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onsemi SZMMSZ24T3G
- Part No.:
- SZMMSZ24T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ24T3G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,001
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Product details
Overview
SZMMSZ24T3G from onsemi is a 24 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 70 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 16.8 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMMSZ24T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, and direct alternatives for board-level voltage stabilization design.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 24 V regulation across load and line variations, with temperature coefficient near zero (≈0 mV/°C) in the 24 V range per onsemi typical curves. It supports pulsed surge power up to 100 W for 1 ms (rectangular waveform, TA = 25°C), enabling transient suppression in 24 V automotive systems.
Designed for FR−4/FR−5 PCBs, it exhibits 340°C/W junction-to-ambient thermal resistance and 150°C/W junction-to-lead resistance. Its ESD rating exceeds 16 kV (HBM Class 3), and it is Pb−Free, RoHS-compliant, and qualified to AEC−Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nominal / 25.2 V max at IZT = 5 mA - defines regulated output tolerance band for 24 V rail stabilization |
| Zener Impedance (ZZT) | 70 Ω max at IZT = 5 mA - determines output voltage deviation under dynamic load changes |
| Reverse Leakage (IR) | 0.05 μA max at VR = 16.8 V - ensures minimal quiescent current draw in standby mode |
| Power Dissipation (PD) | 500 mW at TL = 75°C, derated 6.7 mW/°C above - sets maximum continuous thermal load on PCB copper area |
| Junction Temp Range | −55°C to +150°C - enables operation in under-hood automotive environments without derating |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during automated assembly and field handling |
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; marked "X5" per onsemi marking diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes bias path for regulation current |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring PPAP documentation |
| 500 mW Power Rating | Enables robust voltage clamping in 24 V systems without external heat sinking on standard FR−4 PCBs |
| ±5% Zener Tolerance | Ensures predictable regulation window (22.8–25.2 V) for compatibility with 24 V supply monitoring thresholds |
| 16 kV HBM ESD Robustness | Eliminates need for additional ESD protection circuitry in automated SMT lines and end-equipment interfaces |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for microcontroller ADC in under-hood ECU exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 24 V rail monitoring and sensor biasing point. Use Value: Maintains <±1% regulation accuracy across −40°C to +125°C due to near-zero TC at 24 V, ensuring consistent ADC conversion. | Use Scenario: Protecting 24 V analog input channels of programmable logic controllers from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to safe levels during surge or wiring fault conditions. Use Value: Absorbs up to 100 W non-repetitive surge (1 ms pulse) without failure, preventing damage to downstream op-amps and ADCs. |
| Telecom Power Supply Monitoring | Medical Equipment 24 V Backup Rail |
Use Scenario: Monitoring 24 V DC-DC converter output in telecom base station power modules. IC Role / Device Role / Timing Role: Precision voltage threshold detector feeding comparator or supervisor IC. Use Value: Tight 5% tolerance and low 0.05 μA leakage enable accurate brown-out detection without loading the monitored rail. | Use Scenario: Providing fail-safe voltage reference for battery-backed 24 V auxiliary rail in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Low-power Zener reference maintaining calibration integrity during AC loss. Use Value: −55°C to +150°C operating range and AEC−Q101 qualification ensure reliability in safety-critical medical subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ24T3G | No SZ prefix; commercial grade (non-AEC−Q101); identical electrical specs and SOD−123 package | Not qualified for automotive production; suitable for industrial or consumer 24 V reference designs | Select when AEC−Q101 compliance is not required and cost optimization is prioritized |
| BZX84-C24LT1G | Higher ZZT (100 Ω max at 5 mA); same 24 V ±5% VZ; SOT−23 package (larger footprint, higher RJA) | Lower surge robustness and thermal performance; limited to lower-power applications | Choose only if SOT−23 is already standardized in legacy layout and 70 Ω ZZT is not critical |
Compared with MMSZ24T3G and BZX84-C24LT1G, SZMMSZ24T3G provides automotive-grade reliability with identical regulation performance and superior thermal impedance-making it the preferred choice for new 24 V system designs requiring long-term field stability.
Availability
SZMMSZ24T3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power monitors, and medical backup rails requiring stable component supply with full traceability and lifecycle support.
Supply support for SZMMSZ24T3G 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.
The MMSZ/SZMMSZ series was designed specifically for high-reliability voltage regulation in space-constrained, thermally demanding environments-especially automotive and industrial control systems requiring AEC−Q101 validation.
FAQ
What is the Zener voltage tolerance of SZMMSZ24T3G?
SZMMSZ24T3G has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 22.8 V and 25.2 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is guaranteed per onsemi's datasheet revision 13 and applies to all units in the production lot.
Is SZMMSZ24T3G qualified for automotive applications?
Yes, SZMMSZ24T3G is AEC−Q101 qualified and PPAP capable. The "SZ" prefix explicitly denotes compliance with automotive-grade requirements, including extended temperature operation (−55°C to +150°C), enhanced process controls, and stress testing beyond commercial-grade equivalents like MMSZ24T3G.
What is the maximum surge power rating for SZMMSZ24T3G?
SZMMSZ24T3G supports a maximum non-repetitive surge power of 100 W for pulse widths up to 1 ms (rectangular waveform, TA = 25°C), as shown in Figure 4 of the onsemi datasheet. This enables reliable transient suppression in 24 V automotive and industrial power systems.
Does SZMMSZ24T3G have a specified temperature coefficient?
Yes, per Figure 1 and Figure 2 in the onsemi datasheet, SZMMSZ24T3G exhibits a Zener voltage temperature coefficient near 0 mV/°C at 24 V, resulting in minimal drift across −55°C to +150°C. This makes it especially suitable for precision reference applications where thermal stability is critical.
What packaging options are available for SZMMSZ24T3G?
SZMMSZ24T3G is supplied in Pb−Free SOD−123 package on 10,000-unit tape-and-reel (order code ending in T3G). The device marking is "X5", and the cathode is identified by a band on lead 1. No other package variants (e.g., SOT−23 or DO−35) are offered for this specific part number.
SZMMSZ24T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 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
SZMMSZ24T3G FAQ
1.How can I place an order for SZMMSZ24T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ24T3G 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 SZMMSZ24T3G reliable?
The price and inventory of SZMMSZ24T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ24T3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ24T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ24T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ24T3G?
SZMMSZ24T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ24T3G 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 SZMMSZ24T3G?
For technical support, including SZMMSZ24T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ24T3G requirements.
6.How does Aetrix verify that SZMMSZ24T3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ24T3G 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 SZMMSZ24T3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ24T3G?
All SZMMSZ24T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ24T3G, 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 SZMMSZ24T3G part is unused and in its original packaging.
Return procedure for SZMMSZ24T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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