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

onsemi SZMMSZ2V4T1G

Name: SZMMSZ2V4T1G
Brand: onsemi
SKU: SZMMSZ2V4T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMMSZ2V4T1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: SZMMSZ2V4T1G.pdf

Description:: DIODE ZENER 2.4V 500MW SOD123

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Product details

Overview

SZMMSZ2V4T1G from onsemi is a 2.4 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 100 Ω maximum dynamic impedance at 5 mA test current and 50 µA maximum reverse leakage at 1 V. It serves as a precision low-voltage reference or overvoltage clamp in automotive sensor signal conditioning circuits.

For engineers reviewing the SZMMSZ2V4T1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, ESD robustness (Class 3, >16 kV HBM), and direct alternatives for automotive-grade voltage regulation design.

Technical Context

This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias voltage regulation at low nominal voltages. Its 2.4 V nominal Zener voltage exhibits a negative temperature coefficient (~−3 mV/°C), requiring thermal compensation in high-accuracy references.

The SOD−123 package enables automated placement in space-constrained PCBs while maintaining 150 °C/W junction-to-lead thermal resistance. It is Pb−free, AEC−Q101 qualified, and rated for −55°C to +150°C junction temperature operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	2.4 V nominal, ±5% tolerance (2.28–2.52 V @ I_ZT = 5 mA); sets precise clamping threshold in low-voltage rails.
Power Dissipation (P_D)	500 mW on FR−5 board @ T_L = 75°C; derates linearly at 6.7 mW/°C above 75°C - defines safe continuous operating envelope.
Zener Impedance (Z_ZT)	≤100 Ω @ I_ZT = 5 mA; limits output voltage variation under load transients in reference applications.
Reverse Leakage (I_R)	≤50 µA @ V_R = 1 V; ensures minimal quiescent current draw in battery-powered sensing nodes.
ESD Rating	Class 3 (>16 kV) per Human Body Model; supports robustness in automotive module assembly and field operation.
Junction Temp Range	−55°C to +150°C; validated for under-hood and engine-control unit environments per AEC−Q101.

Pinout & Package

SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated output node; reverse-biased during Zener operation; must be held at higher potential than anode.
2 (Non-banded End)	Anode	Connected to ground or lower-potential rail; completes current path during regulation; polarity critical for correct biasing.

Key Features

Feature	Design Value
AEC−Q101 Qualified	Validated for automotive electronics use including engine control, body modules, and ADAS sensors - meets stress-test requirements for temperature cycling, humidity, and mechanical shock.
Pb−Free Construction	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles - supports lead-free manufacturing without solderability compromise.
High ESD Robustness	Class 3 (>16 kV HBM) rating eliminates need for external ESD protection in many interface circuits - reduces BOM count in CAN/LIN node designs.
Thermal Derating Clarity	Defined 6.7 mW/°C derating slope above 75°C ambient - enables accurate thermal margining in sealed enclosures or high-power-density layouts.

Applications

Automotive Engine Control Sensors	Industrial Current Loop Transmitters
Use Scenario: Regulating reference voltage for analog front-end of knock or oxygen sensor signal conditioning in ECU modules. IC Role / Device Role / Timing Role: Zener diode providing stable 2.4 V bias point for op-amp input stage and ADC reference divider network. Use Value: Maintains <±1% reference stability across −40°C to +125°C ambient due to AEC−Q101 validation and tight 5% V_Z tolerance.	Use Scenario: Clamping transient overvoltage on 4–20 mA loop inputs exposed to inductive switching noise in PLC I/O modules. IC Role / Device Role / Timing Role: Low-voltage Zener shunt element absorbing surge energy before it reaches precision current-sense amplifier inputs. Use Value: 500 mW power rating and 100 Ω Z_ZT ensure fast response to 100 ns spikes without latch-up or parameter shift.
Medical Wearable Battery Monitoring	Consumer IoT Power Sequencing
Use Scenario: Providing low-current voltage reference for fuel gauge IC in rechargeable Li-ion battery packs used in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision 2.4 V Zener supplying stable bias to coulomb counter analog circuitry during deep-sleep mode. Use Value: 50 µA max leakage at 1 V ensures sub-µA standby current contribution - extends battery life beyond 3 years in clinical wearables.	Use Scenario: Enabling controlled power-up sequencing of 3.3 V and 1.8 V rails via Zener-triggered enable logic in smart home hubs. IC Role / Device Role / Timing Role: Threshold detector that asserts reset or enable signal when main supply crosses 2.4 V during cold start. Use Value: Tight ±5% V_Z tolerance and −3 mV/°C TC allow predictable turn-on timing across commercial temperature range without calibration.

Automotive Engine Control Sensors

Industrial Current Loop Transmitters

Use Scenario: Regulating reference voltage for analog front-end of knock or oxygen sensor signal conditioning in ECU modules.

IC Role / Device Role / Timing Role: Zener diode providing stable 2.4 V bias point for op-amp input stage and ADC reference divider network.

Use Value: Maintains <±1% reference stability across −40°C to +125°C ambient due to AEC−Q101 validation and tight 5% V_Z tolerance.

Use Scenario: Clamping transient overvoltage on 4–20 mA loop inputs exposed to inductive switching noise in PLC I/O modules.

IC Role / Device Role / Timing Role: Low-voltage Zener shunt element absorbing surge energy before it reaches precision current-sense amplifier inputs.

Use Value: 500 mW power rating and 100 Ω Z_ZT ensure fast response to 100 ns spikes without latch-up or parameter shift.

Medical Wearable Battery Monitoring

Consumer IoT Power Sequencing

Use Scenario: Providing low-current voltage reference for fuel gauge IC in rechargeable Li-ion battery packs used in portable diagnostic devices.

IC Role / Device Role / Timing Role: Precision 2.4 V Zener supplying stable bias to coulomb counter analog circuitry during deep-sleep mode.

Use Value: 50 µA max leakage at 1 V ensures sub-µA standby current contribution - extends battery life beyond 3 years in clinical wearables.

Use Scenario: Enabling controlled power-up sequencing of 3.3 V and 1.8 V rails via Zener-triggered enable logic in smart home hubs.

IC Role / Device Role / Timing Role: Threshold detector that asserts reset or enable signal when main supply crosses 2.4 V during cold start.

Use Value: Tight ±5% V_Z tolerance and −3 mV/°C TC allow predictable turn-on timing across commercial temperature range without calibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMSZ2V4T1G	No SZ prefix; not AEC−Q101 qualified; same electrical specs and SOD−123 package.	Intended for industrial/commercial use only; lacks automotive qualification documentation and PPAP support.	Select when AEC−Q101 compliance is unnecessary and cost sensitivity outweighs automotive traceability requirements.
BZX84-C2V4	Higher Z_ZT (120 Ω vs. 100 Ω); 350 mW P_D; SOT−23 package (larger footprint, different thermal profile).	Less suitable for high-density automotive PCBs; lower power rating limits surge handling in noisy environments.	Choose only if SOT−23 is already standardized in legacy designs and 2.4 V regulation tolerance can accommodate higher dynamic impedance.

Compared with MMSZ2V4T1G and BZX84-C2V4, SZMMSZ2V4T1G uniquely combines AEC−Q101 qualification, 500 mW power capability in compact SOD−123, and ≤100 Ω Z_ZT - making it the sole option for new automotive designs requiring both reliability assurance and space-constrained layout.

Availability

SZMMSZ2V4T1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial 4–20 mA transmitters, and medical wearable battery monitoring systems requiring stable component supply with full traceability and lifecycle management.

Supply support for SZMMSZ2V4T1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMMSZxxxT1G series belongs to onsemi's automotive-qualified Zener regulator portfolio, designed specifically for voltage reference, overvoltage protection, and biasing in harsh-environment electronic control modules.

FAQ

What is the Zener voltage tolerance for SZMMSZ2V4T1G?

The SZMMSZ2V4T1G has a nominal Zener voltage of 2.4 V with a standard tolerance of ±5%, resulting in a guaranteed range of 2.28 V to 2.52 V when tested at I_ZT = 5 mA and T_A = 25°C. This tolerance is maintained across the full operating temperature range and is part of the AEC−Q101 qualification testing protocol for the SZMMSZ2V4T1G.

Is SZMMSZ2V4T1G suitable for automotive applications?

Yes, SZMMSZ2V4T1G is AEC−Q101 qualified and PPAP capable, with full documentation supporting its use in automotive applications such as engine control sensors, body electronics, and ADAS subsystems. The "SZ" prefix explicitly denotes compliance with automotive-specific site and change control requirements, distinguishing it from commercial-grade MMSZ2V4T1G variants.

What is the maximum power dissipation for SZMMSZ2V4T1G at 100°C ambient?

At 100°C ambient, SZMMSZ2V4T1G derates from its 500 mW rating at 75°C by 6.7 mW/°C, yielding 332.5 mW maximum continuous power dissipation. This value assumes mounting on FR−5 board with specified thermal conditions; actual performance depends on PCB copper area and airflow, and must be verified using the steady-state derating curve in Figure 3 of the official datasheet.

Does SZMMSZ2V4T1G have a defined temperature coefficient?

Yes, SZMMSZ2V4T1G exhibits a negative temperature coefficient of approximately −3 mV/°C near its 2.4 V nominal Zener voltage, as shown in Figure 1 of the datasheet. This coefficient impacts long-term reference stability in wide-temperature applications and should be factored into system-level error budgeting when using SZMMSZ2V4T1G as a precision voltage reference.

What packaging options are available for SZMMSZ2V4T1G?

SZMMSZ2V4T1G is supplied in Pb−free SOD−123 package on 3,000-piece tape-and-reel (order code SZMMSZ2V4T1G). The package features a cathode band marking, conforms to UL 94 V−0 flammability rating, and supports IR reflow per J-STD-020 with peak temperature up to 260°C for 10 seconds - consistent with industry-standard lead-free assembly processes.

SZMMSZ2V4T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 2.4 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 50 µA @ 1 V

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

Operating Temperature:: -55°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

SZMMSZ2V4T1G FAQ

1.How can I place an order for SZMMSZ2V4T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMMSZ2V4T1G 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 SZMMSZ2V4T1G reliable?

The price and inventory of SZMMSZ2V4T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ2V4T1G is usually 5 days.

3.What payment methods are accepted for SZMMSZ2V4T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ2V4T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMMSZ2V4T1G?

SZMMSZ2V4T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMMSZ2V4T1G 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 SZMMSZ2V4T1G?

For technical support, including SZMMSZ2V4T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ2V4T1G requirements.

6.How does Aetrix verify that SZMMSZ2V4T1G is sourced from the original manufacturer or authorized distributors?

All SZMMSZ2V4T1G 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 SZMMSZ2V4T1G meets industry standards.

7.What is the process for return or replacement of SZMMSZ2V4T1G?

All SZMMSZ2V4T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ2V4T1G, 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 SZMMSZ2V4T1G part is unused and in its original packaging.

Return procedure for SZMMSZ2V4T1G:

1.Submit a request within 90 days.

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

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