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Vishay General Semiconductor - Diodes Division 1.5SMC9.1AHM3/I
- Part No.:
- 1.5SMC9.1AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC9.1AHM3/I.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,614
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Product details
Overview
1.5SMC9.1AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 9.1 V breakdown voltage (VBR = 8.65–9.55 V at IT = 1.0 mA), 7.78 V stand-off voltage (VWM), and clamps transients to ≤13.4 V at 50 A peak pulse current (IPPM) under 10/1000 μs waveform - used to protect automotive sensor signal lines against ESD and load-dump-induced surges.
For engineers reviewing the 1.5SMC9.1AHM3/I datasheet, 1.5SMC9.1AHM3/I pinout, 1.5SMC9.1AHM3/I application, or 1.5SMC9.1AHM3/I equivalent, this part delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, 1500 W peak pulse power rating, low clamping ratio (1.73×VWM), and MSL Level 1 moisture sensitivity - critical for automotive-grade PCB designs requiring long-term reliability in harsh environments.
Technical Context
The 1.5SMC9.1AHM3/I employs a glass-passivated silicon junction optimized for fast transient response (<1 ps typical) and low incremental surge resistance. Its unidirectional polarity enables asymmetric clamping with cathode-band marking, supporting DC-biased protection paths in power rails and I/O interfaces.
Rated for 150 °C maximum junction temperature and derated linearly above 25 °C ambient, it sustains 6.5 W steady-state power dissipation on infinite heatsink and handles 200 A non-repetitive forward surge (8.3 ms half-sine). Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-leads), enabling robust thermal management on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.65 V / 9.55 V at 1.0 mA test current - defines precise voltage threshold where clamping initiates, ensuring reliable overvoltage detection before downstream IC damage. |
| VWM | 7.78 V - maximum continuous reverse operating voltage; sets safe DC bias margin below breakdown for stable standby operation. |
| VC @ IPPM | ≤13.4 V at 50 A (10/1000 μs) - actual clamped voltage seen by protected circuit; low value minimizes stress on 5 V or 3.3 V logic interfaces. |
| PPPM | 1500 W - peak transient energy absorption capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IFSM | 200 A (8.3 ms half-sine) - surge current handling without failure; critical for automotive load-dump protection per ISO 7637-2. |
| TJ max | 150 °C - maximum junction temperature; enables operation in under-hood automotive environments without thermal shutdown. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 3.2 mm minimum body height and 7.75 mm length; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection point | Connected to the node requiring surge suppression (e.g., CAN_H, LIN bus, or sensor output); reverse-biased during normal operation. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment systems - meets stress-test requirements for temperature cycling, HTRB, and ESD. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Complies with EU Directive 2011/65/EU and JEDEC J-STD-20; eliminates brominated flame retardants for safer end-of-life processing. |
| 1500 W peak pulse power (10/1000 μs) | Withstands repeated high-energy transients without degradation - suitable for industrial motor drives and automotive alternator load-dump scenarios. |
| Low clamping ratio (VC/VWM ≈ 1.72) | Minimizes overvoltage overshoot during clamping - preserves margin for 5 V tolerant microcontrollers and analog front-ends. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement for SMT assembly - reduces manufacturing cost and avoids moisture-related popcorning defects. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine bay modules exposed to ISO 7637-2 pulses and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and MCU ADC input to clamp transients before signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs by limiting voltage to ≤13.4 V during 50 A surges - maintaining measurement integrity across -40 °C to +125 °C. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers connected to 24 V DC field devices subject to inductive kickback. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point, shunting surge energy to chassis ground before reaching optocoupler inputs. Use Value: Enables >100,000 surge cycles without parameter shift due to glass-passivated junction - extending mean time between failures in factory automation systems. |
| Telecom Power Rail Protection | Consumer USB Port ESD Suppression |
|
Use Scenario: Securing 12 V auxiliary power rails in VoIP gateways and base station backplanes against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC-DC converter output, coordinated with upstream fuse and downstream ceramic capacitors. Use Value: Delivers 1500 W peak power handling with <1 ns response - faster than MOVs and more robust than polymer-based suppressors for telecom infrastructure. |
Use Scenario: Adding secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Secondary TVS stage after integrated ESD diodes in USB transceivers, absorbing residual 8 kV contact discharge energy. Use Value: Low leakage (<50 μA at 7.78 V) prevents battery drain in always-on devices; SMC footprint allows placement near USB connector without layout congestion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A | Lower peak pulse power (400 W), SMA package (smaller thermal mass), VBR = 8.5–9.4 V, VC = 14.4 V @ 27.8 A | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use | Select when cost-sensitive, space-constrained designs require smaller footprint and lower surge levels suffice. |
| 1.5KE9.1A | Through-hole DO-201 package, same electrical specs but higher RθJA (100 °C/W), no AEC-Q101 or halogen-free certification | Requires wave soldering; unsuitable for automated SMT lines or automotive production | Choose only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency. |
Compared with SMAJ9.0A and 1.5KE9.1A, the 1.5SMC9.1AHM3/I uniquely combines AEC-Q101 qualification, halogen-free compliance, 1500 W surge capability, and SMC surface-mount compatibility - making it the only option qualified for volume automotive electronics production with zero compromise on reliability or manufacturability.
Availability
1.5SMC9.1AHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom power supplies, and consumer USB interface protection requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC9.1AHM3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and power MOSFETs with emphasis on high-reliability and automotive-grade performance.
The 1.5SMC Series was engineered specifically for robust transient suppression in automotive, industrial, and telecom systems - delivering high-power clamping in compact SMC packages with validated AEC-Q101 stress testing and extended temperature operation.
FAQ
What is the breakdown voltage tolerance of the 1.5SMC9.1AHM3/I?
The 1.5SMC9.1AHM3/I has a specified breakdown voltage range of 8.65 V to 9.55 V at 1.0 mA test current, representing ±5% tolerance around the nominal 9.1 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports precise overvoltage margin design in safety-critical automotive circuits.
Is the 1.5SMC9.1AHM3/I suitable for bidirectional signal line protection?
No - the 1.5SMC9.1AHM3/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection (e.g., RS-485, CAN bus), Vishay offers the 1.5SMC9.1CA variant. Using the unidirectional 1.5SMC9.1AHM3/I on AC-coupled or symmetric signal lines risks forward conduction and improper clamping.
Does the 1.5SMC9.1AHM3/I meet automotive qualification standards?
Yes - the "HM3" suffix confirms the 1.5SMC9.1AHM3/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed all required stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114, making it approved for under-hood and cabin applications in passenger vehicles and commercial trucks.
What is the maximum clamping voltage of the 1.5SMC9.1AHM3/I under surge conditions?
The 1.5SMC9.1AHM3/I clamps to a maximum of 13.4 V when subjected to its rated 50 A peak pulse current (IPPM) using the standardized 10/1000 μs waveform. This clamping voltage is guaranteed across the full operating temperature range (-65 °C to +150 °C) and forms the basis for selecting downstream ICs with appropriate absolute maximum ratings.
How does the SMC package of the 1.5SMC9.1AHM3/I compare to SMA in thermal performance?
The SMC (DO-214AB) package of the 1.5SMC9.1AHM3/I provides significantly better thermal dissipation than SMA: RθJA is 75 °C/W versus ~120 °C/W for SMA, and RθJL is 15 °C/W versus ~25 °C/W. This enables the 1.5SMC9.1AHM3/I to sustain higher surge repetition rates and longer pulse durations without exceeding TJ max, especially on PCBs with minimal copper area.
1.5SMC9.1AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 112A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC9.1AHM3/I FAQ
1.How can I place an order for 1.5SMC9.1AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC9.1AHM3/I 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 1.5SMC9.1AHM3/I reliable?
The price and inventory of 1.5SMC9.1AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC9.1AHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC9.1AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC9.1AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC9.1AHM3/I?
1.5SMC9.1AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC9.1AHM3/I 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 1.5SMC9.1AHM3/I?
For technical support, including 1.5SMC9.1AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC9.1AHM3/I requirements.
6.How does Aetrix verify that 1.5SMC9.1AHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC9.1AHM3/I 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 1.5SMC9.1AHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC9.1AHM3/I?
All 1.5SMC9.1AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC9.1AHM3/I, 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 1.5SMC9.1AHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC9.1AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC9.1AHM3/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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