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Taiwan Semiconductor Corporation SMAJ43CA
- Part No.:
- SMAJ43CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CA.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,839
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Product details
Overview
SMAJ43CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode in DO-214AC (SMA) package, designed for robust ESD and surge protection in DC power rails. It features a 43 V working stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), 69.4 V maximum clamping voltage (VC) at 5.8 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ43CA datasheet, SMAJ43CA pinout, SMAJ43CA application, or SMAJ43CA equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (CA = bidirectional), moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on SMPS, DC/DC converters, and lighting control boards.
Technical Context
The SMAJ43CA operates as a silicon avalanche diode with glass-passivated junction, enabling sub-1 ps response time from 0 V to VBR min. Its bidirectional construction allows symmetrical clamping in both polarities, eliminating polarity dependency in AC-coupled or floating rail protection schemes.
It meets automotive-grade surge immunity per ISO 7637-2 across all defined pulses (1, 2a, 2b, 3a, 3b) and sustains 150 °C maximum junction temperature. The device is rated for 1 W steady-state power dissipation and supports 40 A non-repetitive forward surge current (IFSM) at 8.3 ms half-sine.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR @ IT=1 mA | 47.8–52.8 V - Measured breakdown range at 1 mA test current; ensures predictable turn-on during transients |
| VC @ IPPM=5.8 A | 69.4 V - Clamped voltage at rated peak impulse current; determines protected circuit's maximum overvoltage exposure |
| PPPM (10/1000 µs) | 400 W - Peak pulse power handling capability; validates compliance with IEC 61000-4-5 Level 4 and ISO 7637-2 |
| IR @ VWM | <1 µA - Reverse leakage at working voltage; minimizes standby power loss in battery-powered systems |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060 g mass; compatible with standard reflow profiles and J-STD-002 solderability |
| Polarity Marking | Cathode band - Identifies terminal orientation for unidirectional variants; SMAJ43CA has no cathode band (bidirectional symmetry) |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, symmetrical bidirectional configuration. Cathode band omitted per bidirectional design; terminals are electrically identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as clamping nodes; no polarity dependence enables use in AC or floating DC lines without orientation constraints |
| Case / Body | Thermal and mechanical interface | Plastic body provides UL 94V-0 flammability rating; matte tin-plated leads ensure reliable solder joint formation per J-STD-002 |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche behavior over 1000+ surge events without parameter drift |
| Sub-1 ps response time | Clamps transients before sensitive downstream ICs experience overstress-critical for protecting USB, CAN, and sensor interfaces |
| ISO 7637-2 compliance | Validated for automotive load dump and inductive switching surges (Pulse 1, 2a, 2b, 3a, 3b) without external filtering |
| MSL 1 rating | Zero floor life limitation; can be stored indefinitely at ≤30 °C/60% RH and mounted without baking or special handling |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU-enables use in green electronics and export-compliant designs |
Applications
| Automotive Infotainment Power Rail | Industrial LED Driver Input Stage |
|---|---|
Use Scenario: Protects 12 V supply input of head unit MCU and audio codec against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed upstream of DC/DC converter; clamps ±100 V transients within 100 ns. Use Value: Maintains VWM = 43 V margin above nominal 12 V rail while limiting VC to 69.4 V-prevents latch-up in 5 V LDOs and digital logic. | Use Scenario: Shields constant-current LED driver IC from switching spikes generated by MOSFET gate drive and inductive ballast. IC Role / Device Role / Timing Role: Primary surge clamp on 24–48 V DC bus; absorbs 400 W pulses without degradation over 10⁵ cycles. Use Value: Leverages 400 W PPPM rating and MSL 1 reliability to eliminate field failures in outdoor-rated luminaires exposed to lightning-induced surges. |
| USB-C PD Adapter Secondary Side | On-Board Telecom DC/DC Converter |
Use Scenario: Safeguards secondary-side synchronous rectifier and controller ICs in 65 W GaN-based USB-C chargers. IC Role / Device Role / Timing Role: Bidirectional clamp across isolated output (20 V), absorbing reflected transients from primary-side switching noise. Use Value: 69.4 V VC ensures <100 mV overshoot on 20 V rail during 10/1000 µs surges-preserves USB PD compliance and prevents VBUS overvoltage shutdown. | Use Scenario: Secures 48 V to 3.3 V point-of-load converter in 5G base station power module against backplane coupling noise. IC Role / Device Role / Timing Role: Input-stage TVS on 48 V bus; handles repetitive 300 W surges per ISO 7637-2 Pulse 3b without derating. Use Value: 43 V VWM provides 5 V margin above 36 V minimum input, while 69.4 V VC protects buck controller's VIN pin from exceeding absolute max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA (Bourns) | Same VWM/VBR/VC specs but SMB package (DO-214AA); 600 W PPPM rating (vs. 400 W) | Higher power handling suits higher-energy surges; larger footprint may limit layout density | Select when system-level surge testing exceeds 400 W or requires extended thermal margin |
| P6SMB43CA (Littelfuse) | Identical electrical specs and DO-214AC package; same 400 W PPPM and 69.4 V VC | Direct form-fit-function replacement; qualified to AEC-Q200 Grade 2 for automotive | Preferred for automotive OEM programs requiring AEC-Q200 qualification and traceable lot history |
Compared with SMBJ43CA and P6SMB43CA, the SMAJ43CA offers optimal balance of compact DO-214AC footprint, ISO 7637-2 compliance, and cost-effective industrial qualification-making it ideal for space-constrained consumer and industrial power supplies where AEC-Q200 is not mandated.
Availability
SMAJ43CA is available at Aetrix Electronics and suitable for switching mode power supplies, onboard DC/DC converters, and lighting applications requiring stable component supply, full MSL 1 handling, and RoHS-compliant sourcing.
Supply support for SMAJ43CA 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, serving global industrial, computing, and automotive markets since 1979.
The SMAJ series is part of TSC's transient voltage suppressor portfolio, engineered specifically for high-reliability board-level surge protection in harsh electromagnetic environments-including automotive subsystems, industrial automation, and telecom infrastructure.
FAQ
What does the 'CA' suffix indicate in SMAJ43CA?
The 'CA' suffix in SMAJ43CA denotes a bidirectional configuration, meaning the device provides symmetrical clamping in both polarities. Unlike unidirectional variants (e.g., SMAJ43A), SMAJ43CA has no cathode marking and functions identically regardless of voltage polarity-ideal for AC lines, floating grounds, or differential signal protection where polarity cannot be guaranteed.
Is SMAJ43CA compliant with automotive surge standards?
Yes, SMAJ43CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a (capacitive discharge), and Pulse 3b (supply line noise). Its 400 W peak pulse power rating and 69.4 V clamping voltage are validated under these waveforms, making it suitable for non-safety-critical automotive infotainment and body electronics.
What is the maximum junction temperature rating for SMAJ43CA?
The SMAJ43CA has a maximum junction temperature (TJ MAX) of +150 °C, as specified in its Absolute Maximum Ratings table. This allows operation in high-ambient environments such as enclosed LED drivers or under-hood automotive modules, provided PCB copper area and airflow meet thermal derating curves shown in Figure 2 of the datasheet.
How does SMAJ43CA differ from SMAJ43A?
SMAJ43A is unidirectional with a cathode band and conducts only in reverse bias; SMAJ43CA is bidirectional with no polarity marking and clamps symmetrically in both directions. Electrically, SMAJ43CA has identical VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V) ratings-but its bidirectional nature eliminates orientation errors during SMT placement and supports AC-coupled protection schemes.
Does SMAJ43CA require special handling due to moisture sensitivity?
No-SMAJ43CA is rated Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking or dry-pack handling prior to reflow. This simplifies manufacturing logistics and reduces risk of popcorning during lead-free soldering.
SMAJ43CA 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- 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)
SMAJ43CA FAQ
1.How can I place an order for SMAJ43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CA 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 SMAJ43CA reliable?
The price and inventory of SMAJ43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CA is usually 5 days.
3.What payment methods are accepted for SMAJ43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CA?
SMAJ43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CA 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 SMAJ43CA?
For technical support, including SMAJ43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CA requirements.
6.How does Aetrix verify that SMAJ43CA is sourced from the original manufacturer or authorized distributors?
All SMAJ43CA 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 SMAJ43CA meets industry standards.
7.What is the process for return or replacement of SMAJ43CA?
All SMAJ43CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CA, 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 SMAJ43CA part is unused and in its original packaging.
Return procedure for SMAJ43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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