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

onsemi SZ1SMA5916BT3G

Name: SZ1SMA5916BT3G
Brand: onsemi
SKU: SZ1SMA5916BT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZ1SMA5916BT3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: SZ1SMA5916BT3G.pdf

Description:: DIODE ZENER 4.3V 1.5W SMA

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Product details

Overview

SZ1SMA5916BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal reverse breakdown voltage of 4.3 V, maximum Zener impedance of 87.2 Ω at 6.0 mA test current, and leakage current ≤2.5 μA at 1.0 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog and automotive power-supply monitoring circuits.

For engineers reviewing the SZ1SMA5916BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, ±5% voltage tolerance, 260°C soldering capability, and SMA package compatibility with automated placement systems.

Technical Context

This device operates as a two-terminal voltage-regulating diode relying on controlled avalanche or Zener breakdown. Its thermal resistance junction-to-lead is 50°C/W, enabling stable regulation under DC bias up to 349 mA maximum Zener current at 25°C ambient.

The SZ1SMA5916BT3G exhibits a negative temperature coefficient below ~5 V, with typical V_Z drift of −2.5 mV/°C near 4.3 V, requiring thermal-aware layout in precision references. It supports top-slide or bottom-board mounting due to flat handling surface and void-free molded plastic case.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.08–4.52 V @ I_ZT = 6.0 mA - defines regulated output range for voltage reference design
Max Power Dissipation	1.5 W @ T_L = 75°C - sets thermal derating limit for PCB copper pad design
Zener Impedance (Z_ZT)	87.2 Ω max @ I_ZT = 6.0 mA - determines regulation stiffness under load transients
Leakage Current (I_R)	≤2.5 μA @ V_R = 1.0 V - ensures minimal error current in high-impedance bias networks
Thermal Resistance (R_JL)	50 °C/W - enables thermal modeling from lead temperature to junction
ESD Rating	Class 3 (>16 kV HBM) - qualifies for handling in uncontrolled ESD environments
Operating Temp Range	−65°C to +150°C - supports under-hood automotive and industrial ambient conditions

Pinout & Package

SMA package (Case 403D), surface-mount, low-profile plastic case with cathode band marking. Void-free transfer-molded construction, Pb-free, UL 94 V-0 rated.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (marked band)	High-side terminal during reverse bias	Connected to regulated voltage node; polarity must match schematic symbol orientation
Anode	Low-side terminal during reverse bias	Typically tied to ground or common return; forms current path through external series resistor

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control modules and body electronics
Flat handling surface	Enables accurate pick-and-place placement without tombstoning on fine-pitch pads
Pb-free, RoHS-compliant	Meets global environmental compliance requirements without lead-based solder compatibility issues
Top-slide or bottom-mount compatible	Supports dual-side assembly and compact board stacking in space-constrained modules
260°C soldering rating	Withstands standard reflow profiles including lead-free SAC305 without delamination

Applications

Automotive Engine Control Unit (ECU) Reference	Industrial Sensor Signal Conditioning
Use Scenario: Providing stable 4.3 V reference for analog-to-digital converter (ADC) input scaling in engine knock sensor interface circuitry. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise bias point for op-amp gain stages and ADC reference divider network. Use Value: Maintains <±1% reference accuracy across −40°C to +125°C ambient due to tight ±5% V_Z tolerance and low dynamic impedance.	Use Scenario: Clamping transient overvoltage on 5 V supply rail feeding MEMS pressure sensor front-end amplifier. IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy before it reaches sensitive analog signal chain components. Use Value: Limits rail excursion to ≤4.52 V with <2.5 μA leakage at 1 V, preserving sensor quiescent current budget.
Consumer Power Adapter Feedback Loop	Medical Diagnostic Equipment Bias Network
Use Scenario: Setting feedback threshold in secondary-side TL431-based isolated flyback controller for USB-C PD adapter. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing optocoupler LED current to regulate primary-side PWM duty cycle. Use Value: Enables ±5% output voltage regulation over line/load/temperature with 87.2 Ω Z_ZT minimizing loop gain variation.	Use Scenario: Generating stable bias voltage for low-noise instrumentation amplifier in portable ECG front-end. IC Role / Device Role / Timing Role: Low-leakage voltage reference source for ultra-high-impedance electrode biasing network. Use Value: Delivers <2.5 μA leakage at 1 V reverse bias, preventing input offset drift in pA-level current-sensing paths.

Automotive Engine Control Unit (ECU) Reference

Industrial Sensor Signal Conditioning

Use Scenario: Providing stable 4.3 V reference for analog-to-digital converter (ADC) input scaling in engine knock sensor interface circuitry.

IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise bias point for op-amp gain stages and ADC reference divider network.

Use Value: Maintains <±1% reference accuracy across −40°C to +125°C ambient due to tight ±5% V_Z tolerance and low dynamic impedance.

Use Scenario: Clamping transient overvoltage on 5 V supply rail feeding MEMS pressure sensor front-end amplifier.

IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy before it reaches sensitive analog signal chain components.

Use Value: Limits rail excursion to ≤4.52 V with <2.5 μA leakage at 1 V, preserving sensor quiescent current budget.

Consumer Power Adapter Feedback Loop

Medical Diagnostic Equipment Bias Network

Use Scenario: Setting feedback threshold in secondary-side TL431-based isolated flyback controller for USB-C PD adapter.

IC Role / Device Role / Timing Role: Precision voltage reference stabilizing optocoupler LED current to regulate primary-side PWM duty cycle.

Use Value: Enables ±5% output voltage regulation over line/load/temperature with 87.2 Ω Z_ZT minimizing loop gain variation.

Use Scenario: Generating stable bias voltage for low-noise instrumentation amplifier in portable ECG front-end.

IC Role / Device Role / Timing Role: Low-leakage voltage reference source for ultra-high-impedance electrode biasing network.

Use Value: Delivers <2.5 μA leakage at 1 V reverse bias, preventing input offset drift in pA-level current-sensing paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V3	300 mW SOT-23 package; higher Z_ZT (90 Ω); ±5% tolerance; no AEC-Q101 rating	Not suitable for under-hood automotive use; limited power handling in sustained clamp scenarios	Select when board space is critical and thermal load remains <300 mW
MMSZ4685	500 mW SOD-123 package; V_Z = 4.3 V ±5%; Z_ZT = 90 Ω @ 5 mA; AEC-Q101 qualified	Lower power rating reduces margin in high-current reference or clamp roles	Choose where footprint size and cost outweigh 1.5 W dissipation requirement

Compared with BZX84-C4V3 and MMSZ4685, the SZ1SMA5916BT3G delivers 3× higher power handling and lower dynamic impedance in the same voltage class, making it preferred for robust automotive voltage references and industrial clamping where thermal margin and regulation stability are critical.

Availability

SZ1SMA5916BT3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SZ1SMA5916BT3G 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 1SMA59xxBT3G/SZ1SMA59xxBT3G series was designed specifically for high-reliability voltage regulation and transient suppression in automotive and industrial power systems where AEC-Q101 compliance and thermal robustness are mandatory.

FAQ

What is the nominal Zener voltage of the SZ1SMA5916BT3G?

The SZ1SMA5916BT3G has a nominal Zener voltage of 4.3 V, with guaranteed minimum and maximum values of 4.08 V and 4.52 V respectively at a test current of 6.0 mA. This ±5% tolerance is specified per the device marking and electrical characteristics table in the onsemi datasheet. The SZ1SMA5916BT3G maintains this regulation performance across its full operating temperature range of −65°C to +150°C.

Is the SZ1SMA5916BT3G suitable for automotive applications?

Yes, the SZ1SMA5916BT3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and ADAS subsystems. Its construction features void-free transfer-molded plastic, Pb-free finish, and 260°C soldering capability-key requirements for automotive-grade reliability. The SZ1SMA5916BT3G also meets Class 3 ESD rating (>16 kV HBM), supporting robust handling in manufacturing environments.

What is the maximum DC Zener current rating for the SZ1SMA5916BT3G?

The maximum DC Zener current (I_ZM) for the SZ1SMA5916BT3G is 349 mA at an ambient temperature of 25°C. This value decreases with rising temperature due to thermal derating-specifically, power dissipation is reduced by 20 mW/°C above 75°C. The SZ1SMA5916BT3G's 1.5 W power rating at T_L = 75°C and 50°C/W junction-to-lead thermal resistance enable predictable thermal design in real-world layouts.

How does the SZ1SMA5916BT3G compare to standard MELF Zener diodes?

The SZ1SMA5916BT3G is explicitly designed as an ideal replacement for MELF packages, offering identical electrical performance in a more manufacturable surface-mount SMA package. Unlike fragile glass MELF devices, the SZ1SMA5916BT3G uses void-free plastic molding and a flat handling surface for reliable automated placement. Its 260°C soldering rating and UL 94 V-0 flammability rating further enhance process compatibility compared to traditional MELF Zeners.

What is the Zener impedance of the SZ1SMA5916BT3G at its test current?

The SZ1SMA5916BT3G has a maximum Zener impedance (Z_ZT) of 87.2 Ω at the specified test current of 6.0 mA. This parameter directly impacts regulation accuracy under varying load conditions-lower Z_ZT yields tighter voltage stability. The SZ1SMA5916BT3G's 87.2 Ω value is measured under thermal equilibrium at 25°C and reflects its ability to maintain consistent V_Z during small-signal AC variations superimposed on DC bias.

SZ1SMA5916BT3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: SZ1SMA59xxBT3G

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 4.3 V

Tolerance:: ±5%

Power - Max:: 1.5 W

Impedance (Max) (Zzt):: 6 Ohms

Current - Reverse Leakage @ Vr:: 2.5 µA @ 1 V

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

Operating Temperature:: -65°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SMA

SZ1SMA5916BT3G FAQ

1.How can I place an order for SZ1SMA5916BT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZ1SMA5916BT3G 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 SZ1SMA5916BT3G reliable?

The price and inventory of SZ1SMA5916BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5916BT3G is usually 5 days.

3.What payment methods are accepted for SZ1SMA5916BT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5916BT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZ1SMA5916BT3G?

SZ1SMA5916BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZ1SMA5916BT3G 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 SZ1SMA5916BT3G?

For technical support, including SZ1SMA5916BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5916BT3G requirements.

6.How does Aetrix verify that SZ1SMA5916BT3G is sourced from the original manufacturer or authorized distributors?

All SZ1SMA5916BT3G 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 SZ1SMA5916BT3G meets industry standards.

7.What is the process for return or replacement of SZ1SMA5916BT3G?

All SZ1SMA5916BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5916BT3G, 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 SZ1SMA5916BT3G part is unused and in its original packaging.

Return procedure for SZ1SMA5916BT3G:

1.Submit a request within 90 days.

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

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