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Vishay General Semiconductor - Diodes Division SMA5J24CAHM3_A/H
- Part No.:
- SMA5J24CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J24CAHM3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,398
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Product details
Overview
SMA5J24CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage (VC) at 12.9 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J24CAHM3_A/H datasheet, SMA5J24CAHM3_A/H pinout, SMA5J24CAHM3_A/H application, or SMA5J24CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped crowbar during transients, with symmetrical breakdown characteristics in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable VBR (26.7–29.5 V) and low incremental surge resistance, enabling consistent clamping under repetitive 10/1000 µs surges up to 500 W.
Designed for surface-mount automation, it meets MSL Level 1 (260 °C reflow peak) and supports operation from –55 °C to +150 °C junction temperature. The SMA package provides mechanical robustness and thermal dissipation via copper pad mounting, with polarity unmarked per bidirectional convention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 26.7 V / 29.5 V - Verified breakdown range at 1 mA test current; ensures predictable turn-on across production lot. |
| VC @ IPPM | 38.9 V at 12.9 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 40 V threshold. |
| PPPM | 500 W - Peak pulse power handling with standard 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 immunity. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| RθJA | 80 °C/W - Thermal resistance junction-to-ambient on 5.0 mm × 5.0 mm copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Cathode band absent; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied. |
| Case (body) | Thermal and mechanical interface | Non-electrical; serves as heat sink path to PCB copper; requires minimum 5.0 mm × 5.0 mm pad per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A110/A111. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020; supports environmentally regulated supply chains. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection margin. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role: Bidirectional voltage clamp placed between signal line and ground, absorbing energy before it reaches the protected IC. Use Value: Maintains signal integrity during 100 V/500 W transients while meeting AEC-Q101 requirements for under-hood deployment. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring surge events per IEC 61000-4-4/5. IC Role / Device Role: Primary surge suppression element at connector entry point, shunting transient current to chassis ground. Use Value: Delivers 38.9 V clamping at 12.9 A, ensuring downstream optocouplers and microcontrollers remain within absolute maximum ratings. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding RS-485/RS-232 data lines in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role: Fast-response TVS placed differential-mode across signal pair and common-mode to ground. Use Value: Symmetrical 26.7–29.5 V breakdown enables balanced clamping without skew, preserving signal timing integrity. |
Use Scenario: Adding secondary-level surge immunity to USB-C and barrel-jack inputs in smart home adapters exposed to user-handling ESD. IC Role / Device Role: Low-capacitance (<100 pF typical at VWM) bidirectional clamp limiting voltage spikes to <40 V. Use Value: Halogen-free HM3 construction satisfies regional environmental mandates while maintaining 500 W surge rating in compact SMA footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J24CAHE3_A/H | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance certification. | Qualified for commercial/industrial use only; not approved for automotive AEC-Q101 applications. | Select when halogen-free requirement is waived and cost sensitivity outweighs automotive qualification needs. |
| SMA6J24CAHM3_A/H | 600 W PPPM rating (vs. 500 W); identical VWM, VBR, VC, and package; higher surge current capability (15.4 A vs. 12.9 A). | Supports higher-energy threat profiles (e.g., IEC 61000-4-5 Level 5); same PCB footprint and layout. | Choose when system-level surge testing exceeds 500 W requirements but board space and qualification continuity must be preserved. |
Compared with SMA5J24CAHM3_A/H, SMA5J24CAHE3_A/H omits halogen-free and AEC-Q101 compliance, while SMA6J24CAHM3_A/H delivers 20 % higher surge power handling in identical form factor - enabling direct upgrade without layout change where enhanced immunity is mandated.
Availability
SMA5J24CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMA5J24CAHM3_A/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMA5JxxCA family targets high-power-density transient suppression in space-constrained, high-reliability systems - engineered for automotive, industrial, and telecom applications demanding AEC-Q101 validation and robust surge immunity.
FAQ
What does the "HM3" suffix indicate for SMA5J24CAHM3_A/H?
The HM3 suffix on SMA5J24CAHM3_A/H denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance certification and full AEC-Q101 qualification. This distinguishes it from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants, confirming suitability for automotive under-hood use and environmentally regulated markets.
Is SMA5J24CAHM3_A/H suitable for protecting CAN bus lines?
Yes, SMA5J24CAHM3_A/H is appropriate for CAN bus protection due to its bidirectional clamping, 24 V VWM aligning with 12 V/24 V automotive supply rails, and 38.9 V VC that stays well below the 40 V absolute maximum rating of most CAN transceivers. Its fast response time and AEC-Q101 qualification further support reliable operation in automotive networks.
What is the maximum clamping voltage of SMA5J24CAHM3_A/H under surge conditions?
The maximum clamping voltage (VC) of SMA5J24CAHM3_A/H is 38.9 V, measured at 12.9 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and forms the basis for downstream IC overvoltage margin analysis in circuit design.
Does SMA5J24CAHM3_A/H require polarity-aware PCB layout?
No, SMA5J24CAHM3_A/H does not require polarity-aware layout because it is a bidirectional TVS diode with symmetrical terminal construction and no cathode marking. Both leads are electrically identical, allowing placement in either orientation on the PCB without functional impact - simplifying automated assembly and reducing layout constraints.
How does the thermal performance of SMA5J24CAHM3_A/H affect PCB design?
SMA5J24CAHM3_A/H has a junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under 500 W surge, PCB layout must provide adequate copper area and minimize thermal isolation - underscoring the need for verified pad dimensions and potential use of internal ground planes for heat spreading.
SMA5J24CAHM3_A/H 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):
- 12.9A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J24CAHM3_A/H FAQ
1.How can I place an order for SMA5J24CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J24CAHM3_A/H 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 SMA5J24CAHM3_A/H reliable?
The price and inventory of SMA5J24CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J24CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J24CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J24CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J24CAHM3_A/H?
SMA5J24CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J24CAHM3_A/H 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 SMA5J24CAHM3_A/H?
For technical support, including SMA5J24CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J24CAHM3_A/H requirements.
6.How does Aetrix verify that SMA5J24CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J24CAHM3_A/H 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 SMA5J24CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J24CAHM3_A/H?
All SMA5J24CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J24CAHM3_A/H, 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 SMA5J24CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMA5J24CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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