My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCG85A-E3/9AT
- Part No.:
- SMCG85A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG85A-E3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,439
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCG85A-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 10.9 A maximum clamping current (IPPM), and clamps to 137 V at rated surge. It is widely deployed in automotive powertrain control modules to protect CAN transceivers from load dump and inductive switching transients.
For engineers reviewing the SMCG85A-E3/9AT datasheet, SMCG85A-E3/9AT pinout, SMCG85A-E3/9AT application, or SMCG85A-E3/9AT equivalent, key selection criteria include its AEC-Q101 qualification, 1500 W surge rating, DO-215AB thermal performance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCG85A-E3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering fast response (<1 ns) to transient overvoltages. Its clamping behavior follows IEEE C62.35 standards, with defined VBR tolerance (±5%), low incremental surge resistance, and stable performance across -55 °C to +150 °C junction temperature range.
It is rated for non-repetitive 10/1000 µs surge waveforms per Fig. 3, derated above TA = 25 °C per Fig. 2, and mounted on standardized 0.31" × 0.31" copper pads. The device meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Ensures reliable avalanche initiation within tight tolerance band |
| VC @ IPPM | 137 V - Clamping voltage at 10.9 A peak pulse current; defines worst-case protected line voltage |
| PPPM | 1500 W - Peak pulse power handling capability under standard 10/1000 µs waveform |
| ID @ VWM | 1.0 µA - Ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments without derating |
| RθJA | 75 °C/W - Thermal resistance enables 6.5 W power dissipation on infinite heatsink at TA = 50 °C |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing lead frame with matte tin-plated terminals, UL 94 V-0 molding compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to protected line (e.g., CAN_H, 12 V rail); clamps to anode when overvoltage occurs |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Glass passivated chip junction | Ensures long-term reliability and stable VBR under thermal cycling and humidity stress |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
| Automated placement compatible | Gull-wing leads and 0.211 g unit weight support high-yield pick-and-place assembly |
Applications
| Automotive Powertrain ECUs | Industrial Motor Drives |
|---|---|
Use Scenario: Protecting 12 V supply rails and CAN FD signal lines in engine control units exposed to load dump (ISO 16750-2) and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach downstream regulators and transceivers. Use Value: Limits voltage excursion to ≤137 V during 1500 W surges, preserving integrity of 5 V/3.3 V logic supplies and enabling compliance with ISO 16750-2 Test 4a. | Use Scenario: Safeguarding gate drivers and feedback sensors in variable-frequency AC motor drives subjected to IGBT switching spikes and back-EMF transients. IC Role / Device Role / Timing Role: Mounted across DC bus inputs and isolated analog sensor lines to absorb repetitive 10/1000 µs surges up to 10.9 A. Use Value: Maintains <1.0 µA leakage at 85 V, preventing drift in precision current-sense amplifiers while surviving >1000 surge events per MIL-STD-750 Method 2072. |
| Telecom Base Station Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Shielding 48 V intermediate bus converters and PMBus communication lines in 5G remote radio units from lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Bidirectional-capable family variant used in unidirectional configuration to protect primary-side MOSFETs and secondary-side monitoring ICs. Use Value: Delivers 137 V clamping at 10.9 A with RθJL = 15 °C/W, enabling direct thermal coupling to PCB copper for sustained surge duty cycles. | Use Scenario: Securing microcontroller I/O pins and relay coil suppression circuits in smart washing machine main control boards against ESD and relay contact arcing. IC Role / Device Role / Timing Role: Placed across relay coil terminals and MCU GPIO lines to shunt inductive kickback and human-body-model (HBM) ESD pulses. Use Value: Achieves <1 ns response time and 1500 W peak power rating, meeting IEC 61000-4-2 Level 4 (15 kV air) and IEC 61000-4-4 Level 3 (2 kV) immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/57T | Same VWM (85 V) and PPPM (1500 W), but SMA (DO-214AC) package with higher RθJA (100 °C/W) | Limited to lower-duty-cycle surges due to reduced thermal mass; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and thermal performance needs |
| SMCJ85A-E3/9AT | Same DO-215AB package and AEC-Q101 qualification, but higher 3000 W PPPM rating and 170 V VC | Over-spec'd clamping voltage may compromise downstream 12 V logic margin; requires larger board area for same thermal pad layout | Select only when system-level testing confirms 170 V clamping is acceptable and 3000 W surge headroom is required |
Compared with SMAJ85A-E3/57T and SMCJ85A-E3/9AT, the SMCG85A-E3/9AT delivers optimal balance of automotive qualification, thermal efficiency (RθJA = 75 °C/W), and precise 137 V clamping-making it preferred for space-constrained, thermally demanding ECU designs where voltage margin is critical.
Availability
SMCG85A-E3/9AT is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive protection, and telecom base station power supply applications requiring stable component supply, AEC-Q101 compliance, and repeatable 1500 W surge performance.
Supply support for SMCG85A-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, automotive qualification, and high-volume manufacturability.
The SMCG series was engineered specifically for high-energy transient suppression in harsh automotive and industrial environments, combining AEC-Q101 validation, low-profile DO-215AB packaging, and tightly controlled clamping characteristics.
FAQ
What is the clamping voltage of SMCG85A-E3/9AT at its rated peak pulse current?
The SMCG85A-E3/9AT clamps to 137 V at its specified peak pulse current (IPPM) of 10.9 A under the standard 10/1000 µs waveform. This value is measured with the device mounted on 0.31" × 0.31" copper pads per JEDEC test conditions and defines the maximum voltage seen by protected circuitry during a full-rated surge event. The SMCG85A-E3/9AT maintains this clamping performance across its operational temperature range of -55 °C to +150 °C.
Is SMCG85A-E3/9AT qualified for automotive applications?
Yes, the SMCG85A-E3/9AT is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control units, body control modules, and ADAS power supplies. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and surge endurance. The "HE3" and "HM3" variants in the SMCG family explicitly denote AEC-Q101 qualification, and the SMCG85A-E3/9AT shares identical die, construction, and test flow-making its qualification fully applicable. The SMCG85A-E3/9AT is commonly used in under-hood applications where junction temperatures reach +150 °C.
What does the "E3/9AT" suffix indicate in SMCG85A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 22-B102 whisker resistance (Class 2). The "9AT" specifies the packaging format: 13-inch diameter plastic tape and reel containing 3500 units. This differs from "57T", which uses 7-inch reels with 850 units. Both formats use the same SMCG (DO-215AB) package and electrical specifications-the suffix solely identifies environmental compliance and logistics configuration for the SMCG85A-E3/9AT.
How does SMCG85A-E3/9AT compare to SMAJ85A in terms of thermal performance?
The SMCG85A-E3/9AT offers superior thermal performance versus SMAJ85A due to its DO-215AB package geometry and optimized thermal path: RθJA = 75 °C/W (vs. 100 °C/W for SMAJ85A's DO-214AC), and RθJL = 15 °C/W. This allows the SMCG85A-E3/9AT to sustain higher average power dissipation and recover faster between surge events-critical in automotive applications with repetitive transients. The SMCG85A-E3/9AT's lower thermal resistance directly supports its AEC-Q101 qualification and enables use on smaller PCB copper areas without compromising reliability.
Can SMCG85A-E3/9AT be used in bidirectional configurations?
No-SMCG85A-E3/9AT is a unidirectional TVS diode, identified by the "A" suffix (as opposed to "CA" for bidirectional variants like SMCG85CA). Its cathode band marking and asymmetric IV curve require correct polarity orientation: cathode to the protected line, anode to ground. Using it in reverse or attempting bidirectional operation will result in premature failure or no clamping action. For bidirectional protection at 85 V, the designated part is SMCG85CA-E3/9AT, which has symmetrical breakdown in both directions and no polarity marking.
SMCG85A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCG85A-E3/9AT FAQ
1.How can I place an order for SMCG85A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG85A-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 SMCG85A-E3/9AT reliable?
The price and inventory of SMCG85A-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 SMCG85A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG85A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG85A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG85A-E3/9AT?
SMCG85A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG85A-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 SMCG85A-E3/9AT?
For technical support, including SMCG85A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG85A-E3/9AT requirements.
6.How does Aetrix verify that SMCG85A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG85A-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 SMCG85A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG85A-E3/9AT?
All SMCG85A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG85A-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 SMCG85A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG85A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG85A-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 …
