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Vishay General Semiconductor - Diodes Division SMAJ8.0CA-E3/5A
- Part No.:
- SMAJ8.0CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CA-E3/5A.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,408
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Product details
Overview
SMAJ8.0CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 8.0 V stand-off voltage (VWM), 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), making it suitable for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ8.0CA-E3/5A datasheet, SMAJ8.0CA-E3/5A pinout, SMAJ8.0CA-E3/5A application, or SMAJ8.0CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.7), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a silicon avalanche diode optimized for fast transient suppression. Its bidirectional structure enables symmetrical clamping in both polarities without external polarity orientation, and its glass-passivated junction ensures stable breakdown characteristics under repetitive surge stress.
The SMAJ8.0CA-E3/5A delivers 13.6 V clamping at 29.4 A (10/1000 μs), with <1 ns response time and low incremental surge resistance - critical for protecting sensitive inputs against ESD, load dump, and inductive switching spikes in 12 V automotive subsystems and industrial I/O interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR min/max | 8.89 V / 9.83 V at 1 mA - Verified breakdown threshold range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage during 400 W transient; limits downstream device stress to safe levels. |
| IPPM | 29.4 A - Peak surge current handling capacity under standardized 10/1000 μs waveform. |
| PPPM | 400 W - Transient energy absorption rating; sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 events. |
| TJ max | +150 °C - Maximum junction temperature enabling reliable operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design; MSL Level 1 compliant. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction between terminals; either side connects to protected line or ground - enables flexible PCB layout without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Supports robust immunity to automotive load-dump and industrial relay-switching transients. |
| 13.6 V clamping at 29.4 A | Clamping ratio of 1.7 ensures minimal overvoltage exposure to downstream 5 V or 3.3 V logic interfaces. |
| MSL Level 1, 260 °C reflow compatible | Eliminates moisture sensitivity concerns and supports standard lead-free SMT assembly processes. |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring validated reliability per JESD22-A108. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver bias lines from load-dump spikes during battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and chassis ground to limit transient voltage excursion. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V MCUs by clamping to 13.6 V within nanoseconds. |
Use Scenario: Shielding 24 V digital input channels from inductive kickback when solenoids or relays de-energize. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side input traces before optocoupler or Schmitt trigger interface. Use Value: Maintains input logic integrity by holding voltage below 15 V during 100 ms, 100 V transients per IEC 61000-4-4. |
| Consumer Appliance Motor Drive Interface | Telecom Equipment Power Sequencing Line |
Use Scenario: Safeguarding MCU analog-to-digital converter (ADC) inputs monitoring motor current sense resistors exposed to PWM noise coupling. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS shunting high-frequency transients to ground before ADC front-end. Use Value: Preserves measurement accuracy by suppressing >1 kV EFT bursts without distorting DC offset or gain calibration. |
Use Scenario: Guarding hot-swap controller enable pins during backplane insertion where supply rail sequencing generates cross-talk spikes. IC Role / Device Role / Timing Role: Fast-response clamp on low-current control lines tied to sequenced 1.8 V/3.3 V rails. Use Value: Avoids false triggering or latch-up in power management ICs by limiting transient duration to <100 ns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A-E3/5A | Unidirectional variant; cathode band marked; forward voltage drop (~3.5 V at 25 A) present in one direction. | Requires correct polarity orientation; unsuitable for AC or floating differential lines. | Select only when protecting unidirectional DC rails where forward conduction must be blocked. |
| SMBJ8.0CA-T | Same VWM/VC specs but in SMB (DO-214AA) package; 50 % larger footprint; 600 W PPPM. | Higher power handling but requires more PCB area; less suitable for dense automotive modules. | Choose when higher surge margin is needed and board space allows larger package. |
Compared with SMAJ8.0A-E3/5A, the bidirectional SMAJ8.0CA-E3/5A eliminates polarity-dependent layout errors and supports AC-coupled interfaces; versus SMBJ8.0CA-T, it trades 200 W peak power for 30 % smaller footprint - ideal for space-constrained 12 V domain controllers.
Availability
SMAJ8.0CA-E3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and consumer appliance motor control systems requiring stable component supply and long-term manufacturing continuity.
Supply support for SMAJ8.0CA-E3/5A 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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, fast response, and repeatable clamping performance are essential.
FAQ
What is the clamping voltage of SMAJ8.0CA-E3/5A at its rated peak pulse current?
The SMAJ8.0CA-E3/5A has a maximum clamping voltage (VC) of 13.6 V at its rated peak pulse current (IPPM) of 29.4 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that downstream circuitry will not experience voltages exceeding 13.6 V during specified transient events, directly supporting robust protection of 5 V and 3.3 V logic interfaces in the SMAJ8.0CA-E3/5A application space.
Is SMAJ8.0CA-E3/5A suitable for automotive applications?
Yes - while the base SMAJ8.0CA-E3/5A is commercial-grade, Vishay offers AEC-Q101 qualified versions under ordering codes SMAJ8.0CAHE3_X (RoHS-compliant, automotive) and SMAJ8.0CAHM3_X (halogen-free, automotive). These variants undergo stress testing per JESD22-A108 and support under-hood deployment where SMAJ8.0CA-E3/5A's +150 °C TJ max and MSL Level 1 reflow compatibility are critical.
How does the bidirectional design of SMAJ8.0CA-E3/5A affect PCB layout?
The SMAJ8.0CA-E3/5A has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation alignment - either terminal may connect to the protected line or ground. This simplifies routing in differential or floating signal paths and eliminates risk of reverse installation, unlike unidirectional variants such as SMAJ8.0A-E3/5A which require strict cathode-band alignment in the SMAJ8.0CA-E3/5A footprint.
What is the thermal resistance of SMAJ8.0CA-E3/5A, and how does it impact power dissipation?
The SMAJ8.0CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. With a 3.3 W steady-state power dissipation rating, this means the device can safely dissipate continuous power only in low-power leakage scenarios; its primary function is transient energy absorption, not sustained power handling - the SMAJ8.0CA-E3/5A relies on short-duration surges rather than DC loading.
Does SMAJ8.0CA-E3/5A meet any industry-standard surge immunity requirements?
Yes - the SMAJ8.0CA-E3/5A's 400 W peak pulse power rating (10/1000 μs) aligns with common surge test standards including ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), and IEC 61000-4-5 Combination Wave (1.2/50 μs voltage, 8/20 μs current) Level 3 (1 kV/0.5 kA). Its 13.6 V clamping ensures protected circuits remain within safe operating limits during these standardized transients, confirming its suitability for SMAJ8.0CA-E3/5A use in certified industrial and automotive designs.
SMAJ8.0CA-E3/5A 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ8.0CA-E3/5A FAQ
1.How can I place an order for SMAJ8.0CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CA-E3/5A 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 SMAJ8.0CA-E3/5A reliable?
The price and inventory of SMAJ8.0CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CA-E3/5A?
SMAJ8.0CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CA-E3/5A 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 SMAJ8.0CA-E3/5A?
For technical support, including SMAJ8.0CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ8.0CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CA-E3/5A 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 SMAJ8.0CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CA-E3/5A?
All SMAJ8.0CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CA-E3/5A, 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 SMAJ8.0CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.0CA-E3/5A Tags
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