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

onsemi SZBZX84C5V1ET1G

Name: SZBZX84C5V1ET1G
Brand: onsemi
SKU: SZBZX84C5V1ET1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZBZX84C5V1ET1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: SZBZX84C5V1ET1G.pdf

Description:: DIODE ZENER 5.1V 225MW SOT23-3

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Product details

Overview

SZBZX84C5V1ET1G from onsemi is a 5.1 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers ±3% nominal Zener voltage tolerance at 5 mA test current, 60 Ω dynamic impedance, and −2.7 mV/°C temperature coefficient - enabling stable reference performance in portable power rails and low-voltage logic interfaces.

For engineers reviewing the SZBZX84C5V1ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 5.1 V regulation accuracy, 225 W peak pulse power capability, AEC-Q101 qualification for automotive use, and Pb-free RoHS-compliant SOT-23 footprint with cathode band marking.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage across load circuits. Its Zener mechanism provides stable regulation at 5.1 V (min 4.8 V, max 5.4 V) under 5 mA test current, with low 60 Ω dynamic impedance ensuring minimal voltage deviation under load transients.

Thermal design is supported by 500 °C/W junction-to-ambient thermal resistance on FR-5 board and −65 °C to +150 °C operating junction range. The SOT-23 package features void-free thermosetting plastic construction, UL 94 V-0 flammability rating, and 260 °C soldering tolerance for reflow compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage	4.8–5.4 V @ 5 mA - ensures tight 5.1 V regulation for 5 V rail clamping and reference generation
Power Dissipation	250 mW on FR-5 board - supports continuous operation in compact PCB layouts without heatsinking
Zener Impedance	60 Ω @ 5 mA - maintains voltage stability under varying load currents in feedback and sensing circuits
Temp Coefficient	−2.7 mV/°C @ 5 mA - enables predictable drift compensation in temperature-sensitive analog references
ESD Rating	Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and system integration
Peak Pulse Power	225 W @ 8 × 20 µs - absorbs transient surges in I/O protection and power supply input stages
Reverse Leakage	2.0 µA @ 2.0 V - minimizes quiescent current loss in battery-powered voltage monitor circuits
Capacitance	225 pF @ 0 V, 1 MHz - defines high-frequency filtering bandwidth in EMI suppression applications

Pinout & Package

SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish and cathode polarity band.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Forward conduction terminal	Connected to lower-potential node in reverse-biased Zener configuration; carries forward current up to 200 mA
2 (No Connection)	Internal isolation	Electrically unconnected; no PCB trace or pad required - simplifies layout and avoids floating node risks
3 (Cathode)	Reverse breakdown terminal	Connected to regulated output node; marked by polarity band; sinks Zener current during voltage clamping

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics including infotainment power supplies and sensor interface protection
Pb-free & RoHS compliant	Meets global environmental regulations for consumer, industrial, and medical end equipment
Optimized for automated assembly	SOT-23 footprint and marking support high-speed pick-and-place and AOI inspection
High-density packaging	Small 2.9 × 1.3 mm outline enables placement in tight spaces such as smartphone PMIC modules
UL 94 V-0 rated	Self-extinguishing plastic housing meets fire safety requirements for enclosed electronic enclosures

Applications

USB Port Protection	Microcontroller Reset Circuit
Use Scenario: Clamping transient voltages on USB 2.0 data lines and VBUS during hot-plug events. IC Role / Device Role / Timing Role: Zener diode acting as bidirectional overvoltage clamp between signal line and ground. Use Value: 225 W peak pulse power handles ESD strikes per IEC 61000-4-2 while 225 pF capacitance preserves signal integrity up to 10 MHz.	Use Scenario: Providing clean, temperature-stable reset threshold for ARM Cortex-M0+ microcontrollers. IC Role / Device Role / Timing Role: Precision voltage reference generating 5.1 V trigger point for external reset ICs or brown-out detection. Use Value: −2.7 mV/°C tempco and 60 Ω impedance ensure reset threshold drift remains within ±20 mV over −40 °C to +85 °C.
Automotive Sensor Interface	Portable Device Battery Monitor
Use Scenario: Protecting LIN bus transceivers from load dump spikes in 12 V vehicle networks. IC Role / Device Role / Timing Role: Reverse-biased Zener shunting excess voltage to ground during 40 V transients. Use Value: AEC-Q101 qualification and 150 °C max junction temperature support under-hood deployment near engine control units.	Use Scenario: Stabilizing ADC reference input for lithium-ion battery voltage measurement in wearables. IC Role / Device Role / Timing Role: Low-leakage (2.0 µA @ 2 V) Zener providing regulated 5.1 V reference to SAR ADC driver stage. Use Value: 2.0 µA leakage prevents measurable battery drain over multi-week standby, extending runtime in coin-cell devices.

USB Port Protection

Microcontroller Reset Circuit

Use Scenario: Clamping transient voltages on USB 2.0 data lines and VBUS during hot-plug events.

IC Role / Device Role / Timing Role: Zener diode acting as bidirectional overvoltage clamp between signal line and ground.

Use Value: 225 W peak pulse power handles ESD strikes per IEC 61000-4-2 while 225 pF capacitance preserves signal integrity up to 10 MHz.

Use Scenario: Providing clean, temperature-stable reset threshold for ARM Cortex-M0+ microcontrollers.

IC Role / Device Role / Timing Role: Precision voltage reference generating 5.1 V trigger point for external reset ICs or brown-out detection.

Use Value: −2.7 mV/°C tempco and 60 Ω impedance ensure reset threshold drift remains within ±20 mV over −40 °C to +85 °C.

Automotive Sensor Interface

Portable Device Battery Monitor

Use Scenario: Protecting LIN bus transceivers from load dump spikes in 12 V vehicle networks.

IC Role / Device Role / Timing Role: Reverse-biased Zener shunting excess voltage to ground during 40 V transients.

Use Value: AEC-Q101 qualification and 150 °C max junction temperature support under-hood deployment near engine control units.

Use Scenario: Stabilizing ADC reference input for lithium-ion battery voltage measurement in wearables.

IC Role / Device Role / Timing Role: Low-leakage (2.0 µA @ 2 V) Zener providing regulated 5.1 V reference to SAR ADC driver stage.

Use Value: 2.0 µA leakage prevents measurable battery drain over multi-week standby, extending runtime in coin-cell devices.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C5V1ET1G	No AEC-Q101 qualification; standard commercial grade only	Not suitable for automotive systems requiring PPAP documentation or extended temperature validation	Select when cost sensitivity outweighs automotive compliance needs in consumer-grade power management
MMSZ5231BT1G	Same 5.1 V rating but higher 100 Ω Zener impedance and 1.0 µA leakage @ 2 V	Lower precision regulation and reduced noise immunity in analog reference paths	Prefer where tighter impedance or lower leakage is not critical, e.g., basic overvoltage flagging

Compared with BZX84C5V1ET1G and MMSZ5231BT1G, SZBZX84C5V1ET1G offers automotive-grade reliability, lower dynamic impedance, and superior ESD robustness - making it optimal for safety-critical or high-reliability 5 V regulation where long-term stability and surge immunity are mandatory.

Availability

SZBZX84C5V1ET1G is available at Aetrix Electronics and suitable for automotive electronics, portable power management, and industrial sensor interface designs requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for SZBZX84C5V1ET1G 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

onsemi is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The SZBZX84CxxxET1G series targets high-reliability voltage regulation in space-constrained environments, with design emphasis on AEC-Q101 compliance, low-profile SOT-23 packaging, and robust transient suppression for next-generation portable and automotive electronics.

FAQ

What is the Zener voltage tolerance of SZBZX84C5V1ET1G at 5 mA test current?

The SZBZX84C5V1ET1G has a Zener voltage range of 4.8 V to 5.4 V at 5 mA test current, corresponding to ±3% tolerance around the nominal 5.1 V rating. This specification is verified per onsemi's Electrical Characteristics table and applies under TA = 25 °C conditions. The SZBZX84C5V1ET1G maintains this tolerance across its qualified operating temperature range when used within derated power limits.

Is SZBZX84C5V1ET1G suitable for automotive applications?

Yes, SZBZX84C5V1ET1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including infotainment power rails, sensor interface protection, and body control module voltage clamping. Its −65 °C to +150 °C junction temperature range, 225 W peak pulse power, and certified manufacturing controls meet automotive reliability requirements. The SZBZX84C5V1ET1G is explicitly designated for automotive use via the "SZ" prefix per onsemi's ordering information.

What is the thermal resistance of SZBZX84C5V1ET1G on FR-5 board?

The thermal resistance (R_JA) of SZBZX84C5V1ET1G is 500 °C/W when mounted on an FR-5 board at TA = 25 °C. This value assumes standard JEDEC-defined copper pad layout and defines the junction-to-ambient temperature rise per milliwatt of dissipated power. Derating begins above 25 °C at 2.0 mW/°C, limiting maximum power to zero at 150 °C ambient. This R_JA directly impacts thermal design margin for continuous 250 mW operation of the SZBZX84C5V1ET1G.

Does SZBZX84C5V1ET1G have a connected pin 2?

No, pin 2 of the SZBZX84C5V1ET1G is internally unconnected (NC). Per onsemi's mechanical outline and electrical characteristics table, the SOT-23 package uses Style 8 pinout: pin 1 = anode, pin 2 = no connection, pin 3 = cathode. This NC pin simplifies PCB routing and eliminates risk of unintended shorts; no trace or pad is required for pin 2 in layout design of the SZBZX84C5V1ET1G.

What is the maximum reverse leakage current for SZBZX84C5V1ET1G at 2.0 V?

The maximum reverse leakage current (I_R) for SZBZX84C5V1ET1G is 2.0 µA at VR = 2.0 V and TA = 25 °C, as specified in the Electrical Characteristics table. This low leakage supports energy-efficient operation in battery-powered systems, minimizing standby current draw. The SZBZX84C5V1ET1G maintains this leakage performance across its storage temperature range and contributes to stable biasing in high-impedance reference circuits.

SZBZX84C5V1ET1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±6%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 60 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 2 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

SZBZX84C5V1ET1G FAQ

1.How can I place an order for SZBZX84C5V1ET1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZBZX84C5V1ET1G 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 SZBZX84C5V1ET1G reliable?

The price and inventory of SZBZX84C5V1ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C5V1ET1G is usually 5 days.

3.What payment methods are accepted for SZBZX84C5V1ET1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C5V1ET1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZBZX84C5V1ET1G?

SZBZX84C5V1ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZBZX84C5V1ET1G 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 SZBZX84C5V1ET1G?

For technical support, including SZBZX84C5V1ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C5V1ET1G requirements.

6.How does Aetrix verify that SZBZX84C5V1ET1G is sourced from the original manufacturer or authorized distributors?

All SZBZX84C5V1ET1G 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 SZBZX84C5V1ET1G meets industry standards.

7.What is the process for return or replacement of SZBZX84C5V1ET1G?

All SZBZX84C5V1ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C5V1ET1G, 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 SZBZX84C5V1ET1G part is unused and in its original packaging.

Return procedure for SZBZX84C5V1ET1G:

1.Submit a request within 90 days.

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

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