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Vishay General Semiconductor - Diodes Division 1.5SMC68A-E3/9AT
- Part No.:
- 1.5SMC68A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC68A-E3/9AT.pdf
- Description:
- TVS DIODE 58.1VWM 92VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,135
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Product details
Overview
1.5SMC68A-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 68 V breakdown voltage (VBR = 64.6–71.4 V at IT = 1.0 mA), 58.1 V stand-off voltage (VWM), 92.0 V maximum clamping voltage (VC) at 16.3 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial motor drive control circuits.
For engineers reviewing the 1.5SMC68A-E3/9AT datasheet, 1.5SMC68A-E3/9AT pinout, 1.5SMC68A-E3/9AT application, or 1.5SMC68A-E3/9AT equivalent, key selection considerations include its unidirectional polarity, SMC (DO-214AB) surface-mount package, AEC-Q101 qualification eligibility (via HE3/HM3 variants), low incremental surge resistance, and compliance with UL 497B for telecom and industrial surge protection.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 58.1 V), then rapidly avalanches below 92.0 V to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMC package supports automated placement and meets MSL Level 1 per J-STD-020.
The device is rated for repetitive 10/1000 µs surges at 0.01% duty cycle, derated above TA = 25 °C per Fig. 2, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. It is not intended for continuous forward conduction - only transient suppression - and requires correct cathode orientation (marked band) for unidirectional operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1.0 mA test current - defines precise avalanche onset window for reliable clamping threshold |
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 92.0 V at 16.3 A - clamping voltage during 1500 W transient, limiting stress on protected circuitry |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform, enabling IEC 61000-4-5 Level 4 compliance |
| Junction Temp Range | –65 °C to +150 °C - supports operation in under-hood automotive and industrial ambient environments |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement for thermal performance |
| RoHS Status | RoHS-compliant (E3 suffix), halogen-free option available (M3), AEC-Q101 qualified variants exist (HE3/HM3) |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for reverse-biased protection configuration | Must be connected to the line being protected; clamps to cathode when transient exceeds VWM |
| Anode | Reference/ground return path | Connected to system ground or lower-potential rail; completes shunt path during avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables robust protection against lightning-induced surges and inductive switching transients in 24 V/48 V systems |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during clamping, reducing risk of damage to downstream MOSFETs or microcontrollers |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and low leakage drift across temperature and lifetime |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| UL 497B recognition (QVGQ2) | Validates suitability for telecom line interface protection and industrial Ethernet port surge immunity |
Applications
| Automotive Sensor Interface | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and chassis ground, responding within <1 ns to clamp spikes. Use Value: Maintains signal integrity during 12 V/24 V vehicle electrical disturbances while meeting AEC-Q101 qualification requirements via HE3 variant. |
Use Scenario: Safeguarding gate drivers and feedback sensing circuits in variable-frequency drives exposed to IGBT switching noise and back-EMF transients. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across DC bus rails or isolated signal paths to limit voltage excursions during fault events. Use Value: Prevents false triggering or latch-up in PWM controllers by clamping transients to ≤92.0 V at 16.3 A, compatible with 8.0 mm × 8.0 mm thermal pad layout. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Surge protection on POTS, DSL, or PoE data lines subjected to induced lightning surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level protector upstream of GDT or secondary TVS, absorbing bulk energy before downstream filtering. Use Value: UL 497B recognition confirms compliance for telecom safety standards; bidirectional variants (e.g., 1.5SMC68CA) available for AC-coupled lines. |
Use Scenario: Input-stage overvoltage clamp in AC/DC adapters and USB-C PD power supplies exposed to mains transients. IC Role / Device Role / Timing Role: Standoff-rated suppressor placed after bridge rectifier to protect primary-side controller ICs from line surges. Use Value: 58.1 V VWM allows safe operation across 48 V nominal DC outputs; RoHS-compliant E3 suffix meets global environmental regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | Lower peak power (600 W), smaller SMB (DO-214AA) package, VC = 103 V @ 5.8 A | Less robust for high-energy transients; suitable for space-constrained consumer electronics, not heavy industrial | Select when board area is critical and surge threat level is limited to IEC 61000-4-4 (EFT), not lightning-level IEC 61000-4-5 |
| 1.5KE68A | Through-hole TO-204AE (DO-41) package, same VBR/VC specs, but no SMD automation support | Not suitable for high-volume automated assembly; used in legacy designs or prototyping where rework is acceptable | Choose only for manual assembly, repair scenarios, or compatibility with existing DO-41 footprints - not for new SMT designs |
Compared with SMBJ64A and 1.5KE68A, the 1.5SMC68A-E3/9AT delivers superior surge energy handling in an industry-standard SMD package, enabling automated manufacturing and higher reliability in automotive and industrial environments where 1500 W clamping capability and UL recognition are mandatory.
Availability
1.5SMC68A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive control, telecom line interface, and consumer power adapter input applications requiring stable component supply and full traceability.
Supply support for 1.5SMC68A-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, precision, and application-specific performance.
The 1.5SMC Series was developed for high-power surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, high surge rating, and regulatory compliance are essential.
FAQ
What is the clamping voltage of the 1.5SMC68A-E3/9AT and how does it protect downstream components?
The 1.5SMC68A-E3/9AT has a maximum clamping voltage (VC) of 92.0 V at 16.3 A peak pulse current (10/1000 µs waveform). This means that during a transient event, the device limits the voltage seen by downstream components - such as microcontrollers or MOSFETs - to no more than 92.0 V, preventing overvoltage damage. Its low clamping ratio (VC/VBR ≈ 1.32) ensures minimal overshoot relative to its breakdown threshold, making the 1.5SMC68A-E3/9AT especially effective in protecting sensitive 60 V-rated ICs in 48 V systems.
Is the 1.5SMC68A-E3/9AT RoHS-compliant and what does the "E3" suffix indicate?
Yes, the 1.5SMC68A-E3/9AT is RoHS-compliant. The "E3" suffix denotes Vishay's commercial-grade, lead-free, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. It also satisfies JESD 201 Class 2 whisker resistance testing. This makes the 1.5SMC68A-E3/9AT suitable for environmentally regulated markets including EU, China, and Japan, without requiring exemptions for lead content.
Can the 1.5SMC68A-E3/9AT be used in automotive applications, and if so, what qualifications apply?
The base 1.5SMC68A-E3/9AT is not AEC-Q101 qualified; however, the automotive-grade variant 1.5SMC68AHE3_A/I (with HE3 suffix) is AEC-Q101 qualified and shares identical electrical specs. For automotive use - such as in-body control modules or ADAS sensor interfaces - engineers must specify the HE3 or HM3 version. The 1.5SMC68A-E3/9AT itself is suitable for non-automotive industrial or telecom applications where AEC-Q101 is not mandated.
What is the thermal performance of the 1.5SMC68A-E3/9AT and how should PCB layout accommodate it?
The 1.5SMC68A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To achieve rated power dissipation, Vishay specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Insufficient copper area will cause thermal derating - for example, at 75 °C ambient, the device's 6.5 W steady-state power rating drops significantly without proper heatsinking. The 1.5SMC68A-E3/9AT must be placed with adequate copper pour and avoid nearby heat sources.
How does the 1.5SMC68A-E3/9AT differ from bidirectional TVS diodes like 1.5SMC68CA?
The 1.5SMC68A-E3/9AT is unidirectional and functions only in reverse bias - it conducts during negative transients relative to its cathode. In contrast, 1.5SMC68CA is bidirectional and protects both polarities, making it suitable for AC-coupled lines like telecom or audio. The 1.5SMC68A-E3/9AT offers tighter VBR tolerance (±5%) and lower leakage at VWM, while 1.5SMC68CA exhibits symmetrical clamping in both directions. Selection depends on signal polarity: use 1.5SMC68A-E3/9AT for DC rails with defined ground reference; choose 1.5SMC68CA for floating or AC signals.
1.5SMC68A-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
1.5SMC68A-E3/9AT FAQ
1.How can I place an order for 1.5SMC68A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC68A-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 1.5SMC68A-E3/9AT reliable?
The price and inventory of 1.5SMC68A-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 1.5SMC68A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC68A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC68A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC68A-E3/9AT?
1.5SMC68A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC68A-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 1.5SMC68A-E3/9AT?
For technical support, including 1.5SMC68A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC68A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC68A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC68A-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 1.5SMC68A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC68A-E3/9AT?
All 1.5SMC68A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC68A-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 1.5SMC68A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC68A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC68A-E3/9AT Tags
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