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Vishay General Semiconductor - Diodes Division SMBJ33CAHM3/I
- Part No.:
- SMBJ33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,026
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Product details
Overview
SMBJ33CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBJ33CAHM3/I datasheet, SMBJ33CAHM3/I pinout, SMBJ33CAHM3/I application, or SMBJ33CAHM3/I equivalent, this device is selected for robust bidirectional surge protection where low clamping voltage, fast response time (<1 ns), and AEC-Q101 qualification (via HM3 suffix) are required in automotive and industrial control systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 36.7 V to 40.6 V at 1 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, delivering consistent VC ≤ 53.3 V up to IPPM = 11.3 A while maintaining low incremental surge resistance.
The device uses a glass-passivated silicon junction and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive-grade reliability in engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 36.7 V / 40.6 V at IT = 1 mA - ensures reliable bidirectional breakdown within tight tolerance |
| VC @ IPPM | 53.3 V at 11.3 A - low clamping voltage limits stress on downstream ICs during surge events |
| PPPM | 600 W - handles high-energy transients such as ISO 7637-2 pulse 1/2a/5a in automotive environments |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity in high-impedance sensor lines |
| TJ max | +150 °C - supports operation in under-hood automotive and industrial ambient conditions |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B standard pads |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; dimensions 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side not applicable) | One side of symmetrical junction - connects to protected line without polarity constraint |
| Anode/Cathode (bidirectional) | Terminal 2 (opposite end) | Second terminal of symmetrical structure - enables clamping in both voltage polarities |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands repetitive 10/1000 µs surges at 0.01% duty cycle - suitable for CAN bus and RS-485 transceivers |
| AEC-Q101 qualified (HM3) | Validated for automotive applications including powertrain and chassis modules per stress test requirements |
| MSL Level 1 | Supports lead-free reflow up to 260 °C without moisture-induced failure - eliminates bake requirement pre-assembly |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors |
Applications
| Automotive Body Control Module (BCM) | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protecting LIN bus transceivers from load dump and alternator ripple in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN data line to clamp ±100 V transients without disrupting DC bias. Use Value: SMBJ33CAHM3/I's 53.3 V clamping ensures transceiver input stays below absolute maximum rating during ISO 16750-2 pulse 5a testing. |
Use Scenario: Shielding RS-485 differential pair in factory automation PLC I/O cards from EFT and surge coupling. IC Role / Device Role / Timing Role: Paired devices across A/B lines and common-mode to ground, suppressing common- and differential-mode transients. Use Value: 11.3 A IPPM and 600 W PPPM meet IEC 61000-4-5 Level 3 (1 kV/2 Ω) requirements with margin. |
| Consumer Appliance Motor Drive Interface | Medical Sensor Signal Conditioning Input |
Use Scenario: Guarding microcontroller GPIOs connected to brushed DC motor feedback lines in smart HVAC systems. IC Role / Device Role / Timing Role: TVS placed between motor encoder output and MCU input to absorb commutation spikes. Use Value: 33 V VWM aligns with 24 V supply rail; sub-1 ns response prevents latch-up in 3.3 V logic inputs. |
Use Scenario: Protecting analog front-end of patient monitoring ECG amplifier from electrostatic discharge during handling. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) bidirectional clamp on differential sensor inputs referenced to isolated ground. Use Value: Ultra-low ID preserves gain accuracy and offset stability in high-impedance instrumentation amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CAHE3/I | RoHS-compliant but not AEC-Q101 qualified; same VWM, VC, and PPPM specs | Approved for commercial/industrial use only; excluded from automotive production BOMs requiring AEC-Q101 | Select when cost sensitivity outweighs automotive qualification requirements |
| SMAJ33CAHM3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), identical VWM and VC | Limited to lower-energy transients; unsuitable for ISO 7637-2 pulse 5a or IEC 61000-4-5 Level 4 | Choose only if board space constraints prevent SMB footprint and surge energy is ≤400 W |
Compared with SMBJ33CAHE3/I and SMAJ33CAHM3, the SMBJ33CAHM3/I uniquely combines AEC-Q101 qualification, 600 W surge capability, and SMB package thermal performance - making it the sole option for automotive-grade 33 V bidirectional protection where reliability and energy handling are co-constrained.
Availability
SMBJ33CAHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication ports, motor drive interfaces, and medical sensor inputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ33CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and communications infrastructure - engineered for precise clamping, low leakage, and robust surge endurance in harsh environments.
FAQ
What does the "CA" suffix indicate in SMBJ33CAHM3/I?
The "CA" suffix denotes a bidirectional configuration: SMBJ33CAHM3/I provides symmetrical clamping for both positive and negative voltage transients, unlike unidirectional variants (e.g., SMBJ33AHM3/I) that clamp only in reverse bias. This makes SMBJ33CAHM3/I ideal for AC-coupled lines, differential buses like RS-485, or any application where polarity reversal is possible during surge events.
Is SMBJ33CAHM3/I suitable for protecting a 3.3 V microcontroller I/O pin?
No - SMBJ33CAHM3/I is not appropriate for direct 3.3 V logic protection because its 33 V standoff voltage (VWM) is far above the IO's absolute maximum rating. Using SMBJ33CAHM3/I would allow damaging voltages to reach the IC before clamping activates. For 3.3 V rails, lower-VWM devices such as SMBJ5.0CAHM3/I (VWM = 5.0 V) must be selected instead.
How does the HM3 suffix affect SMBJ33CAHM3/I's compliance status?
The HM3 suffix certifies that SMBJ33CAHM3/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified - meeting automotive stress test requirements including temperature cycling, humidity bias HAST, and mechanical shock. This distinguishes it from base M3 (halogen-free/RoHS only) and HE3 (RoHS/AEC-Q101 but not halogen-free) variants.
What is the maximum recommended PCB pad size for SMBJ33CAHM3/I per Vishay?
Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W peak pulse power. Smaller pads reduce thermal dissipation and cause derating of IPPM and PPPM - for example, at TA = 85 °C, the device must be derated per Figure 2 in Document 88392 to maintain safe junction temperature.
Can SMBJ33CAHM3/I replace SMBJ33AHE3/I in an existing design?
No - SMBJ33CAHM3/I is bidirectional while SMBJ33AHE3/I is unidirectional; substituting them without circuit review risks improper clamping during positive transients. Additionally, SMBJ33CAHM3/I has different marking (CM vs. CK) and lacks cathode band identification. Layout and schematic changes are required to validate functionality and polarity alignment.
SMBJ33CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 11.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ33CAHM3/I FAQ
1.How can I place an order for SMBJ33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHM3/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 SMBJ33CAHM3/I reliable?
The price and inventory of SMBJ33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHM3/I?
SMBJ33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHM3/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 SMBJ33CAHM3/I?
For technical support, including SMBJ33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHM3/I requirements.
6.How does Aetrix verify that SMBJ33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHM3/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 SMBJ33CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHM3/I?
All SMBJ33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHM3/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 SMBJ33CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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