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Taiwan Semiconductor Corporation SMB10J40AH
- Part No.:
- SMB10J40AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J40AH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,892
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Product details
Overview
SMB10J40AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode with 40V standoff voltage, 44.4–49.1V breakdown range, and 64.5V clamping voltage at 15.5A peak pulse current; designed for automotive-grade ESD and load-dump protection in lighting control and power supply input stages.
For engineers reviewing the SMB10J40AH datasheet, SMB10J40AH pinout, SMB10J40AH application, or SMB10J40AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AA (SMB) package compatibility, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and 1.0ps typical response time under transient stress.
Technical Context
The SMB10J40AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to deliver fast transient suppression with sub-nanosecond response. Its clamping behavior is defined by a 64.5V maximum VC at IPPM = 15.5A under 10/1000μs waveform, and it sustains 1000W peak pulse power at TA = 25°C.
Thermally, it features RθJL = 20°C/W and RθJA = 100°C/W, enabling reliable operation up to TJ = +175°C. It supports automated SMT placement, meets JESD201 Class 2 whisker resistance, and carries RoHS/halogen-free compliance per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown voltage range at IT = 1 mA; defines turn-on threshold consistency |
| VC @ IPPM | 64.5 V - Clamping voltage at 15.5 A peak pulse; determines protected circuit's max transient exposure |
| PPK | 1000 W - Peak pulse power handling per 1 ms non-repetitive surge (10/1000 μs waveform) |
| TJ max | +175 °C - Maximum junction temperature; enables use in under-hood automotive environments |
| Response time | <1.0 ps - Typical avalanche response; ensures suppression before sensitive ICs experience overstress |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking and 0.110 g mass |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; lead finish solderable per J-STD-002, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or low-impedance return path during clamping; defines unidirectional conduction direction |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 12V rail); avalanche breakdown occurs when voltage exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal cycling and humidity |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance transients) |
| Low-profile SMB package | Enables high-density PCB layout in space-constrained modules such as LED drivers and body control units |
| J-STD-020 Level 1 MSL | Allows unlimited floor life and reflow without baking; simplifies SMT manufacturing flow |
Applications
| Automotive Lighting Control | Industrial Power Supply Input |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients during vehicle battery disconnect/reconnect events. IC Role / Device Role: Unidirectional TVS placed between 12V rail and ground to clamp surges above 40V. Use Value: Limits peak voltage to 64.5V at 15.5A, preventing damage to 45V-rated MOSFETs and gate drivers in headlight modules. | Use Scenario: Safeguarding AC-DC converter primary-side controllers against line-induced fast transients. IC Role / Device Role: Parallel-connected TVS on DC bus input to absorb 1000W pulses per ISO 7637-2 Pulse 1. Use Value: Maintains system uptime by suppressing >100V spikes within 1ps, avoiding controller latch-up or overvoltage shutdown. |
| Automotive Body Control Module (BCM) | Smart Sensor Interface Protection |
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from ESD and switching noise in door module PCBs. IC Role / Device Role: Localized TVS on each protected signal line, grounded via short trace to minimize inductance. Use Value: Achieves <1.0ps response and <10 µA IR at 40V, preserving signal integrity while meeting IEC 61000-4-2 Level 4 (±15 kV contact). | Use Scenario: Protecting analog front-end inputs of automotive radar or camera sensors from cable discharge events. IC Role / Device Role: Low-leakage unidirectional TVS placed directly at connector interface before ESD filter network. Use Value: Delivers 64.5V clamping with 1 µA max leakage at VWM, ensuring minimal offset error in precision ADC reference paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A | Same DO-214AA package; 40V VWM, but 64.5V VC @ 15.5A - identical clamping performance; lower PPK (600W vs. 1000W) | Not rated for ISO 7637-2 Pulse 1; limited to lower-energy transients like ESD or EFT | Select SMB10J40AH when full automotive load-dump immunity (1000W, Pulse 1) is required. |
| SMCJ40A | Larger DO-214AB (SMC) package; same 40V VWM and 64.5V VC, but higher PPK (1500W); RθJA = 35°C/W vs. 100°C/W | Better thermal dissipation in high-ambient environments; requires larger PCB footprint | Choose SMB10J40AH for space-constrained SMT layouts where 1000W rating suffices and SMB footprint is mandated. |
Compared with SMBJ40A and SMCJ40A, the SMB10J40AH uniquely balances 1000W surge capability, AEC-Q101 qualification, and DO-214AA footprint-making it optimal for automotive modules needing robust transient immunity without board area penalty.
Availability
SMB10J40AH is available at Aetrix Electronics and suitable for automotive lighting systems, industrial power supply inputs, and body control modules requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMB10J40AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMB10JxxAH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for automotive-grade transient immunity in 12V/24V systems with stringent thermal and reliability demands.
FAQ
What is the polarity configuration of SMB10J40AH?
The SMB10J40AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package. It conducts in reverse bias above VBR and blocks forward current up to VF = 3.5V at 50A. This configuration makes SMB10J40AH suitable for DC rail protection where polarity is fixed, unlike bidirectional variants (e.g., SMB10J40CAH) used in AC or floating lines.
Does SMB10J40AH meet automotive qualification standards?
Yes, SMB10J40AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1 (load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance transients). Its construction-including glass-passivated junction, JESD201 Class 2 whisker resistance, and MSL Level 1-supports deployment in under-hood and cabin automotive ECUs without derating.
What is the maximum clamping voltage of SMB10J40AH under surge conditions?
The SMB10J40AH has a maximum clamping voltage (VC) of 64.5V at 15.5A peak pulse current (IPPM), measured under the standard 10/1000μs waveform. This value is guaranteed across temperature and ensures protected downstream components see no more than 64.5V during a 1000W transient event, provided layout minimizes parasitic inductance.
Can SMB10J40AH be used in bidirectional signal lines?
No-SMB10J40AH is unidirectional and must not be used on AC or bidirectional data lines without external circuitry. For such applications, the pin-compatible SMB10J40CAH variant (with CAH suffix) provides symmetrical clamping in both polarities. Using SMB10J40AH in bidirectional mode risks forward conduction and failure during negative transients.
What is the thermal resistance profile of SMB10J40AH?
SMB10J40AH has a junction-to-lead thermal resistance (RθJL) of 20°C/W and junction-to-ambient resistance (RθJA) of 100°C/W under standard JEDEC test conditions. These values assume proper PCB copper pour and solder joint quality; actual RθJA will improve with ≥1 sq-in. 2-oz copper pad, enabling sustained operation near TJ = +175°C in compact automotive modules.
SMB10J40AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMB10J40AH FAQ
1.How can I place an order for SMB10J40AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J40AH 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 SMB10J40AH reliable?
The price and inventory of SMB10J40AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J40AH is usually 5 days.
3.What payment methods are accepted for SMB10J40AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J40AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J40AH?
SMB10J40AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J40AH 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 SMB10J40AH?
For technical support, including SMB10J40AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J40AH requirements.
6.How does Aetrix verify that SMB10J40AH is sourced from the original manufacturer or authorized distributors?
All SMB10J40AH 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 SMB10J40AH meets industry standards.
7.What is the process for return or replacement of SMB10J40AH?
All SMB10J40AH units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J40AH, 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 SMB10J40AH part is unused and in its original packaging.
Return procedure for SMB10J40AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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