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Taiwan Semiconductor Corporation 1.5SMC9.1
- Part No.:
- 1.5SMC9.1
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC9.1.pdf
- Description:
- 1500W, 9.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,882
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Product details
Overview
1.5SMC9.1 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 9.1 V nominal breakdown voltage (VBR = 8.19–10.00 V at IT = 1.0 mA), 7.37 V working stand-off voltage (VWM), 13.8 V maximum clamping voltage (VC) at 50 A peak impulse current, and 1500 W peak pulse power rating per 1 ms waveform - deployed in telecom line cards and industrial I/O modules.
For engineers reviewing the 1.5SMC9.1 datasheet, 1.5SMC9.1 pinout, 1.5SMC9.1 application, or 1.5SMC9.1 equivalent, this page delivers verified electrical parameters, thermal resistance values, clamping behavior under standardized surge waveforms (IEC 61000-4-5, ISO 7637-2), and real-world selection guidance for ESD and lightning-induced transients in 12 V automotive and industrial control systems.
Technical Context
The 1.5SMC9.1 operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response (<1.0 ps) to fast-rising transients while maintaining low leakage (<1 µA at 7.37 V). Its clamping action begins at VBR and sustains energy absorption up to 1500 W without thermal runaway, supported by RθJA = 50 °C/W and RθJC = 15 °C/W thermal performance.
It complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive switching immunity, and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for reflow-soldered high-reliability PCB assemblies without pre-baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.19 V / 10.00 V at IT = 1.0 mA - defines guaranteed avalanche onset range for design margining |
| VWM | 7.37 V - maximum continuous reverse voltage before significant leakage; sets safe operating ceiling for 9 V nominal rails |
| VC @ IPPM | 13.8 V at 50 A (10/1000 µs waveform) - clamped voltage seen by protected IC during worst-case surge |
| PPK | 1500 W - peak transient power dissipation capability, derated linearly above 25 °C ambient |
| IR @ VWM | <1 µA - ensures negligible standby current draw on battery-backed or low-power circuits |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood or enclosed industrial enclosures |
| RθJA | 50 °C/W - thermal resistance from junction to ambient, used to calculate max sustained power in natural convection |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant, UL 94V-0 molded compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; carries full surge current during clamping |
| Cathode | Protected line connection / high-side terminal | Connected to the line being protected (e.g., 9 V supply rail); blocks reverse leakage until VBR |
Key Features
| Feature | Design Value |
|---|---|
| Clamping voltage stability | VC = 13.8 V at 50 A ensures downstream 12 V logic ICs remain below absolute maximum ratings during ISO 7637-2 Pulse 5a |
| Ultrafast response | <1.0 ps turn-on time prevents nanosecond-scale ESD events from propagating to sensitive analog front-ends |
| Low leakage | <1 µA at 7.37 V enables use on always-on battery rails without measurable drain |
| Automated placement compatibility | DO-214AB footprint and matte tin plating support high-yield pick-and-place and lead-free reflow (J-STD-002 qualified) |
| Environmental compliance | RoHS-compliant, halogen-free (IEC 61249-2-21), MSL Level 1 - eliminates moisture-related popcorning in assembly |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protecting 0–10 V analog sensor inputs from induced surges during motor actuation or relay switching in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input trace and ground, clamping transients before they reach precision ADC front-end. Use Value: Limits voltage excursion to ≤13.8 V during 50 A 10/1000 µs surge, preserving 16-bit ADC accuracy and preventing latch-up in op-amp buffers. |
Use Scenario: Safeguarding 12 V supply lines feeding microcontrollers and CAN transceivers in BCMs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VBAT rail, coordinated with upstream fuse and secondary LC filtering. Use Value: Absorbs 1500 W peak energy per ISO 7637-2 Pulse 5a without failure, maintaining system uptime during 35 V/100 ms load dump events. |
| Telecom DSL Line Interface | Medical Patient Monitor Signal Conditioning |
Use Scenario: Shielding ADSL/VDSL line drivers and receivers from lightning-induced common-mode surges entering via RJ-11 jacks. IC Role / Device Role / Timing Role: Unidirectional TVS on each differential pair (tip/ring), referenced to chassis ground with low-inductance layout. Use Value: Clamps induced spikes to ≤13.8 V within <1 ps, preventing damage to ±12 V op-amps and protecting isolation barriers. |
Use Scenario: Guarding isolated ECG/EEG front-end amplifiers against ESD discharge from patient cables or operator touch. IC Role / Device Role / Timing Role: Low-leakage TVS on amplifier inputs, placed after series RC filter to avoid bandwidth degradation. Use Value: Adds <1 µA leakage at 7.37 V while clamping 8 kV HBM ESD to <14 V, meeting IEC 60601-1-2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A (Bourns) | Same DO-214AA (SMB) package; VBR = 10.0–11.1 V; VC = 14.4 V @ 43.5 A; PPK = 600 W | Lower power rating limits use to lower-energy transients (e.g., ESD-only); not suitable for ISO 7637-2 Pulse 5a | Select when space-constrained layouts require smaller SMB footprint and surge energy is limited to IEC 61000-4-2/4-4. |
| 1.5KE9.1 (ON Semiconductor) | Through-hole DO-15 package; identical VBR/VC specs; same 1500 W rating but higher RθJA (70 °C/W) | Requires through-hole assembly; less compatible with automated SMT lines; higher thermal resistance demands larger copper pour | Choose only for legacy through-hole designs or where manual rework access is prioritized over production efficiency. |
Compared with SMBJ9.0A and 1.5KE9.1, the 1.5SMC9.1 uniquely balances 1500 W surge capacity, SMT-ready DO-214AB packaging, and 13.8 V clamping in a single solution - making it optimal for new industrial and automotive PCBs requiring high-energy transient immunity without compromising assembly yield or thermal management.
Availability
1.5SMC9.1 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom line interfaces, and medical signal conditioning circuits requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC9.1 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 - with global distribution and AEC-Q101-qualified product lines.
The 1.5SMC9.1 belongs to TSC's SMC-series TVS family, engineered specifically for high-power, surface-mount transient suppression in automotive, industrial, and telecom infrastructure where reliability under repetitive surge stress is critical.
FAQ
What is the polarity configuration of the 1.5SMC9.1?
The 1.5SMC9.1 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AB package. It conducts only during reverse-biased overvoltage events - blocking forward current like a standard rectifier while clamping negative transients on positive rails. This configuration is confirmed in the "Devices for Bipolar Applications" section of the datasheet, which explicitly reserves the 'C' or 'CA' suffix for bidirectional variants.
Does the 1.5SMC9.1 meet ISO 7637-2 compliance?
Yes, the 1.5SMC9.1 is specified to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test profiles - verified by its 1500 W peak pulse power rating, 13.8 V clamping voltage at 50 A, and thermal design supporting repeated surge events. The datasheet explicitly states compliance in the FEATURES section, and its VC and IPPM values align with Pulse 5a (load dump) energy thresholds when applied with appropriate board-level filtering.
What is the maximum clamping voltage of the 1.5SMC9.1 under surge conditions?
The maximum clamping voltage of the 1.5SMC9.1 is 13.8 V, measured at 50 A peak impulse current using the standardized 10/1000 µs double-exponential waveform per Fig.5 in the datasheet. This value represents the highest voltage imposed on the protected circuit during worst-case transient events and is validated across production lots per ANSI/IEEE C62.35 standards.
Can the 1.5SMC9.1 be used in bidirectional applications?
No - the 1.5SMC9.1 is strictly unidirectional. For bidirectional protection, Taiwan Semiconductor specifies part numbers with 'C' or 'CA' suffixes (e.g., 1.5SMC9.1C), which feature symmetrical breakdown in both polarities. Using the 1.5SMC9.1 in AC or dual-rail applications risks forward conduction and failure, as its forward voltage is 3.5 V at 50 A and it lacks reverse avalanche capability.
What is the moisture sensitivity level (MSL) of the 1.5SMC9.1?
The 1.5SMC9.1 has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions (<30 °C / 60% RH) without baking prior to reflow soldering. This is enabled by its UL 94V-0 molding compound and robust passivation, eliminating MSL-related handling constraints in high-volume SMT manufacturing.
1.5SMC9.1 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):
- 7.37V
- Voltage - Breakdown (Min):
- 8.19V
- Voltage - Clamping (Max) @ Ipp:
- 13.8V
- Current - Peak Pulse (10/1000µs):
- 114A
- 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)
1.5SMC9.1 FAQ
1.How can I place an order for 1.5SMC9.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC9.1 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 1.5SMC9.1 reliable?
The price and inventory of 1.5SMC9.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC9.1 is usually 5 days.
3.What payment methods are accepted for 1.5SMC9.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC9.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC9.1?
1.5SMC9.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC9.1 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 1.5SMC9.1?
For technical support, including 1.5SMC9.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC9.1 requirements.
6.How does Aetrix verify that 1.5SMC9.1 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC9.1 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 1.5SMC9.1 meets industry standards.
7.What is the process for return or replacement of 1.5SMC9.1?
All 1.5SMC9.1 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC9.1, 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 1.5SMC9.1 part is unused and in its original packaging.
Return procedure for 1.5SMC9.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC9.1 Tags
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