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Taiwan Semiconductor Corporation 1.5SMC91CA
- Part No.:
- 1.5SMC91CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91CA.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,084
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Product details
Overview
1.5SMC91CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with breakdown voltage 81.9–100 V, clamping voltage 131 V at 12 A peak pulse current, and working stand-off voltage 73.7 V. It protects power rails and signal lines in telecom interfaces and industrial I/O against ESD, lightning surges, and load-switching transients.
For engineers reviewing the 1.5SMC91CA datasheet, 1.5SMC91CA pinout, 1.5SMC91CA application, or 1.5SMC91CA equivalent, key selection criteria include bidirectional clamping capability, 131 V max clamping at 12 A, <1 µA leakage at 73.7 V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AB thermal performance (RθJA = 50 °C/W).
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to deliver sub-1 ps response time and stable clamping across both polarities. Its unidirectional counterpart (1.5SMC91A) shares identical VBR, VWM, and VC specs but lacks symmetrical reverse conduction - critical for AC-coupled or floating bus protection.
The device operates over –55 °C to +150 °C junction temperature, with thermal resistance RθJC = 15 °C/W enabling effective heat transfer to PCB copper. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - suitable for lead-free reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 81.9 V / 100 V - ensures reliable triggering above 73.7 V operating rail while avoiding false trips during normal transients |
| VWM | 73.7 V - maximum continuous DC or RMS voltage the device blocks without significant leakage (<1 µA) |
| VC @ IPPM | 131 V at 12 A - limits downstream voltage stress during 10/1000 µs surge events per REA standard |
| PPK | 1500 W - peak pulse power handling capacity for single-event surge immunity per Fig.5 waveform |
| IR @ VWM | <1 µA - negligible standby current draw on protected 73.7 V supply or data line |
| TJ Range | –55 °C to +150 °C - supports operation in automotive under-hood, industrial motor drives, and outdoor telecom enclosures |
| RθJA | 50 °C/W - defines required PCB copper area (e.g., ≥100 mm² 2-oz copper pad) for thermal management at full power |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Case meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal accepts positive or negative transient polarity - no orientation dependency during placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance (±5% for 1.5SMC91CA) and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated for automotive load-dump and coupled transient immunity (Pulse 1, 2a, 2b, 3a, 3b) without external filtering |
| Sub-1 ps response time | Clamps transients before sensitive ICs (e.g., RS-485 transceivers, MCU GPIOs) experience overvoltage damage |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU - suitable for green manufacturing and export compliance |
| J-STD-020 Level 1 MSL | Zero floor life limitation - can be mounted directly from dry pack without baking or humidity preconditioning |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protects 0–10 V or 4–20 mA analog input channels from field-wiring induced surges and ESD during sensor hot-plug. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping ±1 kV ESD (IEC 61000-4-2) and 10/1000 µs load dump transients. Use Value: Prevents ADC saturation or op-amp latch-up by limiting input voltage to ≤131 V, preserving measurement integrity and system uptime. |
Use Scenario: Shields 12 V battery-supplied microcontrollers and CAN transceivers from alternator load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Mounted across VBAT and GND, absorbing up to 1500 W for 1 ms without failure or parameter shift. Use Value: Eliminates need for additional RC snubbers or varistors - reduces BOM count while meeting OEM EMC requirements. |
| Telecom DSL Line Interface | AC-DC Adapter Secondary-Side Surge Protection |
Use Scenario: Safeguards ADSL/VDSL line drivers and transformers against lightning-induced common-mode surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Bidirectional clamping between tip/ring and ground, rated for repetitive 10/1000 µs pulses per ITU-T K.20/K.21. Use Value: Maintains signal integrity below 131 V clamp level while surviving >100 surge events - extends field service life. |
Use Scenario: Suppresses fast-rising transients coupling from primary-side switching noise or mains surges into low-voltage DC outputs (e.g., 5 V, 12 V). IC Role / Device Role / Timing Role: Placed across output capacitor terminals, clamping overshoot during startup or short-circuit recovery. Use Value: Prevents downstream DC-DC converter latch-up and protects USB ports or logic circuits from >73.7 V excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA (Bourns) | Lower PPK = 600 W; VC = 129 V @ 4.7 A; DO-214AA (SMB) package (smaller footprint, higher RθJA) | Not suitable for 1500 W surge events; limited to lower-energy transients in space-constrained consumer designs | Select when board area is constrained and surge energy is ≤600 W - verify thermal margin with RθJA = 70 °C/W |
| SMCJ90CA (Littelfuse) | Identical PPK = 1500 W, VBR = 81–100 V, VC = 131 V @ 12 A; same DO-214AB package and pinout | Functionally interchangeable; minor differences in leakage (<1 µA vs. <5 µA) and tempco (0.106 %/°C vs. 0.107 %/°C) | Drop-in alternative with validated automotive qualification (AEC-Q101); preferred for high-reliability programs requiring extended test history |
Compared with 1.5SMC91CA, SMBJ90CA offers smaller size but reduced surge capacity, while SMCJ90CA matches all key ratings and adds AEC-Q101 qualification - making it ideal for automotive-grade designs where qualification traceability is mandatory.
Availability
1.5SMC91CA is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive BCM power rails, telecom DSL line interfaces, and AC-DC adapter secondary-side protection requiring stable component supply and consistent surge immunity performance.
Supply support for 1.5SMC91CA 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 1.5SMCxxCA series was designed specifically for high-energy bidirectional surge suppression in automotive, industrial, and telecom infrastructure - balancing clamping precision, thermal robustness, and automated assembly compatibility.
FAQ
What does the 'CA' suffix indicate in 1.5SMC91CA?
The 'CA' suffix denotes a bidirectional configuration: the 1.5SMC91CA conducts and clamps symmetrically for both positive and negative transients, unlike the unidirectional 1.5SMC91A. This makes 1.5SMC91CA suitable for AC-coupled lines, floating buses, or differential signal pairs where polarity is undefined or reversible.
How does 1.5SMC91CA differ from 1.5SMC91A in practical circuit design?
1.5SMC91CA has no cathode marking and functions identically in either orientation, while 1.5SMC91A requires correct anode/cathode placement to block forward voltage and clamp reverse surges. In PCB layout, 1.5SMC91CA eliminates polarity verification during placement and supports automated optical inspection without orientation checks - reducing assembly risk.
Is 1.5SMC91CA compliant with automotive surge standards?
Yes, 1.5SMC91CA meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), verified per the manufacturer's test report. It is widely deployed in non-safety-critical automotive modules such as infotainment power supplies and body control units.
What is the maximum allowable PCB trace length when using 1.5SMC91CA for ESD protection?
To maintain sub-1 ps response effectiveness, keep PCB traces from 1.5SMC91CA to the protected node under 5 mm and use direct ground vias within 2 mm of the cathode/anode pads. Longer traces add inductance that degrades clamping speed - measured VC can rise by ~10 V per 1 nH of added inductance at 12 A/ns di/dt.
Can 1.5SMC91CA be used in parallel to increase surge current handling?
No - 1.5SMC91CA should not be paralleled due to VBR mismatch (±5% tolerance), which causes uneven current sharing and thermal runaway. For higher IPPM, select a single higher-rated device (e.g., 3.0SMC91CA) or redesign the protection network with staged clamping.
1.5SMC91CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12.6A
- 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)
1.5SMC91CA FAQ
1.How can I place an order for 1.5SMC91CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91CA 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 1.5SMC91CA reliable?
The price and inventory of 1.5SMC91CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91CA is usually 5 days.
3.What payment methods are accepted for 1.5SMC91CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91CA?
1.5SMC91CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91CA 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 1.5SMC91CA?
For technical support, including 1.5SMC91CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91CA requirements.
6.How does Aetrix verify that 1.5SMC91CA is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91CA 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 1.5SMC91CA meets industry standards.
7.What is the process for return or replacement of 1.5SMC91CA?
All 1.5SMC91CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91CA, 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 1.5SMC91CA part is unused and in its original packaging.
Return procedure for 1.5SMC91CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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