My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T39CAHE3/9AT
- Part No.:
- SM15T39CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CAHE3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T39CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) in SMC (DO-214AB) package, designed for high-energy surge protection on signal and power lines. It features 39 V standoff voltage (VWM), 43.9 V minimum breakdown voltage (VBR), 1500 W peak pulse power (10/1000 μs), and clamps to ≤69.7 V at 143 A peak pulse current - used to protect automotive sensor interfaces, industrial I/O ports, and telecom line drivers against lightning-induced transients.
For engineers reviewing the SM15T39CAHE3/9AT datasheet, SM15T39CAHE3/9AT pinout, SM15T39CAHE3/9AT application, or SM15T39CAHE3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low clamping ratio (VC/VBR ≈ 1.6), and compatibility with automated SMT assembly on standard SMC footprints.
Technical Context
The SM15T39CAHE3/9AT operates as a bidirectional avalanche diode, symmetrically clamping voltage surges above ±43.9 V in either polarity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 μA at 33.3 V), while its low-inductance SMC package supports fast response to sub-microsecond transients.
Thermal design relies on RθJL = 15 °C/W to leads and RθJA = 75 °C/W to ambient (on 8 mm × 8 mm copper pads). The device fails short-circuit under overstress and is rated for continuous operation from –65 °C to +150 °C junction temperature, with MSL Level 1 moisture sensitivity and 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum reverse working voltage before clamping begins; defines safe operating range for protected circuitry. |
| VBR (min) | 43.9 V - guaranteed avalanche onset voltage at 1 mA test current; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 69.7 V at 143 A (10/1000 μs) - clamping voltage limiting stress on downstream components during worst-case surge. |
| PPPM | 1500 W - peak pulse power handling capacity; enables protection against lightning-induced surges per IEC 61000-4-5. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - surface-mount package with 7.75 mm × 6.22 mm footprint; compatible with standard SMT pick-and-place and reflow processes. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
SM15T39CAHE3/9AT uses the SMC (DO-214AB) package - a molded plastic case with two coplanar matte tin-plated leads, no polarity marking (bidirectional), and MSL Level 1 rating. Mounting requires 8.0 mm × 8.0 mm copper pads per terminal per Vishay's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive surges and anode during negative surges; symmetrical conduction enables dual-polarity clamping. |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in CA-suffix devices; no functional distinction - both terminals serve as interchangeable surge shunt nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 1500 W clamping | Protects AC-coupled or floating signal lines without polarity constraints - e.g., RS-485, CAN FD, or sensor bridges. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring long-term reliability. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; reduces parameter drift vs. epoxy-passivated alternatives. |
| Low clamping ratio (VC/VBR ≈ 1.6) | Minimizes voltage overshoot during surge events - critical for protecting 3.3 V or 5 V logic-level ICs downstream. |
| MSL Level 1, 260 °C reflow | Enables single-pass lead-free reflow without baking or special handling - reduces manufacturing complexity and cost. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤69.7 V during 143 A surges, preventing latch-up or gate oxide damage in downstream 5 V tolerant receivers. |
Use Scenario: Safeguarding 24 V digital input modules in PLCs against inductive kickback from solenoid switching. IC Role / Device Role / Timing Role: Primary surge suppression element across input terminals prior to optocoupler isolation stage. Use Value: Absorbs 1500 W energy within 1 ms, maintaining system uptime by avoiding false triggering or component failure during factory automation cycles. |
| Telecom Line Driver Protection | Consumer USB Interface Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul links from lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Common-mode TVS connected between differential pair and ground, leveraging bidirectional symmetry. Use Value: Clamps both polarities equally with <1 μA leakage at 33.3 V, preserving signal integrity and minimizing standby power loss. |
Use Scenario: Adding secondary surge margin to USB 2.0 data lines in smart home hubs subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 143 pF at 0 V) placed inline with D+/D− traces near connector. Use Value: Maintains USB signal rise/fall times while suppressing >8 kV contact ESD per IEC 61000-4-2, without violating eye diagram compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA-E3/52 | Lower PPPM (600 W), same VWM (33.3 V), SMB package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer designs with lower surge threat levels (IEC 61000-4-4 only) | Select when board area is limited and peak surge current does not exceed 64 A; verify thermal margin with smaller pad layout. |
| 1.5KE39CA | Higher VWM (33.3 V), same VBR/VC, axial-leaded DO-201 package, 1500 W rating, no AEC-Q101 qualification | Used in legacy industrial power supplies where through-hole assembly remains standard | Choose for cost-sensitive, non-automotive applications where automated SMT is not required and board-level vibration is minimal. |
Compared with SMBJ39CA-E3/52 and 1.5KE39CA, the SM15T39CAHE3/9AT delivers AEC-Q101 qualification, SMC package compatibility with high-volume SMT lines, and identical 1500 W surge rating - making it the preferred choice for new automotive and industrial designs requiring production scalability and long-term supply assurance.
Availability
SM15T39CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial programmable logic controllers, and telecom line driver circuits requiring stable component supply, AEC-Q101 compliance, and 1500 W transient immunity.
Supply support for SM15T39CAHE3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM15T Series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against lightning, inductive switching, and ESD is mission-critical.
FAQ
What is the clamping voltage of SM15T39CAHE3/9AT at its rated peak pulse current?
The SM15T39CAHE3/9AT clamps to a maximum of 69.7 V at 143 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The clamping performance is consistent across both polarities due to its bidirectional construction.
Is SM15T39CAHE3/9AT suitable for automotive applications?
Yes, SM15T39CAHE3/9AT is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in Vishay's ordering information and mechanical data tables. It meets automotive reliability requirements including temperature cycling, high-temperature reverse bias, and ESD testing - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where sustained operation up to +150 °C is required.
What does the "CA" suffix mean in SM15T39CAHE3/9AT?
The "CA" suffix in SM15T39CAHE3/9AT explicitly denotes a bidirectional configuration. Unlike unidirectional variants (e.g., SM15T39A), this device provides symmetrical clamping for both positive and negative transients without polarity dependence. Vishay specifies that electrical characteristics apply identically in both directions, enabling use on floating or AC-coupled signal paths such as RS-485 or bridge sensor outputs.
What is the standoff voltage (VWM) and why is it important for SM15T39CAHE3/9AT?
The standoff voltage (VWM) of SM15T39CAHE3/9AT is 33.3 V - the maximum continuous reverse voltage the device can block without entering avalanche conduction. This parameter ensures normal circuit operation below 33.3 V while allowing rapid clamping above ~43.9 V (VBR min). Selecting VWM ≥10–20% above the system's maximum operating voltage prevents nuisance conduction and leakage-related power loss.
Does SM15T39CAHE3/9AT require special PCB layout considerations?
Yes, optimal performance of SM15T39CAHE3/9AT requires mounting on 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay document 88380. Smaller pads increase thermal resistance and reduce surge current handling. Additionally, minimize trace length between the TVS and protected node to reduce inductance - critical for achieving the specified 69.7 V clamping voltage during fast-rising transients.
SM15T39CAHE3/9AT 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:
- -
- Bidirectional Channels:
- 1
- 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)
SM15T39CAHE3/9AT FAQ
1.How can I place an order for SM15T39CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CAHE3/9AT 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 SM15T39CAHE3/9AT reliable?
The price and inventory of SM15T39CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T39CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CAHE3/9AT?
SM15T39CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CAHE3/9AT 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 SM15T39CAHE3/9AT?
For technical support, including SM15T39CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CAHE3/9AT requirements.
6.How does Aetrix verify that SM15T39CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T39CAHE3/9AT 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 SM15T39CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T39CAHE3/9AT?
All SM15T39CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CAHE3/9AT, 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 SM15T39CAHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T39CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CAHE3/9AT 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 …
