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Vishay General Semiconductor - Diodes Division SM15T39AHM3_A/H
- Part No.:
- SM15T39AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39AHM3_A/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,350
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Product details
Overview
SM15T39AHM3_A/H from Vishay General Semiconductor is a unidirectional 1500 W Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR at 1 mA), and 53.9 V clamping voltage (VC) at 28.0 A peak pulse current (IPPM). It protects MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial power electronics.
For engineers reviewing the SM15T39AHM3_A/H datasheet, SM15T39AHM3_A/H pinout, SM15T39AHM3_A/H application, or SM15T39AHM3_A/H equivalent, key selection criteria include verified clamping performance under 10/1000 μs waveform, 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 overvoltage protection device, triggered when reverse voltage exceeds VBR, entering avalanche conduction to shunt transient energy away from downstream circuitry. Its low-inductance SMC package and glass-passivated junction ensure fast response (<1 ns) and stable clamping under repetitive surge stress.
The device is rated for 1500 W peak pulse power (10/1000 μs), supports 200 A non-repetitive forward surge current (10 ms half-sine), and maintains operation across -65 °C to +150 °C junction temperature range. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line. |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - clamped voltage seen by protected IC during worst-case surge; determines maximum stress on downstream components. |
| PPPM | 1500 W - peak transient power it can absorb without failure; validates suitability for lightning and motor-switching threats. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs derating requirements above 25 °C ambient. |
| TJ max | +150 °C - maximum allowable junction temperature; sets upper limit for thermal design in enclosed or high-power environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; required for under-hood and ADAS applications. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during reverse surge events. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 33 V supply rail or sensor output); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV) surges without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during clamping, reducing risk of damage to 3.3 V or 5 V logic interfaces. |
| Glass-passivated junction | Ensures stable VBR and low leakage over time and temperature; eliminates risk of moisture-induced parameter drift. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without pre-baking; compatible with automated pick-and-place and reflow processes. |
| AEC-Q101 qualified (HM3 suffix) | Validates long-term reliability in automotive environments including thermal shock, humidity, and vibration stress. |
Applications
| Automotive Power Distribution | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 33 V battery-supplied control modules (e.g., body control units) from load-dump and alternator ripple transients. IC Role / Device Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp positive-going surges. Use Value: Clamps to 53.9 V within nanoseconds, preventing latch-up or gate oxide rupture in protected PMICs and microcontrollers. |
Use Scenario: Safeguarding analog input channels of PLC analog I/O cards connected to 4–20 mA current loops near AC contactors. IC Role / Device Role: Standoff-rated TVS on signal line to suppress inductive kickback from solenoid switching. Use Value: Withstands 28 A peak pulses while maintaining <1 μA leakage at 33.3 V, preserving measurement accuracy during normal operation. |
| Automotive Sensor Signal Lines | Telecom DC Power Feeds |
Use Scenario: Shielding LIN bus or analog sensor outputs (e.g., pressure sensors) from ESD and coupled transients in engine bay harnesses. IC Role / Device Role: Low-capacitance unidirectional TVS on signal line referenced to local ground. Use Value: Fast avalanche response (<1 ns) limits transient propagation into sensitive ADC front-ends without distorting low-speed signals. |
Use Scenario: Protecting 48 V DC power inputs of remote radio units (RRUs) against lightning-induced surges on outdoor feeder cables. IC Role / Device Role: Primary-level TVS on DC input stage upstream of DC/DC converter. Use Value: 1500 W rating allows single-device protection without cascaded stages, simplifying layout and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), higher VC (53.3 V at 7.5 A), SMA package (smaller thermal mass) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy threats like ESD or localized switching noise | Select only if system-level threat analysis confirms ≤400 W surge exposure and space constraints prohibit SMC. |
| SMCJ33A-QH | Same SMC package and 1500 W rating, but AEC-Q101 qualified with QH suffix; VBR range 37.1–41.0 V identical | Identical electrical performance; differs only in traceability documentation and test report depth for automotive PPAP | Prefer SM15T39AHM3_A/H for new designs requiring halogen-free compliance; choose SMCJ33A-QH where legacy QH sourcing is mandated. |
Compared with SMAJ33A-E3/57T and SMCJ33A-QH, the SM15T39AHM3_A/H delivers identical clamping and AEC-Q101 validation while adding halogen-free material compliance-critical for Tier 1 automotive supply chains with strict substance restrictions.
Availability
SM15T39AHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive I/O protection, and telecom DC power feed applications requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SM15T39AHM3_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 reliability and application-specific performance.
The SM15T Series was engineered for high-energy transient suppression in harsh environments-specifically targeting automotive, industrial, and telecom systems where 1500 W surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SM15T39AHM3_A/H at its rated peak pulse current?
The SM15T39AHM3_A/H has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at 28.0 A peak pulse current (IPPM). This value is measured under standardized test conditions per JEDEC and is guaranteed across the full operating temperature range. The clamping voltage directly determines the maximum overvoltage stress imposed on downstream components during surge events, making it a critical parameter for system-level protection design. SM15T39AHM3_A/H maintains this specification with no derating up to +125 °C ambient.
Is SM15T39AHM3_A/H suitable for automotive applications?
Yes, SM15T39AHM3_A/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials-meeting Tier 1 automotive supply chain requirements. Its qualification covers temperature cycling, highly accelerated life testing (HALT), and ESD robustness per ISO 10605. The device is explicitly recommended for protecting battery rails, sensor interfaces, and LIN/CAN power domains in engine control units and body electronics. SM15T39AHM3_A/H carries the HM3 suffix, which denotes both halogen-free composition and AEC-Q101 compliance.
How does the SM15T39AHM3_A/H differ from the SM15T39A-E3/57T variant?
The SM15T39AHM3_A/H differs from SM15T39A-E3/57T in three key aspects: it uses halogen-free molding compound (vs. standard RoHS), carries AEC-Q101 qualification (vs. commercial grade only), and ships in 7" tape-and-reel with H packaging code (vs. E3's 57T). Electrically, both share identical VWM, VBR, VC, and PPPM ratings. SM15T39AHM3_A/H is intended for automotive and high-reliability industrial use, whereas SM15T39A-E3/57T targets cost-sensitive commercial applications where halogen content and automotive qualification are not required.
What is the thermal resistance of SM15T39AHM3_A/H, and how does it affect PCB layout?
The SM15T39AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, per JEDEC standards. This value assumes minimum recommended pad layout; reducing pad area increases RθJA and risks thermal runaway during repeated surges. For reliable operation at elevated ambient temperatures, designers must allocate sufficient copper area and consider airflow or nearby heat sources. SM15T39AHM3_A/H does not require a heatsink for single-event surge handling but benefits from thermal relief in high-duty-cycle applications.
Does SM15T39AHM3_A/H have polarity marking, and how is it identified?
Yes, SM15T39AHM3_A/H is a unidirectional TVS diode with explicit polarity marking: a molded cathode band on the case identifies the cathode terminal. The anode is the opposite end, unmarked. Correct orientation is essential-reverse installation renders the device ineffective for positive-going transients and may cause catastrophic failure under normal bias. The cathode must connect to the line being protected (e.g., 33 V rail), while the anode connects to ground. SM15T39AHM3_A/H's polarity is confirmed in Vishay's mechanical drawings and ordering information tables.
SM15T39AHM3_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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SM15T39AHM3_A/H FAQ
1.How can I place an order for SM15T39AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39AHM3_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 SM15T39AHM3_A/H reliable?
The price and inventory of SM15T39AHM3_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 SM15T39AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM15T39AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39AHM3_A/H?
SM15T39AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39AHM3_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 SM15T39AHM3_A/H?
For technical support, including SM15T39AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39AHM3_A/H requirements.
6.How does Aetrix verify that SM15T39AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T39AHM3_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 SM15T39AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM15T39AHM3_A/H?
All SM15T39AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39AHM3_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 SM15T39AHM3_A/H part is unused and in its original packaging.
Return procedure for SM15T39AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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