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Taiwan Semiconductor Corporation SMAJ43C
- Part No.:
- SMAJ43C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43C.pdf
- Description:
- 400W, 53.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,752
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Product details
Overview
SMAJ43C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 43V working stand-off voltage (VWM), 47.8–58.4V breakdown voltage (VBR), and 76.7V maximum clamping voltage (VC) at 5.2A peak impulse current. It delivers fast response (<1.0ps), low leakage (<1µA), and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the SMAJ43C datasheet, SMAJ43C pinout, SMAJ43C application, or SMAJ43C equivalent, key selection factors include clamping performance under 10/1000µs surge, unidirectional polarity marking, DO-214AC thermal and mechanical compatibility, and compliance with automotive transients and RoHS/halogen-free requirements.
Technical Context
The SMAJ43C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (47.8–58.4V at 1mA test current). Its glass-passivated junction ensures stable breakdown and low leakage (<1µA at 43V), while the 76.7V clamping voltage at 5.2A limits downstream circuit stress during 400W 10/1000µs surges.
Designed for surface-mount automation, it features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Its -55°C to +150°C operating junction temperature supports under-hood and industrial DC/DC converter environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 47.8 / 58.4 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 76.7 V - Clamps transient energy to ≤76.7 V at 5.2 A, limiting IC stress during surge events |
| PPPM | 400 W - Peak pulse power handling per 10/1000µs waveform, derated above 25°C ambient |
| IR @ VWM | <1 µA - Reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking and 0.060 g mass |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.060 g; UL 94V-0 rated compound; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 43V rail); cathode band marks this terminal on package body |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures consistent VBR tolerance and long-term reliability under repeated surge stress |
| Fast response time <1.0 ps | Clamps ESD and fast transients before sensitive downstream logic or analog circuitry is damaged |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and switching transient immunity without external filtering |
| RoHS and halogen-free | Meets IEC 61249-2-21 and environmental regulations for global automotive and industrial production |
Applications
| Automotive Infotainment Power Rails | Industrial SMPS Input Protection |
|---|---|
Use Scenario: Protecting 43V supply lines feeding head-unit microcontrollers and display drivers against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed at DC input stage, referenced to chassis ground. Use Value: Limits voltage excursion to ≤76.7V during 400W ISO 7637-2 Pulse 5a events, preventing latch-up or gate oxide damage in 48V-tolerant ICs. | Use Scenario: Safeguarding primary-side rectifier outputs in 48V-input industrial switch-mode power supplies. IC Role / Device Role / Timing Role: Standoff protector across bulk capacitor input, absorbing repetitive line surges and lightning-induced spikes. Use Value: Withstands ≥5.2A 10/1000µs impulses while maintaining <1µA leakage at 43V, preserving efficiency and enabling compact filter design. |
| LED Driver Bus Protection | On-Board DC/DC Converter Input |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback and hot-swap transients on 43V bus lines. IC Role / Device Role / Timing Role: Unidirectional transient clamp between LED string anode and system ground. Use Value: Fast <1.0ps response prevents overvoltage exposure during MOSFET switching transitions, extending LED module lifetime. | Use Scenario: Input-side surge suppression for isolated 43V-to-5V/3.3V DC/DC modules in railway control units. IC Role / Device Role / Timing Role: Primary transient limiter ahead of input EMI filter and active rectification stage. Use Value: DO-214AC footprint enables automated placement; 150°C TJ max supports operation in sealed enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Narrower VBR range (47.8–52.8V vs. 47.8–58.4V); same VWM, VC (69.4V), and PPPM | Lower clamping voltage improves margin for 5V-tolerant downstream ICs but reduces robustness against VBR drift at high temperature | Select SMAJ43A when tighter VBR tolerance and lower VC are prioritized over worst-case surge margin |
| P6SMB43CA | Bidirectional variant (CA suffix); identical VWM (43V), VBR (47.8–58.4V), and VC (76.7V), but dual-clamp symmetry | Required only where AC-coupled or bidirectional signal lines need protection; adds unnecessary cost and complexity for DC rail use | Choose SMAJ43C for dedicated unidirectional DC protection; use P6SMB43CA only if bipolar transients or floating references exist |
Compared with SMAJ43A and P6SMB43CA, the SMAJ43C provides optimal balance of clamping voltage, surge margin, and unidirectional simplicity for 43V DC power rails-enabling direct integration without polarity ambiguity or over-specification.
Availability
SMAJ43C is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial SMPS designs, and LED lighting controllers requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ43C 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers for automotive, industrial, and consumer markets.
The SMAJ series was developed specifically for high-reliability transient suppression in harsh-environment DC power systems, emphasizing ISO 7637-2 compliance, automated assembly compatibility, and extended temperature operation.
FAQ
What is the polarity configuration of the SMAJ43C?
The SMAJ43C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package body. It conducts in forward bias and clamps transients only in reverse direction-making it suitable for protecting positive DC rails referenced to ground. This differs from bidirectional variants like SMAJ43CA, which lack polarity marking and clamp symmetrically.
Does the SMAJ43C meet automotive transient standards?
Yes, the SMAJ43C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12V and 24V automotive electrical systems. Its 400W peak pulse power rating, 76.7V clamping voltage at 5.2A, and -55°C to +150°C operating range validate its use in engine control units, body electronics, and infotainment power stages without additional filtering.
What is the maximum clamping voltage of the SMAJ43C under surge conditions?
The SMAJ43C has a maximum clamping voltage (VC) of 76.7V at 5.2A peak impulse current, tested with a 10/1000µs waveform. This value is guaranteed across temperature and lifetime, ensuring downstream components see no more than 76.7V during standardized surge events-critical for safeguarding 80V-rated MOSFETs or 60V-input DC/DC controllers.
How does the SMAJ43C differ from the SMAJ43A variant?
The SMAJ43C has a wider VBR range (47.8–58.4V) versus SMAJ43A (47.8–52.8V), resulting in higher worst-case clamping voltage (76.7V vs. 69.4V). Both share identical VWM (43V), PPPM (400W), and DO-214AC packaging. The SMAJ43C offers greater margin against VBR drift at elevated temperature, while SMAJ43A provides tighter clamping for precision-sensitive loads.
Is the SMAJ43C RoHS and halogen-free compliant?
Yes, the SMAJ43C is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads satisfy J-STD-002 solderability requirements-ensuring compatibility with lead-free reflow processes and environmental compliance for global automotive and industrial shipments.
SMAJ43C 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:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMAJ43C FAQ
1.How can I place an order for SMAJ43C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43C 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 SMAJ43C reliable?
The price and inventory of SMAJ43C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43C is usually 5 days.
3.What payment methods are accepted for SMAJ43C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43C?
SMAJ43C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43C 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 SMAJ43C?
For technical support, including SMAJ43C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43C requirements.
6.How does Aetrix verify that SMAJ43C is sourced from the original manufacturer or authorized distributors?
All SMAJ43C 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 SMAJ43C meets industry standards.
7.What is the process for return or replacement of SMAJ43C?
All SMAJ43C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43C, 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 SMAJ43C part is unused and in its original packaging.
Return procedure for SMAJ43C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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