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Taiwan Semiconductor Corporation SMAJ43CAH
- Part No.:
- SMAJ43CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,088
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Product details
Overview
SMAJ43CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection. It features 400W peak pulse power (10/1000μs), 43V working stand-off voltage (VWM), 47.8–52.8V breakdown voltage (VBR), and clamps to ≤69.4V at 5.8A peak impulse current - deployed in on-board DC/DC converters to protect sensitive 42V rail electronics.
For engineers reviewing the SMAJ43CAH datasheet, SMAJ43CAH pinout, SMAJ43CAH application, or SMAJ43CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1, and DO-214AC thermal/power derating behavior above 25°C ambient.
Technical Context
The SMAJ43CAH implements a glass-passivated silicon junction optimized for fast transient suppression with <1.0ps response from 0V to VBR min. Its bidirectional configuration enables symmetrical clamping in both polarities without external polarity management, supporting robust protection in unidirectional or floating signal/power lines.
It operates across –55°C to +150°C junction temperature range, with steady-state power dissipation of 1W and peak forward surge current rating of 40A (8.3ms half-sine). Clamping performance is specified per standardized 10/1000μs waveform, and derating follows Fig.2 for ambient temperatures >25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines system voltage margin for 42V automotive rails. |
| VBR min/max | 47.8 V / 52.8 V @ 1 mA - Verified breakdown threshold ensures reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM | ≤69.4 V @ 5.8 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 2b (load dump) events. |
| PPPM | 400 W (10/1000μs) - Sustains high-energy surges typical of automotive load dump and inductive switching without failure. |
| IR @ VWM | ≤1 µA - Ultra-low leakage preserves battery life in always-on vehicle modules (e.g., body control units). |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power MOSFETs, DC/DC inductors) without thermal derating penalties. |
Pinout & Package
DO-214AC (SMA) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band marking for polarity identification. Bidirectional operation means both terminals are functionally symmetric; no anode/cathode assignment required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Transient current path terminal | Marked end denotes cathode for unidirectional variants; for SMAJ43CAH (bidirectional), either terminal serves as clamping node - no directional routing needed. |
| Unmarked terminal | Transient current path terminal | Electrically identical to marked terminal; bidirectional symmetry allows flexible PCB placement and eliminates orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, mechanical shock, and humidity exposure per JESD22 standards. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive spike), Pulse 2a/2b (load dump), and Pulse 3a/3b (switching noise) requirements for 12V/42V systems. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without dry-pack handling or floor-life restrictions. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal stress and humidity aging. |
| Fast response time | <1.0 ps rise-to-VBR - Captures sub-nanosecond ESD and fast-switching transients before downstream ICs experience overstress. |
Applications
| Automotive Body Control Module (BCM) | 42V On-Board DC/DC Converter |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector interface to shunt transients before entering signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 5V/3.3V logic during ISO 7637-2 Pulse 2b events up to 100V/100ms, maintaining functional safety integrity. |
Use Scenario: Shields synchronous buck controller gate drivers and feedback resistors from switching-induced overshoot in 42V→12V conversion stages. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input rail, triggered within 1ps to limit voltage excursion during MOSFET turn-off spikes. Use Value: Maintains stable 42V input regulation by clamping to ≤69.4V, preventing controller shutdown or bootstrap capacitor overvoltage failure. |
| LED Headlamp Driver Unit | Start-Stop System Battery Interface |
Use Scenario: Safeguards constant-current LED driver ICs against ignition coil coupling and relay bounce transients in adaptive front lighting systems. IC Role / Device Role / Timing Role: High-power TVS placed between battery feed and driver input, absorbing 400W pulses without degradation over 10⁵ cycles. Use Value: Ensures uninterrupted headlamp operation during cold-cranking (–40°C) and cranking surge (up to 16V), meeting UNECE R149 EMC immunity. |
Use Scenario: Guards supercapacitor charging circuitry and fuel injection driver FETs during engine restart transients in 12V/48V mild-hybrid architectures. IC Role / Device Role / Timing Role: Bidirectional transient absorber on dual-rail interface, suppressing reverse-polarity and load-dump energy simultaneously. Use Value: Eliminates need for separate uni-directional TVS pairs, reducing BOM count and PCB area while maintaining ASIL-B fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43CA | Identical electrical specs (VWM=43V, VBR=47.8–52.8V, VC≤69.4V), same DO-214AC package, but not AEC-Q101 qualified. | Not approved for automotive underhood use; limited to industrial or consumer-grade 42V systems without qualification traceability. | Select only if AEC-Q101 is not mandated and cost optimization is prioritized over automotive compliance documentation. |
| Vishay SMAJ43CAHE3/5A | Same VWM/VBR/VC ratings and DO-214AC package; AEC-Q101 qualified and ISO 7637-2 compliant, but rated for 300W PPPM above 78V (vs. 400W for SMAJ43CAH). | Lower peak power margin may require parallel devices in high-energy load dump scenarios (>100V, >100ms). | Preferable where Vishay supply chain alignment exists, but verify pulse energy budget using Fig.1 derating curve before deployment in critical 42V systems. |
Compared with Littelfuse SMAJ43CA and Vishay SMAJ43CAHE3/5A, the SMAJ43CAH delivers full 400W pulse capability with documented AEC-Q101 qualification and moisture level 1 - making it the only option among the three validated for zero-bake automotive production and high-reliability 42V rail protection without design compromises.
Availability
SMAJ43CAH is available at Aetrix Electronics and suitable for automotive body control modules, 42V on-board DC/DC converters, and LED headlamp driver units requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMAJ43CAH 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 automotive, industrial, and computing markets since 1979.
The SMAJ series is part of TSC's AEC-Q101-qualified TVS portfolio engineered specifically for automotive power rail and signal line protection - emphasizing robustness under ISO 7637-2 stress, low leakage, and zero-bake manufacturability.
FAQ
What does the "CAH" suffix indicate in SMAJ43CAH?
The "CAH" suffix in SMAJ43CAH denotes a bidirectional configuration ("C"), AEC-Q101 qualification ("A"), and high-reliability packaging ("H"). Unlike unidirectional "AH" variants, SMAJ43CAH provides symmetrical clamping in both polarities - essential for protecting floating or AC-coupled automotive interfaces without polarity dependency.
Is SMAJ43CAH compatible with lead-free reflow soldering processes?
Yes, SMAJ43CAH uses matte tin-plated leads compliant with J-STD-002 and supports standard lead-free reflow profiles (peak 260°C, 60s max). Its DO-214AC package meets JEDEC J-STD-020 moisture sensitivity level 1, eliminating pre-bake requirements and enabling direct placement into high-volume SMT lines.
How does SMAJ43CAH perform under repeated transient stress?
SMAJ43CAH is characterized for non-repetitive pulses per Fig.5 (10/1000μs), with derating above 25°C per Fig.2. While not rated for repetitive surges, its glass-passivated junction and 150°C TJ max enable >10⁵ transient events at 50% of rated PPPM - verified in automotive BCM validation testing per ISO 16750-2.
Can SMAJ43CAH replace SMAJ43A in existing designs?
No - SMAJ43A is unidirectional; SMAJ43CAH is bidirectional. Substituting SMAJ43CAH for SMAJ43A introduces symmetrical clamping that may interfere with DC bias networks or rectifier paths. Only replace if circuit topology explicitly supports bidirectional protection and VWM/VBR tolerances align with system margin analysis.
Does SMAJ43CAH meet RoHS and halogen-free requirements?
Yes, SMAJ43CAH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, and all materials declarations are available in TSC's IPC-1752-compliant environmental reports - supporting automotive PPAP and sustainability compliance workflows.
SMAJ43CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43CAH FAQ
1.How can I place an order for SMAJ43CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAH 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 SMAJ43CAH reliable?
The price and inventory of SMAJ43CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CAH is usually 5 days.
3.What payment methods are accepted for SMAJ43CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAH?
SMAJ43CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAH 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 SMAJ43CAH?
For technical support, including SMAJ43CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAH requirements.
6.How does Aetrix verify that SMAJ43CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAH 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 SMAJ43CAH meets industry standards.
7.What is the process for return or replacement of SMAJ43CAH?
All SMAJ43CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAH, 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 SMAJ43CAH part is unused and in its original packaging.
Return procedure for SMAJ43CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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