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onsemi SZSMS24T1G
- Part No.:
- SZSMS24T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZSMS24T1G.pdf
- Description:
- TVS DIODE 24VWM 44VC SC74/SC59ML
- Quantity:
- Payment:
- Shipping:
Inventory:687
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Product details
Overview
SZSMS24T1G from onsemi is a quad unidirectional ESD and surge protector in SC-74 package, rated for 24 V working peak reverse voltage, 40 V clamping voltage at 8 A peak pulse current, and 350 W peak power dissipation (8 × 20 µs). It delivers Class N ESD protection (>25 kV HBM), IEC 61000-4-2 (15 kV air/8 kV contact), and AEC-Q101 qualification for automotive electronics.
For engineers reviewing the SZSMS24T1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 44 V at 8 A, low leakage (<1 µA at 24 V), 40–75 pF capacitance at 0 V, and SC-74 footprint compatibility with space-constrained portable and automotive interfaces.
Technical Context
The SZSMS24T1G integrates four independent unidirectional TVS diodes in a single SC-74 (Case 318F) monolithic silicon structure. Each channel provides precise breakdown at 26.7–32 V and clamps transients to ≤44 V at 8 A (8/20 µs), enabling robust protection of 24 V supply rails and signal lines.
It meets IEC 61000-4-4 (40 A EFT) and IEC 61000-4-5 (23 A surge), with thermal resistance of 556 °C/W and operating junction temperature from −55 °C to +150 °C - supporting under-hood automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 24 V - sets maximum continuous DC or AC peak voltage the device blocks without conduction |
| Clamping Voltage @ 8 A | 40 V - limits transient voltage seen by protected ICs during 8/20 µs surge events |
| Peak Pulse Power | 350 W - sustains high-energy transients per IEC 61000-4-5 Level 4 (23 A, 8/20 µs) |
| ESD Rating (HBM) | >25 kV - exceeds Class N for handling and assembly without damage |
| Capacitance @ 0 V, 1 MHz | 40–75 pF - low enough for USB 2.0, CAN FD, and 24 V sensor bus signal integrity |
| Leakage Current @ 24 V | <1 µA - avoids loading 24 V bias networks or high-impedance monitoring circuits |
| Breakdown Voltage Range | 26.7–32 V - ensures reliable turn-on before system overvoltage damages downstream components |
Pinout & Package
Package: SC-74 (Case 318F), surface-mount, 6-pin, Pb-free, RoHS-compliant, AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel 1) | Common cathode connection for first unidirectional TVS path; ties to protected line |
| 2 | Anode (Channel 1) | Anode reference for Channel 1; connects to ground or common return |
| 3 | Cathode (Channel 2) | Second independent cathode; enables discrete protection of dual 24 V signals |
| 4 | Cathode (Channel 3) | Third cathode terminal; supports three separate protected nodes in same footprint |
| 5 | Anode (Channel 2 & 3) | Shared anode for Channels 2 and 3 - reduces ground trace count vs. fully isolated layout |
| 6 | Cathode (Channel 4) | Fourth cathode; completes quad configuration for multi-rail or multi-signal protection |
Key Features
| Feature | Design Value |
|---|---|
| Quad unidirectional architecture | Enables independent protection of four 24 V signal or power lines without cross-talk or shared failure modes |
| AEC-Q101 qualification | Validated for automotive use including engine control modules, body controllers, and ADAS sensors |
| 350 W peak power rating | Withstands severe ISO 7637-2 pulse 5a/b surges and lightning-induced transients in 24 V systems |
| Low 40–75 pF capacitance | Maintains signal edge integrity on CAN, LIN, and analog sensor outputs up to 10 Mbps |
| UL 94 V-0 flammability rating | Meets safety requirements for enclosed automotive and industrial enclosures |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V Sensor Interface |
|---|---|
Use Scenario: Protecting LIN bus lines and switch inputs in BCM against load dump and ESD during service. IC Role / Device Role / Timing Role: Unidirectional TVS array clamping transients to ≤44 V while adding <75 pF capacitance per line. Use Value: Prevents microcontroller reset or input latch-up during door actuator switching or battery jump-start events. | Use Scenario: Safeguarding analog 4–20 mA transmitter outputs and digital status lines in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Quad-channel transient suppression on 24 V supply and three field-wire connections. Use Value: Eliminates need for discrete TVS per line, reducing BOM count and PCB area by 75% vs. single-diode solutions. |
| Commercial Vehicle Telematics Unit | Off-Highway Equipment Controller |
Use Scenario: Shielding GPS, cellular, and GNSS antenna feedlines and power inputs from induced surges in truck cab wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance clamping on RF-biased 24 V VCC and data lines with fast response (<1 ns). Use Value: Preserves RF sensitivity while meeting ISO 16750-2 pulse test requirements for heavy-duty vehicles. | Use Scenario: Hardening J1939 CAN bus termination and auxiliary 24 V control outputs in excavator hydraulic controllers exposed to welding EMI. IC Role / Device Role / Timing Role: Dual-purpose protection: clamps CAN_H/CAN_L differential transients and suppresses 24 V rail surges. Use Value: Enables single-component solution for both data and power line protection, simplifying EMC design validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD and surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMS24T1G | Same electrical specs, non-automotive grade; lacks AEC-Q101 qualification and SZ-prefix control traceability | Not approved for automotive production; suitable for industrial prototypes or cost-sensitive non-automotive designs | Select when AEC-Q101 is not required and PPAP documentation is unnecessary |
| SMF24AT1G | Single-channel, same 24 V VRWM and 44 V VC, but only 200 W peak power and no quad integration | Requires four devices + extra routing for quad protection; higher board area and assembly cost | Choose only if discrete layout flexibility or thermal isolation between channels is mandatory |
Compared with SMS24T1G and SMF24AT1G, SZSMS24T1G uniquely combines AEC-Q101 compliance, quad integration, and 350 W surge capability in SC-74 - making it optimal for space- and reliability-critical automotive 24 V systems where single-part qualification and reduced component count are essential.
Availability
SZSMS24T1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial 24 V sensor interfaces, and off-highway equipment controllers requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SZSMS24T1G 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
SZSMS24T1G belongs to the SMSxxT1G series of quad ESD/surge protectors designed specifically for high-reliability 24 V automotive and industrial systems needing compact, AEC-Q101-qualified transient suppression.
FAQ
What is the clamping voltage of SZSMS24T1G at 8 A peak pulse current?
The clamping voltage of SZSMS24T1G is 40 V at 8 A peak pulse current (8/20 µs waveform), as specified in the Electrical Characteristics table on page 2 of the official onsemi datasheet. This value ensures protected circuitry remains below critical overvoltage thresholds during surge events. The SZSMS24T1G maintains consistent clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SZSMS24T1G suitable for protecting CAN FD bus lines operating at 24 V?
Yes, SZSMS24T1G is suitable for CAN FD bus protection in 24 V systems due to its low 40–75 pF capacitance at 0 V and fast response time (<1 ns), which preserves signal integrity up to 5 Mbps. Its 40 V clamping voltage at 8 A and AEC-Q101 qualification make it appropriate for automotive CAN FD nodes. The SZSMS24T1G quad configuration allows simultaneous protection of CAN_H, CAN_L, VCC, and ground-referenced signals.
How does the pinout of SZSMS24T1G support multi-line protection without ground congestion?
The SZSMS24T1G uses a shared anode (Pin 5) for Channels 2 and 3, reducing required ground connections versus fully isolated layouts. Pins 1, 3, 4, and 6 serve as independent cathodes for four protected lines, while Pins 2 and 5 provide two anode paths - enabling efficient routing in dense 24 V control boards. This pinout minimizes ground loop risk and simplifies layout compared to four discrete TVS diodes, and is confirmed in the "PIN ASSIGNMENT" section of the onsemi datasheet.
Does SZSMS24T1G meet IEC 61000-4-5 Level 4 surge immunity requirements?
Yes, SZSMS24T1G meets IEC 61000-4-5 Level 4 (23 A, 8/20 µs) surge immunity, as verified by its 350 W peak pulse power rating and 44 V clamping voltage at 8 A. The device's ability to clamp 23 A surges to ≤44 V ensures downstream 24 V logic and analog components remain within safe operating limits. This performance is explicitly validated in the "ELECTRICAL CHARACTERISTICS" and "TYPICAL CHARACTERISTICS" sections of the SZSMS24T1G datasheet.
What is the difference between SZSMS24T1G and SMS24T1G beyond the prefix?
The SZ prefix in SZSMS24T1G denotes automotive-grade qualification: it is AEC-Q101 certified, PPAP-capable, and manufactured under enhanced process controls with unique site and change management. SMS24T1G shares identical electrical specs but lacks automotive traceability, qualification documentation, and controlled change protocols. Both use the same SC-74 package and pinout, but only SZSMS24T1G is approved for production automotive ECUs where functional safety and supply chain rigor are mandated.
SZSMS24T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 75pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZSMS24T1G FAQ
1.How can I place an order for SZSMS24T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZSMS24T1G 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 SZSMS24T1G reliable?
The price and inventory of SZSMS24T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZSMS24T1G is usually 5 days.
3.What payment methods are accepted for SZSMS24T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZSMS24T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZSMS24T1G?
SZSMS24T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZSMS24T1G 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 SZSMS24T1G?
For technical support, including SZSMS24T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZSMS24T1G requirements.
6.How does Aetrix verify that SZSMS24T1G is sourced from the original manufacturer or authorized distributors?
All SZSMS24T1G 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 SZSMS24T1G meets industry standards.
7.What is the process for return or replacement of SZSMS24T1G?
All SZSMS24T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZSMS24T1G, 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 SZSMS24T1G part is unused and in its original packaging.
Return procedure for SZSMS24T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZSMS24T1G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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