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Vishay General Semiconductor - Diodes Division 1.5SMC18CAHE3/57T
- Part No.:
- 1.5SMC18CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CAHE3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,572
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Product details
Overview
1.5SMC18CAHE3/57T 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 18 V breakdown voltage (VBR = 17.1–18.9 V at 1 mA), 15.3 V stand-off voltage (VWM), 25.2 V clamping voltage (VC) at 59.5 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to protect automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the 1.5SMC18CAHE3/57T datasheet, 1.5SMC18CAHE3/57T pinout, 1.5SMC18CAHE3/57T application, or 1.5SMC18CAHE3/57T equivalent, this AEC-Q101 qualified, RoHS-compliant bidirectional TVS delivers verified clamping performance, low incremental surge resistance, and MSL Level 1 moisture sensitivity for surface-mount reliability in harsh environments.
Technical Context
The 1.5SMC18CAHE3/57T operates as a bidirectional voltage-clamping device with symmetrical avalanche breakdown in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1 ns) to transients induced by ESD, lightning, or inductive switching.
Thermally, it supports continuous operation up to +150 °C junction temperature, with RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, allowing robust thermal management in compact PCB layouts. The device meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 17.1–18.9 V at 1 mA test current - defines precise voltage threshold where avalanche conduction begins in both directions |
| Stand-off Voltage VWM | 15.3 V maximum - ensures no conduction during normal 15 V system operation, minimizing leakage |
| Clamping Voltage VC | 25.2 V at 59.5 A IPPM - limits transient voltage seen by downstream ICs to safe levels under 1500 W surge |
| Peak Pulse Power PPPM | 1500 W with 10/1000 µs waveform - sustains high-energy surges common in automotive load-dump and industrial switching events |
| Operating Temperature | −65 °C to +150 °C - supports deployment in under-hood automotive, factory automation, and outdoor telecom equipment |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height, compatible with automated pick-and-place |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Non-polarized terminals | No marking; symmetric structure enables identical clamping behavior regardless of voltage polarity applied across terminals |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded power rails without polarity concerns |
| 1500 W peak pulse power | Withstands high-energy transients from ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge events in automotive ECUs |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, high-temp reverse bias, and mechanical shock per AEC stress test requirements |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage stress on protected devices compared to higher-ratio TVS diodes, improving system-level robustness |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, eliminating bake-out requirements in production |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to vehicle body control modules exposed to ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output line and ground to shunt surge energy before reaching ADC input or op-amp buffer. Use Value: Limits transient voltage to ≤25.2 V during 10/1000 µs surges up to 59.5 A, preventing latch-up or damage to 3.3 V/5 V signal conditioning circuitry. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation PLCs subjected to EFT bursts and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Differential-line TVS mounted across A/B bus lines to clamp common-mode and differential-mode transients simultaneously. Use Value: Maintains signal integrity by clamping bus voltage within ±25.2 V window while preserving DC common-mode range required for RS-485 receiver thresholds. |
| Telecom Power Input | Consumer USB Port Protection |
Use Scenario: Surge suppression on −48 V DC telecom power feeds entering remote radio units, exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to absorb positive/negative polarity surges without polarity-sensitive orientation. Use Value: Handles repetitive 1500 W surges with <1 ns response, limiting rail excursion to 25.2 V and protecting upstream DC/DC converters and monitoring ICs. |
Use Scenario: Overvoltage protection on USB 2.0 D+/D− lines in portable medical monitors, guarding against ESD and hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ < 100 pF at 0 V) placed directly at connector to minimize stub length and preserve signal rise time. Use Value: Clamps ESD events to <25.2 V within nanoseconds while adding <0.3 pF parasitic capacitance per line - negligible impact on 480 Mbps USB 2.0 eye diagram. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Lower peak pulse power (600 W), same VWM/VBR, SMB (DO-214AA) package - 30% smaller footprint but derated thermal performance | Suitable for space-constrained consumer electronics with lower surge threat levels (IEC 61000-4-2 only), not recommended for automotive load-dump | Select when board area is critical and surge energy does not exceed 600 W; verify thermal margin with reduced pad size |
| 1.5KE18CA | Higher VC (29.2 V), same VBR, axial leaded DO-201AE package - lacks SMT compatibility and AEC-Q101 qualification | Used in legacy through-hole designs or prototyping; unsuitable for automated manufacturing or automotive production | Choose only for manual assembly or cost-sensitive non-automotive applications where reflow compatibility and qualification are not required |
Compared with SMBJ18CA and 1.5KE18CA, the 1.5SMC18CAHE3/57T provides superior surge handling (1500 W vs. 600 W/- W), AEC-Q101 validation for automotive use, and SMC package compatibility with high-volume SMT lines - making it the preferred choice for production-grade industrial and automotive transient protection.
Availability
1.5SMC18CAHE3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 networks, telecom power inputs, and consumer USB interface protection requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC18CAHE3/57T 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 1.5SMC Series is engineered for high-power transient suppression in demanding environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching surges is mission-critical.
FAQ
What is the clamping voltage of the 1.5SMC18CAHE3/57T at its rated peak pulse current?
The 1.5SMC18CAHE3/57T has a maximum clamping voltage (VC) of 25.2 V at 59.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions per JEDEC standards and ensures predictable overvoltage limiting during surge events. The 1.5SMC18CAHE3/57T maintains this clamping performance across its full operating temperature range (−65 °C to +150 °C), with minimal drift due to its stable avalanche junction design.
Is the 1.5SMC18CAHE3/57T suitable for automotive applications?
Yes, the 1.5SMC18CAHE3/57T is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HE3", indicating RoHS compliance and qualification to AEC stress tests including temperature cycling, high-temperature reverse bias, and mechanical shock. The 1.5SMC18CAHE3/57T is deployed in engine control units, ADAS sensor modules, and body electronics where protection against ISO 7637-2 load-dump pulses and ESD is required.
What does the "CA" suffix mean in 1.5SMC18CAHE3/57T?
The "CA" suffix in 1.5SMC18CAHE3/57T denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., "A" suffix), the 1.5SMC18CAHE3/57T has no cathode marking and functions identically regardless of polarity applied across its terminals, making it ideal for AC-coupled or differential signal lines such as RS-485 or CAN bus.
What is the maximum operating junction temperature for the 1.5SMC18CAHE3/57T?
The 1.5SMC18CAHE3/57T has a maximum operating junction temperature (TJ) of +150 °C, as specified in its absolute maximum ratings. This allows reliable operation in under-hood automotive environments, industrial motor drives, and outdoor telecom enclosures. Derating curves in the datasheet show that peak pulse power must be reduced above 25 °C ambient, with 50% derating at 125 °C ambient when mounted on recommended 8.0 mm × 8.0 mm copper pads.
How does the 1.5SMC18CAHE3/57T differ from the unidirectional 1.5SMC18AHE3/57T?
The 1.5SMC18CAHE3/57T is bidirectional with symmetrical VBR and clamping in both polarities, while the 1.5SMC18AHE3/57T is unidirectional - conducting only when cathode is more positive than anode, with polarity marking on the package. The 1.5SMC18CAHE3/57T has identical VBR (17.1–18.9 V), VWM (15.3 V), and VC (25.2 V) ratings but supports AC or floating-line protection without orientation constraints, unlike the unidirectional version which requires correct polarity placement.
1.5SMC18CAHE3/57T 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- 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)
1.5SMC18CAHE3/57T FAQ
1.How can I place an order for 1.5SMC18CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CAHE3/57T 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 1.5SMC18CAHE3/57T reliable?
The price and inventory of 1.5SMC18CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18CAHE3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CAHE3/57T?
1.5SMC18CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CAHE3/57T 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 1.5SMC18CAHE3/57T?
For technical support, including 1.5SMC18CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CAHE3/57T requirements.
6.How does Aetrix verify that 1.5SMC18CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CAHE3/57T 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 1.5SMC18CAHE3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CAHE3/57T?
All 1.5SMC18CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CAHE3/57T, 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 1.5SMC18CAHE3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC18CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18CAHE3/57T Tags
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