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Vishay General Semiconductor - Diodes Division SMAJ24CAHE3/61
- Part No.:
- SMAJ24CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHE3/61.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,991
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Product details
Overview
SMAJ24CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown range (VBR at 1 mA), 38.9 V max clamping voltage (VC) at 10.3 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and automotive control modules.
For engineers reviewing the SMAJ24CAHE3/61 datasheet, SMAJ24CAHE3/61 pinout, SMAJ24CAHE3/61 application, or SMAJ24CAHE3/61 equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT assembly on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage (<1.0 μA at 24 V) and fast response (<1 ns), while the SMA package supports high surge current handling (10.3 A IPPM) under repetitive 0.01% duty cycle conditions.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal derating above 25 °C ambient per Figure 2. It meets J-STD-020 MSL Level 1 (peak reflow 260 °C) and is qualified to AEC-Q101 for automotive under-hood and body-control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - Verified breakdown threshold range; ensures reliable triggering above system transients but below IC damage thresholds. |
| VC @ IPPM | 38.9 V at 10.3 A - Clamped voltage during 400 W surge; limits downstream voltage stress to <1.62× VWM, critical for 3.3 V/5 V logic interface protection. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy absorption capability; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A (8.3 ms half-sine) - Forward surge rating for unidirectional variants; not applicable to SMAJ24CAHE3/61 (bidirectional), but confirms robust chip construction. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal heatsinking. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard PCB pads; informs thermal design margin for sustained power dissipation (PD = 3.3 W). |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Bidirectional construction means no polarity marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically as transient current entry/exit points; no cathode band marking required per datasheet Note on polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and HTRB - enables use in engine control units and ADAS sensors without additional qualification. |
| 400 W peak pulse power (10/1000 μs) | Supports repeated surge events up to 0.01% duty cycle without degradation - suitable for industrial motor drive I/O protection where switching transients occur frequently. |
| Clamping voltage ≤ 38.9 V at 10.3 A | Provides tight overvoltage limiting for 24 V supply rails and CAN/FlexRay physical layers - prevents latch-up or gate oxide rupture in protected ICs. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking - reduces manufacturing complexity and cost in high-volume SMT lines. |
| Glass passivated junction | Ensures stable leakage (<1.0 μA at VWM) and long-term parameter stability across temperature and humidity - critical for battery-powered sensor nodes. |
Applications
| Automotive Body Control Module | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs against load dump and inductive kickback in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between microcontroller GPIO and external connector pins. Use Value: Limits transient voltage to ≤38.9 V during 100 V/50 ms load dump events, preventing damage to 5 V tolerant LIN transceivers and maintaining communication integrity. |
Use Scenario: Safeguarding analog output lines (0–10 V, 4–20 mA) of pressure/temperature transmitters in factory automation PLCs. IC Role / Device Role / Timing Role: Parallel-connected TVS at field-side connector to shunt induced surges before reaching precision DAC or op-amp circuitry. Use Value: Maintains signal accuracy by clamping transients within 100 ns, with <1.0 μA leakage ensuring <0.1% full-scale error contribution at 10 V output. |
| Automotive Camera Power Line | Consumer USB-C ESD Protection |
Use Scenario: Shielding 12 V power input of surround-view camera modules from jump-start spikes and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail upstream of DC-DC converter. Use Value: Absorbs 400 W surges without failure, sustaining operation after ISO 16750-2 Test 4a (12 V system, 100 V/40 ms), extending camera module lifetime. |
Use Scenario: Secondary-level ESD protection on VBUS line of USB-C receptacles in portable monitors and docking stations. IC Role / Device Role / Timing Role: Fast-response clamp between VBUS and GND, complementing primary TVS array near connector. Use Value: Delivers sub-1 ns response and 38.9 V clamping to prevent latch-up in USB PD controllers during ±15 kV contact discharge (IEC 61000-4-2). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-M3/61 | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in molding compound chemistry. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy (e.g., VW TL 813). | Choose SMAJ24CA-M3/61 if halogen-free material certification is required; otherwise SMAJ24CAHE3/61 offers identical performance with standard RoHS compliance. |
| SMBJ24CAHE3/61 | Same VWM, VBR, VC, and AEC-Q101 rating, but in larger SMB (DO-214AA) package with higher PPPM (600 W) and lower RθJA (90 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and may not fit space-constrained automotive modules. | Select SMBJ24CAHE3/61 only when 600 W surge rating or improved thermal dissipation is needed; SMAJ24CAHE3/61 remains optimal for size-constrained 24 V rail protection. |
Compared with SMAJ24CA-M3/61, SMAJ24CAHE3/61 provides identical protection performance with standard RoHS compliance, while SMBJ24CAHE3/61 trades compactness for higher surge capacity and better thermal management - making SMAJ24CAHE3/61 the balanced choice for space-limited automotive and industrial 24 V systems.
Availability
SMAJ24CAHE3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, camera power systems, and consumer USB-C power line protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ24CAHE3/61 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 validation, robust surge ratings, and SMT-compatible packaging for demanding 12 V/24 V systems.
FAQ
What is the clamping voltage of SMAJ24CAHE3/61 at its rated peak pulse current?
The SMAJ24CAHE3/61 has a maximum clamping voltage (VC) of 38.9 V at its peak pulse current (IPPM) of 10.3 A, measured using the standardized 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390) and reflects the actual voltage seen by downstream circuitry during a 400 W transient event. The SMAJ24CAHE3/61 maintains this clamping performance across its qualified temperature range and is validated for repeatable operation under 0.01% duty cycle conditions.
Is SMAJ24CAHE3/61 suitable for automotive applications?
Yes, SMAJ24CAHE3/61 is explicitly AEC-Q101 qualified per Vishay's documentation, making it suitable for automotive applications including body control modules, camera power supplies, and sensor interfaces. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and operation from –55 °C to +150 °C junction temperature - all requirements for under-hood and interior automotive use. The SMAJ24CAHE3/61 also meets UL 497B recognition and is rated for ISO 7637-2 and IEC 61000-4-5 surge immunity testing.
How does the bidirectional design of SMAJ24CAHE3/61 affect its circuit placement?
The bidirectional design of SMAJ24CAHE3/61 eliminates polarity constraints, allowing it to be placed across any two nodes requiring symmetrical transient suppression - such as differential signal pairs (e.g., CAN H/L), AC-coupled lines, or ungrounded power rails. Unlike unidirectional TVS diodes, SMAJ24CAHE3/61 has no cathode marking and functions identically in either orientation, simplifying layout, reducing BOM variants, and avoiding assembly errors. This symmetry is confirmed in Vishay's datasheet under "DEVICES FOR BIDIRECTION APPLICATIONS" and "Polarity" notes.
What is the standoff voltage (VWM) of SMAJ24CAHE3/61, and why is it important?
The standoff voltage (VWM) of SMAJ24CAHE3/61 is 24 V - the maximum continuous reverse voltage at which leakage remains below 1.0 μA. This parameter defines the upper limit of normal operating voltage before the device begins conducting significantly, ensuring no interference with 24 V nominal systems during steady-state operation. Selecting a VWM equal to the system rail (e.g., 24 V) maximizes noise margin while maintaining fast response to transients exceeding that threshold. The SMAJ24CAHE3/61's VWM is tightly controlled and verified per ANSI/IEEE C62.35 standards.
Does SMAJ24CAHE3/61 require heatsinking in typical applications?
No, SMAJ24CAHE3/61 does not require external heatsinking in typical surge-protection applications because its 400 W peak pulse power is non-repetitive and thermally limited by short-duration events (≤50 ms). Its RθJA of 120 °C/W is specified for mounting on 0.2" × 0.2" copper pads - sufficient for transient dissipation. Continuous power dissipation is limited to 3.3 W (PD), well below levels needing heatsinks. The SMAJ24CAHE3/61's thermal design assumes standard PCB copper area per Vishay's recommended pad layout, and no additional thermal management is needed for compliance with AEC-Q101 or IEC 61000-4-5 test profiles.
SMAJ24CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24CAHE3/61 FAQ
1.How can I place an order for SMAJ24CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHE3/61 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 SMAJ24CAHE3/61 reliable?
The price and inventory of SMAJ24CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHE3/61?
SMAJ24CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHE3/61 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 SMAJ24CAHE3/61?
For technical support, including SMAJ24CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ24CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHE3/61 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 SMAJ24CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHE3/61?
All SMAJ24CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHE3/61, 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 SMAJ24CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ24CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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