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Vishay General Semiconductor - Diodes Division 1.5SMC33CAHM3_A/H
- Part No.:
- 1.5SMC33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CAHM3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,800
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Product details
Overview
1.5SMC33CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V standoff voltage (VWM), 36.7 V minimum breakdown voltage (VBR), 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 - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the 1.5SMC33CAHM3_A/H datasheet, 1.5SMC33CAHM3_A/H pinout, 1.5SMC33CAHM3_A/H application, or 1.5SMC33CAHM3_A/H equivalent, key selection criteria include bidirectional clamping performance under lightning surge (IEC 61000-4-5), AEC-Q101 qualification status, SMC (DO-214AB) package thermal resistance (RθJL = 15 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient events exceeding VWM (33 V), it avalanches symmetrically in both directions to clamp voltage at ≤45.7 V while diverting up to 32.8 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at VWM).
Designed for automated SMT assembly, it meets MSL Level 1 (260 °C peak reflow), JESD 201 Class 2 whisker resistance, and UL 94 V-0 flammability. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - validated for automotive-grade reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 33 V - maximum continuous reverse working voltage before clamping initiates |
| VBR (Breakdown) | 36.7–40.7 V at 1 mA - guaranteed avalanche onset range defining protection threshold precision |
| VC (Clamping) | 45.7 V at 32.8 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge |
| PPPM | 1500 W - surge energy handling capacity compliant with IEC 61000-4-5 Level 4 (4 kV) |
| Package | SMC (DO-214AB) - 7.75 mm × 6.22 mm footprint with 1.52 mm min. lead length for thermal relief |
| Temperature Range | −65 °C to +150 °C - supports under-hood automotive and industrial ambient extremes |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant (HM3 suffix), UL 497B recognized (QVGQ2) |
Pinout & Package
Package: SMC (DO-214AB) - surface-mount, bidirectional device with no polarity marking; symmetrical terminals optimized for PCB thermal dissipation using 8.0 mm × 8.0 mm copper pads per lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically - no cathode band; enables placement flexibility on PCB without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN FD) without polarity concerns |
| 1500 W peak pulse power | Withstands 4 kV IEC 61000-4-5 surge (line-to-ground) without degradation when mounted per recommended pad layout |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring lifetime reliability |
| Halogen-free & RoHS | HM3 suffix guarantees compliance with EU RoHS Directive 2011/65/EU and JEDEC JS709E halogen limits (<900 ppm Cl, <900 ppm Br) |
| Low clamping ratio (VC/VBR) | 1.25 typical - tight voltage margin between breakdown and clamping improves system-level surge margin vs. legacy TVS devices |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature/pressure sensors exposed to load-dump and ISO 7637-2 pulses in vehicle cabins. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector entry point to clamp transients before reaching ASIC input pins. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor interface ICs during 100 V/100 ms load dump events. |
Use Scenario: Safeguarding 24 V DC digital input modules against field-wiring induced surges and ESD in factory automation cabinets. IC Role / Device Role / Timing Role: Primary front-end protection stage ahead of optocoupler or Schmitt-trigger input conditioning circuits. Use Value: Maintains functional safety integrity (IEC 61000-4-4/5 Level 3) without derating or parallel staging. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional clamping element across transformer secondary windings or data pair lines. Use Value: Limits induced common-mode voltage to <45.7 V, preserving isolation barrier integrity and preventing PHY reset. |
Use Scenario: Secondary-side overvoltage suppression on 12 V/19 V DC outputs of laptop adapters subject to open-load transients. IC Role / Device Role / Timing Role: Fast-response shunt limiter placed after DC-DC converter output filter capacitor. Use Value: Absorbs 1500 W surge energy within 1 μs, preventing downstream regulator latch-off or capacitor overvoltage failure. |
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 | Lower PPPM (600 W), same VWM/VC, SMB package (smaller thermal mass) | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for automotive load-dump | Select when board space is constrained and surge threat level is ≤1 kV |
| 1.5KE33CA | Through-hole TO-218 package, identical electrical specs, higher RθJA (50 °C/W) | Requires wave soldering; less suitable for high-density SMT production or vibration-prone environments | Choose only for legacy through-hole designs or where manual repair access is prioritized over AEC-Q101 compliance |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CAHM3_A/H delivers automotive-grade reliability in a compact SMT package with superior thermal coupling (RθJL = 15 °C/W) and full IEC 61000-4-5 Level 4 surge immunity - making it the preferred choice for new automotive and industrial designs requiring AEC-Q101 validation and 1500 W surge headroom.
Availability
1.5SMC33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface circuits requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for 1.5SMC33CAHM3_A/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for high-power, surface-mount transient suppression in space-constrained and thermally demanding applications - emphasizing AEC-Q101 qualification, bidirectional symmetry, and repeatable clamping performance across temperature.
FAQ
What does the 'HM3' suffix indicate in 1.5SMC33CAHM3_A/H?
The HM3 suffix in 1.5SMC33CAHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - verified per JESD22-A114 stress testing and certified for automotive under-hood use. It also confirms compliance with JEDEC JS709E halogen limits and UL 497B recognition (QVGQ2), distinguishing it from commercial-grade M3 or E3 variants.
Is 1.5SMC33CAHM3_A/H suitable for protecting CAN FD bus lines?
Yes, 1.5SMC33CAHM3_A/H is appropriate for CAN FD bus protection due to its bidirectional clamping, 33 V standoff voltage matching typical 24 V CAN FD supply rails, and fast response time (<1 ns). Its 45.7 V clamping voltage ensures transceiver ICs (e.g., TCAN1042) remain within absolute maximum ratings during ISO 16750-2 surges, provided layout follows Vishay's recommended 8.0 mm × 8.0 mm copper pads.
How does the clamping voltage of 1.5SMC33CAHM3_A/H compare to its unidirectional counterpart 1.5SMC33AHM3_A/H?
The 1.5SMC33CAHM3_A/H has identical clamping voltage (45.7 V at 32.8 A) and breakdown range (36.7–40.7 V) as the unidirectional 1.5SMC33AHM3_A/H. However, the CA version provides symmetrical protection for AC or differential signals, whereas the A version requires correct polarity alignment and cannot protect reverse-polarity transients - making CA essential for RS-485, USB, or Ethernet applications.
What is the maximum allowable PCB pad size for optimal thermal performance of 1.5SMC33CAHM3_A/H?
Vishay specifies 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for 1.5SMC33CAHM3_A/H to achieve rated 1500 W peak pulse power. Smaller pads reduce thermal dissipation and cause premature failure under repetitive surges; larger pads yield diminishing returns beyond 10 mm × 10 mm due to SMC package leadframe limitations. Thermal resistance drops from 75 °C/W (junction-to-ambient) to ~15 °C/W (junction-to-leads) with this layout.
Does 1.5SMC33CAHM3_A/H require derating at elevated ambient temperatures?
Yes, 1.5SMC33CAHM3_A/H must be derated above TA = 25 °C per Figure 2 in Vishay document 88303: peak pulse power decreases linearly to 50 % at TJ = 125 °C, and maximum operating junction temperature remains 150 °C. For continuous operation at 85 °C ambient, ensure power dissipation stays below 3.25 W (50 % of 6.5 W PD rating) and verify clamping performance via transient simulation with thermal boundary conditions.
1.5SMC33CAHM3_A/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:
- 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/H FAQ
1.How can I place an order for 1.5SMC33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CAHM3_A/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 1.5SMC33CAHM3_A/H reliable?
The price and inventory of 1.5SMC33CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CAHM3_A/H?
1.5SMC33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CAHM3_A/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 1.5SMC33CAHM3_A/H?
For technical support, including 1.5SMC33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CAHM3_A/H requirements.
6.How does Aetrix verify that 1.5SMC33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CAHM3_A/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 1.5SMC33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CAHM3_A/H?
All 1.5SMC33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CAHM3_A/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 1.5SMC33CAHM3_A/H part is unused and in its original packaging.
Return procedure for 1.5SMC33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CAHM3_A/H Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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