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Vishay General Semiconductor - Diodes Division SM15T27AHM3_A/H
- Part No.:
- SM15T27AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27AHM3_A/H.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM15T27AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 23.1 V stand-off voltage (VWM), 25.7–28.4 V breakdown voltage (VBR), and 37.5 V maximum clamping voltage (VC) at 40.0 A peak pulse current - used to protect automotive sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T27AHM3_A/H datasheet, SM15T27AHM3_A/H pinout, SM15T27AHM3_A/H application, or SM15T27AHM3_A/H equivalent, key selection criteria include verified clamping performance under 10/1000 μs surge, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (25.7–28.4 V), it avalanches into low-impedance conduction to divert transient energy away from downstream ICs or MOSFETs. Its 1500 W PPPM rating applies strictly to the standardized 10/1000 μs double-exponential waveform per IEC 61000-4-5.
Thermal design relies on RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient, measured on 8.0 mm × 8.0 mm copper pads). It features glass-passivated junction, MSL Level 1 moisture sensitivity, and fails short-circuit under overstress - a defined safety behavior critical for automotive fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; sets upper limit for normal circuit bias. |
| VBR @ IT = 1.0 mA | 25.7–28.4 V - guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| VC @ IPPM = 40.0 A (10/1000 μs) | 37.5 V - clamped voltage seen by protected circuit during worst-case surge; defines maximum stress on downstream components. |
| PPPM | 1500 W - peak transient power handling capability; validates suitability for ISO 7637-2 Pulse 1/2b and IEC 61000-4-5 Level 4 threats. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments with sustained ambient up to +125 °C. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including HTOL, TC, AC/DC HAST, and mechanical shock testing per AEC specification. |
Pinout & Package
SM15T27AHM3_A/H uses the standard SMC (DO-214AB) package: a molded plastic case with two coplanar matte tin-plated leads. Polarity is unidirectional; the cathode is marked by a visible band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; completes current path during reverse-biased clamping event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., sensor supply or signal); carries full IPPM surge current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validates robust protection against severe automotive load-dump and lightning-simulated surges without derating. |
| Halogen-free, RoHS-compliant construction | Meets automotive OEM material restrictions (e.g., GMW3172, Ford WSS-M99P9999-A1) and supports lead-free reflow profiles. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs - critical for 24 V systems where margin above 3.3 V/5 V logic rails is tight. |
| MSL Level 1, peak reflow ≤ 260 °C | Enables single-pass reflow assembly without baking or special handling; reduces manufacturing cost and risk of moisture damage. |
| Fail-short failure mode | Provides deterministic fault behavior: open-circuit detection via continuity test or blown fuse upstream, enabling safe system diagnostics. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between sensor VSUPPLY and chassis ground to clamp transients before they reach precision ADC inputs. Use Value: Limits clamped voltage to 37.5 V, ensuring downstream 24 V-rated op-amps and regulators remain within absolute maximum ratings during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers connected to external field wiring subject to inductive kickback. IC Role / Device Role / Timing Role: Reverse-biased TVS on each input channel, referenced to common ground, absorbing switching spikes from solenoid valves or relay coils. Use Value: Withstands 40 A peak pulses while maintaining <1 μA leakage at 23.1 V, preserving input logic threshold integrity and reducing false triggering in noisy factory environments. |
| Telecom Power Rail Protection | Computer Peripheral Port Protection |
Use Scenario: Guarding 24 V DC power inputs of remote radio units against induced surges from nearby lightning strikes on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on main DC input rail, upstream of DC/DC converters and EMI filters, acting as first-line energy diversion device. Use Value: 1500 W rating handles IEC 61000-4-5 Combination Wave (1.2/50 μs voltage, 8/20 μs current) up to Level 4 (4 kV/2 kA), meeting EN 61000-6-2 immunity requirements. |
Use Scenario: Securing USB-C or RS-485 data lines in industrial docking stations where hot-plug events and cable ESD generate fast transients. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on VBUS or differential pairs, leveraging low inductance (<1 nH) of SMC package to preserve signal integrity. Use Value: Clamps sub-100 ns transients to <37.5 V within 1 ns response time, preventing latch-up in USB PHY transceivers and maintaining eye diagram compliance at 10 Gbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | Same SMC package, 24 V VWM, but lower PPPM (400 W); VC = 38.9 V @ 10.3 A. | Rated only for IEC 61000-4-5 Level 2 (1 kV/0.5 kA); insufficient for automotive load dump or telecom surge standards. | Select only for cost-sensitive consumer electronics with benign threat profiles and no AEC-Q101 requirement. |
| ON Semiconductor 1.5SMC27A | Identical electrical specs (23.1 V VWM, 37.5 V VC @ 40 A), same SMC package, but not AEC-Q101 qualified; RoHS-compliant only. | Lacks automotive qualification testing - unsuitable for Tier 1 vehicle subsystems requiring PPAP documentation and long-term reliability validation. | Acceptable for industrial or telecom designs where AEC-Q101 is not mandated, but requires full requalification if migrated to automotive programs. |
Compared with SMAJ24A and 1.5SMC27A, SM15T27AHM3_A/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free construction - making it the only option among the three validated for high-reliability 24 V automotive sensor nodes requiring zero-failure field performance.
Availability
SM15T27AHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom remote radio units, and computer peripheral docking stations requiring stable component supply across multi-year production cycles.
Supply support for SM15T27AHM3_A/H 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, TVS devices, and optoelectronics with emphasis on high-reliability, high-power, and automotive-grade solutions.
The SM15T Series was engineered specifically for demanding transient suppression in 12 V/24 V automotive and industrial systems - delivering high-power clamping in compact SMC packages with AEC-Q101 qualification and fail-safe short-circuit behavior.
FAQ
What is the clamping voltage of SM15T27AHM3_A/H at its rated peak pulse current?
The SM15T27AHM3_A/H has a maximum clamping voltage (VC) of 37.5 V when subjected to a 10/1000 μs waveform at 40.0 A peak pulse current (IPPM). This value is measured per Fig. 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T27AHM3_A/H maintains this clamping performance across its specified operating temperature range.
Is SM15T27AHM3_A/H qualified to AEC-Q101, and what does that qualification cover?
Yes, SM15T27AHM3_A/H is AEC-Q101 qualified - confirmed by its HM3 suffix and documentation in Vishay's SM15T series datasheet (Rev. 09-Jan-2024, Doc. #88380). This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), autoclave (AC/DC HAST), and mechanical shock, validating reliability for automotive under-hood and chassis applications. The SM15T27AHM3_A/H meets all required failure rate and parametric shift limits per AEC specification.
What is the meaning of the "HM3" and "_A/H" suffixes in SM15T27AHM3_A/H?
In SM15T27AHM3_A/H, "HM3" denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification; "_A/H" specifies packaging: "A" indicates tape-and-reel format, and "H" is the preferred package code for 7-inch diameter reels containing 850 units. This ordering code maps directly to Vishay's documented delivery mode in Section 5 of document 88380. The SM15T27AHM3_A/H is not a variant - it is the full commercial part number reflecting material, qualification, and packaging.
Does SM15T27AHM3_A/H have bidirectional capability, and how is polarity identified?
No, SM15T27AHM3_A/H is strictly unidirectional - confirmed by its "A" suffix (not "CA") and cathode-band marking per Vishay's SM15T family documentation. The band identifies the cathode terminal, which must be connected to the line being protected (e.g., 24 V supply rail), while the anode connects to ground. Bidirectional versions use "CA" suffix (e.g., SM15T27CA) and lack polarity marking. Using SM15T27AHM3_A/H in bidirectional configurations would result in forward conduction and permanent damage.
What is the thermal resistance and recommended PCB layout for optimal performance of SM15T27AHM3_A/H?
The SM15T27AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay document 88380. To achieve this rating, designers must implement minimum pad dimensions matching the SMC outline, use ≥2 oz copper, and avoid thermal reliefs on mounting pads. The SM15T27AHM3_A/H also exhibits RθJL = 15 °C/W (junction-to-lead), supporting efficient heat transfer through solder joints into internal PCB planes.
SM15T27AHM3_A/H 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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)
SM15T27AHM3_A/H FAQ
1.How can I place an order for SM15T27AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27AHM3_A/H 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 SM15T27AHM3_A/H reliable?
The price and inventory of SM15T27AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM15T27AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27AHM3_A/H?
SM15T27AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27AHM3_A/H 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 SM15T27AHM3_A/H?
For technical support, including SM15T27AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27AHM3_A/H requirements.
6.How does Aetrix verify that SM15T27AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T27AHM3_A/H 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 SM15T27AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM15T27AHM3_A/H?
All SM15T27AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27AHM3_A/H, 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 SM15T27AHM3_A/H part is unused and in its original packaging.
Return procedure for SM15T27AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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