My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T39AHE3/9AT
- Part No.:
- SM15T39AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39AHE3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,365
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T39AHE3/9AT 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), 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR), and 53.9 V clamping voltage at 28.0 A peak pulse current - used to protect automotive-grade sensor signal lines and MOSFET gate drivers against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T39AHE3/9AT datasheet, SM15T39AHE3/9AT pinout, SM15T39AHE3/9AT application, or SM15T39AHE3/9AT equivalent, key selection criteria include verified AEC-Q101 qualification, unidirectional polarity with cathode band marking, 150 °C max junction temperature, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, triggering when transient voltage exceeds its 33.3 V stand-off threshold and limiting downstream voltage to ≤53.9 V at 28.0 A. Its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress.
The device exhibits low dynamic impedance and low inductance due to its planar SMC package geometry and optimized chip metallization, enabling fast response (<1 ns) to ESD and surge events while maintaining <1.0 μA leakage at VWM. Thermal resistance is 75 °C/W (junction-to-ambient) on standard PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR @ IT=1.0 mA | 37.1–41.0 V - measured breakdown voltage tolerance band; ensures consistent turn-on across production lots. |
| VC @ IPPM=28.0 A | 53.9 V - clamped voltage during 10/1000 μs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 1500 W - peak pulse power rating; supports protection against IEC 61000-4-5 Level 4 (4 kV) surges with proper source impedance. |
| IFSM | 200 A - 10 ms half-sine forward surge rating; enables robust handling of accidental DC overvoltage or battery-reverse scenarios. |
| TJmax | 150 °C - maximum junction temperature; allows operation in under-hood automotive environments with derating above 25 °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 J-STD-020 MSL level 1 reflow. |
Pinout & Package
SM15T39AHE3/9AT uses a 2-terminal SMC (DO-214AB) package. The cathode is marked by a visible band on the body; the anode is the unmarked end. Terminals are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VLINE > VBR. |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces; supports 15-year reliability requirements. |
| Glass passivated junction | Eliminates moisture sensitivity and enhances long-term stability of VBR and leakage performance across temperature and humidity cycles. |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., ESD); critical for protecting high-speed digital interfaces and analog front-ends. |
| 1500 W peak pulse capability | Enables single-device protection against severe threats including ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 combination wave surges. |
| MSL level 1 rating | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking; simplifies manufacturing integration. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
|
Use Scenario: Protecting LIN bus and analog output lines of temperature/pressure sensors mounted near engines or motors. IC Role / Device Role / Timing Role: Clamping transient overvoltage induced by load switching or alternator ripple before it reaches sensor ASIC or microcontroller ADC input. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface circuits while maintaining signal integrity below 53.9 V clamp level. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring exposed to relay coil back-EMF. IC Role / Device Role / Timing Role: Acting as primary surge suppression element across input terminals to absorb 1500 W pulses without degradation. Use Value: Extends module MTBF by eliminating repeated TVS failure modes caused by industrial switching noise and ground bounce. |
| Automotive Powertrain ECUs | Telecom Power Supply Inputs |
|
Use Scenario: Guarding 12 V supply rails feeding fuel injector drivers and ignition coil controllers in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Providing secondary overvoltage protection downstream of main fuse and upstream of LDO regulators. Use Value: Withstands 200 A non-repetitive forward surge (IFSM), enabling survival during battery reverse connection or jump-start events. |
Use Scenario: Shielding AC-DC adapter inputs and PoE-powered equipment from lightning-induced surges entering via Ethernet or mains lines. IC Role / Device Role / Timing Role: Serving as first-line transient suppressor in series with MOV-based primary protection stages. Use Value: Delivers precise clamping at 53.9 V with minimal capacitance, avoiding signal distortion on high-frequency data lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), VC = 53.3 V @ 7.5 A | Not AEC-Q101 qualified; suitable only for commercial-grade consumer/industrial use | Select when cost and board space are prioritized over automotive qualification and higher surge capacity. |
| SMCJ33A-H | Same SMC package, 1500 W rating, but VWM = 33.0 V, VC = 53.3 V @ 28.3 A; AEC-Q101 option available as SMCJ33AHE3 | Identical mechanical and electrical envelope; differs only in minor VBR tolerance and thermal resistance (RθJA = 65 °C/W vs. 75 °C/W) | Choose SMCJ33AHE3 if tighter thermal management or marginally lower clamping is required in high-density layouts. |
Compared with SMAJ33A-E3/57T and SMCJ33A-H, SM15T39AHE3/9AT offers identical clamping performance and AEC-Q101 qualification in a proven SMC form factor, with documented 1500 W surge handling validated for automotive under-hood deployment - making it optimal where reliability and standardized qualification outweigh minor thermal resistance trade-offs.
Availability
SM15T39AHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive I/O safeguarding, and telecom power supply input conditioning requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SM15T39AHE3/9AT 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, precision, and automotive-grade qualification.
The SM15T Series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, 1500 W surge capability, and SMC package robustness are mandatory.
FAQ
What is the clamping voltage of SM15T39AHE3/9AT at its rated peak pulse current?
The SM15T39AHE3/9AT 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 guaranteed per Vishay's datasheet Document Number 88380 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T39AHE3/9AT maintains this clamping performance across its specified operating temperature range.
Is SM15T39AHE3/9AT qualified for automotive applications?
Yes, SM15T39AHE3/9AT is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number and confirmed in Vishay's official documentation. It meets the stress test requirements for automotive-grade discrete semiconductors, including temperature cycling, humidity bias, and surge endurance - making it suitable for engine control units, ADAS sensors, and body electronics. The SM15T39AHE3/9AT is explicitly designated for automotive use in Vishay's ordering information and mechanical data tables.
What does the "9AT" suffix mean in SM15T39AHE3/9AT?
The "9AT" suffix denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. This format is optimized for high-volume SMT assembly lines and complies with EIA-481 standards. The "HE3" portion confirms RoHS-compliance and AEC-Q101 qualification, while "9AT" specifies the physical delivery mode - distinct from "57T" (7-inch reel, 850 units) or "H"/"I" variants. SM15T39AHE3/9AT is fully compatible with standard pick-and-place equipment.
How does SM15T39AHE3/9AT differ from bidirectional TVS diodes like SM15T39CA?
SM15T39AHE3/9AT is unidirectional and features a cathode band marking; it conducts surge current only in reverse bias and blocks forward voltage up to its VWM rating. In contrast, SM15T39CA is bidirectional with no polarity marking and symmetrical clamping in both directions. The SM15T39AHE3/9AT is intended for DC-biased lines (e.g., 12 V supply rails), whereas SM15T39CA suits AC-coupled or differential signal paths. Their VBR, VC, and PPPM ratings are otherwise identical.
What is the thermal resistance of SM15T39AHE3/9AT, and how does it affect PCB layout?
The SM15T39AHE3/9AT 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 defined in Vishay's datasheet. This value assumes standard FR-4 PCB construction without internal copper planes. To maintain safe junction temperatures under sustained power dissipation, designers must allocate adequate copper area and avoid excessive trace length between the SM15T39AHE3/9AT and ground planes. Derating applies above 25 °C ambient.
SM15T39AHE3/9AT 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:
- 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 (SMCJ)
SM15T39AHE3/9AT FAQ
1.How can I place an order for SM15T39AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39AHE3/9AT 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 SM15T39AHE3/9AT reliable?
The price and inventory of SM15T39AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T39AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39AHE3/9AT?
SM15T39AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39AHE3/9AT 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 SM15T39AHE3/9AT?
For technical support, including SM15T39AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39AHE3/9AT requirements.
6.How does Aetrix verify that SM15T39AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T39AHE3/9AT 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 SM15T39AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T39AHE3/9AT?
All SM15T39AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39AHE3/9AT, 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 SM15T39AHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T39AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39AHE3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
