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Taiwan Semiconductor Corporation 1.5SMC91A
- Part No.:
- 1.5SMC91A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91A.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,882
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Product details
Overview
1.5SMC91A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 91V breakdown voltage (86.5–95.5V), 1500W peak pulse power rating, 12.6A maximum peak impulse current, and clamps transients to ≤125V at rated surge. It is used in industrial power supplies to protect rectifier outputs and DC-DC converter inputs against lightning-induced surges and load-switching transients.
For engineers reviewing the 1.5SMC91A datasheet, 1.5SMC91A pinout, 1.5SMC91A application, or 1.5SMC91A equivalent, key selection criteria include working stand-off voltage (77.8V), clamping voltage under 12.6A surge (≤125V), unidirectional polarity, DO-214AB package thermal performance (RθJC = 15°C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Technical Context
The 1.5SMC91A operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) and stable clamping under repetitive or single-event transients. Its unidirectional configuration provides low-leakage blocking (≤1 µA at 77.8V) and forward conduction capability up to 200A surge (IFSM), supporting protection of both input and output stages in regulated power systems.
Thermally, it is rated for junction temperatures from –55°C to +150°C, with RθJA = 50°C/W and RθJC = 15°C/W - confirming suitability for high-power-density PCB layouts where heatsinking via the cathode pad is critical. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 86.5–95.5 V - defines minimum and maximum avalanche onset voltage under standardized test; ensures consistent clamping threshold across production lot |
| VWM | 77.8 V - maximum continuous reverse operating voltage; sets safe DC bias margin before leakage rises significantly |
| VC @ IPPM = 12.6 A | ≤125 V - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure level |
| PPK | 1500 W - peak pulse power handling per 1 ms pulse; enables survival of automotive load-dump and industrial switching events |
| IR @ VWM | ≤1 µA - ultra-low reverse leakage at rated stand-off; preserves efficiency in high-impedance sensing or battery-backed circuits |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 2.54 mm lead pitch; supports automated placement and reflow soldering per J-STD-002 |
| Configuration | Unidirectional - provides asymmetric protection: blocks reverse voltage up to VWM, conducts forward surges only when anode-to-cathode polarity is applied |
Pinout & Package
Package: DO-214AB (SMC), molded plastic case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Transient current entry point during forward surge | Connects to protected line side (e.g., DC input rail); must be routed with low-inductance trace to minimize clamping overshoot |
| Cathode (banded end) | Transient current return path and heat sink interface | Must be connected to low-impedance ground plane or thermal pad; primary thermal conduction path to PCB (RθJC = 15°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift under thermal cycling and humidity stress |
| Fast response time <1.0 ps | Clamps ESD and fast-rising transients before downstream ICs experience damaging voltage excursions |
| ISO 7637-2 compliant | Validated for automotive-level immunity testing (Pulse 1, 2a, 2b, 3a, 3b), enabling use in vehicle ECUs and body electronics |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for green manufacturing and export-compliant designs |
| J-STD-020 MSL Level 1 | Zero floor life limitation - can be stored indefinitely at ≤30°C/60% RH without baking prior to reflow |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: Protects AC/DC adapter front-end rectifiers and bulk capacitors from lightning-induced surges on 24V/48V distribution lines. IC Role / Device Role / Timing Role: Standby clamping element placed between input rail and chassis ground; activated only during >77.8V transients. Use Value: Limits transient voltage to ≤125V, preventing damage to upstream bridge rectifiers and downstream PWM controllers while maintaining <1 µA leakage during normal operation. |
Use Scenario: Shields CANH/CANL differential pair in BCM from load-dump pulses and ESD events during vehicle assembly or service. IC Role / Device Role / Timing Role: Unidirectional TVS placed on each line referenced to ground; leverages fast <1.0 ps response to suppress sub-nanosecond ESD spikes. Use Value: Clamps 12.6A surge to ≤125V without degrading CAN signal integrity; certified to ISO 7637-2 Pulse 2b (inductive switch-off) and Pulse 3b (capacitive discharge). |
| Telecom DSL Line Card Surge Protection | Medical Diagnostic Equipment Power Rail Protection |
Use Scenario: Guards ADSL/VDSL line interface transformers and PHY ICs against induced surges from nearby power lines or lightning coupling. IC Role / Device Role / Timing Role: Primary protection device on secondary-side DC bias rails feeding line drivers; placed after isolation transformer. Use Value: Withstands 1500W peak pulse energy while adding <1 µA leakage - preserving low-noise bias conditions required for high-SNR analog front-ends. |
Use Scenario: Safeguards isolated 5V/3.3V logic rails in ultrasound imaging units and patient monitoring systems from ESD during connector mating/unmating. IC Role / Device Role / Timing Role: Secondary-stage TVS on low-voltage digital supply lines; complements primary MOV-based AC input protection. Use Value: Provides precise 77.8V stand-off with no false triggering during normal operation, and clamps ESD to ≤125V - meeting IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact) requirements. |
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) | Same DO-214AA package; lower PPK = 600W; VBR = 100–111V; VC = 146V @ 4.1A | Lower surge capacity limits use to lighter-duty telecom or consumer applications; not ISO 7637-2 certified | Select when space-constrained layout requires smaller SMB footprint and surge energy is <600W |
| 1.5KE91A (ON Semiconductor) | Through-hole DO-15 package; identical VBR/VC specs; PPK = 1500W; higher RθJA = 130°C/W | Requires manual or wave soldering; unsuitable for fully SMT production; thermal performance inferior without external heatsink | Select only for legacy through-hole designs or prototyping where rework flexibility outweighs automated assembly needs |
Compared with SMBJ90A and 1.5KE91A, the 1.5SMC91A delivers superior surge robustness in a surface-mount package with best-in-class thermal resistance (RθJC = 15°C/W), making it optimal for high-reliability industrial and automotive applications requiring automated assembly and repeatable thermal management.
Availability
1.5SMC91A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom line cards, and medical diagnostic equipment requiring stable component supply and full compliance with ISO 7637-2 and RoHS standards.
Supply support for 1.5SMC91A 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, and rectifiers, with global distribution and AEC-Q200 qualified product lines.
The 1.5SMC91A belongs to TSC's SMC-series transient voltage suppressors - engineered for high-energy surge immunity in harsh environments, emphasizing reliability, tight parametric tolerances, and automotive-grade qualification.
FAQ
What is the breakdown voltage range for the 1.5SMC91A?
The 1.5SMC91A has a guaranteed breakdown voltage range of 86.5 V to 95.5 V at 1.0 mA test current (VBR @ IT = 1.0 mA), measured per ANSI/IEEE C62.35. This range ensures predictable clamping behavior across temperature and process variation, and is confirmed in TSC's S2207 datasheet revision for the 1.5SMC91A part number specifically.
Is the 1.5SMC91A unidirectional or bidirectional?
The 1.5SMC91A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It blocks reverse voltage up to 77.8 V (VWM) and conducts only when forward-biased beyond its breakdown threshold. Polarity is marked by a cathode band on the DO-214AB package, and correct orientation is essential for proper protection function in the 1.5SMC91A.
What is the maximum clamping voltage of the 1.5SMC91A under surge conditions?
The 1.5SMC91A clamps to a maximum of 125 V when subjected to its rated peak impulse current of 12.6 A (IPPM), using the standard 10/1000 µs double-exponential waveform defined in Fig.5 of the TSC datasheet. This clamping voltage is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during transient events.
Does the 1.5SMC91A meet automotive surge immunity standards?
Yes, the 1.5SMC91A 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 and ESD). This compliance is explicitly stated in the "FEATURES" section of the TSC S2207 datasheet and validated per the test conditions defined in the standard.
What is the thermal resistance from junction to case for the 1.5SMC91A?
The junction-to-case thermal resistance (RθJC) of the 1.5SMC91A is 15°C/W, as specified in the "THERMAL PERFORMANCE" table of the TSC S2207 datasheet. This value reflects conduction through the cathode terminal into the PCB copper, and is critical for calculating safe power derating when ambient temperature exceeds 25°C.
1.5SMC91A 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):
- 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)
1.5SMC91A FAQ
1.How can I place an order for 1.5SMC91A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91A 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 1.5SMC91A reliable?
The price and inventory of 1.5SMC91A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91A is usually 5 days.
3.What payment methods are accepted for 1.5SMC91A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91A?
1.5SMC91A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91A 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 1.5SMC91A?
For technical support, including 1.5SMC91A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91A requirements.
6.How does Aetrix verify that 1.5SMC91A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91A 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 1.5SMC91A meets industry standards.
7.What is the process for return or replacement of 1.5SMC91A?
All 1.5SMC91A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91A, 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 1.5SMC91A part is unused and in its original packaging.
Return procedure for 1.5SMC91A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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