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Taiwan Semiconductor Corporation SMAJ5.0CA
- Part No.:
- SMAJ5.0CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0CA.pdf
- Description:
- TVS DIODE 5VWM 9.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:13,739
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Product details
Overview
SMAJ5.0CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.3 V breakdown voltage (VBR) at 10 mA, 41.7 V clamping voltage (VC) at 800 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in switching mode power supplies and automotive DC/DC converters.
For engineers reviewing the SMAJ5.0CA datasheet, SMAJ5.0CA pinout, SMAJ5.0CA application, or SMAJ5.0CA equivalent, key selection criteria include bidirectional clamping capability, sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package compatibility, and ≤1 µA reverse leakage above 10 V.
Technical Context
The SMAJ5.0CA operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities due to its CA (bidirectional) suffix. Its fast response (<1.0 ps from 0 V to VBR min) enables suppression of ESD and load-dump transients before sensitive downstream circuitry is damaged.
It is rated for 150 °C maximum junction temperature and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1. The device sustains 40 A non-repetitive forward surge current (IFSM) and maintains <3.5 V forward voltage at 25 A - critical for fault-tolerant power path design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before clamping initiates; sets minimum system rail margin. |
| VBR @ IT=10 mA | 6.4–7.3 V - Breakdown threshold range; ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM=800 A | 41.7 V - Clamped voltage under 10/1000 µs surge; defines worst-case stress on protected ICs. |
| PPPM | 400 W - Peak pulse power handling per standard 10/1000 µs waveform; supports automotive load-dump immunity. |
| IR @ VWM | <5 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss in battery-powered systems. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means band denotes common terminal; no anode/cathode distinction in CA variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Common transient shunt node | Bidirectional conduction path - connects across protected line and ground (or between differential lines); no polarity-sensitive placement required. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; eliminates passivation-related drift in harsh environments. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power-line transient immunity - directly supports 12 V and 24 V vehicle electrical system designs. |
| Sub-1 ps response time | Clamps transients before propagation into IC inputs - essential for protecting high-speed interfaces and microcontroller I/O pins. |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for industrial and automotive end equipment without sacrificing performance. |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against switching-induced voltage spikes and cross-talk. IC Role / Device Role: Transient voltage suppressor placed across input/output rails and ground to clamp inductive kickback and EMI-coupled surges. Use Value: Limits peak rail excursions to ≤41.7 V during 800 A transients, preventing latch-up or oxide breakdown in power management ICs. | Use Scenario: Guarding 5 V or 3.3 V logic rails in engine control units (ECUs) and body control modules (BCMs) against load dump and jump-start surges. IC Role / Device Role: Bidirectional TVS connected between supply and chassis ground to absorb ±100 V/100 ms pulses per ISO 7637-2 Pulse 5a. Use Value: Maintains functional safety by holding protected node voltage below 41.7 V while dissipating up to 400 W - enabling ASIL-B compliant designs. |
| LED Lighting Driver Circuit | Industrial AC/DC Adapter Input Stage |
Use Scenario: Safeguarding constant-current LED driver ICs and MOSFETs from mains-borne surges and lightning-induced transients on low-voltage DC bus lines. IC Role / Device Role: Shunt protector placed across driver output or feedback sense nodes to prevent false triggering and thermal runaway. Use Value: With ≤5 µA leakage at 5.0 V, it avoids loading precision current-sense paths while clamping >1 kV fast transients to safe levels. | Use Scenario: Input-stage surge suppression in universal-input (90–264 VAC) adapters for consumer electronics and IoT gateways. IC Role / Device Role: Secondary-side TVS on DC output (e.g., +12 V, +5 V) to absorb reflected transients from primary-side MOV failure or transformer ringing. Use Value: 400 W rating and DO-214AC footprint allow direct integration into compact adapter PCBs without heatsinking or layout redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Unidirectional; 9.2 V clamping voltage (VC) vs. 9.6 V for SMAJ5.0CA; same VWM/VBR/PPPM ratings. | Requires correct polarity orientation; unsuitable for AC or floating-rail protection where bidirectional clamping is mandatory. | Select SMAJ5.0A only when protecting unidirectional DC rails with known polarity and space-constrained layouts requiring identical footprint. |
| SMBJ5.0CA | Same bidirectional function but in DO-214AA (SMB) package; 600 W peak power rating; higher VC (48.4 V) at 800 A. | Offers higher surge margin but larger footprint and higher clamping voltage - may exceed protected IC's absolute max rating. | Choose SMBJ5.0CA when system-level testing reveals 400 W insufficient; verify PCB pad layout supports SMB outline and clamping headroom remains adequate. |
Compared with SMAJ5.0A and SMBJ5.0CA, the SMAJ5.0CA uniquely balances bidirectional protection, industry-standard SMA footprint, and precise 41.7 V clamping - making it optimal for space-limited, polarity-agnostic DC rail protection where 400 W surge capacity suffices.
Availability
SMAJ5.0CA is available at Aetrix Electronics and suitable for switching mode power supplies, automotive DC/DC converters, and LED lighting drivers requiring stable component supply across extended production cycles and qualification programs.
Supply support for SMAJ5.0CA 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 power management, protection, and signal conditioning devices.
The SMAJ series is part of TSC's transient voltage suppressor product line, engineered specifically for high-reliability industrial and automotive applications demanding ISO 7637-2 compliance, low leakage, and repeatable clamping performance.
FAQ
What does the 'CA' suffix mean in SMAJ5.0CA?
The 'CA' suffix in SMAJ5.0CA indicates a bidirectional configuration - meaning the device provides symmetrical transient suppression in both positive and negative voltage directions. Unlike unidirectional variants (e.g., SMAJ5.0A), SMAJ5.0CA has no polarity marking requirement during PCB placement and is used where AC-coupled signals or floating rails demand equal clamping behavior across both polarities. This is confirmed in TSC's official documentation stating "For bidirectional use C or CA suffix for types SMAJ5.0 – SMAJ188".
What is the maximum clamping voltage of SMAJ5.0CA under surge conditions?
The maximum clamping voltage (VC) of SMAJ5.0CA is 41.7 V when subjected to an 800 A peak impulse current with a 10/1000 µs waveform, as specified in TSC's Electrical Specifications table. This value represents the upper limit of voltage seen by downstream circuitry during worst-case transient events and must be compared against the absolute maximum ratings of protected components to ensure reliability.
Is SMAJ5.0CA compliant with automotive transient standards?
Yes, SMAJ5.0CA meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering typical automotive electrical disturbances including supply voltage dropouts, coupled transients, and capacitive coupling noise. This compliance is explicitly stated in the FEATURES section of the TSC datasheet and validated through standardized test waveforms, confirming its suitability for ECU, infotainment, and ADAS subsystem protection.
What is the junction temperature limit for SMAJ5.0CA?
The SMAJ5.0CA has a maximum operating junction temperature (TJ MAX) of +150 °C and a storage temperature range of −55 °C to +150 °C, as defined in the Absolute Maximum Ratings table. This rating enables reliable operation in under-hood automotive environments and thermally dense industrial power supplies, provided PCB copper area and airflow meet thermal derating guidelines shown in Figure 2 of the TSC datasheet.
Does SMAJ5.0CA require special PCB layout considerations?
Yes - although SMAJ5.0CA uses the standard DO-214AC (SMA) footprint, effective transient suppression requires low-inductance layout: short, wide traces between the device and protected node/ground, minimal loop area, and direct connection to solid ground plane. TSC recommends following their suggested pad layout (Version U2102, Page 6) to maintain specified clamping performance; deviations may increase parasitic inductance and raise effective VC during fast transients.
SMAJ5.0CA 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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)
SMAJ5.0CA FAQ
1.How can I place an order for SMAJ5.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0CA 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 SMAJ5.0CA reliable?
The price and inventory of SMAJ5.0CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0CA is usually 5 days.
3.What payment methods are accepted for SMAJ5.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0CA?
SMAJ5.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0CA 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 SMAJ5.0CA?
For technical support, including SMAJ5.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0CA requirements.
6.How does Aetrix verify that SMAJ5.0CA is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0CA 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 SMAJ5.0CA meets industry standards.
7.What is the process for return or replacement of SMAJ5.0CA?
All SMAJ5.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0CA, 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 SMAJ5.0CA part is unused and in its original packaging.
Return procedure for SMAJ5.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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