation accuracy
Hermetic DO-35 glass package	Guarantees long-term parameter stability and moisture resistance without conformal coating in industrial environments
+0.055 %/°C tempco	Supports predictable voltage drift in temperature-varying circuits - e.g., compensates for op-amp offset drift in precision references

Applications

Power Supply Feedback Reference	Sensor Biasing Network
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback loops via TL431-like discrete implementation. IC Role / Device Role / Timing Role: Zener reference element providing fixed 4.3 V threshold to comparator or error amplifier input. Use Value: Enables accurate ±1% output regulation using passive resistor dividers without trimming, leveraging tight 4.3 V ±5% tolerance and low 22 Ω impedance.	Use Scenario: Supplying stable excitation voltage to resistive sensors (e.g., RTDs, strain gauges) in measurement front-ends. IC Role / Device Role / Timing Role: Low-drift voltage reference source for ratiometric or absolute biasing of bridge-based transducers. Use Value: Delivers <5 µA leakage at 3.47 V, minimizing error contribution in high-impedance sensor interfaces where bias current directly impacts accuracy.
Overvoltage Clamp Protection	Microcontroller I/O Level Shifting
Use Scenario: Protecting sensitive inputs (e.g., ADC pins, logic gates) from transient overvoltage events exceeding 4.3 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts excess energy to ground when input exceeds 4.3 V. Use Value: Limits peak voltage to 4.3 V + I_CLAMP × 22 Ω, offering predictable clamping behavior without active circuitry or response delay.	Use Scenario: Translating 5 V logic signals to 3.3 V microcontroller I/O pins in legacy interface designs. IC Role / Device Role / Timing Role: Passive level translator using forward-biased anode and Zener-clamped cathode to define upper rail. Use Value: Provides reliable 3.3 V–4.3 V clamping window with ≤1.2 V forward drop, enabling safe bidirectional signal translation without external drivers.

Power Supply Feedback Reference

Sensor Biasing Network

Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback loops via TL431-like discrete implementation.

IC Role / Device Role / Timing Role: Zener reference element providing fixed 4.3 V threshold to comparator or error amplifier input.

Use Value: Enables accurate ±1% output regulation using passive resistor dividers without trimming, leveraging tight 4.3 V ±5% tolerance and low 22 Ω impedance.

Use Scenario: Supplying stable excitation voltage to resistive sensors (e.g., RTDs, strain gauges) in measurement front-ends.

IC Role / Device Role / Timing Role: Low-drift voltage reference source for ratiometric or absolute biasing of bridge-based transducers.

Use Value: Delivers <5 µA leakage at 3.47 V, minimizing error contribution in high-impedance sensor interfaces where bias current directly impacts accuracy.

Overvoltage Clamp Protection

Microcontroller I/O Level Shifting

Use Scenario: Protecting sensitive inputs (e.g., ADC pins, logic gates) from transient overvoltage events exceeding 4.3 V.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts excess energy to ground when input exceeds 4.3 V.

Use Value: Limits peak voltage to 4.3 V + I_CLAMP × 22 Ω, offering predictable clamping behavior without active circuitry or response delay.

Use Scenario: Translating 5 V logic signals to 3.3 V microcontroller I/O pins in legacy interface designs.

IC Role / Device Role / Timing Role: Passive level translator using forward-biased anode and Zener-clamped cathode to define upper rail.

Use Value: Provides reliable 3.3 V–4.3 V clamping window with ≤1.2 V forward drop, enabling safe bidirectional signal translation without external drivers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4733A	5.1 V nominal, 5% tolerance, 17 Ω Z_Z, 1 W rating in DO-41 package	Higher power and voltage; requires PCB layout change due to larger DO-41 footprint and different lead spacing	Select when higher power handling (>500 mW) or 5.1 V reference is needed; not drop-in compatible
BZX55C4V3	4.3 V ±5%, 500 mW, 25 Ω Z_Z, DO-35 package, but manufactured by Vishay with different tempco (+0.06 %/°C)	Same form factor and voltage grade; minor tempco variance affects high-temp precision applications	Valid alternative for DO-35 space-constrained designs where ±0.005 %/°C tempco difference is acceptable

Compared with 1N4733A and BZX55C4V3, the 1N5229B_S00Z offers optimal balance of 4.3 V precision, DO-35 compatibility, and +0.055 %/°C tempco for compact, low-power reference designs - whereas 1N4733A suits higher-power needs and BZX55C4V3 serves as a direct-form-factor substitute with negligible performance trade-off.

Availability

1N5229B_S00Z is available at Aetrix Electronics and suitable for power supply feedback reference, sensor biasing network, and overvoltage clamp protection requiring stable component supply across industrial, instrumentation, and embedded control programs.

Supply support for 1N5229B_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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The 1N52xxB series belongs to ON Semiconductor's legacy Zener diode product line designed for general-purpose voltage regulation and reference in cost-sensitive, space-constrained, low-to-medium power circuits.

FAQ

What is the exact Zener voltage tolerance for 1N5229B_S00Z?

The 1N5229B_S00Z has a Zener voltage tolerance of ±5% around its nominal 4.3 V rating, meaning the actual measured V_Z falls between 4.085 V and 4.515 V when tested at I_Z = 20 mA and T_A = 25 °C. This tolerance is guaranteed per ON Semiconductor's 1N5221B–1N5263B datasheet Rev. 3, December 2018.

Does 1N5229B_S00Z have a specified forward voltage?

Yes, the 1N5229B_S00Z specifies a maximum forward voltage of 1.2 V at I_F = 200 mA, consistent with standard silicon PN junction behavior. This value is documented in the "Electrical Characteristics" table of the official ON Semiconductor datasheet and confirms usability in forward-conducting roles such as level shifting or polarity protection.

What is the maximum operating junction temperature for 1N5229B_S00Z?

The 1N5229B_S00Z supports an operating junction temperature range of -65 °C to +200 °C, as defined in the Absolute Maximum Ratings table. This wide range enables deployment in harsh environments including automotive under-hood, industrial motor controls, and aerospace subsystems where thermal extremes are expected.

Is the DO-35 package of 1N5229B_S00Z hermetically sealed?

Yes, the 1N5229B_S00Z uses a hermetically sealed DO-35 glass package, explicitly stated in the package description section of the ON Semiconductor datasheet. This construction prevents moisture ingress and ensures long-term parameter stability, especially critical in high-reliability analog reference and sensor conditioning applications.

What is the reverse leakage current specification for 1N5229B_S00Z?

The reverse leakage current (I_R) for 1N5229B_S00Z is specified as 5.0 µA maximum at V_R = 3.47 V (80% of nominal V_Z). This low leakage supports high-impedance bias networks and minimizes error in precision reference circuits where leakage-induced voltage drop must be kept below 100 µV.

1N5229B_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):: 4.3 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 22 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 1 V

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

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N5229B_S00Z FAQ

1.How can I place an order for 1N5229B_S00Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5229B_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 1N5229B_S00Z reliable?

The price and inventory of 1N5229B_S00Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5229B_S00Z is usually 5 days.

3.What payment methods are accepted for 1N5229B_S00Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5229B_S00Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5229B_S00Z?

1N5229B_S00Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5229B_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 1N5229B_S00Z?

For technical support, including 1N5229B_S00Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5229B_S00Z requirements.

6.How does Aetrix verify that 1N5229B_S00Z is sourced from the original manufacturer or authorized distributors?

All 1N5229B_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 1N5229B_S00Z meets industry standards.

7.What is the process for return or replacement of 1N5229B_S00Z?

All 1N5229B_S00Z units undergo pre-shipment inspection (PSI). If there is an issue with 1N5229B_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 1N5229B_S00Z part is unused and in its original packaging.

Return procedure for 1N5229B_S00Z:

1.Submit a request within 90 days.

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

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