My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ40CAHE3_A/I
- Part No.:
- SMAJ40CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,260
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ40CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power 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 6.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ40CAHE3_A/I datasheet, SMAJ40CAHE3_A/I pinout, SMAJ40CAHE3_A/I application, or SMAJ40CAHE3_A/I equivalent, this device is evaluated for ESD/surge immunity in AEC-Q101-qualified systems, PCB-level transient suppression where low clamping voltage and fast response (<1 ns) are critical, and high-reliability replacements for legacy SMAJ40CA variants with RoHS-compliant, halogen-free, and automotive-grade traceability.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients - essential for AC-coupled or floating signal paths. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable breakdown characteristics over temperature (-55 °C to +150 °C).
The device uses a planar silicon avalanche structure optimized for low incremental surge resistance and minimal voltage overshoot under 10/1000 μs surges. Thermal performance is defined by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads), supporting sustained operation at PD = 3.3 W with derating above TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensuring reliable avalanche initiation without premature conduction. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to safe levels per IEC 61000-4-5 Level 3. |
| PPPM | 400 W - Peak pulse power handling capability; supports repetitive surge events at 0.01% duty cycle in automotive environments. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage ensures negligible standby current drain in battery-powered sensor nodes. |
| TJ max. | +150 °C - Junction temperature limit enabling use in under-hood automotive ECUs and industrial motor drives. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard SMT reflow profiles (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (both ends) | Transient current path | Identical bidirectional conduction path; either terminal accepts surge energy regardless of polarity - eliminates orientation errors during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 3.3 V or 5 V logic inputs within safe operating area during lightning-induced transients. |
| Matte tin-plated leads | Ensures solderability per J-STD-002 and JESD 22-B102; supports lead-free reflow while passing JESD 201 Class 2 whisker resistance testing. |
| UL 94 V-0 molding compound | Provides flame-retardant encapsulation required for safety-critical industrial and transportation equipment certifications. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (75 V/200 ms) and IEC 61000-4-5 surges while meeting AEC-Q101 reliability requirements. |
Use Scenario: Safeguarding digital input/output channels on programmable logic controllers against field-wiring induced transients in factory automation systems. IC Role / Device Role / Timing Role: Primary front-end TVS on 24 V DC I/O lines, coordinated with series impedance to limit let-through energy to downstream optocouplers or level shifters. Use Value: Enables >100,000 surge cycles at 400 W without parameter drift, reducing field failure rates in harsh electromagnetic environments. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
|
Use Scenario: Shielding Ethernet PHYs, RS-485 transceivers, and PoE injectors from lightning-induced surges on outdoor cabling in telecom infrastructure. IC Role / Device Role / Timing Role: First-stage protector in multi-tiered architecture - clamps common-mode transients before gas discharge tube or MOV secondary stage. Use Value: Achieves <1 ns response time and 64.5 V clamping to prevent latch-up in 3.3 V/5 V PHY ICs during 10/1000 μs surges up to 4 kV. |
Use Scenario: Adding secondary-level surge immunity to USB-C and barrel-jack power inputs in smart home hubs and portable chargers. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) bidirectional clamp placed after primary fuse and upstream of DC-DC converter input filter. Use Value: Passes IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) ESD testing while maintaining <1 μA leakage at 40 V nominal input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CAHM3_A/I | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | Required where halogen-free compliance is mandated (e.g., EU public transport, medical devices). | Select SMAJ40CAHM3_A/I if halogen-free certification is contractually required; otherwise SMAJ40CAHE3_A/I offers same performance with broader supply chain availability. |
| SMBJ40CAHE3_A/I | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 20 % larger footprint, higher thermal mass, RθJA = 80 °C/W. | Better suited for higher average power dissipation or less dense PCB layouts where space permits. | Choose SMBJ40CAHE3_A/I only when thermal budget exceeds SMAJ40CAHE3_A/I's 3.3 W rating or when board layout accommodates larger package. |
Compared with SMAJ40CAHM3_A/I, SMAJ40CAHE3_A/I provides identical surge performance with standard RoHS compliance; versus SMBJ40CAHE3_A/I, it delivers equivalent protection in 30 % smaller area but requires tighter thermal management due to higher RθJA.
Availability
SMAJ40CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, AEC-Q101 traceability, and long-term production continuity.
Supply support for SMAJ40CAHE3_A/I 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 SMAJ series targets high-speed transient suppression in automotive, industrial, and communications systems - engineered for low clamping voltage, fast response, and qualification to AEC-Q101 and UL standards.
FAQ
What is the clamping voltage of SMAJ40CAHE3_A/I at its rated peak pulse current?
The SMAJ40CAHE3_A/I has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 3.3 V or 5 V ICs. The clamping performance remains stable across -55 °C to +150 °C operating junction temperature.
Is SMAJ40CAHE3_A/I suitable for automotive applications?
Yes, SMAJ40CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix HE3. It passes stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC-Q101 Rev D. Its bidirectional symmetry and 400 W surge rating make it appropriate for CAN bus protection, sensor inputs, and body control module power rails.
How does the bidirectional design of SMAJ40CAHE3_A/I affect PCB layout?
The SMAJ40CAHE3_A/I has no polarity marking and functions identically in either orientation - simplifying automated placement and eliminating risk of reverse installation. Engineers can route it across differential pairs or AC-coupled lines without directional constraints. Its SMA (DO-214AC) footprint requires 0.2" × 0.2" copper pads per terminal for full 400 W rating, per Vishay's recommended layout in document 88390.
What is the maximum reverse leakage current for SMAJ40CAHE3_A/I at its stand-off voltage?
At VWM = 40 V and TA = 25 °C, the SMAJ40CAHE3_A/I exhibits ≤1.0 μA maximum reverse leakage current (ID). This ultra-low leakage preserves battery life in always-on automotive modules and avoids false triggering in high-impedance sensor signal chains. Leakage remains below 5 μA up to TJ = 125 °C per derating curves in the datasheet.
Does SMAJ40CAHE3_A/I meet UL recognition requirements?
Yes, SMAJ40CAHE3_A/I carries Underwriters Laboratory Recognition under file E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for signal line protectors. Its UL 94 V-0 molded case satisfies flammability requirements for end equipment in industrial and transportation markets.
SMAJ40CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ40CAHE3_A/I FAQ
1.How can I place an order for SMAJ40CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAHE3_A/I 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 SMAJ40CAHE3_A/I reliable?
The price and inventory of SMAJ40CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ40CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAHE3_A/I?
SMAJ40CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAHE3_A/I 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 SMAJ40CAHE3_A/I?
For technical support, including SMAJ40CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ40CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAHE3_A/I 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 SMAJ40CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ40CAHE3_A/I?
All SMAJ40CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAHE3_A/I, 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 SMAJ40CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ40CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CAHE3_A/I 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 …
