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Vishay General Semiconductor - Diodes Division SMAJ24A-E3/5A
- Part No.:
- SMAJ24A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24A-E3/5A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:10,356
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Product details
Overview
SMAJ24A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode 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, and clamps transients to ≤38.9 V at 10.3 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed on power rails and I/O lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ24A-E3/5A datasheet, SMAJ24A-E3/5A pinout, SMAJ24A-E3/5A application, or SMAJ24A-E3/5A equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), low 0.096 %/°C VBR temperature coefficient, SMA (DO-214AC) surface-mount package, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
Technical Context
This unidirectional TVS operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ns) to ESD and lightning-induced surges.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for full 400 W rating. The cathode band denotes polarity; no marking applies to bidirectional versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - guaranteed avalanche onset range for reliable trigger threshold |
| VC @ IPPM | 38.9 V at 10.3 A - clamped voltage during 10/1000 μs surge, defining worst-case stress on downstream ICs |
| PPPM | 400 W - peak pulse power handling capability with 10/1000 μs waveform, derated above 25 °C |
| ID @ VWM | 1.0 μA - ultra-low leakage ensuring minimal standby power loss in battery-powered systems |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 2.54 mm lead pitch and MSL Level 1 rating |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground during overvoltage events |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane to complete clamping path |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in standard PCB layouts |
| Glass passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime cycling |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without pre-baking or special handling requirements |
| AEC-Q101 qualification option | HE3/HM3 suffix variants meet automotive-grade reliability for engine control, ADAS, and body electronics |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a) |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied microcontroller power input in engine control unit exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND to clamp transients before they reach LDO or MCU VDD pins. Use Value: Limits voltage to ≤38.9 V during 10.3 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. |
Use Scenario: RS-485 transceiver data lines in factory automation PLC I/O module subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS pair (one per line) referenced to common-mode ground to suppress differential and common-mode transients. Use Value: Sub-1 ns response preserves signal integrity on 10 Mbps buses while maintaining <1 μA leakage at 24 V nominal. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: VBUS line of USB 2.0 host port in set-top box subjected to ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Primary clamping device on 5 V supply rail upstream of USB switch or controller. Use Value: Clamps ESD pulses to <40 V within nanoseconds, protecting internal 5 V tolerant PHY without affecting hot-plug timing. |
Use Scenario: DC power feed line (48 V) to VoIP phone interface board exposed to lightning-induced surges per GR-1089-CORE. IC Role / Device Role / Timing Role: First-stage protector in series with PTC and secondary TVS, absorbing bulk energy before downstream components. Use Value: Handles 400 W single-event surges while maintaining 24 V standoff, enabling compact front-end design with minimal voltage drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package | No functional difference; selected where halogen-free compliance is mandated in final assembly | Direct material substitution when environmental compliance drives BOM change |
| SMAJ24CA-E3/5A | Bidirectional version with same VWM (24 V), symmetric clamping in both polarities, ID doubled to 2.0 μA | Required for AC-coupled or floating signal lines where reverse polarity transients occur (e.g., Ethernet PHY pairs) | Choose only when bidirectional protection is explicitly needed; not interchangeable in unidirectional circuits |
Compared with SMAJ24A-E3/5A, the M3/5A offers identical protection performance with halogen-free construction, while SMAJ24CA-E3/5A provides symmetrical clamping essential for AC signals - neither is pin-compatible without verifying circuit polarity and grounding topology.
Availability
SMAJ24A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer USB port ESD mitigation requiring stable component supply and traceable sourcing.
Supply support for SMAJ24A-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 and application-specific optimization.
The SMAJ series targets high-energy transient suppression in space-constrained, high-reliability applications - engineered for automotive, industrial, and telecom systems where consistent clamping and thermal robustness are critical.
FAQ
What is the maximum clamping voltage of the SMAJ24A-E3/5A under standard test conditions?
The SMAJ24A-E3/5A exhibits a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 10.3 A using the 10/1000 μs waveform. This value is measured at TJ = 25 °C with devices mounted on 5.0 mm × 5.0 mm copper pads per terminal, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ24A-E3/5A maintains this clamping performance across its operational temperature range with minimal drift due to its 0.096 %/°C VBR coefficient.
Is the SMAJ24A-E3/5A suitable for automotive applications?
The SMAJ24A-E3/5A itself is commercial-grade, but Vishay offers AEC-Q101 qualified variants under ordering codes SMAJ24AHE3_X and SMAJ24AHM3_X. These qualified versions undergo extended stress testing for temperature cycling, humidity, and mechanical shock - making them suitable for engine bay, chassis, and ADAS modules. The SMAJ24A-E3/5A shares identical electrical characteristics and package dimensions, allowing direct layout reuse when upgrading to automotive grade.
How does the SMAJ24A-E3/5A differ from the SMAJ24CA-E3/5A?
The SMAJ24A-E3/5A is unidirectional, with cathode marked and clamping active only in reverse bias; the SMAJ24CA-E3/5A is bidirectional, offering symmetrical clamping for both polarities and no polarity marking. Their VWM, VBR, and VC values are identical in magnitude, but the CA version doubles the maximum reverse leakage (ID) to 2.0 μA at VWM. The SMAJ24A-E3/5A must not be substituted for SMAJ24CA-E3/5A in AC-coupled circuits without redesigning grounding and biasing.
What is the thermal resistance profile of the SMAJ24A-E3/5A?
The SMAJ24A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured under standard JEDEC conditions. Full 400 W pulse power rating requires mounting on minimum 5.0 mm × 5.0 mm copper pads per terminal; reducing pad area increases thermal impedance and necessitates derating. The SMAJ24A-E3/5A remains within safe operating limits up to +150 °C junction temperature, supporting use in high-ambient environments like automotive under-hood locations.
Does the SMAJ24A-E3/5A require special PCB layout considerations?
Yes - to achieve rated 400 W pulse power, the SMAJ24A-E3/5A must be mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's recommended layout. Short, wide traces minimize inductance in the clamping path; ground planes should be solid and uninterrupted beneath the device. Avoid thermal reliefs on pads, and ensure the cathode-to-ground path is lower inductance than the anode return. The SMAJ24A-E3/5A's DO-214AC footprint is standardized, but performance depends critically on this layout adherence.
SMAJ24A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ24A-E3/5A FAQ
1.How can I place an order for SMAJ24A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24A-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 SMAJ24A-E3/5A reliable?
The price and inventory of SMAJ24A-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 SMAJ24A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24A-E3/5A?
SMAJ24A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24A-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 SMAJ24A-E3/5A?
For technical support, including SMAJ24A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24A-E3/5A requirements.
6.How does Aetrix verify that SMAJ24A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24A-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 SMAJ24A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24A-E3/5A?
All SMAJ24A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24A-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 SMAJ24A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ24A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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