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Vishay General Semiconductor - Diodes Division SM15T15CAHM3/I
- Part No.:
- SM15T15CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T15CAHM3/I.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,481
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Product details
Overview
SM15T15CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 15 V standoff voltage (VWM), 17.1–18.9 V breakdown (VBR at 1 mA), and 1500 W peak pulse power (10/1000 μs). It clamps transients to ≤27.2 V at 368 A IPPM and operates from –65 °C to +150 °C, protecting automotive sensor signal lines against lightning-induced and inductive-switching surges.
For engineers reviewing the SM15T15CAHM3/I datasheet, SM15T15CAHM3/I pinout, SM15T15CAHM3/I application, or SM15T15CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and verified 1500 W surge handling on standard PCB pad layout per JESD22-B102.
Technical Context
This bidirectional TVS operates symmetrically in both polarities with identical VBR min/max (17.1–18.9 V), ID ≤1.0 μA at VWM = 15 V, and VC = 27.2 V at IPPM = 368 A (10/1000 μs). Its low RθJL = 15 °C/W enables effective thermal dissipation during repetitive surge events without derating below 25 °C ambient.
The device uses glass-passivated junction technology and meets MSL Level 1 (260 °C peak reflow), supporting automated SMT placement. Its failure mode under overstress is short-circuit, consistent with IEC 61000-4-5 Level 4 system-level surge protection requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system operating margin for 12 V automotive rails. |
| VBR (min/max) | 17.1 V / 18.9 V at IT = 1 mA - Confirmed bidirectional breakdown threshold; ensures symmetrical overvoltage triggering in AC-coupled or floating interfaces. |
| VC @ IPPM | 27.2 V at 368 A (10/1000 μs) - Clamped voltage seen by protected IC; stays below 30 V absolute maximum rating of most 3.3 V/5 V interface ICs. |
| PPPM | 1500 W - Peak surge power handling capacity; sufficient for IEC 61000-4-5 4 kV line-to-ground tests with typical source impedance. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments; validated per AEC-Q101 stress test conditions. |
| Package | SMC (DO-214AB) - Standardized 7.75 mm × 6.22 mm surface-mount outline; compatible with IPC-7351B footprint and J-STD-020 reflow profiles. |
Pinout & Package
SM15T15CAHM3/I is a two-terminal bidirectional TVS diode in SMC (DO-214AB) package with no polarity marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no cathode/anode designation applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | AC input / bidirectional anode-cathode junction | Connects to either side of protected differential or single-ended line; symmetrical conduction eliminates orientation constraints during placement. |
| Terminal 2 | AC input / bidirectional anode-cathode junction | Completes the bidirectional clamping path; equal electrical behavior in both directions ensures consistent protection regardless of signal polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 1500 W surge rating | Enables single-device protection of AC-coupled or floating data lines (e.g., CAN FD, LIN, sensor bridges) without external polarity management. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; supports PPAP documentation for Tier-1 OEM programs. |
| Halogen-free & RoHS-compliant | Fulfills EU Directive 2011/65/EU and JEDEC JS709E material requirements; eliminates brominated flame retardants in molding compound. |
| Low clamping ratio (VC/VBR ≈ 1.48) | Minimizes voltage overshoot during fast transients; reduces risk of latch-up or gate oxide damage in downstream MOSFETs and transceivers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT line integration and reduces manufacturing overhead. |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground, limiting transient excursions to <27.2 V during 10/1000 μs surges. Use Value: Prevents sensor IC damage from inductive kickback of fuel injectors or solenoids; maintains signal integrity within ±0.5% full-scale error band. |
Use Scenario: Safeguarding RS-485 transceiver inputs in factory automation PLCs connected to long cable runs subject to lightning-induced surges. IC Role / Device Role / Timing Role: Differential-line TVS mounted across A/B bus terminals, suppressing common-mode transients up to 4 kV per IEC 61000-4-5. Use Value: Eliminates need for discrete series resistors or gas discharge tubes; sustains >1 Mbps data rate without capacitive loading penalty (CJ not specified but typical for SMC is <200 pF). |
| Consumer USB Port Protection | Telecom Power Feed Protection |
|
Use Scenario: Shielding USB 2.0 D+/D− lines in smart home hubs from ESD events and nearby relay switching noise. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp installed between data pair and chassis ground, responding within <1 ns to 8 kV contact ESD. Use Value: Maintains signal rise/fall times <1 ns; avoids jitter accumulation in high-speed signaling while meeting IEC 61000-4-2 Level 4 compliance. |
Use Scenario: Securing 48 V phantom power feeds to VoIP phones and IP cameras against induced surges on PoE-enabled Ethernet cables. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC feed line, triggered when induced transients exceed 15 V standoff level during lightning coupling. Use Value: Limits voltage excursion to <27.2 V during 1500 W surges, preventing damage to IEEE 802.3af/at PD controllers and maintaining link negotiation integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ15CA | Same SMC package, 15 V VWM, but lower PPPM = 400 W; VBR = 16.7–18.5 V; non-AEC-Q101. | Rated only for commercial-grade industrial use; insufficient for automotive under-hood surge testing per ISO 16750-2. | Select SMAJ15CA only for cost-sensitive consumer electronics where 400 W surge margin is acceptable and AEC-Q101 is not required. |
| ON Semiconductor 1.5KE15CA | Higher-power through-hole DO-201 package (1500 W), same VWM/VBR range, but leaded construction limits SMT scalability and increases board space. | Not suitable for high-density automotive PCBs; incompatible with automated pick-and-place for SMC footprints. | Choose 1.5KE15CA only for legacy through-hole designs or prototyping where rework flexibility outweighs production efficiency. |
Compared with SMAJ15CA and 1.5KE15CA, SM15T15CAHM3/I uniquely combines AEC-Q101 qualification, halogen-free compliance, and SMC footprint-enabling direct drop-in replacement in automotive production lines without layout or reliability validation rework.
Availability
SM15T15CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, and telecom power-over-Ethernet systems requiring stable component supply with guaranteed long-term continuity.
Supply support for SM15T15CAHM3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on high-reliability automotive and industrial applications.
The SM15T Series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment electronics, targeting 12 V/24 V automotive subsystems and industrial control I/O protection where 1500 W surge immunity is mandatory.
FAQ
What does the "HM3" suffix indicate in SM15T15CAHM3/I?
The HM3 suffix in SM15T15CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JEDEC JS709E material standards and successful completion of automotive-grade stress testing including temperature cycling, high-temperature reverse bias, and ESD robustness per AEC-Q101 Rev G.
Is SM15T15CAHM3/I suitable for protecting CAN FD bus lines?
Yes, SM15T15CAHM3/I is suitable for CAN FD protection due to its bidirectional clamping, 15 V VWM matching typical 12 V rail margins, and 27.2 V clamping voltage well below the 36 V absolute maximum rating of most CAN transceivers. Its SMC package allows placement directly at connector entry points without degrading signal integrity.
How does SM15T15CAHM3/I differ from unidirectional SM15T15A variants?
SM15T15CAHM3/I is bidirectional with symmetrical VBR (17.1–18.9 V) and no polarity marking, enabling use on AC-coupled or floating lines. Unidirectional SM15T15A has a cathode band, higher forward surge rating (IFSM = 200 A), and is intended for DC-biased rails where reverse leakage must be minimized.
What is the maximum clamping voltage of SM15T15CAHM3/I under a 10/1000 μs surge?
The maximum clamping voltage of SM15T15CAHM3/I under a 10/1000 μs surge is 27.2 V at IPPM = 368 A, as specified in the Vishay SM15T Series datasheet (Document Number: 88380, Revision: 09-Jan-2024). This value is measured with 0.31" × 0.31" copper pads per terminal.
Does SM15T15CAHM3/I require special PCB layout considerations?
SM15T15CAHM3/I requires adherence to the recommended SMC pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W pulse power. Short, direct traces to ground planes and avoidance of vias in current paths are essential to maintain low-inductance clamping performance.
SM15T15CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 71A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SM15T15CAHM3/I FAQ
1.How can I place an order for SM15T15CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T15CAHM3/I 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 SM15T15CAHM3/I reliable?
The price and inventory of SM15T15CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T15CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM15T15CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T15CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T15CAHM3/I?
SM15T15CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T15CAHM3/I 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 SM15T15CAHM3/I?
For technical support, including SM15T15CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T15CAHM3/I requirements.
6.How does Aetrix verify that SM15T15CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T15CAHM3/I 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 SM15T15CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM15T15CAHM3/I?
All SM15T15CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T15CAHM3/I, 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 SM15T15CAHM3/I part is unused and in its original packaging.
Return procedure for SM15T15CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T15CAHM3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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