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Vishay General Semiconductor - Diodes Division SMCG51CAHE3/9AT
- Part No.:
- SMCG51CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG51CAHE3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,596
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Product details
Overview
SMCG51CAHE3/9AT from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection on signal and power lines. It features a 51 V standoff voltage (VWM), 82.4 V clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform. It is AEC-Q101 qualified and used to protect automotive sensor interfaces against inductive switching transients.
For engineers reviewing the SMCG51CAHE3/9AT datasheet, SMCG51CAHE3/9AT pinout, SMCG51CAHE3/9AT application, or SMCG51CAHE3/9AT equivalent, this device is selected for high-reliability bidirectional surge suppression where low clamping ratio, MSL Level 1 compatibility, and automotive-grade qualification are required - especially in CAN/LIN bus nodes, body control modules, and ADAS sensor supply rails.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 56.7 V and 62.7 V at 1 mA test current. Its low incremental surge resistance enables tight clamping under fast transient events, while its glass-passivated junction ensures stable leakage performance up to 150 °C junction temperature.
The device complies with ANSI/IEEE C62.35 for surge protector characterization and meets UL 497B recognition (QVGQ2). Its thermal resistance (RθJA = 75 °C/W) and RθJL = 15 °C/W support reliable operation on standard 8.0 mm × 8.0 mm copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working range for protected circuitry. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Ensures predictable turn-on threshold with ≤10.6% tolerance; critical for timing-critical protection windows. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream ICs like microcontrollers or transceivers. |
| PPPM | 1500 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance when properly laid out. |
| ID @ VWM | 1.0 µA - Ultra-low leakage at rated standoff; avoids loading of high-impedance sensor bias networks or reference lines. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without derating concerns up to ambient +125 °C. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with 3.17 mm lead pitch; optimized for automated placement and reflow compatibility. |
Pinout & Package
SMCG51CAHE3/9AT uses the SMCG (DO-215AB) surface-mount package: gull-wing leads, matte tin-plated terminals, RoHS-compliant and AEC-Q101 qualified. No polarity marking on bidirectional variants; symmetrical terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency - ideal for AC-coupled or floating lines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements - supports PPAP submission and long-term reliability in vehicle ECUs. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH; compatible with standard SMT reflow profiles up to 260 °C peak without baking. |
| Glass-passivated junction | Stable VBR and ID over temperature and lifetime; eliminates risk of parametric drift due to moisture ingress or contamination. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during surge events - preserves margin for 5 V or 3.3 V logic-level interface ICs downstream. |
| UL 497B recognition (QVGQ2) | Meets safety agency requirements for telecom and industrial signal line protectors - reduces certification burden for end equipment. |
Applications
| Automotive Sensor Interface | CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control units exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching ADC input or signal conditioner. Use Value: Maintains signal integrity by limiting transient voltage to ≤82.4 V while drawing <1 µA leakage at 51 V - preventing offset errors in precision ratiometric sensing. |
Use Scenario: Safeguarding CANH/CANL differential pair against ESD and ISO 7637-2 pulses in body domain ECUs. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) bidirectional TVS placed across differential lines to clamp common-mode surges without distorting data eye. Use Value: Enables >1 Mbps CAN FD operation by avoiding signal rise-time degradation - verified via typical junction capacitance curves in datasheet Fig. 4. |
| Industrial PLC I/O Module | Telecom Line Interface |
|
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Primary front-end protector mounted adjacent to terminal block, coordinated with upstream PTC and downstream optocoupler isolation. Use Value: Withstands repeated 1500 W surges per IEC 61000-4-5; RθJL = 15 °C/W allows direct heat sinking through PCB copper, eliminating need for discrete heatsinks. |
Use Scenario: Protecting RS-485/RS-232 transceiver pins in base station remote units connected to outdoor cabling. IC Role / Device Role / Timing Role: UL 497B-recognized protector installed at board edge to meet telecom safety standards and suppress lightning-induced surges. Use Value: QVGQ2 listing satisfies Underwriters Laboratories requirements for protector classification - accelerates UL certification of full system. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA | Same VWM (51 V) and VC (82.4 V), but SMA (DO-214AC) package; lower PPPM (400 W); no AEC-Q101 qualification. | Limited to commercial/industrial use; unsuitable for automotive under-hood locations due to TJ max = 150 °C not validated per AEC-Q101. | Select SMAJ51CA only for cost-sensitive non-automotive designs where 400 W surge rating suffices and qualification is not required. |
| 1.5KE51CA | Through-hole DO-201 package; higher PPPM (1500 W) but larger footprint; same VWM/VC; no AEC-Q101 or MSL Level 1 rating. | Not suitable for automated SMT assembly; incompatible with high-density layouts; requires wave solder or hand-soldering. | Choose 1.5KE51CA only for legacy through-hole systems or prototyping where reflow compatibility and automotive qualification are irrelevant. |
Compared with SMAJ51CA and 1.5KE51CA, SMCG51CAHE3/9AT uniquely delivers automotive-grade reliability (AEC-Q101), surface-mount scalability (DO-215AB), and full 1500 W surge capability in a single package - making it the only option qualified for production automotive electronics requiring zero rework risk and IPC-compliant assembly.
Availability
SMCG51CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus hardening, industrial I/O conditioning, and telecom line interface applications requiring stable component supply and long-term lifecycle assurance.
Supply support for SMCG51CAHE3/9AT 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 SMCG series was developed specifically for high-power, high-reliability transient suppression in automotive and industrial environments - combining AEC-Q101 qualification, low-profile packaging, and precise clamping performance.
FAQ
What is the clamping voltage of SMCG51CAHE3/9AT at its rated peak pulse current?
The SMCG51CAHE3/9AT has a maximum clamping voltage (VC) of 82.4 V at 18.2 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet Document Number 88457, page 2. The clamping behavior ensures downstream components see limited overvoltage stress during surge events.
Is SMCG51CAHE3/9AT suitable for automotive applications?
Yes, SMCG51CAHE3/9AT is AEC-Q101 qualified and explicitly rated for automotive use per Vishay's documentation. Its construction includes glass-passivated junctions, MSL Level 1 compliance, and operation up to +150 °C junction temperature - meeting requirements for engine control, body electronics, and ADAS subsystems where reliability under thermal and mechanical stress is critical.
Does SMCG51CAHE3/9AT have polarity markings on the package?
No, SMCG51CAHE3/9AT does not feature polarity markings because it is a bidirectional TVS diode. As stated in the Vishay datasheet, "no marking on bidirectional types." Both terminals are functionally identical, enabling symmetrical connection across AC or floating signal paths without orientation constraints during placement.
What is the standoff voltage (VWM) and why is it important for SMCG51CAHE3/9AT?
The standoff voltage (VWM) of SMCG51CAHE3/9AT is 51 V - the maximum continuous reverse voltage the device can withstand without significant conduction. This parameter ensures minimal leakage (<1.0 µA) during normal operation while preserving headroom for transient suppression. It directly determines compatibility with 48 V automotive systems and 24 V industrial buses.
How does the SMCG (DO-215AB) package of SMCG51CAHE3/9AT compare to SMA (DO-214AC) in thermal performance?
The SMCG (DO-215AB) package of SMCG51CAHE3/9AT offers lower thermal resistance than SMA: RθJL = 15 °C/W vs. ~20–25 °C/W for SMA. This improves power dissipation efficiency during repetitive surges. Combined with its larger copper pad requirement (8.0 mm × 8.0 mm), SMCG51CAHE3/9AT sustains higher average power cycling without exceeding TJ max = 150 °C - critical for harsh-environment deployments.
SMCG51CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG51CAHE3/9AT FAQ
1.How can I place an order for SMCG51CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG51CAHE3/9AT 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 SMCG51CAHE3/9AT reliable?
The price and inventory of SMCG51CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG51CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG51CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG51CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG51CAHE3/9AT?
SMCG51CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG51CAHE3/9AT 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 SMCG51CAHE3/9AT?
For technical support, including SMCG51CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG51CAHE3/9AT requirements.
6.How does Aetrix verify that SMCG51CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG51CAHE3/9AT 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 SMCG51CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG51CAHE3/9AT?
All SMCG51CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG51CAHE3/9AT, 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 SMCG51CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG51CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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