My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ40AHE3/9AT
- Part No.:
- SMCJ40AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40AHE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,408
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ40AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power rating (10/1000 µs waveform). It is AEC-Q101 qualified and used in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ40AHE3/9AT datasheet, SMCJ40AHE3/9AT pinout, SMCJ40AHE3/9AT application, or SMCJ40AHE3/9AT equivalent, key selection criteria include clamping performance under 23.3 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ40AHE3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to clamp transients. Its glass-passivated junction ensures stable VBR and low leakage (<1 µA at 40 V), while its low incremental surge resistance enables fast response (<1 ns) and minimal voltage overshoot during ESD or load-switching events.
Designed for mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, it delivers rated 1500 W pulse power only under that thermal condition and derates linearly above 25 °C ambient per Fig. 2. The device meets MSL Level 1 (260 °C reflow peak) and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage seen by protected IC during full-rated 10/1000 µs surge; limits stress on downstream components. |
| PPPM | 1500 W - Peak transient energy absorption capability under standardized 10/1000 µs waveform. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; requires adequate PCB copper area for sustained power dissipation. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity marked by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line (e.g., +12 V rail); conducts during overvoltage to shunt current to ground. |
| Anode | Reference/ground return path | Connected to system ground or low-impedance return; completes clamping path during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term leakage stability under thermal cycling and humidity. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS modules requiring zero-failure reliability. |
| Low incremental surge resistance | Minimizes VC rise during high di/dt events, improving clamping precision for sensitive 3.3 V or 5 V logic interfaces. |
| MSL Level 1 rating | Enables single-pass reflow assembly without moisture sensitivity concerns or baking requirements. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/5a surges and IEC 61000-4-5 Combination Wave (10/700 µs) up to specified energy levels. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits peak voltage to ≤64.5 V during 23.3 A transients, preventing damage to 36 V-rated input stages and ensuring system-level EMC compliance. | Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loop drivers) and digital I/O (CAN, LIN) from ESD and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: Point-of-entry protection on sensor interface connectors, mounted directly at connector footprint. Use Value: Sub-1 ns response time and <1 µA leakage at 40 V preserve signal integrity and offset accuracy in precision measurement circuits. |
| DC-DC Converter Input Stage | Telecom Power Supply Front-End |
Use Scenario: Input protection for buck converters in automotive infotainment systems subjected to repeated cold-crank and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitors and controller ICs. Use Value: Withstands repetitive 1500 W pulses without degradation, maintaining clamping performance across >1000 surge events per AEC-Q101 test plan. | Use Scenario: Secondary-side protection on -48 V telecom rectifier outputs exposed to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Bidirectional-capable family member used unidirectionally to clamp negative excursions on grounded-return systems. Use Value: 64.5 V clamping voltage ensures protected DC-DC controllers remain within absolute maximum ratings even during worst-case 2 kV combination wave tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Not suitable for 1500 W surge events; limited to low-energy ESD or board-level transients | Select only when space-constrained and surge energy is ≤400 W; verify thermal margin with reduced pad area. |
| SMCJ40CAHE3/9AT | Bidirectional variant; identical VWM (40 V), VBR (44.4–49.1 V), VC (64.5 V), and PPPM (1500 W) | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485, CAN bus) | Use bidirectional version only when protecting symmetric differential or AC signals; unidirectional SMCJ40AHE3/9AT is optimal for DC rails with defined ground reference. |
Compared with SMAJ40A-E3/61T and SMCJ40CAHE3/9AT, the SMCJ40AHE3/9AT uniquely balances 1500 W surge capacity, AEC-Q101 qualification, and SMC package thermal performance-making it the preferred choice for automotive and industrial DC power line protection where both energy handling and reliability are critical.
Availability
SMCJ40AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and repeatable 1500 W transient suppression performance.
Supply support for SMCJ40AHE3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where clamping precision, surge endurance, and qualification rigor are non-negotiable.
FAQ
What is the clamping voltage of SMCJ40AHE3/9AT at its rated peak pulse current?
The SMCJ40AHE3/9AT has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 23.3 A under the standard 10/1000 µs waveform. This value is measured with the device mounted on 0.31" × 0.31" copper pads per terminal and represents the upper voltage limit imposed on protected circuitry during full-rated surge events. The SMCJ40AHE3/9AT maintains this clamping performance consistently across its qualified temperature range.
Is SMCJ40AHE3/9AT suitable for automotive applications?
Yes, the SMCJ40AHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD-per AEC-Q101 Rev D. Its 1500 W surge rating, +150 °C max junction temperature, and MSL Level 1 reflow compatibility make the SMCJ40AHE3/9AT appropriate for engine control modules, body control units, and ADAS power supplies.
How does the SMCJ40AHE3/9AT differ from the bidirectional SMCJ40CAHE3/9AT?
The SMCJ40AHE3/9AT is unidirectional with cathode-band polarity marking, intended for DC rail protection where current flows in one direction during clamping. The SMCJ40CAHE3/9AT is bidirectional-electrically symmetric-with no polarity marking and identical VWM (40 V), VBR (44.4–49.1 V), and VC (64.5 V) specs. Both share the same SMC package, AEC-Q101 qualification, and 1500 W rating, but the SMCJ40AHE3/9AT must be oriented correctly in-circuit, whereas the SMCJ40CAHE3/9AT can protect AC or floating nodes without orientation concern.
What is the thermal resistance of SMCJ40AHE3/9AT, and how does it affect layout?
The SMCJ40AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Layouts using smaller pads or insufficient copper will increase RθJA, reducing safe power dissipation and risking thermal runaway during repetitive surges. To maintain rated performance, PCB design must allocate minimum copper area per datasheet Fig. 2 and avoid thermal isolation of the SMCJ40AHE3/9AT pads.
Does SMCJ40AHE3/9AT require external series impedance for optimal protection?
No, the SMCJ40AHE3/9AT functions as a standalone shunt protector and does not require external series impedance to meet its rated clamping performance. However, adding a small series resistor or ferrite bead upstream improves filtering of high-frequency ringing and reduces di/dt stress on the SMCJ40AHE3/9AT during very fast transients (e.g., ESD). Such components are application-dependent and do not alter the fundamental 64.5 V clamping specification of the SMCJ40AHE3/9AT itself.
SMCJ40AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- 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 (SMCJ)
SMCJ40AHE3/9AT FAQ
1.How can I place an order for SMCJ40AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40AHE3/9AT 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 SMCJ40AHE3/9AT reliable?
The price and inventory of SMCJ40AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40AHE3/9AT?
SMCJ40AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40AHE3/9AT 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 SMCJ40AHE3/9AT?
For technical support, including SMCJ40AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ40AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40AHE3/9AT 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 SMCJ40AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40AHE3/9AT?
All SMCJ40AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40AHE3/9AT, 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 SMCJ40AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40AHE3/9AT 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 …
