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Vishay General Semiconductor - Diodes Division SMAJ24CA-E3/5A
- Part No.:
- SMAJ24CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CA-E3/5A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
SMAJ24CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 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 on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ24CA-E3/5A datasheet, SMAJ24CA-E3/5A pinout, SMAJ24CA-E3/5A application, or SMAJ24CA-E3/5A equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, RoHS-compliant commercial-grade construction, thermal resistance data (RθJA = 120 °C/W), and AEC-Q101-qualified alternatives for automotive-grade design validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, critical for suppressing ESD and lightning-induced transients per IEC 61000-4-2 and IEC 61000-4-5.
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal limits defined by RθJA = 120 °C/W and TJmax = +150 °C. Polarity marking is omitted per bidirectional specification, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse stand-off voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - Verified breakdown range ensures reliable turn-on during transients without premature conduction |
| VC @ IPPM | 38.9 V at 10.3 A - Clamped voltage under 10/1000 μs surge; protects downstream ICs rated ≤36 V logic or 40 V analog rails |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; supports high-energy surge immunity |
| IPPM | 10.3 A - Peak pulse current derived from PPPM/VC; determines minimum trace width and PCB copper pad sizing |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pads per terminal for full power rating |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; surge current flows bidirectionally between them during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - simplifies layout for AC-coupled or floating signal lines |
| 400 W peak pulse power | Rated per 10/1000 μs waveform - exceeds IEC 61000-4-5 Level 4 (4 kV line-to-line) surge requirements |
| Glass passivated junction | Ensures stable leakage current (<1.0 μA at VWM) and long-term reliability under thermal cycling |
| MSL Level 1 compliance | Supports lead-free reflow up to 260 °C peak without preconditioning - compatible with standard SMT assembly lines |
| RoHS-compliant, halogen-free option | E3 suffix denotes RoHS-compliant commercial grade; M3 suffix adds halogen-free certification for green manufacturing |
Applications
| Automotive Body Control Module | Industrial RS-485 Transceiver Protection |
|---|---|
|
Use Scenario: Protects microcontroller I/O and LIN bus lines from load-dump and jump-start transients in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across power rail and signal lines to divert surge energy to ground before IC damage occurs. Use Value: Withstands 400 W pulses and clamps at 38.9 V, ensuring MCU inputs remain below absolute maximum ratings during 12 V system surges. |
Use Scenario: Shields RS-485 transceivers (e.g., MAX1487) from ESD and cable discharge events in factory automation networks. IC Role / Device Role / Timing Role: Placed differential across A/B lines and common-mode to GND to suppress both differential and common-mode transients. Use Value: Low clamping voltage (38.9 V) prevents transceiver latch-up while maintaining signal integrity up to 10 Mbps due to minimal junction capacitance (~200 pF). |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Input Stage |
|
Use Scenario: Guards gate drivers and bootstrap circuits in BLDC motor inverters against inductive kickback from brushed DC motors. IC Role / Device Role / Timing Role: Connected from half-bridge output to ground to clamp flyback spikes during MOSFET switching transitions. Use Value: Fast <1 ps response captures sub-microsecond spikes; 10.3 A IPPM handles repetitive 50–100 Hz switching surges without degradation. |
Use Scenario: Installed at AC-DC converter input to absorb lightning-induced surges entering via telecom power feeds. IC Role / Device Role / Timing Role: First-stage shunt protector upstream of bridge rectifier and bulk capacitor, limiting let-through voltage to downstream SMPS controller. Use Value: 400 W rating and 38.9 V clamping enable compliance with ITU-T K.20/21 secondary protection requirements for central office equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and thermal performance | No functional difference; selected where halogen-free materials are mandated by OEM environmental policies | Direct drop-in replacement for SMAJ24CA-E3/5A when halogen-free compliance is required |
| SMAJ24CAHE3_A/I | AEC-Q101 qualified, same VWM/VC/PPPM, but tested to automotive reliability standards (HTOL, TC, UHAST) | Required for under-hood automotive applications; not necessary for commercial/industrial use | Choose SMAJ24CAHE3_A/I only when automotive qualification and extended lifetime validation are mandatory |
Compared with SMAJ24CA-E3/5A, the M3 variant adds halogen-free construction without altering surge performance, while the HE3 variant adds AEC-Q101 qualification - enabling use in automotive safety-critical systems but requiring higher cost and longer lead times.
Availability
SMAJ24CA-E3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication interfaces, consumer appliance motor controls, and telecom power supply protection requiring stable component supply and full traceability.
Supply support for SMAJ24CA-E3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching surges is non-negotiable.
FAQ
What is the clamping voltage of SMAJ24CA-E3/5A at its rated peak pulse current?
The SMAJ24CA-E3/5A has a maximum clamping voltage (VC) of 38.9 V at its peak pulse current (IPPM) of 10.3 A, measured under the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ24CA-E3/5A maintains this clamping performance bidirectionally, making it suitable for AC signal lines and floating power domains.
Is SMAJ24CA-E3/5A suitable for automotive applications?
SMAJ24CA-E3/5A is RoHS-compliant and qualified for commercial/industrial use, but it is not AEC-Q101 certified. For automotive applications requiring qualification, the SMAJ24CAHE3_A/I variant is the designated AEC-Q101-qualified version with identical electrical characteristics. The SMAJ24CA-E3/5A may be used in non-safety-critical automotive subsystems where qualification is not mandated, but design validation must confirm reliability under vehicle-level stress profiles.
What is the thermal resistance of SMAJ24CA-E3/5A, and how does it affect PCB layout?
The SMAJ24CA-E3/5A has 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 terminal. To achieve its full 400 W peak pulse rating, the PCB must provide adequate copper area and thermal vias; reducing pad size increases RθJA, lowering sustainable surge energy. The SMAJ24CA-E3/5A's RθJL of 30 °C/W further indicates efficient heat transfer to PCB traces.
How does the bidirectional configuration of SMAJ24CA-E3/5A impact circuit protection design?
The bidirectional configuration of SMAJ24CA-E3/5A eliminates polarity sensitivity - both terminals are functionally identical, allowing placement across any two nodes without regard to anode/cathode orientation. This simplifies layout for AC-coupled interfaces (e.g., RS-485, CAN FD), transformer-isolated supplies, or floating sensors. Unlike unidirectional TVS diodes, the SMAJ24CA-E3/5A provides symmetrical clamping in either direction, ensuring consistent protection regardless of transient polarity.
What is the maximum steady-state power dissipation of SMAJ24CA-E3/5A?
The SMAJ24CA-E3/5A has a maximum steady-state power dissipation (PD) of 3.3 W at ambient temperature (TA) = 50 °C with infinite heatsink conditions. This rating applies only to continuous DC or low-frequency leakage current; transient surge handling is governed by PPPM = 400 W. In practice, the SMAJ24CA-E3/5A sees negligible steady-state power under normal operation due to sub-μA leakage at 24 V, making thermal design primarily relevant for surge recovery intervals.
SMAJ24CA-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ24CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CA-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ24CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CA-E3/5A?
SMAJ24CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CA-E3/5A 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-E3/5A?
For technical support, including SMAJ24CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ24CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24CA-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24CA-E3/5A?
All SMAJ24CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CA-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ24CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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