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Taiwan Semiconductor Corporation SMBJ24CAH
- Part No.:
- SMBJ24CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CAH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,995
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Product details
Overview
SMBJ24CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 24 V working stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR), 38.9 V maximum clamping voltage (VC) at 16.0 A peak pulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ24CAH datasheet, SMBJ24CAH pinout, SMBJ24CAH application, or SMBJ24CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA at 24 V), and DO-214AA thermal performance (RθJA = 55 °C/W).
Technical Context
The SMBJ24CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its unidirectional counterpart uses a cathode band marking; SMBJ24CAH omits this band to indicate symmetrical bipolar operation, enabling protection without polarity sensitivity.
It operates across –55 °C to +150 °C junction temperature range, supports 10/1000 µs surge waveforms per ANSI/IEEE C62.35, and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for lead-free reflow and automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on before system damage |
| VC @ IPP | 38.9 V @ 16.0 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak non-repetitive surge power handling per single event |
| IR @ VWM | <1 µA - Minimal leakage current preserves battery life and signal integrity in always-on circuits |
| TJ max | +150 °C - Enables operation in engine control units and power converters with high ambient heat |
| RθJA | 55 °C/W - Thermal resistance defining PCB copper area requirements for sustained 3 W steady-state dissipation |
Pinout & Package
DO-214AA (SMB) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and polarity-indifferent terminal configuration for bidirectional use. Cathode band omitted per marking convention for CAH-series bipolar devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | No polarity marking; terminals interchangeable - enables placement without orientation check in automated assembly |
| Case (body) | Thermal interface | Exposed copper pad contact recommended per suggested PCB layout to achieve rated RθJA of 55 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD - eliminates need for additional qualification |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives - critical for under-hood applications |
| Sub-1 ps response time | Clamps ESD events before propagation into sensitive analog or communication circuitry - protects CAN, LIN, and sensor interfaces |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life compliance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery line in engine control module exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed upstream of LDOs and microcontrollers to clamp surges before regulation stage. Use Value: Limits transient voltage to ≤38.9 V during 16 A pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. | Use Scenario: 4–20 mA current loop input of PLC analog input card subjected to field wiring ESD. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt fast transients before precision op-amp front-end. Use Value: Sub-1 ps response ensures clamping occurs prior to op-amp overvoltage saturation, preserving measurement accuracy. |
| LED Lighting Driver Protection | Automotive CAN Bus Node Protection |
Use Scenario: Constant-current LED driver IC powered from 24 V supply in commercial vehicle lighting. IC Role / Device Role / Timing Role: TVS on input rail to absorb inductive kickback from relay-controlled loads sharing same harness. Use Value: 600 W peak power rating handles repetitive switching surges without thermal runaway or parameter shift. | Use Scenario: CAN transceiver (e.g., TJA1042) in body control module connected to chassis-wired bus. IC Role / Device Role / Timing Role: Bidirectional TVS across CAN_H/CAN_L differential pair to suppress common-mode transients. Use Value: Symmetrical clamping maintains differential integrity while limiting common-mode voltage to safe levels per ISO 11898-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Same VWM/VBR/VC specs but not AEC-Q101 qualified; lacks ISO 7637-2 validation | Restricted to non-automotive industrial or consumer use where automotive qualification is unnecessary | Select SMBJ24CA only when cost sensitivity outweighs automotive reliability requirements |
| SAC24 | Same DO-214AA package but lower PPK (400 W); higher VC (43.0 V @ 12.5 A) | Less robust against high-energy load dump; suitable for lower-risk 12 V subsystems only | Choose SAC24 only if system-level testing confirms 400 W surge margin is sufficient |
Compared with SMBJ24CA and SAC24, SMBJ24CAH delivers certified automotive-grade immunity (AEC-Q101 + ISO 7637-2), tighter clamping (38.9 V), and full 600 W surge capacity - making it the sole choice for safety-critical 24 V power domains requiring zero-layout redesign.
Availability
SMBJ24CAH is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, LED driver protection, and CAN/LIN bus node hardening requiring stable component supply across extended production lifecycles.
Supply support for SMBJ24CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMBJH series was engineered specifically for AEC-Q101-compliant transient protection in harsh automotive environments - emphasizing robustness, repeatable clamping, and compatibility with modern lead-free SMT processes.
FAQ
What is the maximum clamping voltage of SMBJ24CAH under standard 10/1000 µs surge conditions?
The SMBJ24CAH has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 16.0 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable voltage limiting during real-world transients such as load dump or ESD events. The SMBJ24CAH's clamping performance remains stable across its full operating temperature range (–55 °C to +150 °C).
Is SMBJ24CAH suitable for protecting CAN FD interfaces operating at 5 Mbps?
Yes, SMBJ24CAH is suitable for CAN FD interface protection due to its sub-1 ps response time and low junction capacitance (typically <100 pF at 0 V, per Fig.5). Its bidirectional symmetry ensures equal clamping on both CAN_H and CAN_L lines without skew, preserving signal integrity at 5 Mbps. The SMBJ24CAH's 38.9 V clamping level prevents transceiver damage while staying well below the absolute maximum ratings of compliant CAN FD transceivers like TCAN1042.
How does SMBJ24CAH differ from SMBJ24AH in terms of electrical behavior and application scope?
SMBJ24CAH is bidirectional (CAH suffix), whereas SMBJ24AH is unidirectional (AH suffix) with a cathode band marking. Electrically, SMBJ24CAH clamps symmetrically in both polarities, making it ideal for AC-coupled or differential lines like CAN or RS-485; SMBJ24AH only protects against positive transients relative to ground. The SMBJ24CAH also carries AEC-Q101 and ISO 7637-2 certifications that SMBJ24AH does not explicitly claim in its datasheet revision.
Does SMBJ24CAH require derating at elevated ambient temperatures, and if so, how much?
Yes, SMBJ24CAH requires thermal derating above TA = 25 °C, per Figure 2 in the datasheet. Its peak pulse power (PPK) decreases linearly: at 75 °C ambient, PPK is reduced to ~70% (420 W); at 125 °C, it drops to ~30% (180 W). This derating is essential for sustained surge events in under-hood applications. The SMBJ24CAH's RθJA of 55 °C/W means PCB copper area directly impacts achievable derating margin.
Can SMBJ24CAH be used in parallel to increase surge current handling capacity?
No - SMBJ24CAH should not be paralleled without external balancing resistors, as minor VBR tolerances (26.7–29.5 V) cause uneven current sharing during surges, risking thermal runaway in one device. For higher IPP, select a higher-rated part (e.g., 1.5KE24CA) or verify matched-bin pairing with <1% VBR spread. The SMBJ24CAH's design assumes single-device implementation per protected node.
SMBJ24CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 16A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ24CAH FAQ
1.How can I place an order for SMBJ24CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CAH 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 SMBJ24CAH reliable?
The price and inventory of SMBJ24CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24CAH is usually 5 days.
3.What payment methods are accepted for SMBJ24CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CAH?
SMBJ24CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CAH 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 SMBJ24CAH?
For technical support, including SMBJ24CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CAH requirements.
6.How does Aetrix verify that SMBJ24CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ24CAH 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 SMBJ24CAH meets industry standards.
7.What is the process for return or replacement of SMBJ24CAH?
All SMBJ24CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CAH, 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 SMBJ24CAH part is unused and in its original packaging.
Return procedure for SMBJ24CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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