My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCG85CA-E3/9AT
- Part No.:
- SMCG85CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG85CA-E3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,240
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCG85CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 137 V at 10.9 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCG85CA-E3/9AT datasheet, SMCG85CA-E3/9AT pinout, SMCG85CA-E3/9AT application, or SMCG85CA-E3/9AT equivalent, this device is evaluated for ESD/surge protection on bidirectional signal lines, DC power rails, and sensor interfaces where low clamping ratio, fast response (<1 ns), and high surge current capability are critical selection criteria.
Technical Context
The SMCG85CA-E3/9AT operates as a symmetrical, bidirectional avalanche diode with no polarity marking - its terminals are functionally identical and conduct equally in both directions during overvoltage events. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power handling while maintaining a low thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling effective heat dissipation without external heatsinking in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC or AC RMS working range. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - guaranteed breakdown window ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 137 V at 10.9 A - clamping voltage under 10/1000 µs surge; determines maximum voltage seen by protected circuitry. |
| PPPM | 1500 W - peak pulse power rating; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing when properly laid out. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| MSL Level | Level 1 (J-STD-020) - unlimited floor life and reflow compatibility up to 260 °C peak, simplifying SMT manufacturing. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TCT, and ESD testing per AEC specification. |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, gull-wing surface-mount package with matte tin-plated leads, UL 94 V-0 molding compound, and no polarity marking for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Both terminals are electrically identical; connects across protected line and return (e.g., CAN_H–CAN_L or RS-485 A–B). |
| Case / Body | Non-conductive package body | No internal thermal or electrical connection to case; mounting pad layout must follow Vishay-recommended 8.0 mm × 8.0 mm copper area per terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ≈ 1.37) and lower let-through energy during transients compared to higher-Ri TVS devices. |
| Glass-passivated chip junction | Provides stable VBR tolerance, reduced leakage drift over time/temperature, and immunity to moisture-induced degradation. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field reliability. |
| MSL Level 1 compliance | Eliminates bake requirements and allows direct placement into high-volume SMT lines with standard 260 °C reflow profiles. |
| UL 497B recognition (QVGQ2) | Confirms compliance for telecom and industrial signal-line protectors per Underwriters Laboratories safety standards. |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L differential pair in vehicle ECUs against load dump, jump-start spikes, and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly across differential bus lines, responding within <1 ns to divert surge current away from transceiver ICs. Use Value: Maintains signal integrity by clamping to ≤137 V while surviving 1500 W surges - sufficient for ISO 16750-2 Test Pulse 5a (12 V system). | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to motor switching noise and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Symmetrical TVS connected between A and B lines to suppress common-mode and differential-mode transients without affecting DC bias or data eye. Use Value: With 85 V VWM, it remains inactive during normal ±7 V RS-485 signaling but activates decisively above 94.4 V, preventing transceiver latch-up or damage. |
| DC Power Rail Protection | Automotive Sensor Signal Lines |
Use Scenario: Guarding 24 V supply rails in commercial vehicle telematics units against ISO 16750-2 load dump events (up to 35 V for 400 ms). IC Role / Device Role / Timing Role: Placed between VIN and GND to clamp positive-going transients; used with complementary unidirectional device for negative excursions if needed. Use Value: 1500 W rating handles full load dump energy when paired with appropriate series impedance; 137 V clamping prevents downstream regulator overvoltage failure. | Use Scenario: Shielding analog outputs (e.g., 0–5 V throttle position sensor) and LIN bus lines from ESD and inductive kickback in engine compartments. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed at connector entry point to absorb ±8 kV contact ESD (IEC 61000-4-2) and microsecond-scale transients. Use Value: AEC-Q101 qualification and -55 °C to +150 °C operation ensure consistent protection performance across extreme ambient conditions encountered near engines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA | Same VWM (85 V) and PPPM (1500 W), but SMA (DO-214AC) package; 20 % larger footprint and 2× higher RθJA (140 °C/W). | Less suitable for space-constrained automotive modules; requires larger thermal pads for equivalent power handling. | Select SMAJ85CA only if DO-215AB footprint is incompatible and board area permits larger package. |
| TPSMD8.5A | Lower VWM (8.5 V); not interchangeable - designed for 12 V systems, not 24/32 V automotive rails. | Intended for low-voltage logic-level protection (e.g., USB, GPIO), not high-energy power/signal line clamping. | Not a functional substitute; choose only for sub-12 V applications where 85 V standoff is excessive. |
Compared with SMAJ85CA and TPSMD8.5A, the SMCG85CA-E3/9AT offers superior thermal performance in a smaller footprint and is uniquely qualified for automotive under-hood deployment - making it the optimal choice for 24 V+ bidirectional surge protection where space, reliability, and thermal efficiency are prioritized.
Availability
SMCG85CA-E3/9AT is available at Aetrix Electronics and suitable for automotive CAN bus protection, industrial RS-485 interface hardening, and DC power rail surge suppression requiring stable component supply, AEC-Q101 compliance, and high-power transient immunity.
Supply support for SMCG85CA-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, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency, and automotive-grade solutions.
The SMCG series was developed specifically for surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding AEC-Q101 qualification, high surge robustness, and compact packaging.
FAQ
What is the clamping voltage of SMCG85CA-E3/9AT and how is it measured?
The SMCG85CA-E3/9AT has a maximum clamping voltage (VC) of 137 V at 10.9 A, tested with a 10/1000 µs double-exponential surge waveform. This value represents the peak voltage across the device during standardized surge events and is critical for ensuring protected ICs remain below their absolute maximum ratings. The 137 V VC is confirmed in Vishay's datasheet Document Number 88457, page 2.
Is SMCG85CA-E3/9AT suitable for automotive applications?
Yes, SMCG85CA-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its -55 °C to +150 °C operating temperature range, MSL Level 1 reflow compatibility, and UL 497B recognition support deployment in ECUs, body controllers, and sensor modules. Vishay's documentation confirms AEC-Q101 qualification in the Mechanical Data section of the SMCG5.0A–SMCG188CA datasheet.
Does SMCG85CA-E3/9AT have polarity markings?
No, SMCG85CA-E3/9AT is a bidirectional TVS diode and carries no polarity marking on the package. Both terminals are functionally identical, allowing installation across any two points needing symmetrical overvoltage protection - such as differential signal pairs (CAN, RS-485) or power/return lines. This is specified in the "Polarity" note on page 1 of the Vishay datasheet.
What is the thermal resistance of SMCG85CA-E3/9AT and why does it matter?
The SMCG85CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W, measured on Vishay's recommended 8.0 mm × 8.0 mm copper pads. These values determine how effectively heat from surge events dissipates into the PCB - lower RθJA enables higher sustained power handling and improved reliability during repetitive transients.
What packaging option does SMCG85CA-E3/9AT use and what does '9AT' signify?
SMCG85CA-E3/9AT is supplied in a 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. The '9AT' suffix denotes the preferred package code for this delivery format, distinct from '57T' (7-inch reel, 850 units). The 'E3' indicates RoHS-compliant, industrial-grade plating per Vishay's ordering nomenclature in the datasheet's Ordering Information table.
SMCG85CA-E3/9AT 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG85CA-E3/9AT FAQ
1.How can I place an order for SMCG85CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG85CA-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 SMCG85CA-E3/9AT reliable?
The price and inventory of SMCG85CA-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 SMCG85CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG85CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG85CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG85CA-E3/9AT?
SMCG85CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG85CA-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 SMCG85CA-E3/9AT?
For technical support, including SMCG85CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG85CA-E3/9AT requirements.
6.How does Aetrix verify that SMCG85CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG85CA-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 SMCG85CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG85CA-E3/9AT?
All SMCG85CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG85CA-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 SMCG85CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG85CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG85CA-E3/9AT 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 …
