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Vishay General Semiconductor - Diodes Division SMAJ24CA-M3/5A
- Part No.:
- SMAJ24CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CA-M3/5A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,129
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Product details
Overview
SMAJ24CA-M3/5A from Vishay General 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 standoff voltage (VWM), 38.9 V maximum clamping voltage (VC) at 10.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed to safeguard MOSFETs, ICs, and sensor interfaces against ESD and inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SMAJ24CA-M3/5A datasheet, SMAJ24CA-M3/5A pinout, SMAJ24CA-M3/5A application, or SMAJ24CA-M3/5A equivalent, key selection criteria include verified bidirectional clamping behavior, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification status, and thermal derating performance up to +150 °C junction temperature.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 24 V), but triggers into low-impedance conduction when transient voltage exceeds its 26.7–29.5 V breakdown range (VBR at 1 mA). Its bidirectional symmetry ensures identical clamping in both polarities - critical for AC-coupled or floating signal paths.
Constructed with a glass-passivated silicon junction and housed in an SMA (DO-214AC) package, SMAJ24CA-M3/5A delivers sub-nanosecond response time and low incremental surge resistance (<0.5 Ω typical), enabling effective suppression of fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without signal distortion or latch-up risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Confirmed bidirectional avalanche onset; ensures reliable triggering across manufacturing lot and temperature |
| VC (Clamping Voltage) | 38.9 V at 10.3 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge; enables safe margin for 3.3 V/5 V/24 V logic and power stages |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability on 0.2" × 0.2" copper pads; supports repetitive surge events at 0.01% duty cycle |
| IPPM (Peak Pulse Current) | 10.3 A - Maximum non-repetitive surge current handled without degradation; validated per Fig. 3 waveform in Vishay Doc. 88390 |
| TJmax | +150 °C - Maximum junction temperature rating; allows operation in under-hood automotive or enclosed industrial environments |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with IPC-7351B footprint |
Pinout & Package
Package: SMA (DO-214AC) - molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), RoHS-compliant and halogen-free (M3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; common reference for bidirectional clamping | No polarity marking required - symmetrical structure enables identical performance regardless of orientation in PCB layout |
| Cathode (unmarked end) | Current exit point in forward bias; functionally identical to anode in bidirectional mode | Both terminals behave identically under reverse or forward transient stress; no cathode band present per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for orientation-aware placement in AC or differential signal protection |
| 400 W peak pulse power | Validated at 25 °C on 5.0 mm × 5.0 mm copper pads - enables single-device protection for CAN, LIN, RS-485, and 24 V power inputs without external heat sinking |
| AEC-Q101 qualified option | M3 suffix denotes halogen-free, RoHS-compliant commercial grade; HE3/HM3 variants available for automotive-grade qualification |
| Low clamping ratio (VC/VWM = 1.62) | 38.9 V clamp at 24 V standoff - tighter voltage margin than standard Zener-based protectors, reducing stress on downstream 24 V-rated components |
| Fast response time | Sub-nanosecond avalanche turn-on - suppresses transients faster than propagation delay of most microcontrollers and gate drivers |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 24 V supply rail and switch-sense inputs from load dump (ISO 16750-2) and inductive kickback in door lock actuators and window lift motors. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector entry point to clamp transients before reaching MCU GPIOs and level translators. Use Value: Withstands 400 W pulses and maintains <1 μA leakage at 24 V, ensuring no impact on sleep-mode current or sensor accuracy during normal operation. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring faults, relay coil flyback, and electrostatic discharge in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional clamping element across input terminals to absorb both positive and negative polarity surges induced by long cable runs. Use Value: Symmetrical 26.7–29.5 V breakdown and 38.9 V clamping ensure consistent protection regardless of transient polarity - eliminating need for dual unidirectional devices. |
| Telecom Remote Radio Unit (RRU) Power Interface | Consumer Appliance Motor Drive Board |
|
Use Scenario: Shielding 24 V DC power feed to outdoor base station radios from lightning-induced surges and AC mains coupling. IC Role / Device Role / Timing Role: First-line transient suppressor mounted adjacent to power entry connector, preceding bulk capacitance and DC/DC converter. Use Value: 150 °C max junction temperature and MSL Level 1 rating support reliable reflow soldering and long-term operation in unventilated enclosures. |
Use Scenario: Protecting microcontroller I/O pins and H-bridge gate drivers from back-EMF generated by brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Localized TVS on motor driver output traces to limit voltage overshoot during PWM switching transitions. Use Value: Low incremental surge resistance (<0.5 Ω) minimizes VC rise during high-di/dt events, preventing false triggering or latch-up in sensitive logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-M3/5A | Unidirectional variant; same VWM, VBR, VC, and PPPM, but requires correct polarity orientation during placement | Only suitable where circuit topology guarantees defined polarity (e.g., DC power rail with known ground reference) | Select SMAJ24A-M3/5A only if board layout enforces fixed polarity and space constraints favor elimination of orientation ambiguity |
| SMBJ24CA-M3 | Same electrical specs but SMB (DO-214AA) package - 3.56 mm width vs. SMA's 4.50 mm; 600 W PPPM rating due to larger pad area | Higher power handling and lower thermal resistance (RθJA = 80 °C/W vs. 120 °C/W), but requires revised footprint and stencil | Choose SMBJ24CA-M3 when surge energy exceeds 400 W limits or thermal management demands lower junction-to-ambient resistance |
Compared with SMAJ24A-M3/5A, SMAJ24CA-M3/5A eliminates polarity dependency in layout and simplifies BOM control for bidirectional signal paths; versus SMBJ24CA-M3, it trades 200 W peak power headroom for smaller PCB area and compatibility with legacy SMA footprints.
Availability
SMAJ24CA-M3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power interfaces, and consumer appliance motor controls requiring stable component supply and halogen-free compliance.
Supply support for SMAJ24CA-M3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, load dump, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SMAJ24CA-M3/5A at its rated peak pulse current?
The SMAJ24CA-M3/5A has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated 10.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay Document Number 88390 and reflects the actual voltage imposed on protected circuitry during worst-case transient events - critical for verifying margin against downstream component absolute maximum ratings.
Is SMAJ24CA-M3/5A suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ24CA-M3/5A itself is the commercial-grade halogen-free variant (M3 suffix); AEC-Q101 qualification is available under the HM3 suffix (e.g., SMAJ24CAHM3_A/I). While SMAJ24CA-M3/5A shares identical electrical and thermal characteristics, formal automotive qualification requires the HM3-part number - confirmed in Vishay's ordering information table on page 3 of Doc. 88390.
How does the bidirectional design of SMAJ24CA-M3/5A affect PCB layout compared to unidirectional TVS diodes?
The SMAJ24CA-M3/5A has no polarity marking and identical electrical behavior in both directions, allowing unrestricted orientation during automated placement - unlike unidirectional variants such as SMAJ24A-M3/5A, which require cathode-band alignment. This eliminates orientation verification steps, reduces placement error risk, and simplifies layout for AC-coupled or floating interfaces like RS-485 or CAN bus termination networks.
What is the thermal resistance and maximum power dissipation of SMAJ24CA-M3/5A under standard mounting conditions?
SMAJ24CA-M3/5A exhibits a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per Vishay Doc. 88390. Its steady-state power dissipation (PD) is rated at 3.3 W at TA = 50 °C - meaning sustained DC leakage must remain below ~138 μA at 24 V to avoid exceeding this limit, making it suitable for intermittent surge-only applications rather than continuous power regulation.
Does SMAJ24CA-M3/5A meet moisture sensitivity level (MSL) requirements for lead-free reflow soldering?
Yes, SMAJ24CA-M3/5A meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C - fully compatible with standard lead-free soldering profiles. This is explicitly stated in the Mechanical Data section of Vishay Document 88390 and confirmed by its matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
SMAJ24CA-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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-M3/5A FAQ
1.How can I place an order for SMAJ24CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ24CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CA-M3/5A?
SMAJ24CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CA-M3/5A 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-M3/5A?
For technical support, including SMAJ24CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ24CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24CA-M3/5A?
All SMAJ24CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ24CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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