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Vishay General Semiconductor - Diodes Division 1.5SMC33AHM3/H
- Part No.:
- 1.5SMC33AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33AHM3/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
1.5SMC33AHM3/H 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 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 28.2 V stand-off voltage (VWM), 45.7 V maximum clamping voltage (VC) at 32.8 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 µs waveform - ideal for safeguarding automotive sensor signal lines against lightning-induced transients and inductive switching spikes.
For engineers reviewing the 1.5SMC33AHM3/H datasheet, 1.5SMC33AHM3/H pinout, 1.5SMC33AHM3/H application, or 1.5SMC33AHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), polarity marking (cathode band), and halogen-free RoHS-compliant construction - all critical for automotive-grade ESD/surge protection design-in and BOM validation.
Technical Context
The 1.5SMC33AHM3/H operates as a unidirectional avalanche diode, clamping transient overvoltages above its reverse stand-off voltage (28.2 V) by entering avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and surge events per IEC 61000-4-2/4-5.
Rated for 150 °C maximum junction temperature and qualified to AEC-Q101, it supports automotive under-hood and ADAS sensor interfaces where reliability under thermal cycling and repetitive surge stress is mandatory. The SMC package provides robust mechanical mounting and meets UL 94 V-0 flammability rating with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - defines precise avalanche onset threshold for repeatable clamping behavior |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 45.7 V at 32.8 A - clamping voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 1500 W - peak pulse power handling capacity, enabling protection against IEC 61000-4-5 Level 4 surges |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing (8.0 mm × 8.0 mm recommended) |
| TJ max. | +150 °C - maximum junction temperature, supporting operation in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and surge endurance |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, with cathode indicated by a band on the body. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); terminals are matte tin-plated for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Avalanche clamping terminal | Marked with band; connected to protected line (e.g., CAN_H, LIN, sensor output) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) in industrial and automotive systems |
| AEC-Q101 qualification | Validates long-term reliability for automotive applications including engine control, ADAS sensors, and infotainment interfaces |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 µA at VWM) across temperature and lifetime |
| Low RθJA (75 °C/W) | Allows effective heat dissipation on standard FR-4 PCBs without heatsinks, reducing board area and cost |
| Halogen-free & RoHS | Fulfills environmental compliance requirements for global automotive OEMs and Tier 1 suppliers |
Applications
| Automotive Sensor Protection | CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure, temperature, and position sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground to clamp positive transients. Use Value: Limits voltage seen by downstream ADC or microcontroller input to ≤45.7 V during 32.8 A surges, preventing latch-up or damage. |
Use Scenario: Safeguarding CAN_H and CAN_L lines in vehicle networking against ESD (IEC 61000-4-2) and coupled surges (ISO 7637-3). IC Role / Device Role / Timing Role: Two 1.5SMC33AHM3/H devices used in unidirectional configuration - one per line - referenced to ground. Use Value: Clamps transients within nanoseconds while maintaining <1 pF junction capacitance impact on CAN signal integrity at 1 Mbps. |
| Industrial PLC I/O Protection | Power Supply Input Protection |
Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Placed between field-side terminal and optocoupler input, with cathode tied to input line. Use Value: Absorbs 1500 W pulses without degradation, ensuring >100,000 surge cycles per AEC-Q101 accelerated life testing. |
Use Scenario: Secondary-level surge suppression on 24 V DC input rails of motor drives and embedded controllers after primary MOV protection. IC Role / Device Role / Timing Role: Unidirectional clamping device between +24 V rail and ground, triggered only during overvoltage events. Use Value: Provides precise 28.2 V stand-off to avoid false triggering during normal 24 V ±10% operation while clamping to 45.7 V during surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Same VWM/VBR/VC, but SMA package (smaller footprint, lower PPPM = 400 W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when space-constrained and surge energy ≤400 W suffices |
| 1.5KE33A | Through-hole DO-201 package, identical electrical specs, no AEC-Q101 qualification | Not approved for automotive production; requires manual assembly | Choose for prototyping or non-automotive industrial use where automated SMT is not required |
Compared with SMAJ33A-E3/57T and 1.5KE33A, the 1.5SMC33AHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and SMC surface-mount compatibility - making it the only option qualified for volume automotive production requiring both high-energy clamping and automated assembly.
Availability
1.5SMC33AHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus hardening, industrial PLC I/O hardening, and 24 V DC power supply surge suppression requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for 1.5SMC33AHM3/H 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 performance.
The 1.5SMC Series was developed specifically for high-power, surface-mount transient suppression in automotive, industrial, and telecom systems - prioritizing AEC-Q101 qualification, low clamping ratio, and robust thermal performance in compact SMC packaging.
FAQ
What is the clamping voltage of the 1.5SMC33AHM3/H under a 10/1000 µs surge?
The 1.5SMC33AHM3/H has a maximum clamping voltage (VC) of 45.7 V at 32.8 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88303 and defines the upper voltage limit imposed on protected circuits during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC33AHM3/H qualified for automotive applications?
Yes, the 1.5SMC33AHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's 1.5SMC Series datasheet (Rev. 09-Mar-2026). This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and surge endurance - validating its suitability for production automotive systems such as ADAS sensors and body control modules.
What does the "HM3" suffix indicate in 1.5SMC33AHM3/H?
The "HM3" suffix in 1.5SMC33AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information, HM3 parts meet JESD 201 Class 2 whisker resistance and are supplied on 7" tape-and-reel (H) - distinguishing them from commercial-grade M3 or HE3 variants and confirming compliance with automotive environmental and reliability standards.
How is polarity identified on the 1.5SMC33AHM3/H package?
The 1.5SMC33AHM3/H uses a cathode band marking on the SMC (DO-214AB) body to indicate polarity. As a unidirectional TVS, the banded end is the cathode and must be connected to the line being protected (e.g., CAN_H), while the anode connects to ground. This marking is visible under standard optical inspection and aligns with JEDEC DO-214AB mechanical drawings in the datasheet.
What is the thermal resistance of the 1.5SMC33AHM3/H, and how does it affect PCB layout?
The 1.5SMC33AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay document 88303. To maintain safe junction temperatures under repetitive surges, designers must allocate adequate copper area - reducing RθJA improves power handling and extends device lifetime in thermally demanding automotive environments.
1.5SMC33AHM3/H 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):
- 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/H FAQ
1.How can I place an order for 1.5SMC33AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33AHM3/H 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/H reliable?
The price and inventory of 1.5SMC33AHM3/H 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/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC33AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33AHM3/H?
1.5SMC33AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33AHM3/H 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/H?
For technical support, including 1.5SMC33AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33AHM3/H requirements.
6.How does Aetrix verify that 1.5SMC33AHM3/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33AHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC33AHM3/H?
All 1.5SMC33AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33AHM3/H, 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/H part is unused and in its original packaging.
Return procedure for 1.5SMC33AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33AHM3/H Tags
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