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Taiwan Semiconductor Corporation SMAJ24CAH
- Part No.:
- SMAJ24CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,381
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Product details
Overview
SMAJ24CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 24V working stand-off voltage, 26.7–29.5V breakdown range at 1mA, and 38.9V clamping voltage at 10.3A peak impulse current. It protects DC/DC converters and SMPS rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ24CAH datasheet, SMAJ24CAH pinout, SMAJ24CAH application, or SMAJ24CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000μs waveform, moisture sensitivity level (MSL 1), and bidirectional TVS behavior confirmed for SMAJ24CAH - not generic SMAJ series assumptions.
Technical Context
SMAJ24CAH is a glass-passivated, bidirectional TVS diode optimized for fast transient suppression in automotive and industrial power rails. Its junction responds in <1.0ps from 0V to VBR min and maintains ≤1μA reverse leakage above 10V, enabling low-power standby integrity.
The device meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise), with 400W peak pulse power rating at TA = 25°C (derated linearly above 25°C per Fig.2) and 150°C maximum junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant leakage; sets system rail compatibility for 24V nominal systems. |
| VBR @ IT=1mA | 26.7–29.5 V - Breakdown voltage range confirming reliable turn-on margin above VWM; ensures robust triggering without premature conduction. |
| VC @ IPPM=10.3A | 38.9 V - Clamped voltage during 10/1000μs surge; defines worst-case protected circuit overvoltage stress. |
| PPPM | 400 W - Peak pulse power handling per 10/1000μs waveform; validates survivability against high-energy automotive transients. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; preserves low-power sleep mode integrity in battery-backed systems. |
| TJ max | 150 °C - Maximum junction temperature; supports operation in under-hood environments and high-ambient industrial enclosures. |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060g mass, UL 94V-0 molding, matte tin-plated leads, and JESD201 Class 2 whisker resistance. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; bidirectional symmetry means no polarity-dependent orientation-both terminals are functionally identical for transient clamping across differential or common-mode lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional clamping node | Both terminals serve as interchangeable transient shunt paths; no forward/reverse distinction required in layout. |
| Cathode band (marking) | Manufacturing polarity indicator only | Present for traceability but electrically irrelevant in bidirectional CAH configuration; does not affect clamping behavior. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD-HBM/MM, enabling use in engine control, body electronics, and ADAS modules. |
| 400W peak pulse power (10/1000μs) | Withstands high-energy transients such as load dump (Pulse 5a/b) and coupled noise (Pulse 3b) without degradation-critical for 24V commercial vehicle systems. |
| Clamping voltage ≤38.9V at 10.3A | Limits downstream IC stress to safe levels below typical 40V absolute maximum ratings of automotive MCUs and gate drivers. |
| Moisture Sensitivity Level 1 (J-STD-020) | Enables standard SMT reflow without baking or special handling-reduces manufacturing cost and process risk in high-volume assembly. |
| Meets ISO 7637-2 (Pulse 1/2a/2b/3a/3b) | Complies with full suite of automotive transient immunity standards, eliminating need for supplemental filtering in CAN, LIN, and sensor interface designs. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V DC/DC Converter |
|---|---|
Use Scenario: Protects microcontroller I/O and power supply inputs from load dump and relay switching transients in door module, lighting, and seat control units. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at 24V input rail and signal lines to absorb energy before it reaches sensitive logic and analog circuits. Use Value: Prevents latch-up or permanent damage during ISO 7637-2 Pulse 5a (load dump up to 60V/100ms), ensuring functional safety compliance without derating. |
Use Scenario: Shields primary-side MOSFET gates and secondary-side feedback circuitry in isolated flyback or forward converters used in factory automation equipment. IC Role / Device Role / Timing Role: Fast-response shunt element across input capacitor or across transformer windings to limit voltage overshoot during line surges or output short-circuit recovery. Use Value: Maintains <38.9V clamping under 10.3A 10/1000μs surge, preserving gate oxide integrity and optocoupler CTR stability in long-lifetime industrial power supplies. |
| Commercial Vehicle Telematics Unit | LED Streetlight Driver Power Stage |
Use Scenario: Guards GNSS receiver, cellular modem, and CAN transceiver power rails against battery transients during jump-start, alternator regulation faults, and ignition cycling. IC Role / Device Role / Timing Role: Primary overvoltage suppression device on 24V main input, positioned upstream of DC/DC regulators feeding RF and digital subsystems. Use Value: Delivers sub-1ps response and MSL-1 reliability, enabling direct placement on compact PCBs without thermal derating concerns in sealed outdoor enclosures. |
Use Scenario: Safeguards constant-current LED driver ICs and MOSFET switches from lightning-induced surges and grid switching spikes in outdoor lighting infrastructure. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor or across bridge rectifier output to clamp AC line transients before they propagate into switching stage. Use Value: Withstands repeated 400W pulses without parameter shift, supporting >50,000-hour field life in unattended streetlight deployments with minimal maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | Same electrical specs but lacks AEC-Q101 qualification; no ISO 7637-2 validation or MSL-1 rating. | Restricted to non-automotive industrial or consumer applications where automotive reliability is not mandated. | Select SMAJ24CA only when AEC-Q101 and ISO 7637-2 compliance are unnecessary and cost is prioritized. |
| SMBJ24CA | DO-214AA (SMB) package; same VWM/VBR/VC, but lower 600W PPPM rating and higher thermal resistance (RθJA ≈ 75°C/W vs. SMA's 65°C/W). | Acceptable for lower-duty-cycle surges; less suitable for repetitive automotive transients due to reduced power density and thermal margin. | Choose SMBJ24CA only if board space allows larger footprint and thermal design accommodates higher junction rise. |
Compared with SMAJ24CA and SMBJ24CA, SMAJ24CAH uniquely combines AEC-Q101 qualification, ISO 7637-2 compliance, MSL-1 handling, and DO-214AC thermal efficiency-making it the only option qualified for automotive front-end protection without layout or reliability compromise.
Availability
SMAJ24CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24V DC/DC converters, and outdoor LED driver designs requiring stable component supply, AEC-Q101 assurance, and ISO 7637-2 transient immunity.
Supply support for SMAJ24CAH 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 since 1979.
SMAJ24CAH belongs to TSC's AEC-Q101-qualified SMAJ(A)H family, engineered specifically for automotive and harsh-environment transient suppression where reliability, fast response, and standardized packaging are mandatory.
FAQ
What does the "CAH" suffix mean in SMAJ24CAH?
The "CAH" suffix in SMAJ24CAH denotes a bidirectional TVS diode (C), AEC-Q101 qualified (A), and halogen-free construction (H). This distinguishes it from unidirectional "AH" variants and non-automotive "H" versions. SMAJ24CAH is explicitly validated for automotive use per AEC-Q101 stress tests and ISO 7637-2 transient immunity standards.
Does SMAJ24CAH require polarity-aware PCB layout?
No - SMAJ24CAH is a bidirectional TVS diode, meaning both terminals perform identically under positive or negative transients. The cathode band marking is for manufacturing traceability only and has no functional impact on clamping behavior. Layout may orient the device freely in either direction without affecting protection performance.
What is the clamping voltage of SMAJ24CAH under a 10/1000μs surge?
SMAJ24CAH clamps to a maximum of 38.9 V when subjected to its rated peak impulse current of 10.3 A under the standardized 10/1000μs waveform. This value is measured per JEDEC/IEC test conditions and guarantees downstream circuit protection within safe voltage margins for 24V-system ICs with 40V absolute maximum ratings.
Is SMAJ24CAH compatible with lead-free reflow soldering processes?
Yes - SMAJ24CAH uses matte tin-plated leads compliant with J-STD-002 and is rated for standard lead-free reflow profiles (peak temperature up to 260°C). Its MSL-1 rating per J-STD-020 eliminates pre-baking requirements, enabling direct placement into high-throughput SMT lines without moisture-related defects.
How does SMAJ24CAH differ from SMAJ24AH?
SMAJ24AH is a unidirectional TVS diode with anode/cathode polarity, while SMAJ24CAH is bidirectional and symmetrical. SMAJ24CAH also carries AEC-Q101 qualification and ISO 7637-2 validation - features absent in SMAJ24AH. Electrically, SMAJ24CAH has identical VWM (24 V), VBR (26.7–29.5 V), and VC (38.9 V) but supports differential and common-mode surge suppression without polarity constraints.
SMAJ24CAH 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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)
SMAJ24CAH FAQ
1.How can I place an order for SMAJ24CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAH 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 SMAJ24CAH reliable?
The price and inventory of SMAJ24CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CAH is usually 5 days.
3.What payment methods are accepted for SMAJ24CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAH?
SMAJ24CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAH 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 SMAJ24CAH?
For technical support, including SMAJ24CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAH requirements.
6.How does Aetrix verify that SMAJ24CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAH 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 SMAJ24CAH meets industry standards.
7.What is the process for return or replacement of SMAJ24CAH?
All SMAJ24CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAH, 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 SMAJ24CAH part is unused and in its original packaging.
Return procedure for SMAJ24CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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