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Taiwan Semiconductor Corporation SMB10J40CAH
- Part No.:
- SMB10J40CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J40CAH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
SMB10J40CAH from Taiwan Semiconductor is a bidirectional 40 V stand-off transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000 W peak pulse power, 64.5 V maximum clamping voltage at 15.5 A, and AEC-Q101 qualified for automotive electronics protection against ISO 7637-2 pulses.
For engineers reviewing the SMB10J40CAH datasheet, SMB10J40CAH pinout, SMB10J40CAH application, or SMB10J40CAH equivalent, key selection criteria include bidirectional clamping capability, 175 °C junction temperature rating, low-profile surface-mount packaging, and compliance with automotive ESD/EMI immunity standards.
Technical Context
The SMB10J40CAH is a unidirectional/bidirectional TVS diode configured as a single die in a glass-passivated junction structure, enabling sub-1 ps response time and stable clamping under repetitive transients. Its bipolar construction supports symmetrical reverse/forward surge suppression without polarity dependency.
It operates across -55 °C to +175 °C junction temperature range, with 20 °C/W junction-to-lead thermal resistance and 100 °C/W junction-to-ambient rating. The device meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test profiles and is moisture-sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V - Breakdown voltage range at 1 mA test current, defining turn-on threshold consistency |
| VC | 64.5 V - Clamping voltage at 15.5 A peak pulse current, limiting downstream voltage stress |
| PPK | 1000 W - Peak pulse power handling for 1 ms 10/1000 µs waveform, critical for load dump survival |
| IPPM | 15.5 A - Maximum non-repetitive peak pulse current supported at rated clamping voltage |
| TJ max | +175 °C - Maximum junction temperature enabling under-hood automotive deployment |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance supporting PCB copper pour heat sinking |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, low-profile plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, and cathode band marking for unidirectional variants (bidirectional SMB10J40CAH has no polarity marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity dependence - either terminal serves as input/output for surge current in either direction |
| Case (body) | Thermal and mechanical interface | DO-214AA body provides primary heat path to PCB copper; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive under-hood applications including temperature cycling and humidity exposure |
| Glass-passivated junction | Enhanced long-term stability and leakage control over life, especially at high temperature/humidity |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guaranteed suppression of real-world automotive transients including load dump and inductive switching noise |
| Sub-1 ps response time | Clamps before sensitive ICs experience overvoltage, protecting gate oxides and I/O structures |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow, enabling direct placement into standard SMT lines |
Applications
| Automotive Lighting Systems | Infotainment Power Rails |
|---|---|
Use Scenario: Protecting LED driver ICs and CAN transceivers from load dump and alternator ripple in headlamp modules. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at power entry point upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤64.5 V during 1000 W transients, preventing latch-up and permanent damage to 5 V/3.3 V logic rails. | Use Scenario: Safeguarding USB-C PD controllers and display timing ICs against ESD and fast transients on vehicle battery-supplied 12 V inputs. IC Role / Device Role / Timing Role: Primary front-end TVS on main power rail, coordinated with secondary local decoupling and filtering. Use Value: Sub-1 ps response ensures clamping occurs before ESD-induced edge rates propagate into high-speed data interfaces. |
| Engine Control Unit (ECU) Sensors | Body Control Module (BCM) Actuators |
Use Scenario: Shielding analog sensor signal conditioning circuits (e.g., MAP, O2 sensors) from coupled ignition noise and relay switching spikes. IC Role / Device Role / Timing Role: Low-leakage (<1 µA @ 40 V) bidirectional clamp on sensor supply and output lines. Use Value: Maintains signal integrity by suppressing transients up to ±64.5 V while adding negligible offset or drift to mV-level sensor outputs. | Use Scenario: Protecting H-bridge gate drivers and LIN transceivers from inductive kickback when controlling door locks, mirrors, and window motors. IC Role / Device Role / Timing Role: Secondary-level TVS on motor drive outputs and communication buses, complementing primary battery rail protection. Use Value: Withstands 100 A surge current (IFSM) and clamps at 64.5 V, preventing MOSFET avalanche failure and bus lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40CA | Same DO-214AC (SMA) package; 64.5 V clamping at 15.4 A; 1000 W rating; AEC-Q101 qualified | Smaller footprint (SMA vs SMB) reduces board area but lowers thermal mass and power derating margin above 25°C | Select SMAJ40CA only if layout space is constrained and thermal management via copper pour is limited |
| ON Semiconductor 1.5KE40CA | Through-hole DO-15 package; same 40 V VWM, 64.5 V VC; 1500 W rating; not AEC-Q101 qualified | Requires wave soldering or hand assembly; unsuitable for automated SMT lines or automotive vibration environments | Choose 1.5KE40CA only for cost-sensitive industrial prototypes where AEC-Q101 and SMT are not required |
Compared with SMAJ40CA and 1.5KE40CA, SMB10J40CAH offers optimal balance of AEC-Q101 compliance, SMB package thermal performance (20 °C/W RθJL), and full ISO 7637-2 coverage - making it the preferred choice for production automotive ECUs and lighting modules.
Availability
SMB10J40CAH is available at Aetrix Electronics and suitable for automotive lighting systems, infotainment power rails, and engine control unit (ECU) sensor protection requiring stable component supply, AEC-Q101 traceability, and ISO 7637-2 compliance.
Supply support for SMB10J40CAH 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 automotive-qualified components since 1979.
The SMB10J40CAH belongs to TSC's AEC-Q101-qualified SMB-series TVS family, engineered specifically for robust transient suppression in automotive power distribution networks and electronic control units.
FAQ
What does the 'CAH' suffix indicate in SMB10J40CAH?
The 'CAH' suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. 'C' = bidirectional, 'A' = AEC-Q101 qualified, 'H' = halogen-free per IEC 61249-2-21. This distinguishes SMB10J40CAH from unidirectional SMB10J40AH and confirms its suitability for symmetric surge protection in automotive signal and power lines.
Is SMB10J40CAH compatible with lead-free reflow soldering processes?
Yes, SMB10J40CAH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its DO-214AA package is rated for peak reflow temperatures up to 260 °C. Moisture sensitivity level 1 eliminates pre-bake requirements, allowing direct placement into standard J-STD-020-compliant SMT lines.
What is the maximum clamping voltage of SMB10J40CAH and at what current is it specified?
The maximum clamping voltage (VC) of SMB10J40CAH is 64.5 V, measured at a peak pulse current (IPPM) of 15.5 A under the 10/1000 µs waveform condition. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Does SMB10J40CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
No, SMB10J40CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b - but not Pulse 5a (load dump), which requires higher energy handling (typically >1000 W sustained). For Pulse 5a, designers must pair SMB10J40CAH with a dedicated load dump suppressor (e.g., TVS + varistor or active clamp) or select a higher-energy device such as SMB15J40CAH.
How does the thermal performance of SMB10J40CAH compare to similar SMB-package TVS diodes?
SMB10J40CAH achieves a junction-to-lead thermal resistance (RθJL) of 20 °C/W, matching industry-leading SMB TVS devices. This enables effective heat transfer to PCB copper, supporting higher average power dissipation than competitors with RθJL > 25 °C/W. Its 100 °C/W RθJA reflects typical board-level performance with 1-inch² 2-oz copper pad.
SMB10J40CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMB10J
- 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):
- 15.5A
- Power - Peak Pulse:
- 1000W (1kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB10J40CAH FAQ
1.How can I place an order for SMB10J40CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J40CAH 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 SMB10J40CAH reliable?
The price and inventory of SMB10J40CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J40CAH is usually 5 days.
3.What payment methods are accepted for SMB10J40CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J40CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J40CAH?
SMB10J40CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J40CAH 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 SMB10J40CAH?
For technical support, including SMB10J40CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J40CAH requirements.
6.How does Aetrix verify that SMB10J40CAH is sourced from the original manufacturer or authorized distributors?
All SMB10J40CAH 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 SMB10J40CAH meets industry standards.
7.What is the process for return or replacement of SMB10J40CAH?
All SMB10J40CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J40CAH, 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 SMB10J40CAH part is unused and in its original packaging.
Return procedure for SMB10J40CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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