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Taiwan Semiconductor Corporation 1.5SMC9.1A
- Part No.:
- 1.5SMC9.1A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC9.1A.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,726
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Product details
Overview
1.5SMC9.1A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 9.1 V nominal breakdown voltage (VBR = 8.65–9.55 V), 7.78 V working stand-off voltage (VWM), 1500 W peak pulse power rating (10/1000 µs), clamps to ≤13.4 V at 12.6 A peak impulse current, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump immunity.
For engineers reviewing the 1.5SMC9.1A datasheet, 1.5SMC9.1A pinout, 1.5SMC9.1A application, or 1.5SMC9.1A equivalent, this device is selected for robust ESD and surge protection in telecom interfaces, industrial I/O modules, and automotive body electronics where low clamping voltage and sub-nanosecond response (<1.0 ps) are critical to safeguarding downstream ICs.
Technical Context
The 1.5SMC9.1A operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast turn-on during transients while maintaining <1 µA leakage at 7.78 V. Its DO-214AB (SMC) package supports automated placement and delivers 150 °C maximum junction temperature with 50 °C/W junction-to-ambient thermal resistance.
It complies with JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards, and its electrical behavior follows ANSI/IEEE C62.35 definitions - including 10/1000 µs waveform compliance, 1.0 mA test current for VBR, and 12.6 A peak impulse current (IPPM) at which clamping voltage is guaranteed ≤13.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.65 V / 9.55 V - Ensures reliable avalanche conduction onset within tight tolerance for predictable clamping start point |
| VWM | 7.78 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage (<1 µA) |
| VC@IPPM | ≤13.4 V at 12.6 A - Limits voltage seen by protected circuit during worst-case 10/1000 µs surge |
| PPK | 1500 W - Sustains high-energy transients such as ISO 7637-2 Pulse 1 (inductive switch-off) without failure |
| IPPM | 12.6 A - Peak surge current capability under standardized 10/1000 µs waveform per Fig.5 |
| TJMAX | +150 °C - Enables operation in under-hood automotive or high-ambient industrial environments |
| RθJA | 50 °C/W - Defines thermal derating limit: full 1500 W only at TA = 25 °C; power must be reduced above that |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side of protected circuit | Connected to source of transient energy (e.g., power rail or signal line); conducts during reverse-biased surge |
| Cathode | Ground/reference side | Connected to system ground or return path; polarity-marked band identifies this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 13.4 V max at 12.6 A ensures safe voltage margin below 15 V logic or 12 V supply rails |
| Response time | <1.0 ps enables protection against ESD events (IEC 61000-4-2) before sensitive ICs latch or fail |
| Leakage control | <1 µA @ 7.78 V minimizes standby power loss in battery-powered or always-on systems |
| Automated assembly support | DO-214AB footprint and matte tin plating ensure reliable reflow soldering and pick-and-place compatibility |
| Automotive qualification | Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b - validated for 12 V vehicle electrical system transients |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from inductive kickback and field-wiring surges. IC Role / Device Role / Timing Role: Primary unidirectional TVS placed between field input and optocoupler/signal conditioner input. Use Value: Clamps 1 kV/1 Ω surge to ≤13.4 V, preserving signal integrity and preventing damage to isolation barriers rated for ≤15 V absolute max. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs in door module ECUs exposed to battery disconnect/load dump events. IC Role / Device Role / Timing Role: Line-side TVS on 12 V supply rail and LIN data line, operating in parallel with ceramic ESD suppressors. Use Value: Absorbs 1500 W ISO 7637-2 Pulse 2b (load dump) energy without degradation, maintaining system uptime during vehicle cranking. |
| Telecom Ethernet Port Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Secondary-level surge suppression on PoE-powered Ethernet ports (10/100BASE-T) after primary GDT or MOV stages. IC Role / Device Role / Timing Role: Fast-response TVS bridging data pair to chassis ground, triggered after slower primary protectors. Use Value: Sub-nanosecond response captures residual fast transients missed by GDTs, limiting differential-mode voltage to <15 V across PHY interface. |
Use Scenario: Input-stage overvoltage clamp on AC-DC adapter secondary side (5–12 V output rails) against capacitor discharge or regulator fault. IC Role / Device Role / Timing Role: Unidirectional shunt protector between output rail and ground, sized for 1500 W short-duration faults. Use Value: Prevents downstream USB-C PD controllers or LDOs from experiencing >13.4 V stress during output short-circuit recovery events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600 W; VBR = 10.0–11.1 V; VC = 14.4 V @ 22.2 A | Lower power handling limits use to sub-1 kV surges; not suitable for ISO 7637-2 Pulse 1 without derating | Select when space-constrained layouts require smaller SMB footprint and surge energy is limited to ≤600 W |
| 1.5KE9.1A (Taiwan Semiconductor) | Through-hole DO-15 package; identical VBR/VC specs; same 1500 W rating but higher RθJA = 100 °C/W | Requires PCB through-hole real estate and manual or wave-solder process; less suitable for high-density SMT designs | Choose for legacy through-hole production or where thermal mass of leaded package improves long-pulse survivability |
Compared with SMBJ9.0A and 1.5KE9.1A, the 1.5SMC9.1A uniquely balances 1500 W surge capacity, SMT scalability, and low 13.4 V clamping in a compact DO-214AB package - making it optimal for new automotive and industrial designs requiring both high energy absorption and automated manufacturing.
Availability
1.5SMC9.1A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom Ethernet port hardening, and consumer power adapter input-stage clamping requiring stable component supply and full traceability.
Supply support for 1.5SMC9.1A 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 1.5SMC9.1A belongs to TSC's SMC-series transient voltage suppressor family, engineered specifically for high-reliability surface-mount surge protection in automotive, industrial, and telecom infrastructure where consistent clamping, low leakage, and AEC-Q200-aligned robustness are required.
FAQ
What is the polarity configuration of the 1.5SMC9.1A?
The 1.5SMC9.1A is a unidirectional TVS diode, meaning it conducts only when reverse-biased beyond its breakdown voltage. Its cathode is marked by a band on the DO-214AB package, and it must be oriented with cathode toward the protected circuit's ground reference. This configuration provides superior leakage performance (<1 µA at 7.78 V) compared to bidirectional variants, making it ideal for DC rail protection where polarity is fixed.
Does the 1.5SMC9.1A meet automotive transient immunity standards?
Yes, the 1.5SMC9.1A meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (capacitive coupling) requirements. Its 1500 W peak pulse power rating and 13.4 V clamping voltage at 12.6 A enable reliable suppression of 12 V system transients without degradation, supporting design-in for body electronics, lighting modules, and infotainment power supplies.
How does the 1.5SMC9.1A compare to the 1.5SMC9.1 (non-A) variant?
The 1.5SMC9.1A offers tighter breakdown voltage tolerance (8.65–9.55 V) versus the standard 1.5SMC9.1 (8.19–10.00 V), resulting in more consistent clamping onset and improved system margin control. Both share identical package, power rating, and thermal specs, but the "A" suffix denotes enhanced VBR uniformity - critical for designs requiring precise overvoltage thresholding in safety-critical or tightly regulated rails.
What is the maximum steady-state power dissipation for the 1.5SMC9.1A?
The 1.5SMC9.1A has a steady-state power dissipation (PD) of 6.5 W at TA = 25 °C. This value applies only to continuous DC or low-frequency conditions - not transient events. In practice, the device is not intended for sustained power dissipation; its 1500 W rating applies exclusively to short-duration (1 ms) pulses. Thermal design must follow the 50 °C/W junction-to-ambient resistance to avoid exceeding 150 °C junction temperature.
Can the 1.5SMC9.1A be used in bidirectional signal line protection?
No - the 1.5SMC9.1A is unidirectional and unsuitable for AC or bidirectional signal lines without external circuitry. For bidirectional protection (e.g., RS-485, CAN, USB), a dedicated bidirectional part such as 1.5SMC9.1CA must be used. Attempting to use the 1.5SMC9.1A on AC signals risks forward conduction during negative half-cycles, leading to excessive leakage, overheating, or failure.
1.5SMC9.1A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 117A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC9.1A FAQ
1.How can I place an order for 1.5SMC9.1A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC9.1A 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 1.5SMC9.1A reliable?
The price and inventory of 1.5SMC9.1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC9.1A is usually 5 days.
3.What payment methods are accepted for 1.5SMC9.1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC9.1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC9.1A?
1.5SMC9.1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC9.1A 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 1.5SMC9.1A?
For technical support, including 1.5SMC9.1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC9.1A requirements.
6.How does Aetrix verify that 1.5SMC9.1A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC9.1A 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 1.5SMC9.1A meets industry standards.
7.What is the process for return or replacement of 1.5SMC9.1A?
All 1.5SMC9.1A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC9.1A, 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 1.5SMC9.1A part is unused and in its original packaging.
Return procedure for 1.5SMC9.1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC9.1A Tags
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