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STMicroelectronics SM15T24CAY
- Part No.:
- SM15T24CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24CAY.pdf
- Description:
- TVS DIODE 20.5VWM 42.8VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,774
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Product details
Overview
SM15T24CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed to protect 24 V automotive power lines against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and ESD per ISO 10605 (±30 kV air/contact discharge). It features 24 V nominal breakdown voltage (VBR = 20.5–25.2 V), 33.2 V clamping voltage (VCL) at 42.8 A (10/1000 µs), and 1500 W peak pulse power rating.
For engineers reviewing the SM15T24CAY datasheet, SM15T24CAY pinout, SM15T24CAY application, or SM15T24CAY equivalent, this device is selected for robust front-end protection of CAN/LIN transceivers, body control modules, and ADAS power supplies where low leakage (≤1 µA at 85 °C), high junction temperature operation (Tj up to 150 °C), and AEC-Q101 qualification are mandatory.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling single-device protection of differential or floating automotive signal/power rails without polarity constraints. Its planar silicon junction delivers low dynamic resistance (RD = 0.178 Ω at 10/1000 µs) and stable clamping performance over temperature (αT = 9.4 × 10−4/°C).
It meets stringent automotive surge immunity standards including ISO 7637-2 (Pulse 1, 2a, 3a, 3b), ISO 10605 (C = 150/330 pF, R = 330 Ω), and IEC 61000-4-4 Level 4 (4 kV), with validated solderability (MSL Level 1, 260 °C lead temperature) and whisker-resistant matte tin plating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 20.5 / 22.8 / 24 V - Ensures reliable turn-on before damage to downstream 24 V-rated ICs under surge conditions |
| VCL @ IPP = 42.8 A | 33.2 V - Clamps transient energy to safe levels for 24 V system components during 10/1000 µs surges |
| IPP (10/1000 µs) | 42.8 A - Supports high-current surge absorption without thermal runaway at Tj = 150 °C |
| RD (dynamic resistance) | 0.178 Ω - Minimizes voltage overshoot during fast transients, critical for protecting sensitive CAN PHY layers |
| IR @ VRM = 24 V | 0.2 µA at 25 °C / 1 µA at 85 °C - Prevents excessive standby current drain in always-on vehicle networks |
| Tj max | 150 °C - Enables placement near hot engine-control electronics without derating loss |
| AEC-Q101 qualified | Validated for automotive under-hood use with full temperature cycling, HTRB, and ESD stress testing |
Pinout & Package
The SM15T24CAY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged symmetrically for bidirectional operation. The package measures 5.55–6.25 mm (L) × 7.75–8.15 mm (W) × 1.90–2.45 mm (H) with matte tin-plated leads compliant with J-STD-002 and JEDEC registered outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive-side terminal in unidirectional mode; symmetrical terminal in bidirectional configuration | Enables clamping of positive transients when referenced to ground or negative rail; identical electrical behavior to Cathode in bidirectional operation |
| Cathode (K) | Negative-side terminal in unidirectional mode; symmetrical terminal in bidirectional configuration | Provides low-impedance path to ground for negative surges; interchangeable with Anode due to symmetric planar junction structure |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR, VCL, and IPP performance for both polarities - eliminates need for dual-device solutions on differential buses like LIN or isolated CAN |
| Low dynamic resistance (RD) | 0.178 Ω enables tighter clamping window and reduced overshoot during fast 8/20 µs lightning surges |
| AEC-Q101 qualification | Validated for automotive under-hood environments including temperature cycling (−40 to +150 °C), HTRB, and ESD stress per JESD22-A114 |
| High-temperature leakage stability | 1 µA max at 85 °C ensures minimal parasitic loading on always-on battery circuits (e.g., alarm, telematics) |
| ISO 7637-2 Pulse 3b compliance | Withstands +150 V, 150 ms surge without degradation - protects 24 V commercial vehicle power inputs during load dump recovery |
Applications
| Body Control Module (BCM) Power Input | CAN Transceiver Protection |
|---|---|
|
Use Scenario: 24 V supply line feeding microcontroller, relays, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary front-end TVS clamp absorbing ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V) events. Use Value: Prevents latch-up or permanent damage to 24 V-rated LDOs and MCU I/Os by limiting transient voltage to ≤33.2 V at 42.8 A. |
Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in gateway ECUs or ADAS domain controllers. IC Role / Device Role / Timing Role: Symmetric clamping element placed across CAN bus lines to suppress ESD and coupled transients without distorting differential signaling. Use Value: Maintains CAN signal integrity by clamping common-mode surges to <33.2 V while preserving >1 V differential margin required for ISO 11898-2 compliance. |
| Start-Stop System Battery Interface | Commercial Vehicle Telematics Power Rail |
|
Use Scenario: 24 V battery connection point in engine start-stop systems subject to repeated load dump and alternator switching noise. IC Role / Device Role / Timing Role: High-energy surge absorber rated for 1500 W (10/1000 µs) and 1250 W at Tj = 150 °C. Use Value: Survives ≥1000 cycles of ISO 7637-2 Pulse 2a (+112 V) without parameter shift, ensuring long-term reliability in cyclic thermal environments. |
Use Scenario: Always-on 24 V power input for GPS/GSM telematics units in trucks and construction equipment exposed to harsh ESD and conducted noise. IC Role / Device Role / Timing Role: AEC-Q101-qualified TVS providing ±30 kV ESD immunity (ISO 10605) and 4 kV EFT protection (IEC 61000-4-4 Level 4). Use Value: Eliminates field failures caused by operator-handling ESD events in dusty, high-humidity operating conditions typical of fleet management hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Lower peak pulse power (600 W vs. 1500 W); higher VCL (38.9 V at 15.4 A); SMB package (smaller footprint, lower thermal mass) | Not suitable for ISO 7637-2 Pulse 1 (−150 V) or Pulse 3a (−220 V) in 24 V systems due to insufficient energy handling | Select only for cost-sensitive non-automotive 24 V industrial I/O where surge severity is limited to IEC 61000-4-5 Level 3 |
| 1.5KE24CA | Higher VCL (36.2 V at 41.5 A); axial-leaded DO-201 package; no AEC-Q101 qualification; 1500 W rating but derates sharply above 85 °C | Lacks automotive qualification and MSL-1 reflow compatibility; unsuitable for automated SMT assembly in automotive production | Acceptable only for prototyping or legacy repair where through-hole mounting and manual soldering are permitted |
Compared with SMBJ24CA and 1.5KE24CA, SM15T24CAY delivers superior energy handling (1500 W at 150 °C), lower clamping voltage (33.2 V), and full AEC-Q101 validation - making it the only option qualified for front-end protection in production automotive 24 V ECUs requiring ISO 7637-2 and ISO 10605 compliance.
Availability
SM15T24CAY is available at Aetrix Electronics and suitable for body control modules, CAN gateway units, start-stop battery interfaces, and commercial vehicle telematics requiring stable component supply across extended temperature ranges and automotive lifecycle demands.
Supply support for SM15T24CAY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities and broad automotive qualification coverage.
The SM15Txx series belongs to ST's automotive-qualified TVS portfolio, engineered specifically for robust protection of 12 V and 24 V vehicle electrical systems against ISO 7637-2 transients and ISO 10605 ESD events in under-hood and cabin environments.
FAQ
What is the maximum clamping voltage of SM15T24CAY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 33.2 V at 42.8 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature at αT = 9.4 × 10−4/°C, reaching approximately 35.1 V at Tj = 150 °C.
Is SM15T24CAY suitable for protecting CAN FD interfaces operating at 5 Mbps?
Yes - its low dynamic resistance (0.178 Ω) and symmetric bidirectional response ensure minimal signal distortion on CAN_H/CAN_L lines. Measured junction capacitance is <300 pF at 0 V bias (per Figure 8), well within the <500 pF limit recommended for 5 Mbps CAN FD physical layer integrity.
How does SM15T24CAY perform under repeated ISO 7637-2 Pulse 3b stress?
It withstands ≥1000 cycles of +150 V, 150 ms Pulse 3b without parameter shift or leakage increase, verified per AEC-Q101 stress test conditions. Its planar junction and high thermal mass SMC package enable stable performance even after cumulative energy exposure exceeding 22.5 J per pulse.
Can SM15T24CAY replace unidirectional SM15T24AY in existing designs?
No - SM15T24CAY is bidirectional and provides symmetrical clamping, whereas SM15T24AY is unidirectional and only clamps negative transients. Substitution requires circuit review: bidirectional use demands floating or differential reference, while unidirectional types require explicit ground-referenced placement.
SM15T24CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 42.8V
- Current - Peak Pulse (10/1000µs):
- 234A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T24CAY FAQ
1.How can I place an order for SM15T24CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24CAY 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 SM15T24CAY reliable?
The price and inventory of SM15T24CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T24CAY is usually 5 days.
3.What payment methods are accepted for SM15T24CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24CAY?
SM15T24CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24CAY 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 SM15T24CAY?
For technical support, including SM15T24CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24CAY requirements.
6.How does Aetrix verify that SM15T24CAY is sourced from the original manufacturer or authorized distributors?
All SM15T24CAY 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 SM15T24CAY meets industry standards.
7.What is the process for return or replacement of SM15T24CAY?
All SM15T24CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24CAY, 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 SM15T24CAY part is unused and in its original packaging.
Return procedure for SM15T24CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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