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Taiwan Semiconductor Corporation 1.5SMC91
- Part No.:
- 1.5SMC91
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91.pdf
- Description:
- 1500W, 91V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,059
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Product details
Overview
1.5SMC91 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 91 V breakdown voltage (VBR = 81.9–100 V), 1500 W peak pulse power rating (tp = 1 ms), 131 V maximum clamping voltage at 12 A peak impulse current, and DO-214AB (SMC) package with glass-passivated junction. It is used in telecom power inputs to suppress lightning-induced surges.
For engineers reviewing the 1.5SMC91 datasheet, 1.5SMC91 pinout, 1.5SMC91 application, or 1.5SMC91 equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, leakage current at operating voltage (≤1 µA @ 73.7 V), thermal resistance (RθJC = 15 °C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ) with ≤1 µA leakage at 73.7 V working stand-off voltage; during transients exceeding 81.9 V, it avalanches rapidly (<1 ps response) to clamp energy into ground. Its single-die DO-214AB construction supports 200 A non-repetitive forward surge capability and meets JESD201 Class 2 whisker resistance.
Thermal performance is defined by RθJA = 50 °C/W (board-mounted, JEDEC standard) and RθJC = 15 °C/W, enabling sustained 6.5 W steady-state dissipation at TA = 25 °C. The device's 0.106 %/°C VBR temperature coefficient ensures predictable voltage drift across –55 to +150 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 81.9–100 V - defines minimum and maximum avalanche initiation threshold under standardized test current |
| VWM | 73.7 V - maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VC @ IPPM = 12 A | 131 V - clamping voltage seen by protected circuit during 10/1000 µs surge; determines safe margin vs. downstream IC absolute max rating |
| PPK | 1500 W - peak transient power absorption capability for 1 ms pulse; defines surge energy handling limit |
| IR @ VWM | ≤1 µA - leakage current at rated stand-off voltage; critical for low-power or battery-backed circuits |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.11 × 6.22 mm footprint and cathode band marking |
| Junction Temp Range | –55 to +150 °C - operational range compatible with automotive under-hood and industrial ambient conditions |
Pinout & Package
1.5SMC91 uses the DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads solderable per J-STD-002, polarity indicated by cathode band on one end. Weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., +12 V rail); conducts during reverse-biased avalanche |
| Cathode | Ground/Clamp return terminal | Connected to system ground or low-impedance return path; carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| Fast response time < 1.0 ps | Ensures clamping activation before transient energy damages downstream CMOS or analog components |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive ECU power-line immunity testing without external filtering augmentation |
| Moisture sensitivity level 1 (J-STD-020) | Allows unlimited floor life and standard reflow without baking preconditioning |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for consumer, industrial, and telecom end equipment |
Applications
| Telecom Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protects 48 V DC power input of VoIP gateways against induced surges from nearby AC mains switching or lightning coupling. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed between input rail and chassis ground, activated only during overvoltage events. Use Value: Clamps 1 kV/10/1000 µs surge to ≤131 V, preserving integrity of upstream DC-DC converter and downstream Ethernet PHY ICs rated to 135 V abs max. |
Use Scenario: Safeguards 24 V digital input channels of programmable logic controllers exposed to relay coil flyback and field wiring transients. IC Role / Device Role / Timing Role: Primary-level protection element mounted directly at connector entry point, preceding series current-limiting resistor and optocoupler. Use Value: Limits transient voltage to 131 V within 1 ps, preventing latch-up or gate oxide rupture in input buffer ICs while maintaining <1 µA leakage during normal 24 V operation. |
| Automotive Body Control Module (BCM) Power Rail | Consumer Appliance Motor Drive Supply |
Use Scenario: Secures 12 V supply line of BCM microcontroller against load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-rail, cathode-to-ground; selected for 73.7 V VWM to tolerate battery ripple while blocking. Use Value: Absorbs 1500 W peak pulse without degradation, ensuring MCU reset circuitry remains functional after repeated 12 V line disturbances. |
Use Scenario: Shields 310 V DC bus of variable-speed washing machine motor drives from IGBT switching spikes and ESD events during service access. IC Role / Device Role / Timing Role: High-energy clamping device placed across bulk capacitor terminals, diverting fast-rising edge transients away from gate drivers. Use Value: Withstands 200 A non-repetitive forward surge and maintains ≤1 µA leakage at 73.7 V, supporting energy-efficient standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A (Bourns) | Bi-directional configuration; 90 V VBR min; 1000 W PPK; SMB package (smaller footprint, lower thermal mass) | Required where AC-coupled or bidirectional signal lines need protection (e.g., RS-485); not suitable for DC rail-only use without polarity consideration | Select SMBJ90A only if bidirectional protection is needed and board layout allows smaller SMB footprint with adequate copper pour for thermal management. |
| 1.5KE91A (ON Semiconductor) | Through-hole DO-201 package; identical 91 V VBR range and 131 V VC; same 1500 W rating but higher RθJA (~65 °C/W) | Used in legacy designs or high-reliability through-hole assemblies; incompatible with automated SMT lines without adapter | Choose 1.5KE91A only for through-hole prototyping, repair, or mixed-technology boards where SMT placement is unavailable. |
Compared with SMBJ90A and 1.5KE91A, the 1.5SMC91 offers superior thermal performance (RθJC = 15 °C/W), SMT compatibility for high-volume manufacturing, and unidirectional optimization for DC power rail protection-making it preferred for new automotive and industrial PCB designs requiring robust, automated assembly.
Availability
1.5SMC91 is available at Aetrix Electronics and suitable for telecom power inputs, industrial PLC I/O modules, automotive body control units, and consumer appliance motor drive supplies requiring stable component supply and full traceability.
Supply support for 1.5SMC91 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 ISO 9001 and IATF 16949 certified facilities.
The 1.5SMCxx series was engineered for high-energy, surface-mount transient suppression in automotive, industrial, and telecom infrastructure-emphasizing ruggedness, consistency, and compliance with ISO 7637-2 and AEC-Q101 stress requirements.
FAQ
What is the maximum clamping voltage of the 1.5SMC91 under standard test conditions?
The 1.5SMC91 exhibits a maximum clamping voltage (VC) of 131 V when subjected to a 10/1000 µs waveform peak impulse current of 12 A. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on the protected circuit during surge events-critical for verifying margin against downstream IC absolute maximum ratings. The 1.5SMC91 maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC91 suitable for bidirectional signal line protection?
No, the 1.5SMC91 is a unidirectional TVS diode intended for DC power rail protection only. Its electrical specifications-including forward voltage (VF = 3.5 V @ 50 A) and polarity marking-are defined for anode-to-line, cathode-to-ground configuration. For bidirectional applications such as RS-485 or USB data lines, a part with "C" or "CA" suffix (e.g., 1.5SMC91CA) or a dedicated bi-directional TVS like SMBJ90A must be used instead of the 1.5SMC91.
What is the working stand-off voltage (VWM) of the 1.5SMC91, and why does it matter?
The 1.5SMC91 has a working stand-off voltage (VWM) of 73.7 V-the highest DC or RMS voltage it can block continuously without exceeding 1 µA leakage current. This parameter ensures reliable operation under nominal system voltage (e.g., 48 V or 60 V telecom rails with ripple) while remaining inactive until transients exceed the 81.9–100 V breakdown range. Selecting a VWM ≥10–20% above nominal rail voltage prevents false triggering and minimizes power loss in the 1.5SMC91 during normal operation.
Does the 1.5SMC91 meet automotive transient immunity standards?
Yes, the 1.5SMC91 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronic components, validated per manufacturer characterization. Its 1500 W peak power rating, fast <1 ps response, and stable clamping behavior enable direct integration into body control module (BCM), infotainment, and sensor interface power rails-without additional filtering-to pass load dump and coupled transient tests required for AEC-Q101-compliant designs using the 1.5SMC91.
What is the thermal resistance profile of the 1.5SMC91, and how does it affect PCB layout?
The 1.5SMC91 has a junction-to-case thermal resistance (RθJC) of 15 °C/W and junction-to-ambient (RθJA) of 50 °C/W under JEDEC standard mounting. To sustain its 6.5 W steady-state power rating, PCB layout must provide ≥100 mm² of 1-oz copper connected to both terminals, with thermal vias under the cathode pad. Inadequate copper area raises junction temperature beyond 150 °C, degrading clamping consistency and shortening lifetime-especially critical in enclosed automotive or industrial enclosures where the 1.5SMC91 operates near thermal limits.
1.5SMC91 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):
- 73.7V
- Voltage - Breakdown (Min):
- 81.9V
- Voltage - Clamping (Max) @ Ipp:
- 131V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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)
1.5SMC91 FAQ
1.How can I place an order for 1.5SMC91 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91 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 1.5SMC91 reliable?
The price and inventory of 1.5SMC91 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91 is usually 5 days.
3.What payment methods are accepted for 1.5SMC91?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91?
1.5SMC91 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91 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 1.5SMC91?
For technical support, including 1.5SMC91 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91 requirements.
6.How does Aetrix verify that 1.5SMC91 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91 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 1.5SMC91 meets industry standards.
7.What is the process for return or replacement of 1.5SMC91?
All 1.5SMC91 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91, 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 1.5SMC91 part is unused and in its original packaging.
Return procedure for 1.5SMC91:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91 Tags
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