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Taiwan Semiconductor Corporation SMAJ24CA
- Part No.:
- SMAJ24CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CA.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
SMAJ24CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 24 V working stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR), 38.9 V maximum clamping voltage (VC) at 10.3 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive power supplies and industrial DC/DC converters.
For engineers reviewing the SMAJ24CA datasheet, SMAJ24CA pinout, SMAJ24CA application, or SMAJ24CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package compatibility, and sub-1 ps response time under transient stress.
Technical Context
The SMAJ24CA implements a glass-passivated silicon junction optimized for fast avalanche response and low leakage (<1 µA at VWM). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating bus applications without polarity dependency.
It operates across –55 °C to +150 °C junction temperature range, supports 40 A non-repetitive forward surge (IFSM), and maintains stable clamping performance under repetitive transients when derated per Fig.2 - critical for engine control units and on-board chargers exposed to load dump and inductive switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Confirmed breakdown threshold ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 38.9 V @ 10.3 A - Clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 400 W - Peak pulse power handling capacity with standardized waveform, enabling high-energy transient suppression |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves system standby current budget in battery-powered designs |
| Response time | <1.0 ps - Sub-picosecond junction response ensures clamping activation before sensitive circuitry sustains damage |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline compatible with automated assembly and IPC-7351B land patterns |
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 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path for negative excursions | Completes bidirectional clamping loop; connects to ground or low-impedance reference plane |
| Cathode (banded end) | Transient return path for positive excursions | Connects to protected line; band orientation defines physical polarity marking per JEDEC DO-214AC standard |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without external polarity management |
| ISO 7637-2 compliance | Validated against automotive load dump (Pulse 2b), supply interruption (Pulse 3b), and coupled transients (Pulse 1/2a/3a) |
| Glass passivated junction | Ensures long-term reliability and stable VBR drift under thermal cycling and humidity exposure |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, supporting standard SMT manufacturing flow without special handling |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Engine Control Unit (ECU) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protection of 24 V CAN bus interface and sensor supply lines against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing ±100 V/100 ms transients while maintaining <1 µA leakage during sleep mode. Use Value: Prevents microcontroller reset and sensor data corruption during cold-crank and jump-start events per ISO 16750-2. |
Use Scenario: Input rail protection for isolated 24 V-to-5 V DC/DC modules powering PLC I/O circuits. IC Role / Device Role / Timing Role: Fast-response shunt device limiting input voltage to ≤38.9 V during 400 W surges, preserving upstream MOSFET gate oxide integrity. Use Value: Enables use of lower-voltage-rated input capacitors and reduces need for redundant filtering stages. |
| LED Streetlight Driver Board | Telecom Power Shelf Surge Port |
Use Scenario: Overvoltage suppression on constant-current LED driver input subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping element diverting >10 A transients away from PFC controller and bulk capacitor. Use Value: Extends MTBF by preventing electrolytic capacitor venting and gate-driver latch-up during repeated 10/1000 µs events. |
Use Scenario: Secondary-stage protection on -48 V telecom power distribution board downstream of primary MOV-based surge arrestors. IC Role / Device Role / Timing Role: Precision clamping device with tight VBR tolerance (±5%) ensuring coordinated let-through voltage with upstream protectors. Use Value: Reduces risk of false triggering in monitoring ICs and avoids over-clamping that could disrupt -48 V regulation stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA (Bourns) | Same DO-214AA package; 600 W PPPM rating; higher VC = 38.9 V @ 17.1 A; tighter VBR tolerance (±5% vs ±6.5%) | Preferred where higher surge margin is required without changing PCB footprint | Select SMBJ24CA if system-level testing shows marginal margin with 400 W rating |
| P6SMB24CA (Littelfuse) | DO-214AA package; identical VWM/VBR/VC specs; 600 W PPPM; meets AEC-Q101 but not ISO 7637-2 certified | Used in non-automotive industrial controls where automotive qualification is not mandated | Choose P6SMB24CA when AEC-Q101 qualification is needed but ISO 7637-2 validation is unnecessary |
Compared with SMBJ24CA and P6SMB24CA, the SMAJ24CA offers optimal balance of automotive-grade transient immunity, compact DO-214AC footprint, and cost efficiency for volume production - especially where ISO 7637-2 compliance is mandatory and 400 W surge capacity suffices.
Availability
SMAJ24CA is available at Aetrix Electronics and suitable for automotive ECU designs, industrial DC/DC converter inputs, and LED driver protection requiring stable component supply and full traceability.
Supply support for SMAJ24CA 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 with global distribution and AEC-Q101-qualified product lines.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing ISO 7637-2 compliance, high surge robustness in compact surface-mount packages, and reliability under extended thermal cycling.
FAQ
What is the clamping voltage of SMAJ24CA under a 10/1000 µs surge?
The SMAJ24CA has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 10.3 A under the standardized 10/1000 µs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet (U2102) and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ24CA unidirectional or bidirectional?
SMAJ24CA is a bidirectional TVS diode, as confirmed by the "CA" suffix and explicit documentation stating "Electrical characteristics apply in both directions" and "For bidirectional use C or CA suffix". It provides symmetrical clamping for both positive and negative transients without requiring polarity-aware placement.
Does SMAJ24CA meet automotive transient standards?
Yes, SMAJ24CA meets ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b, as explicitly stated in the Features section of the Taiwan Semiconductor datasheet. This certification validates its suitability for 12 V and 24 V automotive power networks including engine control, body electronics, and infotainment systems.
What is the maximum operating junction temperature for SMAJ24CA?
The SMAJ24CA has a maximum operating junction temperature (TJ MAX) of +150 °C, with a specified operating range from –55 °C to +150 °C. This rating supports deployment in under-hood automotive environments and thermally demanding industrial enclosures without derating below ambient temperatures up to +125 °C.
What package type does SMAJ24CA use, and is it RoHS compliant?
SMAJ24CA uses the DO-214AC (SMA) surface-mount package and is fully RoHS compliant and halogen-free per IEC 61249-2-21. The device carries matte tin-plated leads, meets JESD201 Class 2 whisker resistance, and is rated moisture sensitivity level 1 - enabling standard reflow without pre-bake.
SMAJ24CA 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24CA FAQ
1.How can I place an order for SMAJ24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CA 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 SMAJ24CA reliable?
The price and inventory of SMAJ24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CA is usually 5 days.
3.What payment methods are accepted for SMAJ24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CA?
SMAJ24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CA 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 SMAJ24CA?
For technical support, including SMAJ24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CA requirements.
6.How does Aetrix verify that SMAJ24CA is sourced from the original manufacturer or authorized distributors?
All SMAJ24CA 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 SMAJ24CA meets industry standards.
7.What is the process for return or replacement of SMAJ24CA?
All SMAJ24CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CA, 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 SMAJ24CA part is unused and in its original packaging.
Return procedure for SMAJ24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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