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Taiwan Semiconductor Corporation SMAJ8.0CA
- Part No.:
- SMAJ8.0CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0CA.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,112
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Product details
Overview
SMAJ8.0CA from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients on DC power rails and signal lines. It features a 8.0V working stand-off voltage (VWM), 8.89–9.83V breakdown voltage (VBR @ 1mA), and clamps to ≤13.6V at 50A peak impulse current (IPPM) under 10/1000μs waveform - used in automotive DC/DC converters and industrial SMPS input protection.
For engineers reviewing the SMAJ8.0CA datasheet, SMAJ8.0CA pinout, SMAJ8.0CA application, or SMAJ8.0CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1µA @ 8V), and DO-214AC thermal performance up to +150°C junction temperature.
Technical Context
The SMAJ8.0CA implements a glass-passivated silicon avalanche junction optimized for fast transient response (<1.0ps from 0V to VBR min) and stable clamping across temperature. Its bidirectional configuration enables symmetrical protection without polarity constraints, supporting both positive and negative surge events on shared bus lines.
It operates within -55°C to +150°C junction range, with steady-state power dissipation of 1W and peak pulse power rated at 400W (10/1000μs). The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for surface-mount reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system nominal rail (e.g., 9–12V DC bus) |
| VBR @ IT=1mA | 8.89–9.83 V - Measured breakdown threshold defining turn-on consistency; tight tolerance ensures predictable clamping onset |
| VC @ IPPM=50A | ≤13.6 V - Clamped voltage during 10/1000μs surge; limits downstream IC stress to safe levels in 12V systems |
| IPPM | 50 A - Peak surge current handling capacity; supports robust immunity against ISO 7637-2 Pulse 2a (inductive load dump) |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering |
| PPK | 400 W - Peak pulse power rating (10/1000μs); defines transient energy absorption capability per event |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.060g; moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias / negative transient sink | Connects to protected line; bidirectional symmetry means either terminal serves as anode or cathode depending on transient polarity |
| Cathode (banded end) | Current exit point in forward bias / positive transient sink | Band identifies terminal; critical for unidirectional variants but functionally symmetric in SMAJ8.0CA due to bidirectional construction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without polarity concerns - e.g., CAN bus or RS-485 data pairs |
| Fast response time | <1.0 ps rise-to-breakdown ensures suppression initiates before sensitive logic or analog circuitry sustains damage from nanosecond-scale ESD |
| ISO 7637-2 compliance | Validated for Pulse 1 (capacitive coupling), Pulse 2a (load dump), Pulse 3a/3b (switching noise) - required for automotive electronics qualification |
| Low IR at VWM | <1 µA leakage at 8.0V allows use on always-on rails (e.g., battery backup, real-time clock supplies) without measurable drain |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives - supports green manufacturing and end-of-life recycling compliance |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN bus transceivers from load dump and jump-start transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector interface to clamp ±100V transients within 1ns, preventing latch-up or gate oxide rupture in downstream ASICs. Use Value: Maintains system uptime by limiting clamped voltage to 13.6V - well below 16V absolute maximum ratings of typical 12V-rated MCUs and transceivers. |
Use Scenario: Shields primary-side MOSFET gate drivers and controller ICs from reflected surge energy in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Mounted across input bulk capacitor terminals to absorb repetitive 400W pulses from input line switching or lightning-induced surges. Use Value: Enables 100% duty-cycle surge immunity without derating - validated for >1000 cycles at 50A/10/1000μs per JEDEC standards. |
| LED Driver Power Supply | Smart Meter Communication Interface |
Use Scenario: Guards constant-current LED driver ICs against inductive kickback from relay-controlled dimming circuits and mains-borne surges. IC Role / Device Role / Timing Role: Placed between rectified AC input and PFC stage to limit transient overvoltage before it reaches high-voltage gate drivers. Use Value: Prevents premature failure of 600V MOSFETs by clamping spikes to ≤13.6V - reducing stress on bootstrap capacitors and gate oxide layers. |
Use Scenario: Safeguards RS-485 transceivers and microcontroller UART pins in utility smart meters exposed to induced surges on long outdoor communication lines. IC Role / Device Role / Timing Role: Installed differential-mode across A/B bus lines with common-mode chokes to suppress both common- and differential-mode transients. Use Value: Achieves Level 4 IEC 61000-4-5 (4kV line-earth) immunity using only one SMAJ8.0CA per line pair - minimizing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A | Unidirectional; same VWM, VBR, VC, and PPK, but asymmetric conduction - conducts only in reverse direction | Requires explicit polarity alignment; unsuitable for AC or floating differential buses like CAN or RS-485 | Select SMAJ8.0A only when protecting unidirectional DC rails with known polarity and no risk of reverse voltage events |
| SMBJ8.0CA | Same electrical specs but in larger DO-214AA (SMB) package; 600W peak power rating (vs. 400W), higher IPPM = 64.5A | Occupies ~30% more PCB area; better suited for high-energy industrial surge environments where space permits | Choose SMBJ8.0CA when system-level surge testing exceeds 400W or when thermal margin must accommodate repeated pulsing at elevated ambient temperatures |
Compared with SMAJ8.0A and SMBJ8.0CA, the SMAJ8.0CA uniquely balances bidirectional protection, compact DO-214AC footprint, and certified ISO 7637-2 immunity - making it optimal for space-constrained automotive and industrial modules requiring polarity-agnostic surge resilience.
Availability
SMAJ8.0CA is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converter input stages, and smart meter communication interfaces requiring stable component supply and full traceability.
Supply support for SMAJ8.0CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient suppression and industrial-grade surge immunity - emphasizing low clamping voltage, fast response, and robust packaging for high-reliability embedded systems.
FAQ
What is the polarity configuration of the SMAJ8.0CA?
The SMAJ8.0CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without requiring orientation during placement. Its DO-214AC package includes a cathode band for mechanical reference only - unlike unidirectional variants such as SMAJ8.0A, the SMAJ8.0CA conducts identically in either direction once VBR is exceeded. This makes SMAJ8.0CA ideal for protecting AC-coupled signals or floating DC busses where polarity cannot be guaranteed.
Does the SMAJ8.0CA meet automotive surge immunity standards?
Yes, the SMAJ8.0CA meets ISO 7637-2 Pulse 1 (capacitive coupling), Pulse 2a (inductive load dump), and Pulses 3a/3b (switching noise) requirements - confirmed in Taiwan Semiconductor's official documentation. Its 400W peak pulse power rating, 13.6V clamping voltage at 50A, and <1.0ps response time ensure reliable suppression of automotive transients. Note that full AEC-Q101 qualification requires additional testing beyond datasheet specs; confirm qualification status with TSC for safety-critical applications.
How does the SMAJ8.0CA differ from the SMAJ8.0A?
The SMAJ8.0CA is bidirectional while the SMAJ8.0A is unidirectional - a fundamental distinction affecting circuit integration. Both share identical VWM (8.0V), VBR (8.89–9.83V), and VC (≤13.6V), but SMAJ8.0A conducts only when reverse-biased and blocks forward current. SMAJ8.0CA clamps equally in both directions, enabling use on differential buses (e.g., CAN, RS-485) or polarity-unknown inputs. The cathode band on SMAJ8.0CA serves as mechanical alignment aid, not functional polarity indicator.
What is the maximum operating temperature for the SMAJ8.0CA?
The SMAJ8.0CA has a specified junction temperature range of -55°C to +150°C, with thermal derating applied above 25°C ambient per Figure 2 in the datasheet. At 100°C ambient, its peak pulse power drops to approximately 240W (60% of 400W rating). The DO-214AC package's low thermal resistance (RθJA ≈ 120°C/W) supports sustained operation in engine bay or enclosed industrial enclosures when mounted on ≥1 sq-in copper pour.
Can the SMAJ8.0CA be used in place of SMAJ5.0CA for higher-voltage protection?
No - substituting SMAJ8.0CA for SMAJ5.0CA compromises protection integrity. SMAJ5.0CA has VWM = 5.0V and clamps at ≤14.4V, making it suitable for 3.3V/5V logic rails; SMAJ8.0CA's 8.0V VWM and 13.6V clamping voltage are optimized for 12V systems. Using SMAJ8.0CA on a 5V rail risks insufficient margin (only 3V headroom) and potential false triggering from ripple or noise. Always match VWM to system nominal voltage with ≥20% margin.
SMAJ8.0CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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 FAQ
1.How can I place an order for SMAJ8.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0CA 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 reliable?
The price and inventory of SMAJ8.0CA 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 is usually 5 days.
3.What payment methods are accepted for SMAJ8.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0CA?
SMAJ8.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0CA 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?
For technical support, including SMAJ8.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0CA requirements.
6.How does Aetrix verify that SMAJ8.0CA is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0CA 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 meets industry standards.
7.What is the process for return or replacement of SMAJ8.0CA?
All SMAJ8.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0CA, 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 part is unused and in its original packaging.
Return procedure for SMAJ8.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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