Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi SZ1SMA5913BT3G

Name: SZ1SMA5913BT3G
Brand: onsemi
SKU: SZ1SMA5913BT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SZ1SMA5913BT3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: SZ1SMA5913BT3G.pdf

Description:: DIODE ZENER 3.3V 1.5W SMA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:19,231

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SZ1SMA5913BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 3.3 V, ±5% tolerance, 113.6 Ω dynamic impedance at 113.6 mA test current, and AEC-Q101 qualification for automotive applications. It regulates voltage in low-power biasing, reference, and overvoltage protection circuits.

For engineers reviewing the SZ1SMA5913BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating above 75°C, cathode-anode polarity marking, and Pb-free SMA package compatibility with automated SMT assembly.

Technical Context

This device operates as a reverse-biased voltage reference with specified breakdown at IZT = 113.6 mA. Its 3.3 V nominal zener voltage exhibits a negative temperature coefficient below 5 V, and it maintains regulation under DC loads up to 455 mA maximum zener current (IZM).

The SMA package enables top-slide or bottom-board mounting with flat handling surface and UL 94 V-0 flammability rating. Thermal resistance junction-to-lead is 50 °C/W, supporting stable operation at TL = 75°C with 1.5 W dissipation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.3 V nominal (3.13–3.47 V range), ±5% tolerance - ensures precise low-voltage reference in analog sensing and regulator feedback paths.
Power Dissipation (P_D)	1.5 W @ T_L = 75°C - defines maximum continuous power handling with zero-lead-length thermal condition.
Zener Impedance (Z_ZT)	113.6 Ω @ I_ZT = 113.6 mA - indicates voltage regulation stiffness; lower values improve load regulation in precision references.
Max Zener Current (I_ZM)	455 mA - sets absolute DC current limit before thermal runaway; used to size series resistor in shunt regulator designs.
Leakage Current (I_R)	1.0 μA @ V_R = 1.0 V - confirms minimal reverse conduction below breakdown, critical for low-power standby circuits.
ESD Rating	Class 3 (>16 kV HBM) - supports robust handling in automotive manufacturing environments without additional ESD protection.
Operating Temp	−65°C to +150°C - enables deployment in under-hood automotive modules and industrial control enclosures.

Pinout & Package

The SZ1SMA5913BT3G uses the SMA (DO-214AC) package per Case 403D, with molded cathode band marking and two terminals: Pin 1 = Cathode, Pin 2 = Anode. The low-profile, void-free plastic case supports reflow soldering at 260°C for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (marked band)	High-side connection in shunt regulation	Connected to regulated node; reverse-biased voltage develops across cathode–anode during regulation.
Anode	Low-side reference node	Typically tied to ground or common return; completes current path through series resistor into load.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock - required for engine control, body electronics, and ADAS subsystems.
Pb-free construction	RoHS-compliant materials and plating - meets global environmental regulations without compromising solderability or long-term corrosion resistance.
Flat handling surface	Enables accurate pick-and-place placement in high-speed SMT lines - reduces misalignment and tombstoning risk during reflow.
UL 94 V-0 flammability	Self-extinguishing polymer housing - satisfies safety requirements for enclosed power supplies and battery management systems.
Top-slide or bottom-mount design	Flexible board layout integration - accommodates both standard top-side component placement and space-constrained bottom-side routing.

Applications

Automotive Body Control Module	Industrial Sensor Signal Conditioning
Use Scenario: Providing stable 3.3 V reference for microcontroller ADC inputs monitoring door lock status, window position, or ambient light levels. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining constant bias point despite battery voltage fluctuations (9–16 V). Use Value: Enables consistent 12-bit ADC readings across temperature and supply variations due to tight ±5% V_Z tolerance and low 113.6 Ω Z_ZT.	Use Scenario: Biasing op-amp input stages in 4–20 mA loop transmitters for pressure or temperature sensors. IC Role / Device Role / Timing Role: Precision DC reference source for current-loop output stage calibration and zero-point adjustment. Use Value: Delivers <1.0 μA leakage at 1.0 V reverse bias, minimizing error contribution in high-impedance sensor front-ends.
Consumer Power Adapter Feedback	Medical Diagnostic Equipment Reference
Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering USB-C accessories. IC Role / Device Role / Timing Role: Zener clamp regulating optocoupler LED current to maintain tight output voltage regulation. Use Value: Supports 1.5 W continuous dissipation at 75°C lead temperature - sustains reliable feedback under sustained full-load conditions.	Use Scenario: Low-noise voltage reference for analog front-end amplifiers in portable ECG monitors. IC Role / Device Role / Timing Role: Stable 3.3 V node generator isolating sensitive analog circuitry from digital switching noise. Use Value: Class 3 ESD rating (>16 kV HBM) prevents latch-up or parametric shift during clinical handling and ESD-prone hospital environments.

Automotive Body Control Module

Industrial Sensor Signal Conditioning

Use Scenario: Providing stable 3.3 V reference for microcontroller ADC inputs monitoring door lock status, window position, or ambient light levels.

IC Role / Device Role / Timing Role: Shunt voltage reference maintaining constant bias point despite battery voltage fluctuations (9–16 V).

Use Value: Enables consistent 12-bit ADC readings across temperature and supply variations due to tight ±5% V_Z tolerance and low 113.6 Ω Z_ZT.

Use Scenario: Biasing op-amp input stages in 4–20 mA loop transmitters for pressure or temperature sensors.

IC Role / Device Role / Timing Role: Precision DC reference source for current-loop output stage calibration and zero-point adjustment.

Use Value: Delivers <1.0 μA leakage at 1.0 V reverse bias, minimizing error contribution in high-impedance sensor front-ends.

Consumer Power Adapter Feedback

Medical Diagnostic Equipment Reference

Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering USB-C accessories.

IC Role / Device Role / Timing Role: Zener clamp regulating optocoupler LED current to maintain tight output voltage regulation.

Use Value: Supports 1.5 W continuous dissipation at 75°C lead temperature - sustains reliable feedback under sustained full-load conditions.

Use Scenario: Low-noise voltage reference for analog front-end amplifiers in portable ECG monitors.

IC Role / Device Role / Timing Role: Stable 3.3 V node generator isolating sensitive analog circuitry from digital switching noise.

Use Value: Class 3 ESD rating (>16 kV HBM) prevents latch-up or parametric shift during clinical handling and ESD-prone hospital environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C3V3	300 mW rated power, SOT-23 package, 90 Ω Z_ZT @ 5 mA - lower power, higher impedance, smaller footprint.	Targeted at ultra-low-power portable devices where 1.5 W dissipation is unnecessary.	Select BZX84-C3V3 when board space is constrained and max load current remains below 50 mA.
MMSZ5226B	500 mW rated power, SOD-123 package, 15 Ω Z_ZT @ 20 mA - medium power, lower impedance, automotive-grade option.	Used in cost-sensitive industrial controls requiring tighter regulation but less ruggedness than AEC-Q101.	Select MMSZ5226B when needing better regulation stiffness than SZ1SMA5913BT3G at lower current levels (≤20 mA).

Compared with BZX84-C3V3 and MMSZ5226B, the SZ1SMA5913BT3G offers highest power handling (1.5 W), AEC-Q101 qualification, and SMA package robustness - making it optimal for automotive and high-reliability industrial shunt regulation where sustained current exceeds 100 mA.

Availability

SZ1SMA5913BT3G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply, traceable sourcing, and lifecycle continuity.

Supply support for SZ1SMA5913BT3G 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 SZ1SMA59xxBT3G series was designed specifically for AEC-Q101-compliant automotive voltage regulation, offering enhanced reliability, Pb-free packaging, and robust thermal performance in surface-mount Zener applications.

FAQ

What is the nominal zener voltage and tolerance of the SZ1SMA5913BT3G?

The SZ1SMA5913BT3G has a nominal zener voltage of 3.3 V with a guaranteed tolerance of ±5%, corresponding to a minimum of 3.13 V and maximum of 3.47 V at I_ZT = 113.6 mA and thermal equilibrium. This tight tolerance supports precision biasing in automotive and industrial analog circuits where stable reference voltage is critical for ADC accuracy and sensor signal integrity.

Is the SZ1SMA5913BT3G qualified for automotive applications?

Yes, the SZ1SMA5913BT3G carries AEC-Q101 qualification and PPAP capability, confirming its suitability for automotive use cases including body control modules, lighting drivers, and powertrain subsystems. The "SZ" prefix explicitly denotes compliance with automotive-specific site and process controls, and the device undergoes rigorous stress testing per AEC-Q101 standards for temperature cycling, humidity, and mechanical robustness.

What is the maximum DC zener current (I_ZM) for the SZ1SMA5913BT3G?

The maximum DC zener current (I_ZM) for the SZ1SMA5913BT3G is 455 mA, derived from its 1.5 W power rating and 3.3 V nominal zener voltage (I_ZM = P_D/V_Z). This value defines the upper limit of continuous reverse current the device can safely conduct without exceeding thermal limits, and must be respected when calculating series resistor values in shunt regulator designs.

What package type does the SZ1SMA5913BT3G use, and what are its key mechanical features?

The SZ1SMA5913BT3G uses the SMA (DO-214AC) package per Case 403D, featuring a flat handling surface for accurate SMT placement, void-free transfer-molded plastic construction, UL 94 V-0 flammability rating, and cathode identification via molded band. It supports reflow soldering at 260°C for 10 seconds and allows both top-slide and bottom-circuit board mounting configurations.

How does the SZ1SMA5913BT3G compare to standard 3.3 V Zeners like the 1N4728A?

The SZ1SMA5913BT3G differs from the through-hole 1N4728A by using a surface-mount SMA package, offering AEC-Q101 qualification, Pb-free construction, and higher power dissipation (1.5 W vs. 1.0 W). Its 113.6 Ω zener impedance at 113.6 mA provides stiffer regulation than the 1N4728A's typical 15 Ω at 20 mA - though optimized for different operating currents and thermal environments.

SZ1SMA5913BT3G 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):: 3.3 V

Tolerance:: ±5%

Power - Max:: 1.5 W

Impedance (Max) (Zzt):: 10 Ohms

Current - Reverse Leakage @ Vr:: 50 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

SZ1SMA5913BT3G FAQ

1.How can I place an order for SZ1SMA5913BT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZ1SMA5913BT3G 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 SZ1SMA5913BT3G reliable?

The price and inventory of SZ1SMA5913BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5913BT3G is usually 5 days.

3.What payment methods are accepted for SZ1SMA5913BT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5913BT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZ1SMA5913BT3G?

SZ1SMA5913BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZ1SMA5913BT3G 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 SZ1SMA5913BT3G?

For technical support, including SZ1SMA5913BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5913BT3G requirements.

6.How does Aetrix verify that SZ1SMA5913BT3G is sourced from the original manufacturer or authorized distributors?

All SZ1SMA5913BT3G 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 SZ1SMA5913BT3G meets industry standards.

7.What is the process for return or replacement of SZ1SMA5913BT3G?

All SZ1SMA5913BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5913BT3G, 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 SZ1SMA5913BT3G part is unused and in its original packaging.

Return procedure for SZ1SMA5913BT3G:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…