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Taiwan Semiconductor Corporation SMAJ110CA
- Part No.:
- SMAJ110CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110CA.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,294
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Product details
Overview
SMAJ110CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 110 V working stand-off voltage (VWM), 122–149 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤177 V at 1.7 A peak impulse current under 10/1000 µs waveform, delivering 400 W peak pulse power for automotive and industrial SMPS applications.
For engineers reviewing the SMAJ110CA datasheet, SMAJ110CA pinout, SMAJ110CA application, or SMAJ110CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA at 110 V), and DO-214AC surface-mount compatibility with automated placement and J-STD-002 solderability.
Technical Context
The SMAJ110CA is a glass-passivated, single-die, bidirectional TVS diode optimized for fast transient suppression in harsh electrical environments. Its junction structure enables sub-1 ps response time from 0 V to VBR min and supports operation across –55 °C to +150 °C junction temperature range.
It delivers 400 W peak pulse power per 10/1000 µs waveform (derated above 25 °C ambient), with clamping voltage tightly specified at ≤177 V at 1.7 A IPPM - critical for protecting downstream MOSFETs, controllers, and sensing circuitry in on-board DC/DC converters and lighting drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 122 V / 149 V @ 1 mA - ensures reliable turn-on within defined tolerance band |
| VC @ IPPM | ≤177 V @ 1.7 A - limits voltage seen by protected ICs during 10/1000 µs surge |
| PPPM | 400 W (10/1000 µs) - sustains high-energy transients without failure |
| IR @ VWM | <1 µA - negligible leakage current preserves efficiency in high-impedance bias networks |
| TJ max | +150 °C - enables use in under-hood automotive and thermally constrained industrial enclosures |
| Package | DO-214AC (SMA) - industry-standard SMD outline with 0.060 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; two-terminal device with symmetrical bidirectional conduction - no polarity-dependent pin assignment. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Transient current path terminal | Bidirectional conduction - either terminal serves as anode or cathode depending on transient polarity; cathode band indicates conventional unidirectional orientation but does not restrict usage in CA configuration |
| Case / Body | Thermal and mechanical interface | Non-electrical; provides thermal path to PCB copper and mechanical mounting; no internal connection to die |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - essential for automotive ECU and body electronics |
| Fast response time | <1.0 ps from 0 V to VBR min - ensures clamping activation before sensitive logic or gate drivers are exposed to overvoltage |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - allows unlimited floor life and standard reflow without baking |
| Halogen-free construction | Complies with IEC 61249-2-21 - meets environmental and safety requirements for consumer and industrial end equipment |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal cycling and humidity stress |
Applications
| Automotive Body Control Module (BCM) | Industrial LED Driver Power Input |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load dump and inductive switching spikes in 12 V vehicle systems. IC Role / Device Role: Bidirectional clamping element placed directly at connector entry point before input filter stage. Use Value: Withstands 400 W pulses per ISO 7637-2 Pulse 5a while limiting rail voltage to ≤177 V - preventing latch-up or permanent damage to 5 V/3.3 V logic supplies. | Use Scenario: Shields constant-current LED driver ICs from surges induced by AC line transients or nearby relay switching in streetlight fixtures. IC Role / Device Role: Primary overvoltage clamp on 48 V DC bus feeding buck controller and gate drivers. Use Value: Low 1 µA leakage at 110 V stand-off avoids unnecessary standby current draw; DO-214AC footprint enables compact layout adjacent to input capacitors. |
| On-Board DC/DC Converter Input | Switching Mode Power Supply (SMPS) Secondary Side |
Use Scenario: Safeguards isolated DC/DC converter primary-side controller supply against flyback spikes and cross-coupled noise from adjacent high-frequency power stages. IC Role / Device Role: Standoff-rated TVS placed between input rail and ground, upstream of bulk capacitor. Use Value: 122–149 V VBR range ensures precise triggering just above nominal 110 V input, minimizing false clamping during normal regulation. | Use Scenario: Suppresses secondary-side rectifier reverse recovery spikes and transformer leakage in offline AC/DC adapters. IC Role / Device Role: Clamp across output rectifier or across secondary winding to limit voltage overshoot during turn-off. Use Value: 177 V VC rating protects 200 V-rated output capacitors and synchronous rectifier MOSFETs without derating margin loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ110CA (Bourns) | Same VWM (110 V), slightly higher VC (≤187 V @ 1.6 A), 600 W PPPM rating, SMB package (larger footprint) | Higher power handling suits higher-energy surge environments; larger SMB package requires PCB layout change | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 and DO-214AC thermal margin is insufficient |
| P6SMB110CA (Littelfuse) | Identical VWM (110 V), same DO-214AC package, VC = ≤177 V @ 1.7 A, but rated at 600 W PPPM | Same footprint and clamping performance, but higher peak power rating enables longer surge duration tolerance | Choose for designs requiring extended 10/1000 µs surge immunity beyond 400 W baseline, with no PCB revision |
Compared with SMAJ110CA, SMBJ110CA offers higher pulse power (600 W) in a larger SMB package, while P6SMB110CA matches the DO-214AC footprint and clamping voltage but extends pulse energy capacity - both serve as functional alternatives where higher surge margin or identical layout retention is prioritized.
Availability
SMAJ110CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial LED drivers, on-board DC/DC converters, and switching mode power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ110CA 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, MOSFETs, and power management devices for industrial and automotive markets.
The SMAJ series is engineered specifically for high-reliability transient suppression in space-constrained, high-surge environments - emphasizing fast response, low leakage, and AEC-Q200-aligned robustness without requiring external biasing or control.
FAQ
What is the clamping voltage of SMAJ110CA under standard 10/1000 µs surge conditions?
The SMAJ110CA clamps to a maximum of 177 V when subjected to its rated peak impulse current of 1.7 A under the standardized 10/1000 µs waveform. This value is guaranteed across manufacturing lots and temperature range (–55 °C to +150 °C), ensuring consistent protection margin for downstream components such as 200 V-rated electrolytic capacitors or logic-level MOSFETs in the protected circuit. The SMAJ110CA datasheet specifies this as VC@IPPM.
Is SMAJ110CA unidirectional or bidirectional, and how is polarity marked?
SMAJ110CA is a bidirectional TVS diode - it provides symmetrical clamping in both forward and reverse directions, making it suitable for AC-coupled or floating-rail applications. Although it carries a cathode band marking per DO-214AC convention, that marking does not indicate functional polarity; the "CA" suffix explicitly denotes bidirectional configuration. The SMAJ110CA functions identically regardless of orientation on the PCB.
Does SMAJ110CA comply with automotive transient standards like ISO 7637-2?
Yes, SMAJ110CA is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements. Its 400 W peak pulse power rating, fast <1 ps response, and low leakage support robust protection in automotive body control modules, infotainment power supplies, and gateway ECUs - confirmed in Taiwan Semiconductor's U2102 datasheet revision.
What is the maximum junction temperature and thermal derating behavior of SMAJ110CA?
The SMAJ110CA has a maximum junction temperature (TJ max) of +150 °C and follows a linear derating curve above 25 °C ambient, as shown in Figure 2 of the official datasheet. At 85 °C ambient, its peak pulse power drops to approximately 280 W; at 125 °C, it falls to ~160 W. This derating must be applied in thermally dense layouts - the SMAJ110CA's DO-214AC package relies on PCB copper area for heat dissipation.
Can SMAJ110CA replace SMAJ110A in an existing design?
No - SMAJ110CA and SMAJ110A are not interchangeable. SMAJ110A is unidirectional (anode-cathode asymmetric), while SMAJ110CA is bidirectional. Substituting SMAJ110CA for SMAJ110A may cause unintended conduction in DC-biased circuits. Always verify circuit topology: SMAJ110CA is appropriate only where symmetrical transient suppression is required, such as across AC lines or floating buses. The SMAJ110CA datasheet clearly distinguishes CA (bidirectional) from A (unidirectional) variants.
SMAJ110CA 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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
SMAJ110CA FAQ
1.How can I place an order for SMAJ110CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110CA 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 SMAJ110CA reliable?
The price and inventory of SMAJ110CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110CA is usually 5 days.
3.What payment methods are accepted for SMAJ110CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110CA?
SMAJ110CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110CA 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 SMAJ110CA?
For technical support, including SMAJ110CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110CA requirements.
6.How does Aetrix verify that SMAJ110CA is sourced from the original manufacturer or authorized distributors?
All SMAJ110CA 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 SMAJ110CA meets industry standards.
7.What is the process for return or replacement of SMAJ110CA?
All SMAJ110CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110CA, 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 SMAJ110CA part is unused and in its original packaging.
Return procedure for SMAJ110CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ110CA Tags
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