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Vishay General Semiconductor - Diodes Division SMCJ33CAHM3_A/H
- Part No.:
- SMCJ33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CAHM3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,110
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Product details
Overview
SMCJ33CAHM3_A/H 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 with 33 V standoff voltage (VWM), 53.3 V clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ33CAHM3_A/H datasheet, SMCJ33CAHM3_A/H pinout, SMCJ33CAHM3_A/H application, or SMCJ33CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding its breakdown voltage (VBR min = 36.7 V), it rapidly switches to low-impedance conduction, diverting surge current away from downstream circuitry while limiting voltage across protected nodes to ≤53.3 V. Its glass-passivated junction ensures stable avalanche characteristics and long-term reliability under repetitive surge stress.
Designed for bidirectional operation, SMCJ33CAHM3_A/H exhibits symmetrical electrical behavior in both polarities-no polarity marking on the case-and maintains consistent clamping performance regardless of transient polarity. Thermal resistance (RθJA = 75 °C/W) and junction temperature range (–55 °C to +150 °C) support robust operation in high-ambient environments without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min) | 36.7 V - guaranteed minimum breakdown voltage at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 53.3 V - clamped voltage across device at 28.1 A 10/1000 μs surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak transient power handling capacity, enabling protection against IEC 61000-4-5 Level 4 surges |
| ID @ VWM | 1.0 μA - ultra-low leakage at rated standoff, minimizing standby power loss in battery-powered systems |
| TJ max | +150 °C - maximum junction temperature rating, supporting under-hood automotive use without derating |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMCJ33CAHM3_A/H uses a two-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path (bidirectional) | Completes low-impedance surge shunt loop during either positive or negative transients |
| Cathode | Transient current return path (bidirectional) | Identical functional role to Anode; terminals are electrically symmetric with no directional marking |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards |
| Halogen-free & RoHS-compliant | Meets EU RoHS Directive 2011/65/EU and IEC 61249-2-21; no brominated flame retardants or chlorine-based compounds |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) and higher energy absorption efficiency than standard TVS diodes |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60 % RH; no bake requirement prior to reflow soldering |
| Fast response time | <1.0 ps junction response enables clamping before most ICs experience latch-up or gate oxide damage |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins in body control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing ±100 V/50 A transients while maintaining <53.3 V rail integrity during 10/1000 μs surges. Use Value: Prevents permanent damage to 3.3 V/5 V logic interfaces without adding series impedance or signal delay. | Use Scenario: Safeguarding analog front-end inputs of pressure and temperature sensors in PLC analog input cards subjected to field wiring induced surges. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) bidirectional clamp preserving DC accuracy while suppressing >1 kV transients per IEC 61000-4-5. Use Value: Eliminates need for external RC filtering or precision trimming due to minimal bias current injection. |
| Telecom Line Card Surge Protection | Consumer Device USB/DisplayPort ESD Hardening |
Use Scenario: Front-end protection for Ethernet PHYs and PoE injectors in access switches facing lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: High-power (1500 W) bidirectional suppressor placed across differential pairs to clamp mode conversion transients before transformer saturation. Use Value: Maintains signal integrity up to 1 Gbps by avoiding parasitic capacitance above 100 pF (typical CJ = 120 pF at 0 V). | Use Scenario: Secondary-level surge suppression on USB-C and DisplayPort lanes in laptops and docking stations where primary ESD arrays cannot handle high-energy surges. IC Role / Device Role / Timing Role: Robust secondary clamp with 53.3 V VC limiting transient overshoot below IC absolute maximum ratings during hot-plug events. Use Value: Extends system-level surge immunity beyond IEC 61000-4-2 Level 4 without compromising high-speed signal rise times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CAHE3_A/H | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs | Reduced surge margin; suitable only for sub-IEC 61000-4-5 Level 2 environments | Select when board space is constrained and surge threat level is low (e.g., indoor consumer devices) |
| SMCJ33CA-E3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and RoHS-compliant without halogen-free certification | Lacks automotive qualification; not approved for under-hood or safety-critical vehicle subsystems | Select for cost-sensitive industrial or telecom applications where AEC-Q101 is not mandated |
Compared with SMAJ33CAHE3_A/H and SMCJ33CA-E3/57T, SMCJ33CAHM3_A/H uniquely delivers 1500 W surge capability in an AEC-Q101-qualified, halogen-free package-making it the only option among the three validated for automotive powertrain and chassis modules requiring full ISO 7637-2 compliance.
Availability
SMCJ33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line cards, and consumer device surge protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ33CAHM3_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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency solutions.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where sustained surge immunity and long-term parametric stability are critical.
FAQ
What does the "HM3" suffix indicate in SMCJ33CAHM3_A/H?
The "HM3" suffix in SMCJ33CAHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3") and confirms compliance with automotive reliability standards, material restrictions, and environmental regulations required for under-hood and safety-critical applications. SMCJ33CAHM3_A/H meets JESD201 Class 2 whisker resistance and MSL Level 1 handling requirements.
Is SMCJ33CAHM3_A/H suitable for protecting 3.3 V logic circuits?
Yes, SMCJ33CAHM3_A/H can protect 3.3 V logic circuits when used with appropriate series impedance (e.g., current-limiting resistor or ferrite bead) upstream. Its 33 V standoff voltage prevents conduction during normal operation, while its 53.3 V clamping voltage must be coordinated with the protected IC's absolute maximum rating-typically requiring additional local clamping or voltage translation for direct interface. SMCJ33CAHM3_A/H is intended for primary-level board-edge or power-rail protection, not point-of-load logic pin clamping.
How does the bidirectional design of SMCJ33CAHM3_A/H affect PCB layout?
The bidirectional design of SMCJ33CAHM3_A/H eliminates polarity concerns during placement: no cathode band marking exists, and either terminal may connect to either side of a differential line or ungrounded node. This simplifies layout for AC-coupled interfaces like RS-485 or Ethernet, reduces assembly errors, and avoids orientation-dependent routing constraints. However, thermal pad design must still follow Vishay's recommended 8.0 mm × 8.0 mm copper area per terminal to sustain 1500 W surge capability.
What is the maximum surge current SMCJ33CAHM3_A/H can handle at elevated ambient temperatures?
At TA = 85 °C, SMCJ33CAHM3_A/H retains approximately 70 % of its 25 °C rated peak pulse current (IPPM = 28.1 A), delivering ~19.7 A for a 10/1000 μs waveform. Derating follows Fig. 2 in the datasheet: linear reduction from 100 % at 25 °C to ~50 % at 125 °C. For sustained high-temperature operation, thermal design must ensure junction temperature remains ≤150 °C using the specified RθJA = 75 °C/W and proper copper pour sizing.
Does SMCJ33CAHM3_A/H meet UL 497B recognition?
Yes, SMCJ33CAHM3_A/H carries Underwriters Laboratories recognition under UL 497B (file E136766) for protector classification, confirming suitability for use in telecommunications and data line protection applications. This certification covers both unidirectional and bidirectional variants and validates performance against surge withstand, insulation resistance, and flammability (UL 94 V-0) requirements. The SMC (DO-214AB) molding compound and terminal plating fully comply with UL 497B construction rules.
SMCJ33CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ33CAHM3_A/H FAQ
1.How can I place an order for SMCJ33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CAHM3_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 SMCJ33CAHM3_A/H reliable?
The price and inventory of SMCJ33CAHM3_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 SMCJ33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CAHM3_A/H?
SMCJ33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CAHM3_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 SMCJ33CAHM3_A/H?
For technical support, including SMCJ33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ33CAHM3_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 SMCJ33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ33CAHM3_A/H?
All SMCJ33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CAHM3_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 SMCJ33CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CAHM3_A/H Tags
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