SM4T23CAY STMicroelectronics TVS Diode (Bi-directional) (Diodes Moulded Non Polarised) In Stock
SM4T23CAY is an automotive-grade bidirectional TVS diode from STMicroelectronics with a 400 W peak power rating and 23.4 V nominal breakdown voltage in a compact SMA (DO-214AC) package. It clamps transients to a maximum of 42.8 V, protecting automotive electronics from load-dump and ESD events. Available from stock worldwide with fast shipping.
- Manufacturer
- STMicroelectronics
- Package
- Diodes Moulded Non Polarised
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SM4T23CAY Datasheet PDF
- Category
- TVS Diode (Bi-directional)
- Price
- From $0.2260(MOQ 1)
- Temp Range
- -55.0°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 400 W peak pulse power handling in the compact SMA DO-214AC package enabling high-energy transient protection with minimal board area
- Automotive-grade AEC-Q101 qualified device ensuring reliable operation across the full -40 degrees C to +150 degrees C temperature range
- Bidirectional configuration with 23.4 V nominal breakdown protecting both signal lines and power rails from positive and negative transient spikes
- 42.8 V maximum clamping voltage providing over 2x margin above the 12 V automotive nominal bus for robust load-dump protection
Applications
The SM4T23CAY is designed for automotive ECU power supply lines, CAN and LIN bus interface protection, and battery-connected circuit rails that must withstand load-dump transients up to 400 W as specified in ISO 7637. Its bidirectional operation makes it suitable for protecting both supply rails and communication lines where reverse polarity transients can occur during fault conditions. The device is also used in industrial equipment powered from 24 V DC bus systems where surge events from relay switching or inductive load disconnection require clamping to a safe voltage level.
Specifications
| Factory Lead Time | 53 Weeks, 1 Day |
| YTEOL | 6.1 |
| Breakdown Voltage-Max | 24.6V |
| Breakdown Voltage-Min | 22.2V |
| Breakdown Voltage-Nom | 23.4V |
| Clamping Voltage-Max | 42.8V |
| Configuration | SINGLE, 1 CHANNEL |
| Diode Element Material | SILICON |
| Diode Type | TRANS VOLTAGE SUPPRESSOR DIODE |
| JEDEC-95 Code | DO-214AC |
| JESD-30 Code | R-PDSO-C2 |
| JESD-609 Code | e3 |
| Non-rep Peak Rev Power Dis-Max | 400W |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Polarity | BIDIRECTIONAL |
| Qualification Status | Not Qualified |
| Reference Standard | AEC-Q101; IEC-61000-4-2; ISO 10605 |
| Rep Pk Reverse Voltage-Max | 20V |
| Reverse Current-Max | 0.2 µA |
| Reverse Test Voltage | 20V |
| Surface Mount | YES |
| Technology | AVALANCHE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | C BEND |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Diodes Moulded Non Polarised |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.50 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What peak pulse power can SM4T23CAY absorb during a load-dump transient on a 12 V automotive bus?
SM4T23CAY is rated for 400 W peak pulse power with a 10/1000 µs waveform, which exceeds the typical 250 W requirement of ISO 7637-2 pulse 5a for 12 V automotive systems. The clamping voltage stays at or below 42.8 V during the event, protecting downstream ECU circuits rated for 24 V or less.
How does the bidirectional structure of SM4T23CAY protect a CAN bus transceiver from both positive and negative spikes?
The bidirectional back-to-back silicon junction conducts transient current in both polarities, clamping positive spikes above 42.8 V and negative spikes below -42.8 V on each bus line. This symmetric protection is essential for differential CAN lines because common-mode ground shifts and inductive coupling can inject negative transients as large as -100 V during harness-fault events.
Over what temperature range is SM4T23CAY specified, and does it remain qualified for under-hood automotive locations?
SM4T23CAY is rated from -40 degrees C to +150 degrees C junction temperature, which qualifies it for under-hood AEC-Q101 Grade 0 thermal environments. The breakdown voltage shifts by less than 0.1% per degree C, so the nominal 23.4 V remains within the 22.2 V to 24.6 V specification band across the full automotive temperature range.
How does the SMA package footprint of SM4T23CAY affect board routing in a compact automotive ECU layout?
The DO-214AC SMA package measures 4.4 x 2.7 mm with a 1.2 mm profile, occupying less than 12 mm2 of PCB area and fitting in a standard SOD-123-compatible land pattern on many automotive PCBs. This compact footprint allows placement within 5 mm of the connector pin it protects, minimising stub inductance and keeping peak clamping voltage below the 42.8 V specification during fast-edge transients.
Related Guides
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
ADAQ7768-1 Design Guide for Precision Vibration and Dynamic Signal Measurement
Design ADAQ7768-1 precision data acquisition channels for vibration and dynamic sensing with the right bandwidth, reference, clock, and layout choices.
Jun 30, 2026
AD5204BRZ10 Design Guide for SPI-Controlled Gain and Offset Calibration
Design AD5204BRZ10 digital potentiometer calibration loops with bounded trim span, safe wiper current, clean SPI routing, and reliable startup codes.
Jun 30, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.2235 | $1.22 |
| 10+ | $0.9200 | $9.20 |
| 100+ | $0.6100 | $61.00 |
| 250+ | $0.2936 | $73.40 |
| 500+ | $0.2569 | $128.45 |
| 1000+ | $0.2260 | $226.00 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”