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Taiwan Semiconductor Corporation SMBJ40CAH
- Part No.:
- SMBJ40CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,396
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Product details
Overview
SMBJ40CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 40V working stand-off voltage (VWM), and 64.5V maximum clamping voltage (VC) at 9.7A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ40CAH datasheet, SMBJ40CAH pinout, SMBJ40CAH application, or SMBJ40CAH equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, sub-1ps response time, <1µA leakage above 10V, and compliance with automotive EFT immunity standards.
Technical Context
The SMBJ40CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. It delivers symmetrical breakdown behavior (VBR min/max = 44.4V / 49.1V at 1mA), operates across –55°C to +150°C junction temperature, and maintains stable clamping under 10/1000µs surge waveforms per ANSI/IEEE C62.35.
Its thermal design supports 10°C/W junction-to-case resistance and 55°C/W junction-to-ambient resistance, enabling reliable operation in high-density PCB layouts without forced airflow. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 44.4 V / 49.1 V @ 1 mA - Symmetrical breakdown threshold ensures equal protection in both polarities |
| VC @ IPP | 64.5 V @ 9.7 A - Clamping voltage limits downstream IC stress during 10/1000µs transients |
| PPK | 600 W - Peak pulse power handling capability per single non-repetitive event |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on systems |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD and EFT events before damage occurs |
| TJ max | +150 °C - Supports under-hood automotive environments and industrial motor drive applications |
Pinout & Package
DO-214AA (SMB) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band marking for polarity identification (bidirectional use requires no orientation dependency).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Identical electrical behavior in either direction - no polarity-sensitive placement required on PCB |
| Case (cathode band side) | Reference terminal for mounting | Thermal path to PCB copper; band indicates conventional cathode side for unidirectional variants only |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock testing |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) waveforms |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress |
| Moisture sensitivity Level 1 | Enables standard SMT reflow without baking or dry-pack requirements |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V/24V battery rail in engine control units exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤64.5V during ISO 7637-2 Pulse 1 (–150V/0.5Ω), preventing latch-up or gate oxide rupture in downstream ICs. | Use Scenario: RS-485/RS-232 data lines in factory automation PLCs subjected to EFT bursts. IC Role / Device Role / Timing Role: Bidirectional shunt protector across differential signal pairs. Use Value: Clamps common-mode surges to <65V within <1ps, preserving signal integrity while meeting IEC 61000-4-4 Level 4 immunity. |
| LED Lighting Driver Protection | Automotive CAN Bus Transceiver Protection |
Use Scenario: Constant-current LED driver input stage in headlamp modules experiencing switching noise and hot-swap events. IC Role / Device Role / Timing Role: Standoff protector parallel to input capacitor, absorbing repetitive 10/1000µs spikes. Use Value: Withstands ≥1000 surges at 9.7A without degradation due to low RθJC (10°C/W) and robust junction construction. | Use Scenario: CAN_H/CAN_L lines in body control modules exposed to coupled transients from adjacent power circuits. IC Role / Device Role / Timing Role: Low-capacitance (typ. 150pF @ 0V) bidirectional clamp on each bus line. Use Value: Maintains CAN signal rise/fall times intact while limiting bus voltage to ±64.5V during ESD or load dump coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40CA | Same DO-214AC (SMA) package; 600W rating; VBR = 44.4–49.1V; VC = 64.5V @ 9.7A; slightly higher RθJA (65°C/W) | Compatible in space-constrained designs but lower thermal efficiency than SMBJ40CAH's DO-214AA package | Select when existing footprint uses SMA; verify layout thermal relief matches SMBJ40CAH's lower RθJA |
| ON Semiconductor SMCJ40CA | DO-214AB (SMC) package; 1500W rating; VBR = 44.4–49.1V; VC = 64.5V @ 23.5A; larger footprint and higher cost | Used where higher surge margin is needed beyond 600W, e.g., heavy-duty truck battery systems | Choose only if system-level surge testing exceeds 600W; otherwise SMBJ40CAH offers optimal size/power balance |
Compared with SMAJ40CA and SMCJ40CA, the SMBJ40CAH delivers identical electrical clamping performance in a thermally superior DO-214AA package - offering better power density and AEC-Q101 validation for automotive ECUs without requiring PCB redesign.
Availability
SMBJ40CAH is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor interfaces, LED lighting drivers, and CAN bus protection requiring stable component supply across extended production lifecycles.
Supply support for SMBJ40CAH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive and industrial transient suppression, emphasizing robustness under ISO 7637-2 stress, low leakage, and high-volume SMT manufacturability.
FAQ
What does the 'CAH' suffix indicate in SMBJ40CAH?
The 'CAH' suffix in SMBJ40CAH denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and high-reliability construction (H). This distinguishes it from unidirectional variants (e.g., SMBJ40H) and non-automotive grades. The SMBJ40CAH provides symmetrical clamping in both voltage polarities, making it suitable for AC-coupled or floating signal lines where polarity cannot be guaranteed.
Is SMBJ40CAH compatible with lead-free reflow soldering processes?
Yes, SMBJ40CAH is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020 Level 1), featuring matte tin-plated leads and a UL 94V-0 molding compound. Its moisture sensitivity level is rated at Level 1, eliminating the need for pre-baking or dry-pack handling prior to SMT assembly - supporting high-yield, high-throughput manufacturing.
How does SMBJ40CAH perform under repeated transient stress?
SMBJ40CAH is characterized for non-repetitive 10/1000µs surges per ANSI/IEEE C62.35, but real-world testing shows >1000 cycles at rated IPP (9.7A) with <5% parameter shift when derated per Figure 2 of the datasheet. Its glass-passivated junction and low thermal resistance (RθJC = 10°C/W) enable consistent clamping performance across thermal cycles in automotive under-hood environments.
Does SMBJ40CAH meet ISO 16750-2 for automotive environmental stress?
SMBJ40CAH is explicitly validated to ISO 7637-2 (Pulse 1/2a/2b/3a/3b) and AEC-Q101, which cover the core electrical transient requirements of ISO 16750-2. While ISO 16750-2 also includes temperature, vibration, and corrosion tests, those apply to full modules - not discrete components. As a qualified discrete TVS, SMBJ40CAH satisfies the electrical immunity portion essential for ISO 16750-2 compliance in automotive ECUs.
What is the typical junction capacitance of SMBJ40CAH at zero bias?
The typical junction capacitance of SMBJ40CAH is 150 pF at 0 V bias and 1 MHz, as derived from the family's Fig.5 characteristic curve (CJ vs. VBR). This value supports high-speed data line protection (e.g., CAN, LIN) without distorting signal edges, though designers should verify timing margins in their specific 120Ω differential impedance environment.
SMBJ40CAH 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.7A
- 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)
SMBJ40CAH FAQ
1.How can I place an order for SMBJ40CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAH 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 SMBJ40CAH reliable?
The price and inventory of SMBJ40CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CAH is usually 5 days.
3.What payment methods are accepted for SMBJ40CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAH?
SMBJ40CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAH 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 SMBJ40CAH?
For technical support, including SMBJ40CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAH requirements.
6.How does Aetrix verify that SMBJ40CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAH 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 SMBJ40CAH meets industry standards.
7.What is the process for return or replacement of SMBJ40CAH?
All SMBJ40CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAH, 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 SMBJ40CAH part is unused and in its original packaging.
Return procedure for SMBJ40CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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