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Vishay General Semiconductor - Diodes Division SMAJ24C-E3/5A
- Part No.:
- SMAJ24C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24C-E3/5A.pdf
- Description:
- TVS DIODE 24VWM 43VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,410
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Product details
Overview
SMAJ24C-E3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features 24 V stand-off voltage (VWM), 43.0 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ24C-E3/5A datasheet, SMAJ24C-E3/5A pinout, SMAJ24C-E3/5A application, or SMAJ24C-E3/5A equivalent, key selection criteria include bi-directional surge suppression capability, low clamping ratio (VC/VWM = 1.79), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 26.7 V (min) and 32.6 V at 1 mA test current. Its clamping behavior is characterized under standardized 10/1000 µs surge conditions, delivering consistent protection without polarity dependence.
Thermal performance is defined by junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. The device sustains operating junction temperatures from –55 °C to +150 °C and meets J-STD-020 MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 24 V nominal circuits. |
| VC @ IPPM | 43.0 V - Clamped voltage during 9.3 A 10/1000 µs surge; limits downstream component stress to ≤43 V. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform on 5.0 × 5.0 mm copper pads; enables robust ESD/lightning surge immunity. |
| IPPM | 9.3 A - Peak surge current supported at VC; determines minimum trace width and PCB layout for transient energy dissipation. |
| VBR min/max | 26.7 V / 32.6 V - Breakdown voltage range at 1 mA; ensures reliable turn-on above VWM with controlled tolerance. |
| ID @ VWM | 1.0 µA - Reverse leakage at 24 V; negligible power loss and signal integrity impact in standby operation. |
| TJ range | –55 °C to +150 °C - Full operational junction temperature range; supports under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional configuration with no polarity marking - symmetrical terminal design for AC-coupled or floating signal line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns. |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing when mounted per recommended 5.0 × 5.0 mm pad layout. |
| Low clamping ratio (VC/VWM = 1.79) | Minimizes overvoltage exposure to protected ICs while maintaining sufficient margin above 24 V system rail. |
| MSL Level 1 & 260 °C reflow compatible | Allows standard lead-free SMT assembly without pre-baking; qualified for high-volume automated manufacturing. |
| RoHS-compliant matte tin plating | Ensures solderability per J-STD-002 and long-term reliability with JESD22-B102 qualification; whisker-tested to JESD201 Class 1A. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
|
Use Scenario: Protecting CAN/LIN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching sensitive analog front-ends. Use Value: Limits induced surges to ≤43 V, preserving ADC input integrity and preventing latch-up in 24 V vehicle subsystems. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., MAX13487, SN65HVD72) against EFT and lightning-induced common-mode surges on field wiring. IC Role / Device Role / Timing Role: Paired across A/B lines and to ground to suppress differential and common-mode transients without distorting data timing. Use Value: Maintains signal fidelity up to 250 kbps by limiting clamping overshoot and minimizing junction capacitance (typ. <100 pF at VWM). |
| Consumer Power Adapter Output | Medical Equipment Signal Isolation Barrier |
|
Use Scenario: Secondary-side overvoltage suppression on 24 V DC output rails of wall adapters subjected to line transients and capacitor discharge events. IC Role / Device Role / Timing Role: Final-stage clamp after DC-DC regulation, absorbing residual spikes that bypass bulk capacitance and ferrite filters. Use Value: Prevents damage to downstream USB-PD controllers or microcontrollers while adding <0.1 µA standby leakage. |
Use Scenario: Transient protection on isolated analog sensor inputs (e.g., EEG, ECG front-ends) where galvanic separation demands non-polarized surge handling. IC Role / Device Role / Timing Role: Bi-directional TVS placed on isolated side of digital isolators (e.g., Si86xx) or optocouplers to protect low-power instrumentation amplifiers. Use Value: Ensures patient safety compliance by limiting transient energy without introducing DC offset or signal distortion in µV-level measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-E3/5A | Same electrical specs and DO-214AC package; "CA" suffix explicitly denotes bi-directional variant per Vishay naming convention (C = bi-directional, A = enhanced VBR tolerance). | No functional difference - SMAJ24C-E3/5A and SMAJ24CA-E3/5A are identical in performance and marking; "C" and "CA" are interchangeable per Vishay documentation. | Select SMAJ24CA-E3/5A if sourcing requires explicit "CA" suffix alignment with internal BOM standards or distributor search filters. |
| SMCJ24CA | Higher power rating (1500 W vs. 400 W), larger DO-214AB (SMB) package, same 24 V VWM and bi-directional function. | Suitable for higher-energy threats (e.g., IEC 61000-4-5 Level 4); requires larger PCB footprint and different pad layout. | Choose SMCJ24CA only when surge threat level exceeds 400 W capability - not a drop-in replacement due to package and thermal interface differences. |
Compared with SMAJ24C-E3/5A, SMAJ24CA-E3/5A offers identical protection performance in the same footprint, while SMCJ24CA provides higher surge capacity at the cost of board space and thermal design changes - making SMAJ24C-E3/5A optimal for space-constrained 400 W-class protection.
Availability
SMAJ24C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial communication bus hardening, and medical signal isolation requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ24C-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, AEC-Q101 qualification, and high-volume manufacturability.
The SMAJ series is engineered for surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and reflow compatibility are critical.
FAQ
What is the polarity configuration of SMAJ24C-E3/5A?
SMAJ24C-E3/5A is a bi-directional TVS diode with symmetrical terminals and no polarity marking. Unlike uni-directional variants (e.g., SMAJ24A), it conducts identically in both directions, making it ideal for AC signal lines, differential buses, or floating power domains where voltage polarity reverses. This eliminates orientation errors during automated placement.
Does SMAJ24C-E3/5A meet automotive qualification standards?
SMAJ24C-E3/5A is RoHS-compliant and rated for operation from –55 °C to +150 °C, but it is not AEC-Q101 qualified. For automotive-grade applications, Vishay offers the SMAJ24CHE3/5A variant (HE3 suffix), which carries AEC-Q101 qualification and high-reliability screening. SMAJ24C-E3/5A remains suitable for non-safety-critical industrial or consumer 24 V systems.
What is the maximum clamping voltage of SMAJ24C-E3/5A under surge conditions?
The maximum clamping voltage (VC) of SMAJ24C-E3/5A is 43.0 V at 9.3 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions using 5.0 × 5.0 mm copper pads per JEDEC guidelines and defines the upper voltage limit imposed on protected circuitry during transient events.
How does SMAJ24C-E3/5A differ from SMAJ24A-E3/5A?
SMAJ24C-E3/5A is bi-directional with symmetrical conduction, while SMAJ24A-E3/5A is uni-directional and features a cathode band marking. Their VWM (24 V) and VC (38.9 V) differ due to distinct breakdown characteristics - SMAJ24A clamps lower but only in one direction. SMAJ24C-E3/5A is selected for AC or polarity-agnostic protection; SMAJ24A-E3/5A suits DC rails with defined ground reference.
What PCB layout guidance applies to SMAJ24C-E3/5A for optimal surge performance?
For rated 400 W pulse power, SMAJ24C-E3/5A must be mounted on minimum 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal, per Vishay Document 88390. Smaller pads reduce thermal dissipation and cause premature failure under repeated surges. Thermal vias under pads and short, wide traces to ground planes further enhance energy handling and reduce inductive overshoot.
SMAJ24C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMAJ24C-E3/5A FAQ
1.How can I place an order for SMAJ24C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24C-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 SMAJ24C-E3/5A reliable?
The price and inventory of SMAJ24C-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 SMAJ24C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24C-E3/5A?
SMAJ24C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24C-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 SMAJ24C-E3/5A?
For technical support, including SMAJ24C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24C-E3/5A requirements.
6.How does Aetrix verify that SMAJ24C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24C-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 SMAJ24C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24C-E3/5A?
All SMAJ24C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24C-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 SMAJ24C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ24C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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