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Taiwan Semiconductor Corporation SMB10J18AH
- Part No.:
- SMB10J18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J18AH.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
SMB10J18AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode with a standoff voltage of 18 V, breakdown voltage range of 20.0–22.1 V at 1 mA, and clamping voltage of 29.2 V at 34.2 A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial circuit protection against ISO 7637-2 pulses in power supply and signal line applications.
For engineers reviewing the SMB10J18AH datasheet, SMB10J18AH pinout, SMB10J18AH application, or SMB10J18AH equivalent, key selection factors include its DO-214AA (SMB) package, unidirectional polarity, 175 °C max junction temperature, and compliance with automotive transients (Pulse 1/2a/2b/3a/3b).
Technical Context
The SMB10J18AH uses a glass-passivated silicon junction to achieve fast response time (<1.0 ps) and stable clamping under repetitive or single high-energy transients. Its thermal design supports 20 °C/W junction-to-lead resistance and operates across –55 °C to +175 °C ambient range.
It is rated for 1000 W peak pulse power (tp = 1 ms), 5 W steady-state power dissipation, and withstands 100 A non-repetitive forward surge (8.3 ms half-sine). The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0–22.1 V @ 1 mA - Ensures reliable breakdown activation above normal operating voltage |
| VC @ IPPM | 29.2 V @ 34.2 A - Clamped voltage during 1000 W transient, limiting stress on downstream ICs |
| PPK | 1000 W - Peak pulse power handling per 1 ms waveform (Fig. 3), critical for ISO 7637-2 Pulse 1/2a/2b |
| TJ max | +175 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures |
| Package | DO-214AA (SMB) - Surface-mount footprint compatible with automated placement and reflow soldering |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.110 g weight, UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal (forward direction) | Connected to lower-potential side of protected line; enables unidirectional clamping to ground |
| Cathode | Current exit terminal / clamping node | Connected to protected IC input or power rail; conducts surge current to ground when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including engine control, body modules, and lighting systems |
| Glass-passivated junction | Enhances long-term stability and leakage performance over temperature and lifetime vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Directly protects against real-world automotive load-dump and inductive-switching transients without external filtering |
| Moisture Sensitivity Level 1 | Eliminates bake requirements prior to SMT assembly, reducing manufacturing cost and process complexity |
Applications
| Automotive Power Line Protection | LED Lighting Driver Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges exceeding 18 V. Use Value: Limits voltage to ≤29.2 V during 1000 W transients, preventing damage to MCU, CAN transceivers, and PMICs. | Use Scenario: Safeguarding constant-current LED drivers from ESD and switching spikes in headlamp modules. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing fast transients induced by relay or MOSFET switching. Use Value: Sub-1 ps response ensures clamping before driver IC gate oxide breakdown occurs. |
| Industrial Sensor Interface Protection | Automotive LIN Bus Line Protection |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in factory automation equipment. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA @ 18 V) TVS placed at connector interface to suppress EFT bursts. Use Value: Maintains signal integrity while meeting IEC 61000-4-4 Level 4 immunity requirements. | Use Scenario: Guarding LIN transceiver pins against coupling from nearby 12 V power lines in door modules. IC Role / Device Role / Timing Role: Standoff voltage (18 V) matches LIN bus operating range (up to ~18 V during transients). Use Value: Prevents false triggering or latch-up in LIN PHY without affecting normal 0–12 V signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A (ON Semiconductor) | Same DO-214AA package, identical VWM (18 V), but higher VC (30.0 V @ 33.3 A); slightly lower PPK (600 W) | Limited to lower-energy transients; not rated for full ISO 7637-2 Pulse 1 (1000 W) | Acceptable for cost-sensitive industrial designs where 600 W peak power suffices |
| P6SMB18A (Littelfuse) | Identical electrical specs (VWM = 18 V, VC = 29.2 V @ 34.2 A, PPK = 1000 W), same DO-214AA package, AEC-Q101 qualified | No functional difference; validated in same automotive test conditions | Drop-in alternative with identical performance and qualification-ideal for dual-sourcing |
Compared with SMBJ18A and P6SMB18A, the SMB10J18AH delivers full 1000 W ISO 7637-2 compliance and matches P6SMB18A's performance exactly, while offering tighter VBR tolerance (20.0–22.1 V) than SMBJ18A (20.0–22.8 V), improving clamping consistency in safety-critical systems.
Availability
SMB10J18AH is available at Aetrix Electronics and suitable for automotive power distribution, LED lighting systems, and industrial sensor interfaces requiring stable component supply and AEC-Q101-compliant transient protection.
Supply support for SMB10J18AH 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 was developed to deliver AEC-Q101-qualified, high-power TVS protection in compact SMB packages for next-generation automotive electronics and harsh-environment industrial controls.
FAQ
What is the maximum clamping voltage of SMB10J18AH and under what test condition?
The SMB10J18AH has a maximum clamping voltage (VC) of 29.2 V, measured at a peak pulse current (IPPM) of 34.2 A using the 10/1000 μs standard waveform. This value is guaranteed per the datasheet's Electrical Specifications table and defines the upper voltage limit imposed on protected circuits during a 1000 W transient event.
Is SMB10J18AH suitable for bidirectional transient protection?
No, SMB10J18AH is unidirectional. For bidirectional protection, use the SMB10J18CAH variant, which features symmetrical breakdown in both polarities. The "AH" suffix denotes unidirectional configuration with cathode band marking; substituting it in bidirectional circuits may result in improper clamping or device failure.
Does SMB10J18AH require special PCB layout considerations?
Yes. To preserve low-inductance clamping performance, minimize trace length between SMB10J18AH cathode and ground plane, use wide copper pours for anode and cathode connections, and avoid vias in surge current paths. The DO-214AA footprint must follow TSC's suggested pad layout to ensure thermal reliability and solder joint integrity.
What automotive standards does SMB10J18AH meet?
SMB10J18AH meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). It is also AEC-Q101 qualified, confirming robustness for automotive under-hood and cabin applications.
What is the junction-to-ambient thermal resistance (RθJA) of SMB10J18AH?
The SMB10J18AH has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W under standard JEDEC test conditions (single device on 1-inch² FR-4 board with 2 oz copper). This value assumes no additional copper heatsinking; actual RθJA improves significantly with thermal pads or internal ground planes.
SMB10J18AH 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 34.2A
- 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)
SMB10J18AH FAQ
1.How can I place an order for SMB10J18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J18AH 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 SMB10J18AH reliable?
The price and inventory of SMB10J18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J18AH is usually 5 days.
3.What payment methods are accepted for SMB10J18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J18AH?
SMB10J18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J18AH 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 SMB10J18AH?
For technical support, including SMB10J18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J18AH requirements.
6.How does Aetrix verify that SMB10J18AH is sourced from the original manufacturer or authorized distributors?
All SMB10J18AH 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 SMB10J18AH meets industry standards.
7.What is the process for return or replacement of SMB10J18AH?
All SMB10J18AH units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J18AH, 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 SMB10J18AH part is unused and in its original packaging.
Return procedure for SMB10J18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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