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Vishay General Semiconductor - Diodes Division SMB8J33CAHM3_A/I
- Part No.:
- SMB8J33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J33CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 33 V stand-off voltage (VWM), 53.3 V clamping voltage (VC) at 15 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J33CAHM3_A/I datasheet, SMB8J33CAHM3_A/I pinout, SMB8J33CAHM3_A/I application, or SMB8J33CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 33 V working voltage compatibility with 3.3 V–24 V systems, thermal resistance (RθJA = 72 °C/W), and halogen-free RoHS-compliant construction per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while the bidirectional configuration enables symmetric clamping across both polarities without polarity dependency.
Designed for surface-mount automated assembly, it meets MSL level 1 (260 °C peak reflow) and supports operation from –55 °C to +150 °C junction temperature. The device complies with ANSI/IEEE C62.35 standards for surge suppression and delivers low incremental surge resistance for minimal voltage overshoot during high-current transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 24 V nominal systems |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - verified breakdown threshold range ensuring consistent turn-on across production lots |
| VC @ IPPM | 53.3 V at 15 A - clamping voltage under 10/1000 µs surge; limits downstream IC stress to safe levels |
| PPPM | 800 W - peak pulse power handling capacity; sustains IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated stand-off voltage; avoids signal integrity degradation in high-impedance circuits |
| TJ max | +150 °C - extended junction temperature rating enabling use in under-hood automotive environments |
| RθJA | 72 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identical clamping function; no cathode band - enables layout flexibility and eliminates orientation errors during placement |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance - suitable for consumer and industrial end products |
| Low-profile SMB package | Height ≤ 2.2 mm - enables compact PCB layouts in space-constrained modules such as sensor hubs and motor drivers |
| Fast response time (<1 ps) | Clamps transients before sensitive ICs experience overvoltage damage - critical for protecting CAN, LIN, and analog sensor front-ends |
| 800 W peak pulse power | Withstands repeated 10/1000 µs surges up to 15 A - exceeds IEC 61000-4-5 requirements for industrial equipment ports |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting ABS wheel speed sensors and cabin temperature sensors from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing >400 V transients while maintaining signal fidelity on low-voltage analog outputs. Use Value: Prevents sensor IC latch-up or permanent damage during battery disconnection events - extends field reliability in harsh vehicle environments. | Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring exposed to relay coil kickback. IC Role / Device Role / Timing Role: Fast-acting voltage limiter diverting surge energy away from optocoupler inputs and microcontroller GPIOs. Use Value: Eliminates need for external series resistors or RC filters - reduces BOM count and improves system response time to real-time inputs. |
| USB-C Power Delivery Interface | Motor Drive Gate Driver Protection |
Use Scenario: Clamping voltage spikes on VBUS and CC lines during hot-plug events and ESD discharge in USB-C PD adapters. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed directly at connector entry point to limit voltage excursions below 53.3 V. Use Value: Ensures compliance with USB-IF ESD immunity requirements (±15 kV air, ±8 kV contact) without degrading high-speed data integrity. | Use Scenario: Shielding high-side and low-side gate drivers in BLDC inverters from Miller-induced shoot-through spikes during fast switching. IC Role / Device Role / Timing Role: Clamp placed across driver supply rails (e.g., VDD–VEE) to suppress ringing and cross-talk between half-bridges. Use Value: Reduces false triggering of protection circuits and improves inverter efficiency by minimizing unnecessary shutdown cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J33CAHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (not halogen-free); lacks JESD201 Class 2 whisker resistance | Approved for non-automotive industrial and computing applications where halogen content is unrestricted | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not mandated |
| SMAJ33CAHM3 | Lower PPPM (400 W), smaller SMA package (DO-214AC); higher RθJA (110 °C/W) | Suitable for lower-energy surges in space-constrained consumer electronics, not recommended for automotive or industrial mains-connected ports | Choose only for secondary protection layers or low-duty-cycle signal lines where 800 W headroom is unnecessary |
Compared with SMB8J33CAHE3_A/I and SMAJ33CAHM3, the SMB8J33CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 800 W surge capacity in the robust SMB footprint - making it the preferred choice for primary protection in automotive and industrial power interfaces requiring long-term reliability and regulatory compliance.
Availability
SMB8J33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial programmable logic controllers, and USB-C power delivery designs requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMB8J33CAHM3_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, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade performance.
The SMB8JxxCA family targets high-energy transient suppression in demanding environments - engineered specifically for AEC-Q101 compliance, low clamping voltage, and compatibility with automated SMT assembly in automotive and industrial control systems.
FAQ
What is the clamping voltage of SMB8J33CAHM3_A/I and how is it measured?
The SMB8J33CAHM3_A/I has a maximum clamping voltage (VC) of 53.3 V at 15 A peak pulse current (IPPM) using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards with the device mounted on 0.2" × 0.2" copper pads. The clamping voltage defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMB8J33CAHM3_A/I maintains this VC consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMB8J33CAHM3_A/I suitable for automotive applications?
Yes, SMB8J33CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It supports junction temperatures from –55 °C to +150 °C and meets MSL level 1 reflow requirements. The SMB8J33CAHM3_A/I is specified for protection of engine control units, ADAS camera modules, and body electronics against ISO 7637-2 and ISO 16750-2 transients. Its bidirectional symmetry and low leakage make it ideal for CAN FD and LIN bus line protection.
How does the SMB8J33CAHM3_A/I differ from unidirectional TVS diodes like SMB10J33A?
The SMB8J33CAHM3_A/I is bidirectional, providing symmetrical clamping for both positive and negative transients without polarity constraints - unlike unidirectional SMB10J33A, which requires correct cathode orientation and only protects one polarity. SMB8J33CAHM3_A/I offers 800 W PPPM vs. 1000 W for SMB10J33A but achieves this in a more compact thermal profile (RθJA = 72 °C/W). Its 1.0 µA leakage at 33 V matches SMB10J33A, but the bidirectional architecture makes SMB8J33CAHM3_A/I preferable for AC-coupled or floating signal lines such as USB, RS-485, and sensor bridges.
What is the meaning of the "HM3" suffix in SMB8J33CAHM3_A/I?
The "HM3" suffix in SMB8J33CAHM3_A/I denotes halogen-free, RoHS-compliant construction meeting JEDEC JESD201 Class 2 whisker resistance requirements. It distinguishes the part from E3 (RoHS-compliant commercial grade) and HE3 (AEC-Q101 qualified, non-halogen-free) variants. The "H" indicates AEC-Q101 qualification; "M3" confirms halogen-free materials and enhanced metallurgical stability. The "_A/I" denotes packaging: "A" = 7" tape-and-reel (750 pcs), "I" = 13" tape-and-reel (3200 pcs). This coding ensures full compliance traceability for automotive and industrial customers.
Can SMB8J33CAHM3_A/I be used in parallel for higher surge current handling?
No, SMB8J33CAHM3_A/I should not be paralleled without external balancing components. Due to manufacturing tolerances in breakdown voltage (VBR min/max = 36.7 V / 40.6 V), paralleling multiple units risks current hogging - where one device conducts most of the surge energy and fails prematurely. For higher surge ratings, select a single higher-power device such as SMB10J33CAHM3_A/I (1000 W) or consult Vishay's application note AN8002 on TVS derating and layout practices. Proper PCB layout with equal trace lengths and symmetric copper pours remains essential even when using a single SMB8J33CAHM3_A/I.
SMB8J33CAHM3_A/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:
- Obsolete
- 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):
- 15A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J33CAHM3_A/I FAQ
1.How can I place an order for SMB8J33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHM3_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 SMB8J33CAHM3_A/I reliable?
The price and inventory of SMB8J33CAHM3_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 SMB8J33CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHM3_A/I?
SMB8J33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHM3_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 SMB8J33CAHM3_A/I?
For technical support, including SMB8J33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHM3_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 SMB8J33CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHM3_A/I?
All SMB8J33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHM3_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 SMB8J33CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHM3_A/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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