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Vishay General Semiconductor - Diodes Division SMCJ24CAHE3/57T
- Part No.:
- SMCJ24CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CAHE3/57T.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,666
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Product details
Overview
SMCJ24CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 24 V standoff voltage (VWM), 38.9 V maximum clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), making it suitable for automotive power line surge suppression per ISO 7637-2.
For engineers reviewing the SMCJ24CAHE3/57T datasheet, SMCJ24CAHE3/57T pinout, SMCJ24CAHE3/57T application, or SMCJ24CAHE3/57T equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low thermal resistance (RθJL = 15 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ24CAHE3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities due to its bidirectional construction. Its breakdown voltage (VBR) is specified between 26.7 V and 29.5 V at 1.0 mA test current, with temperature coefficient of +0.096 %/°C - enabling predictable derating across -55 °C to +150 °C operating range.
It meets J-STD-020 MSL Level 1 moisture sensitivity, supports lead-free reflow up to 260 °C peak, and exhibits low incremental surge resistance for minimal voltage overshoot during fast transients (e.g., ISO 16750-2 load dump). The device is rated for non-repetitive 200 A surge (8.3 ms half-sine) only in unidirectional variants - not applicable to this CA suffix part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 26.7 V / 29.5 V at IT = 1.0 mA - Ensures reliable avalanche initiation within tight tolerance band for consistent protection threshold. |
| VC @ IPPM | 38.9 V at 38.6 A (10/1000 µs) - Clamped voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| PPPM | 1500 W - Peak transient energy handling capacity; enables compliance with ISO 7637-2 Pulse 1, 2a, 3a/b, and 5a. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive environments without derating penalties. |
| RθJL | 15 °C/W - Low junction-to-lead thermal resistance; allows efficient heat transfer to PCB copper, critical for repeated surge events. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking - bidirectional operation eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; symmetric conduction path ensures identical clamping in both directions. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; no functional distinction - device mounts without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, LIN, sensor differential pairs) without polarity concerns. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules where field failure risk must be minimized. |
| Glass-passivated junction | Provides stable leakage performance (<1.0 µA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1 rating | Permits unlimited floor life and standard reflow profiles without baking - reduces manufacturing overhead in high-volume SMT lines. |
| UL 497B recognition | Confirms compliance with telecom and industrial surge protection safety standards (File E136766), easing regulatory certification. |
Applications
| Automotive Power Line Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump (ISO 16750-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point, shunting >100 V transients to ground before reaching regulator ICs. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤38.9 V, preventing latch-up or gate oxide damage during 120 V/100 ms events. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044) from ESD and coupled noise on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair, absorbing ±30 kV contact ESD (IEC 61000-4-2) and common-mode surges. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while adding <1 pF junction capacitance at zero bias - no data rate degradation. |
| Industrial Sensor Interface Protection | Telecom DC Power Input Protection |
|
Use Scenario: Shielding 4–20 mA loop-powered pressure/temperature sensors from induced lightning surges in factory automation cabinets. IC Role / Device Role / Timing Role: Connected between loop supply and sensor input terminals, acting as fail-safe crowbar during >1 kV ring wave transients (IEC 61000-4-5). Use Value: Withstands 1500 W peak pulses without degradation, ensuring sensor uptime in harsh electromagnetic environments like motor drives and welding equipment. |
Use Scenario: Securing -48 V DC telecom rectifier outputs against accidental AC mains coupling and lightning-induced surges on central office distribution panels. IC Role / Device Role / Timing Role: Mounted across output rails upstream of DC/DC converters, clamping negative-going transients to protect secondary-side MOSFETs and controllers. Use Value: Symmetrical 24 V standoff and 38.9 V clamping enable protection of both positive and negative rail transients without polarity reversal concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC24CA | Lower PPPM (600 W), same VWM/VC, smaller SMA package (DO-214AC) | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a | Select when board space is constrained and surge energy requirements are ≤600 W. |
| SMCJ24AHE3/57T | Unidirectional variant; identical VWM, VBR, VC, but asymmetric clamping (only protects negative transients) | Requires external polarity management (e.g., series diode) for AC or bidirectional signals; not drop-in for CA designs | Choose only for dedicated negative-rail protection where polarity is fixed and cost is prioritized over flexibility. |
Compared with SAC24CA and SMCJ24AHE3/57T, the SMCJ24CAHE3/57T uniquely delivers full 1500 W bidirectional clamping in automotive-qualified SMC packaging - essential for protecting dual-polarity interfaces like CAN, LIN, and isolated sensor bridges without redesigning layout or adding components.
Availability
SMCJ24CAHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 traceability and RoHS compliance.
Supply support for SMCJ24CAHE3/57T 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments, emphasizing AEC-Q101 qualification, low clamping ratio, and robust thermal performance in surface-mount packages.
FAQ
What does the "CA" suffix mean in SMCJ24CAHE3/57T?
The "CA" suffix denotes a bidirectional configuration - meaning the SMCJ24CAHE3/57T provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional "A" variants, it has no cathode marking and functions identically regardless of voltage polarity applied across its terminals, making it ideal for AC-coupled or floating signal lines such as CAN bus or differential sensor interfaces.
Is SMCJ24CAHE3/57T qualified for automotive use?
Yes, the SMCJ24CAHE3/57T is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code "HE3". This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and human-body-model ESD (≥8 kV contact). It is approved for use in automotive powertrain, chassis, and body electronics where reliability under thermal and electrical stress is mission-critical.
What is the maximum clamping voltage of SMCJ24CAHE3/57T during a surge event?
The SMCJ24CAHE3/57T has a maximum clamping voltage (VC) of 38.9 V at 38.6 A peak pulse current (IPPM) under the standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage that will appear across the protected circuit during worst-case transient conditions, ensuring downstream components like 3.3 V or 5 V regulators remain within safe operating limits when used with appropriate series impedance.
How does the SMCJ24CAHE3/57T differ from the unidirectional SMCJ24AHE3/57T?
The SMCJ24CAHE3/57T is bidirectional with symmetrical clamping behavior, while the SMCJ24AHE3/57T is unidirectional and only clamps negative-going transients (with cathode marked). Their VWM, VBR, and VC values are nearly identical, but the CA version supports AC or floating applications without polarity constraints - whereas the A version requires correct orientation and cannot protect positive surges unless paired with additional components. They are not pin-compatible replacements.
What PCB layout guidance applies to SMCJ24CAHE3/57T for optimal surge performance?
For optimal surge handling, mount the SMCJ24CAHE3/57T with minimum trace length between its terminals and the protected node and system ground. Vishay specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W performance. Avoid thermal reliefs on pads; use solid copper pours connected to internal ground planes via multiple vias to minimize inductance and maximize heat dissipation during repetitive surges.
SMCJ24CAHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 38.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ24CAHE3/57T FAQ
1.How can I place an order for SMCJ24CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CAHE3/57T 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 SMCJ24CAHE3/57T reliable?
The price and inventory of SMCJ24CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ24CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CAHE3/57T?
SMCJ24CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CAHE3/57T 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 SMCJ24CAHE3/57T?
For technical support, including SMCJ24CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ24CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ24CAHE3/57T 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 SMCJ24CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ24CAHE3/57T?
All SMCJ24CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CAHE3/57T, 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 SMCJ24CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ24CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24CAHE3/57T Tags
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