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Vishay General Semiconductor - Diodes Division SM15T68CA-E3/9AT
- Part No.:
- SM15T68CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T68CA-E3/9AT.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,102
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Product details
Overview
SM15T68CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on signal and power lines. It features 68 V standoff voltage (VWM), 71.4 V minimum breakdown voltage (VBR), 121 V maximum clamping voltage (VC) at 83 A IPPM, and 1500 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, sensor interfaces, and I/O lines in automotive and industrial control systems.
For engineers reviewing the SM15T68CA-E3/9AT datasheet, SM15T68CA-E3/9AT pinout, SM15T68CA-E3/9AT application, or SM15T68CA-E3/9AT equivalent, key selection criteria include bidirectional clamping behavior, low clamping ratio (VC/VBR ≈ 1.70), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SM15T68CA-E3/9AT operates as a symmetrical avalanche diode, conducting equally in both directions above its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1 μA at 58.1 V), while low inductance design minimizes voltage overshoot during fast transients.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = 150 °C. The device fails short-circuit under overstress, meeting AEC-Q101 qualification when ordered with HE3/HM3 suffixes - though SM15T68CA-E3/9AT itself is commercial-grade RoHS-compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 58.1 V - maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 64.6–71.4 V at 1 mA - defines precise conduction onset; tight ±5% tolerance ensures predictable protection timing |
| VC (Clamping Voltage) | 121 V at 83 A (10/1000 μs) - limits transient voltage seen by downstream ICs; clamping ratio VC/VBR ≈ 1.70 |
| PPPM (Peak Pulse Power) | 1500 W - sustains lightning-induced surges per IEC 61000-4-5; validated on 8.0 mm × 8.0 mm copper pads |
| IPP (Peak Pulse Current) | 83 A - maximum non-repetitive surge current it can divert without failure; derated above TA = 25 °C |
| TJ max / TSTG | -65 to +150 °C - wide operating range supports under-hood automotive and industrial ambient conditions |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint; meets UL 94 V-0 flammability |
Pinout & Package
SM15T68CA-E3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional TVS construction. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No functional distinction between terminals; either terminal serves as input/output for transient suppression |
| Case (body) | Non-electrical mechanical interface | DO-214AB molded body provides mechanical stability and thermal path to PCB copper; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 lightning surges without external heat sinking |
| Glass-passivated chip junction | Ensures long-term VBR stability and low leakage drift over temperature and lifetime |
| Low inductance layout | Minimizes voltage overshoot during sub-microsecond transients; critical for high-speed signal line protection |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without popcorn cracking or delamination |
| RoHS-compliant, halogen-free option available | E3 suffix confirms compliance with EU RoHS Directive 2011/65/EU; M3 suffix adds halogen-free certification |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Clamps 121 V at 83 A, limiting stress on 5 V or 3.3 V transceivers; symmetric response avoids polarity concerns in differential buses. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to 24 V DC field wiring carrying motor-switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each channel's input node, coordinated with series current-limiting resistors and filtering capacitors. Use Value: Withstands repeated 1500 W surges without degradation; 58.1 V VWM allows safe operation across full 24 V ±20% supply range. |
| Telecom Line Interface | Consumer Power Adapter ESD/Surge |
Use Scenario: Shielding Ethernet PHY front-end and PoE injectors from induced surges on unshielded twisted-pair cabling in building networks. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection to handle residual fast-rising transients. Use Value: 121 V clamping voltage prevents latch-up in 3.3 V PHY ICs; low capacitance (<100 pF typical) preserves signal integrity up to 100 MHz. |
Use Scenario: Protecting AC-DC adapter secondary-side outputs (5 V/9 V/12 V rails) from ESD events and conducted surges entering via USB or barrel-jack inputs. IC Role / Device Role / Timing Role: Final-stage transient suppressor mounted adjacent to output connector to clamp fast transients before reaching connected devices. Use Value: 1500 W rating handles combination wave surges (1.2/50 μs + 8/20 μs); RoHS-compliant E3 termination ensures compatibility with consumer manufacturing standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/57T | Unidirectional; 64 V VWM; 1000 W PPPM; SMA package (smaller footprint, lower thermal mass) | Limited to DC-biased lines; unsuitable for AC or differential signal paths requiring symmetry | Select when space-constrained and polarity is fixed; verify clamping voltage (93.6 V) meets system margin requirements |
| SMCJ64CA | Bidirectional; same 64 V VWM; 1500 W PPPM; identical SMC package; no RoHS suffix in base P/N | Same functional role but lacks E3 RoHS compliance marking and 13" tape/reel packaging (9AT) | Choose for cost-sensitive industrial designs where RoHS documentation and tape format are not mandatory |
Compared with SM15T68CA-E3/9AT, SMAJ64A-E3/57T offers smaller size but sacrifices bidirectionality and peak power handling, while SMCJ64CA matches electrical performance and package but omits RoHS traceability and preferred reel configuration - making SM15T68CA-E3/9AT optimal for automotive-tier BOMs requiring documented compliance and volume SMT support.
Availability
SM15T68CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full RoHS traceability, and 13-inch tape-and-reel delivery for high-volume SMT production.
Supply support for SM15T68CA-E3/9AT 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, power handling, and automotive qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are critical design requirements.
FAQ
What is the clamping voltage of SM15T68CA-E3/9AT at its rated peak pulse current?
The SM15T68CA-E3/9AT has a maximum clamping voltage (VC) of 121 V when subjected to an 83 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions on 8.0 mm × 8.0 mm copper pads and represents the upper voltage limit imposed on protected circuitry during surge events. The SM15T68CA-E3/9AT maintains this clamping performance across its specified operating temperature range.
Is SM15T68CA-E3/9AT suitable for bidirectional signal line protection?
Yes, SM15T68CA-E3/9AT is explicitly designed as a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping in both polarities, making it ideal for protecting AC-coupled interfaces, differential buses like CAN or RS-485, and any signal path where voltage polarity reversal may occur. Unlike unidirectional variants, SM15T68CA-E3/9AT has no cathode marking and functions identically regardless of terminal orientation.
Does SM15T68CA-E3/9AT meet automotive qualification standards?
The base SM15T68CA-E3/9AT is RoHS-compliant and commercial-grade, not AEC-Q101 qualified. However, Vishay offers AEC-Q101 versions under ordering codes SM15T68CAHE3_A/I (HE3 suffix) and SM15T68CAHM3_A/I (HM3 suffix). These variants undergo additional stress testing for automotive use but share identical electrical specs and SMC package dimensions with SM15T68CA-E3/9AT.
What is the thermal resistance of SM15T68CA-E3/9AT from junction to ambient?
The SM15T68CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes still air conditions and defines the steady-state temperature rise above ambient for a given power dissipation. For higher power handling, PCB copper area or thermal vias should be increased beyond the minimum layout.
How does the SM15T68CA-E3/9AT compare to the SMAJ64A-E3/57T in surge handling capability?
SM15T68CA-E3/9AT delivers 1500 W peak pulse power with a 10/1000 μs waveform, whereas SMAJ64A-E3/57T is rated for 1000 W under the same condition. Additionally, SM15T68CA-E3/9AT is bidirectional and uses the larger SMC package for better thermal dissipation, while SMAJ64A-E3/57T is unidirectional in the smaller SMA package. The SM15T68CA-E3/9AT thus provides superior energy absorption and broader application flexibility than SMAJ64A-E3/57T.
SM15T68CA-E3/9AT 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 16.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T68CA-E3/9AT FAQ
1.How can I place an order for SM15T68CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T68CA-E3/9AT 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 SM15T68CA-E3/9AT reliable?
The price and inventory of SM15T68CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T68CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T68CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T68CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T68CA-E3/9AT?
SM15T68CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T68CA-E3/9AT 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 SM15T68CA-E3/9AT?
For technical support, including SM15T68CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T68CA-E3/9AT requirements.
6.How does Aetrix verify that SM15T68CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T68CA-E3/9AT 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 SM15T68CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T68CA-E3/9AT?
All SM15T68CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T68CA-E3/9AT, 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 SM15T68CA-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T68CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T68CA-E3/9AT Tags
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