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Diodes Incorporated SMAJ43CA-13
- Part No.:
- SMAJ43CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CA-13.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,583
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Product details
Overview
SMAJ43CA-13 from Diodes Incorporated is a 400W bi-directional transient voltage suppressor (TVS) diode in SMA package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 43V reverse standoff voltage (VRWM), 47.8–52.8V breakdown range (VBR @ 1mA), 69.4V max clamping voltage (VC) at 5.7A peak pulse current (IPP), and operates from –55°C to +150°C - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ43CA-13 datasheet, SMAJ43CA-13 pinout, SMAJ43CA-13 application, or SMAJ43CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, unidirectional/bi-directional polarity requirement, 400W pulse rating under 8.3ms half-sine surge, and RoHS-compliant matte tin termination compatibility with lead-free reflow.
Technical Context
This bi-directional TVS diode uses glass-passivated junction construction to achieve fast response time (<1ps) and stable clamping under repetitive transients. Its symmetrical I-V characteristic enables protection against both positive and negative polarity surges without external polarity management.
Rated for 400W non-repetitive peak pulse power (PPK) at TA = 25°C, it derates linearly above ambient temperature per Fig. 1 and supports steady-state dissipation up to 1.0W at TL = 75°C. The device meets JEDEC-standard 8.3ms half-sine surge testing (IFSM = 40A) and exhibits <5µA reverse leakage at VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPK) | 400W - sustains single 8.3ms surge events without failure in typical board-level ESD/EFT scenarios |
| Reverse Standoff Voltage (VRWM) | 43V - maximum continuous DC voltage before significant leakage; sets upper limit for protected line operating voltage |
| Breakdown Voltage (VBR) | 47.8–52.8V @ 1mA - defines onset of avalanche conduction; ensures reliable triggering above normal operating voltage |
| Clamping Voltage (VC) | 69.4V @ IPP = 5.7A - limits transient voltage seen by downstream ICs; critical for 48V system rail protection |
| Peak Pulse Current (IPP) | 5.7A - maximum surge current the device can shunt while maintaining specified VC; determines survivability under IEC 61000-4-5 Level 3 |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial environments with wide thermal cycling |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with standard pick-and-place and reflow processes; UL 94V-0 rated epoxy |
Pinout & Package
SMA (DO-214AC) package: molded plastic case, cathode band omitted (bi-directional), moisture sensitivity level 1, weight ≈ 0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional avalanche terminals | No polarity distinction; either terminal serves as surge current entry/exit point depending on transient polarity |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable, low-leakage avalanche performance across temperature and lifetime; eliminates passivation-related drift |
| 400W peak pulse rating | Provides margin against IEC 61000-4-5 4kV/2Ω combination wave surges on 24–48V systems |
| RoHS-compliant matte tin plating | Ensures solderability and intermetallic formation control in Pb-free reflow profiles (J-STD-020C Level 1) |
| UL 94V-0 flammability rating | Meets safety requirements for enclosed industrial and automotive enclosures where flame propagation must be suppressed |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24V/48V digital input channels from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed between input terminal and ground, responding within picoseconds to divert surge energy. Use Value: Prevents latch-up or permanent damage to microcontroller GPIOs and level translators by limiting voltage to ≤69.4V during 5.7A surges. |
Use Scenario: Safeguarding LIN bus transceivers and sensor supply lines against battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across VBAT and GND, conducting only during >43V excursions. Use Value: Maintains functional integrity of LIN communication during 12V system transients up to ±400W without requiring polarity-aware layout. |
| Telecom Power Feeds | Renewable Energy Inverter Control |
|
Use Scenario: Shielding 48V PoE-powered equipment front-end regulators from lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter input, absorbing energy before filtering stages. Use Value: Reduces required filter inductance/capacitance by clamping transients to 69.4V, lowering BOM cost and board area. |
Use Scenario: Protecting gate driver supply rails in solar inverter half-bridges from high dv/dt coupling and ground bounce. IC Role / Device Role / Timing Role: Localized clamping element mounted near isolated gate driver ICs to suppress sub-100ns transients. Use Value: Avoids false turn-on of MOSFETs/IGBTs by holding gate-source voltage below threshold during fast-rising noise events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA-13 | Same VRWM/VBR/VC specs but SMB package (larger footprint, 600W PPK rating) | Better suited for higher-energy surges; requires PCB real estate increase and different thermal relief design | Select when system-level surge test levels exceed IEC 61000-4-5 Level 4 (6kV/12Ω) |
| SMCJ43CA-13 | Same electrical specs, SMC package (1500W PPK, higher thermal mass) | Used in main DC input protection stages; not suitable for space-constrained signal-line placement | Choose for primary board-level protection where 1500W clamping headroom and lower thermal resistance are mandatory |
Compared with SMBJ43CA-13 and SMCJ43CA-13, SMAJ43CA-13 offers optimal balance of surge robustness (400W), compact SMA footprint, and cost efficiency for secondary protection zones - ideal where board space is constrained but 4kV-level immunity suffices.
Availability
SMAJ43CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power feeds, and renewable energy inverter control requiring stable component supply and full traceability.
Supply support for SMAJ43CA-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and computing markets.
SMAJ series TVS diodes are part of Diodes' transient suppression portfolio, engineered specifically for surface-mount surge immunity in harsh-environment DC power and data interfaces - emphasizing low clamping voltage, repeatable breakdown, and AEC-Q200 readiness.
FAQ
Is SMAJ43CA-13 unidirectional or bi-directional?
SMAJ43CA-13 is bi-directional, indicated by the "C" suffix in the part number per Diodes Incorporated's ordering convention. It has symmetrical avalanche characteristics and no cathode band marking, enabling protection against both positive and negative polarity transients without polarity-sensitive placement.
What is the maximum clamping voltage at 5.7A peak pulse current?
The maximum clamping voltage (VC) for SMAJ43CA-13 is 69.4V at 5.7A peak pulse current (IPP), measured under the standardized 8.3ms half-sine waveform per JEDEC. This value is guaranteed across temperature and represents the highest voltage imposed on protected circuitry during worst-case surge conditions.
Does SMAJ43CA-13 meet RoHS requirements?
Yes - SMAJ43CA-13 features matte tin plating and complies with RoHS Directive 2011/65/EU (including exemptions for high-temperature solder and glass). It is rated as lead-free finish per J-STD-020C Level 1 and qualified for Pb-free reflow profiles up to 260°C peak temperature.
Can SMAJ43CA-13 replace SMAJ43A-13 in an existing design?
No - SMAJ43A-13 is unidirectional (no "C" suffix) and includes a cathode band for polarity-specific placement. Substituting SMAJ43CA-13 introduces symmetrical conduction that may disrupt circuits relying on DC blocking or polarity-dependent biasing; layout and schematic review are required before replacement.
SMAJ43CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ43CA-13 FAQ
1.How can I place an order for SMAJ43CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CA-13 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-13 reliable?
The price and inventory of SMAJ43CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ43CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CA-13?
SMAJ43CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CA-13 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-13?
For technical support, including SMAJ43CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CA-13 requirements.
6.How does Aetrix verify that SMAJ43CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ43CA-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ43CA-13?
All SMAJ43CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CA-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ43CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43CA-13 Tags
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ESD9B5.0ST5G
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