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

onsemi SZ1SMA5929BT3G

Name: SZ1SMA5929BT3G
Brand: onsemi
SKU: SZ1SMA5929BT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZ1SMA5929BT3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: SZ1SMA5929BT3G.pdf

Description:: DIODE ZENER 15V 1.5W SMA

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Inventory:20,919

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Product details

Overview

SZ1SMA5929BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal reverse breakdown voltage of 15 V, ±5% tolerance, 25 Ω maximum Zener impedance at 9 mA test current, and AEC-Q101 qualification for automotive applications. It regulates voltage in power supply rails, overvoltage protection circuits, and reference voltage generation in industrial control modules.

For engineers reviewing the SZ1SMA5929BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating above 75°C, low-profile SMA package compatibility with automated placement, and ESD robustness (>16 kV HBM).

Technical Context

This device operates as a precision voltage reference by maintaining stable reverse conduction at its specified Zener voltage (14.25–15.75 V) under controlled DC current (IZT = 9 mA). Its thermal resistance junction-to-lead is 50°C/W, enabling reliable 1.5 W dissipation at TL = 75°C with defined derating above that temperature.

The SZ1SMA5929BT3G features flat handling surfaces for accurate pick-and-place, Pb-free construction per RoHS, and UL 94 V-0 flammability rating. Polarity is marked via cathode band, and it supports top-slide or bottom-board mounting configurations in high-volume SMT assembly.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	14.25–15.75 V @ I_ZT = 9 mA - defines regulated output voltage range under nominal bias
Power Dissipation (P_D)	1.5 W @ T_L = 75°C - maximum steady-state power handling with lead temperature control
Zener Impedance (Z_ZT)	25 Ω max @ I_ZT = 9 mA - indicates regulation stability under dynamic load changes
Reverse Leakage (I_R)	0.25 μA max @ V_R = 12.2 V - ensures minimal standby current in undervoltage conditions
ESD Rating	Class 3 (>16 kV) HBM - enables robust handling in uncontrolled manufacturing environments
Operating Temp	−65°C to +150°C - supports deployment in under-hood automotive and industrial ambient extremes
AEC-Q101 Qualified	Yes - validates reliability for automotive electronics per stress-test requirements

Pinout & Package

Package: SMA (Case 403D), surface-mount, low-profile plastic package with void-free transfer molding, corrosion-resistant solderable leads, and UL 94 V-0 flammability rating. Cathode identified by molded polarity notch or band.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Band-marked end)	Reverse-biased Zener terminal	Connected to higher-potential rail; conducts when reverse voltage exceeds V_Z
Anode	Reference/ground terminal	Typically tied to system ground or common return path for regulation reference

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing
ESD robustness >16 kV HBM	Reduces risk of field failure during board handling and assembly without additional protection circuitry
Flat handling surface	Enables consistent vacuum nozzle pickup and precise placement in high-speed SMT lines
Pb-free and RoHS compliant	Meets global environmental compliance mandates without requiring process requalification
Low-profile SMA package	Offers footprint and height compatibility with legacy MELF designs while enabling automated assembly

Applications

Automotive Power Rail Clamping	Industrial Sensor Reference Supply
Use Scenario: Protecting 12 V CAN bus transceivers from load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Zener clamping element shunting excess energy to ground during voltage surges. Use Value: Maintains clamp voltage at ≤15.75 V to prevent damage to downstream 16 V-rated ICs without sacrificing response speed.	Use Scenario: Providing stable 15 V reference for analog front-end amplifiers in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and signal conditioning. Use Value: Delivers <±5% tolerance and 25 Ω Z_ZT to ensure measurement repeatability across −40°C to +125°C operating range.
Consumer PSU Overvoltage Protection	Medical Device Power Monitoring
Use Scenario: Secondary-side OVLO circuit in AC/DC adapters for smart home hubs. IC Role / Device Role / Timing Role: Threshold detector triggering shutdown when output exceeds safe limit. Use Value: Enables fast, deterministic trip at 15.75 V with sub-μA leakage below threshold to minimize standby loss.	Use Scenario: Isolated auxiliary supply monitoring in portable ultrasound battery packs. IC Role / Device Role / Timing Role: Fault-detection reference in redundant voltage supervision chains. Use Value: Supports AEC-Q101-relevant reliability and −65°C to +150°C operation required for medical-grade thermal cycling validation.

Automotive Power Rail Clamping

Industrial Sensor Reference Supply

Use Scenario: Protecting 12 V CAN bus transceivers from load-dump transients in vehicle ECUs.

IC Role / Device Role / Timing Role: Zener clamping element shunting excess energy to ground during voltage surges.

Use Value: Maintains clamp voltage at ≤15.75 V to prevent damage to downstream 16 V-rated ICs without sacrificing response speed.

Use Scenario: Providing stable 15 V reference for analog front-end amplifiers in factory-floor pressure sensors.

IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and signal conditioning.

Use Value: Delivers <±5% tolerance and 25 Ω Z_ZT to ensure measurement repeatability across −40°C to +125°C operating range.

Consumer PSU Overvoltage Protection

Medical Device Power Monitoring

Use Scenario: Secondary-side OVLO circuit in AC/DC adapters for smart home hubs.

IC Role / Device Role / Timing Role: Threshold detector triggering shutdown when output exceeds safe limit.

Use Value: Enables fast, deterministic trip at 15.75 V with sub-μA leakage below threshold to minimize standby loss.

Use Scenario: Isolated auxiliary supply monitoring in portable ultrasound battery packs.

IC Role / Device Role / Timing Role: Fault-detection reference in redundant voltage supervision chains.

Use Value: Supports AEC-Q101-relevant reliability and −65°C to +150°C operation required for medical-grade thermal cycling validation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1SMA5929BT3G	No AEC-Q101 qualification; identical electrical specs and package	Not approved for automotive production; suitable for commercial/industrial use only	Select when automotive qualification is not required and cost sensitivity is higher
MMSZ5245B-TP	500 mW rating, 15 V nominal, SOD-123 package, no AEC-Q101	Lower power handling limits use in high-current regulation; smaller footprint but less thermal margin	Choose for space-constrained consumer designs where 1.5 W dissipation is unnecessary

Compared with SZ1SMA5929BT3G, the 1SMA5929BT3G offers identical Zener performance but lacks automotive qualification, while MMSZ5245B-TP trades power capability and thermal robustness for compact size-making SZ1SMA5929BT3G the sole choice for AEC-Q101-compliant 15 V regulation at 1.5 W.

Availability

SZ1SMA5929BT3G is available at Aetrix Electronics and suitable for automotive ECU power management, industrial sensor reference supplies, and medical device voltage supervision requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SZ1SMA5929BT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The SZ1SMA59xxBT3G series was designed specifically for AEC-Q101-compliant voltage regulation in harsh-environment automotive systems, delivering robust Zener performance in surface-mount form.

FAQ

What is the Zener voltage tolerance for SZ1SMA5929BT3G?

The SZ1SMA5929BT3G has a ±5% Zener voltage tolerance, meaning its reverse breakdown voltage is guaranteed between 14.25 V and 15.75 V at I_ZT = 9 mA and thermal equilibrium. This tolerance is explicitly stated in the datasheet's Electrical Characteristics table and applies to all devices in the SZ1SMA59xxBT3G family. The SZ1SMA5929BT3G maintains this specification across its full operating temperature range.

Is SZ1SMA5929BT3G suitable for automotive applications?

Yes, SZ1SMA5929BT3G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control units, body electronics, and infotainment power supplies. Its qualification covers stress tests including temperature cycling, high-temperature reverse bias, and mechanical shock. The "SZ" prefix denotes automotive-specific site and change control requirements, distinguishing it from the commercial-grade 1SMA5929BT3G variant.

What is the maximum power dissipation for SZ1SMA5929BT3G at 100°C lead temperature?

At 100°C lead temperature (T_L), the SZ1SMA5929BT3G must be derated from its 1.5 W rating at 75°C. With a derating factor of 20 mW/°C above 75°C, the allowable power drops to 1.0 W (1.5 W − (25°C × 20 mW/°C)). This value is derived directly from the Maximum Ratings table in the official onsemi datasheet and reflects real-world thermal design constraints for PCB layout with copper pad heatsinking.

Does SZ1SMA5929BT3G have a specified forward voltage?

Yes, the SZ1SMA5929BT3G has a maximum forward voltage (V_F) of 1.2 V at I_F = 200 mA, as specified in the Electrical Characteristics table. This parameter is consistent across the entire 1SMA59xxBT3G/SZ1SMA59xxBT3G series and confirms diode functionality in forward conduction mode, useful for polarity protection or dual-role circuit designs involving the SZ1SMA5929BT3G.

What packaging format is used for SZ1SMA5929BT3G?

SZ1SMA5929BT3G is supplied in tape-and-reel packaging, 5,000 units per reel, using the Pb-free SMA (Case 403D) package. The marking code "829B" appears on the device body, and the "G" suffix confirms RoHS compliance. This packaging supports high-speed automated placement and is documented in the Ordering Information section of the onsemi datasheet for SZ1SMA5929BT3G.

SZ1SMA5929BT3G 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):: 15 V

Tolerance:: ±5%

Power - Max:: 1.5 W

Impedance (Max) (Zzt):: 9 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 11.4 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

SZ1SMA5929BT3G FAQ

1.How can I place an order for SZ1SMA5929BT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZ1SMA5929BT3G 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 SZ1SMA5929BT3G reliable?

The price and inventory of SZ1SMA5929BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5929BT3G is usually 5 days.

3.What payment methods are accepted for SZ1SMA5929BT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5929BT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZ1SMA5929BT3G?

SZ1SMA5929BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZ1SMA5929BT3G 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 SZ1SMA5929BT3G?

For technical support, including SZ1SMA5929BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5929BT3G requirements.

6.How does Aetrix verify that SZ1SMA5929BT3G is sourced from the original manufacturer or authorized distributors?

All SZ1SMA5929BT3G 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 SZ1SMA5929BT3G meets industry standards.

7.What is the process for return or replacement of SZ1SMA5929BT3G?

All SZ1SMA5929BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5929BT3G, 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 SZ1SMA5929BT3G part is unused and in its original packaging.

Return procedure for SZ1SMA5929BT3G:

1.Submit a request within 90 days.

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

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