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Vishay General Semiconductor - Diodes Division 1.5SMC33AHM3_A/I
- Part No.:
- 1.5SMC33AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33AHM3_A/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,957
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Product details
Overview
1.5SMC33AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V standoff voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 45.7 V maximum clamping voltage at 32.8 A peak pulse current, and 1500 W peak pulse power capability with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and DC power input stages.
For engineers reviewing the 1.5SMC33AHM3_A/I datasheet, 1.5SMC33AHM3_A/I pinout, 1.5SMC33AHM3_A/I application, or 1.5SMC33AHM3_A/I equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
The 1.5SMC33AHM3_A/I operates as a unidirectional silicon avalanche diode, leveraging glass-passivated junction technology for stable breakdown and low incremental surge resistance. Its clamping action begins at VBR ≥ 37.1 V and limits transient voltages to ≤ 45.7 V at 32.8 A, enabling reliable protection of downstream MOSFETs and microcontrollers against inductive switching spikes and ESD events.
Designed for surface-mount assembly in SMC (DO-214AB) package, it supports automated placement and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The cathode-band polarity marking ensures correct orientation during PCB layout, and its -65 °C to +150 °C operating junction temperature range supports under-hood automotive deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - Maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating ceiling for DC bias conditions. |
| VBR @ IT = 1 mA | 37.1–41.0 V - Breakdown voltage range where device transitions from high-impedance to low-impedance clamping; ensures predictable turn-on under transients. |
| VC @ IPPM = 32.8 A | 45.7 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected ICs or MOSFETs. |
| PPPM | 1500 W - Peak pulse power handling with 0.01% duty cycle; enables suppression of lightning-induced surges per IEC 61000-4-5. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads; guides heatsinking requirements for sustained surge duty. |
| IFSM | 200 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental polarity reversal events. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in high-temperature environments such as engine control units. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential rail; defines reference node for unidirectional clamping. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 24 V supply rail); conducts surge current to ground when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for global OEMs without compromising surge robustness or thermal performance. |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity in industrial and automotive power inputs without external series impedance. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (< 1 ns response), improving protection margin for sensitive logic interfaces. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture-related delamination or popcorn failure. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECU power rails exposed to load-dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 33 V while maintaining low leakage below 28.2 V. Use Value: Limits peak rail voltage to ≤ 45.7 V during 32.8 A transients, preventing damage to 36 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed across noisy motor drive zones in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to shunt ESD and coupled noise before reaching ADC front-end. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) with sub-1 ns response, preserving signal integrity without adding measurable capacitance to <1 MHz signals. |
| Telecom DC Power Feeds | Consumer Device USB Port Surge Guard |
Use Scenario: -48 V telecom rectifier outputs feeding base station RF modules vulnerable to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converters, sized for 1500 W pulse handling and 200 A surge current. Use Value: Withstands 10/1000 µs surges up to 45.7 V, protecting GaN FETs and PLLs rated for ≤ 50 V absolute maximum ratings. |
Use Scenario: USB Type-C power delivery (PD) ports in laptops and docking stations subjected to hot-plug transients and cable coupling. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line to suppress positive-going surges while allowing normal 5–20 V PD negotiation. Use Value: Maintains 28.2 V working voltage margin above 20 V PD max, clamping faults to 45.7 V before eFuse or controller shutdown triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52 | Same VWM (28.2 V) and VC (45.7 V), but lower PPPM (600 W) and SMB package (smaller footprint, higher RθJA). | Limited to lower-energy transients (e.g., IEC 61000-4-2 only); unsuitable for ISO 7637-2 load dump or IEC 61000-4-5 Level 3+. | Select when board space is constrained and surge energy is ≤ 600 W; verify thermal derating for ambient > 70 °C. |
| 1.5KE33A | Through-hole DO-15 package, identical electrical specs (VWM, VBR, VC, PPPM), but no AEC-Q101 or halogen-free certification. | Acceptable for commercial/industrial use but not approved for automotive production; requires manual insertion or wave soldering. | Choose for legacy through-hole designs or cost-sensitive non-automotive applications where surface-mount is not required. |
Compared with SMBJ33A-E3/52 and 1.5KE33A, the 1.5SMC33AHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free compliance, and full 1500 W surge capability in an SMC package - making it the only option qualified for volume automotive power rail protection without layout or reliability trade-offs.
Availability
1.5SMC33AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and certified surge robustness.
Supply support for 1.5SMC33AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 validation, 1500 W pulse handling, and surface-mount manufacturability are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC33AHM3_A/I under a 10/1000 µs surge?
The 1.5SMC33AHM3_A/I clamps to a maximum of 45.7 V when subjected to its rated peak pulse current of 32.8 A with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The 1.5SMC33AHM3_A/I maintains this clamping performance consistently across its qualified temperature range.
Is the 1.5SMC33AHM3_A/I qualified for automotive applications?
Yes, the 1.5SMC33AHM3_A/I carries AEC-Q101 qualification, confirmed by its HM3 suffix and documentation in Vishay's 1.5SMC Series datasheet (Document Number: 88303, Revision: 09-Mar-2026). This qualification covers stress tests including HTGB, H3TRB, and temperature cycling - validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS power supplies.
What does the "HM3" suffix indicate for the 1.5SMC33AHM3_A/I?
The "HM3" suffix on the 1.5SMC33AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from commercial-grade variants (e.g., "E3" or "M3") and confirms compliance with automotive environmental and reliability standards. The "_A/I" further specifies packaging in 13-inch tape-and-reel format (I) and revision level A, per Vishay's ordering information table.
How does the 1.5SMC33AHM3_A/I compare to bidirectional TVS diodes like 1.5SMC33CA?
The 1.5SMC33AHM3_A/I is unidirectional and intended for DC-biased lines where only positive-going transients require suppression - such as 24 V power rails. In contrast, 1.5SMC33CA is bidirectional and suited for AC-coupled or floating signal lines (e.g., RS-485, CAN). The 1.5SMC33AHM3_A/I offers identical VWM, VBR, and PPPM ratings but lacks symmetrical clamping; using it in place of a bidirectional device would leave negative transients unprotected.
What is the maximum operating temperature for the 1.5SMC33AHM3_A/I?
The 1.5SMC33AHM3_A/I has a specified operating junction temperature range of -65 °C to +150 °C. Its thermal resistance (RθJA = 75 °C/W) allows direct calculation of allowable power dissipation at elevated ambient temperatures - for example, at TA = 100 °C, derated power drops to ~2.2 W. This wide range supports deployment in engine compartments and industrial enclosures without active cooling.
1.5SMC33AHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 32.8A
- 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)
1.5SMC33AHM3_A/I FAQ
1.How can I place an order for 1.5SMC33AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33AHM3_A/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 1.5SMC33AHM3_A/I reliable?
The price and inventory of 1.5SMC33AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC33AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33AHM3_A/I?
1.5SMC33AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33AHM3_A/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 1.5SMC33AHM3_A/I?
For technical support, including 1.5SMC33AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33AHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC33AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33AHM3_A/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 1.5SMC33AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC33AHM3_A/I?
All 1.5SMC33AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33AHM3_A/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 1.5SMC33AHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC33AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33AHM3_A/I Tags
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