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Vishay General Semiconductor - Diodes Division 1.5SMC33CAHM3_A/I
- Part No.:
- 1.5SMC33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CAHM3_A/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,600
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Product details
Overview
1.5SMC33CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features 33 V standoff voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 45.7 V clamping voltage (VC) at 32.8 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs). It is used to protect automotive sensor signal lines against lightning-induced transients and inductive switching surges.
For engineers reviewing the 1.5SMC33CAHM3_A/I datasheet, 1.5SMC33CAHM3_A/I pinout, 1.5SMC33CAHM3_A/I application, or 1.5SMC33CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for automotive-grade reliability under repetitive surge conditions.
Technical Context
This device operates as a voltage-clamped shunt protector with symmetrical avalanche behavior in both polarities, enabling robust ESD and surge suppression on AC-coupled or differential signal paths. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the SMC package supports automated placement and meets MSL level 1 reflow requirements (260 °C peak).
The 1.5SMC33CAHM3_A/I delivers 1500 W peak pulse power handling with fast response time (<1.0 ns), low incremental surge resistance, and a temperature coefficient of VBR of +0.098 %/°C - critical for maintaining clamping accuracy across automotive operating ranges (−65 °C to +150 °C junction).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse working voltage before conduction begins; defines safe operating margin for protected circuitry. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1 mA - precise avalanche initiation range ensuring predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 45.7 V at 32.8 A (10/1000 μs) - limits transient voltage seen by downstream ICs to safe levels during surge. |
| PPPM (Peak Pulse Power) | 1500 W - energy-handling capacity for standardized lightning/surge waveforms without failure. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient; determines derating needed for sustained power dissipation. |
| TJ max. | +150 °C - maximum junction temperature rating enabling operation in under-hood automotive environments. |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 | One side of symmetrical PN junction; connects to line under protection (e.g., CAN_H or LIN bus). |
| Cathode | Terminal 2 | Other side of symmetrical PN junction; ties to same line or complementary node in bidirectional layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC or differential signals (e.g., RS-485, CAN, LIN) without polarity concerns. |
| 1500 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) with margin when mounted on recommended 8.0 mm × 8.0 mm copper pads. |
| AEC-Q101 qualified & halogen-free | Meets automotive reliability standards and environmental compliance (RoHS, JESD201 Class 2 whisker resistance). |
| Low clamping ratio (VC/VBR ≈ 1.17) | Minimizes voltage overshoot during transients, reducing stress on protected MOSFETs or interface ICs. |
| Fast response time & low leakage | <1 ns turn-on ensures protection before sensitive circuitry is damaged; ID ≤ 1.0 μA at 33 V enables low-power system compatibility. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in engine control modules from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS placed between sensor signal line and ground to clamp transients before reaching ADC input or op-amp buffer. Use Value: Prevents sensor signal corruption and microcontroller reset events caused by 100 V/50 ms load dump spikes. |
Use Scenario: Safeguarding high-speed CAN FD transceivers against ESD (IEC 61000-4-2 ±25 kV) and surge (IEC 61000-4-5 1 kV line-to-ground). IC Role / Device Role / Timing Role: Bidirectional clamping element across CAN_H/CAN_L differential pair to suppress common-mode surges. Use Value: Maintains CAN bit timing integrity by limiting differential voltage excursion to <91.4 V (2×VC), avoiding transceiver latch-up. |
| Industrial PLC I/O Protection | Telecom Line Interface Protection |
|
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary surge limiter on each input channel, placed upstream of optocoupler or Schmitt trigger input stage. Use Value: Enables >100,000 surge cycles at 1 kW without degradation, extending field-replaceable module lifetime. |
Use Scenario: Protecting Ethernet PHY or xDSL line drivers from lightning-induced longitudinal surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Common-mode TVS connected between tip/ring and ground in hybrid coupler interface circuits. Use Value: Limits surge-induced ground bounce to <45.7 V, preventing damage to 3.3 V or 5 V PHY supply rails and reference voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same VWM/VBR/VC specs but in smaller SMB (DO-214AA) package; lower PPPM (600 W) and higher RθJA (110 °C/W). | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for automotive under-hood use due to thermal constraints. | Select when board space is constrained and surge threat level is moderate (e.g., consumer IoT gateways). |
| 1.5KE33CA | Through-hole TO-204AE (DO-201AE); identical electrical specs but larger footprint and manual assembly requirement. | Preferred for prototyping or legacy designs where SMT rework is impractical; lacks AEC-Q101 qualification. | Choose for cost-sensitive industrial controls where AEC-Q101 is not mandated and hand-soldering is acceptable. |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, 1500 W surge rating, and SMC package - making it the only option meeting full automotive production requirements for CAN, LIN, and sensor interfaces without layout or reliability trade-offs.
Availability
1.5SMC33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial PLC I/O modules, and telecom line interface designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5SMC33CAHM3_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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The 1.5SMC Series was developed for high-power, surface-mount transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom systems needing AEC-Q101-compliant, high-energy TVS solutions in compact packages.
FAQ
What is the clamping voltage of the 1.5SMC33CAHM3_A/I at its rated peak pulse current?
The 1.5SMC33CAHM3_A/I has a maximum clamping voltage (VC) of 45.7 V at 32.8 A peak pulse current (IPPM), measured using the standard 10/1000 μs double-exponential waveform. This value ensures downstream components like CAN transceivers or microcontroller I/O pins remain within safe absolute maximum ratings during surge events. The 1.5SMC33CAHM3_A/I maintains this clamping performance across its full operating temperature range (−65 °C to +150 °C).
Is the 1.5SMC33CAHM3_A/I suitable for automotive applications?
Yes, the 1.5SMC33CAHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials - meeting stringent automotive reliability requirements. Its SMC package supports automated placement, and its 1500 W surge rating handles ISO 7637-2 and IEC 61000-4-5 Level 4 threats commonly encountered in vehicle ECUs, body control modules, and ADAS sensor interfaces. The 1.5SMC33CAHM3_A/I is explicitly designated for automotive use via the "HM3" suffix.
How does the bidirectional design of the 1.5SMC33CAHM3_A/I affect its circuit implementation?
The 1.5SMC33CAHM3_A/I has no polarity marking and conducts symmetrically in both directions, making it ideal for protecting AC-coupled or differential signal lines such as CAN_H/CAN_L, RS-485, or LIN bus without requiring orientation verification during placement. Unlike unidirectional TVS diodes, the 1.5SMC33CAHM3_A/I eliminates risk of incorrect installation and simplifies layout by allowing direct connection across any two nodes subject to bidirectional overvoltage stress.
What is the thermal resistance and how does it impact PCB layout for the 1.5SMC33CAHM3_A/I?
The 1.5SMC33CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area and avoid thermal isolation. Reducing pad size or omitting thermal vias increases RθJA, risking premature thermal failure - especially in enclosed automotive enclosures where ambient temperature exceeds 85 °C.
Does the 1.5SMC33CAHM3_A/I meet industry surge immunity standards?
Yes, the 1.5SMC33CAHM3_A/I is engineered to meet IEC 61000-4-5 (surge), IEC 61000-4-2 (ESD), and ISO 7637-2 (automotive transients) requirements when applied with proper PCB layout. Its 1500 W peak pulse power rating corresponds to 4 kV/2 Ω coupling network testing per IEC 61000-4-5 Level 4. The 1.5SMC33CAHM3_A/I's fast response time (<1 ns) and low clamping ratio ensure compliance without additional external filtering in most automotive and industrial implementations.
1.5SMC33CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
1.5SMC33CAHM3_A/I FAQ
1.How can I place an order for 1.5SMC33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CAHM3_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 1.5SMC33CAHM3_A/I reliable?
The price and inventory of 1.5SMC33CAHM3_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 1.5SMC33CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CAHM3_A/I?
1.5SMC33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CAHM3_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 1.5SMC33CAHM3_A/I?
For technical support, including 1.5SMC33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CAHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CAHM3_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 1.5SMC33CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CAHM3_A/I?
All 1.5SMC33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CAHM3_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 1.5SMC33CAHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CAHM3_A/I Tags
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