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Vishay General Semiconductor - Diodes Division SMBJ33CAHE3_B/H
- Part No.:
- SMBJ33CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHE3_B/H.pdf
- Description:
- 600W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,505
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Product details
Overview
SMBJ33CAHE3_B/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ33CAHE3_B/H datasheet, SMBJ33CAHE3_B/H pinout, SMBJ33CAHE3_B/H application, or SMBJ33CAHE3_B/H equivalent, this device is evaluated for ESD and surge immunity in automotive-grade sensor modules, DC power input stages, and bidirectional data line protection where low clamping ratio and AEC-Q101 qualification are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while the 0.100 %/°C temperature coefficient of VBR maintains predictable threshold drift over -55 °C to +150 °C operating range.
The device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is qualified to AEC-Q101 - confirming suitability for automotive under-hood and infotainment subsystems requiring long-term reliability under thermal cycling and mechanical stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse working voltage before conduction begins; 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 11.3 A - clamping voltage limits downstream IC stress during 10/1000 µs surge events. |
| PPPM | 600 W - peak pulse power handling capability with 0.01 % duty cycle; supports repetitive surge immunity in motor drive feedback paths. |
| Junction Temp | -55 °C to +150 °C - enables deployment in engine control units and industrial PLCs without derating below ambient. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height for automated assembly. |
| AEC-Q101 | Qualified - validated for automotive applications including powertrain sensors and body electronics per stress test requirements. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking - symmetrical terminals allow either end to connect to protected line or ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts during overvoltage in either direction - no cathode band marking required. |
| Case (body) | Thermal and mechanical interface | Plastic-molded SMB case provides UL 94 V-0 flammability rating and 20 °C/W junction-to-lead thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs) without polarity concerns. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 24 V supply rails when mounted on 5 mm × 5 mm copper pads. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock - eliminates need for additional qualification testing. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during fast transients, protecting 3.3 V/5 V logic inputs even when placed downstream of LDO regulators. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (260 °C peak) without baking - reduces manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Sensor Interface | Industrial 24 V Power Input |
|---|---|
|
Use Scenario: Protecting analog output pins of pressure/temperature sensors in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp limiting transient excursions to ≤53.3 V during 100 V/50 ms load dump events. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC front-ends while maintaining signal integrity within ±0.5% full-scale error. |
Use Scenario: Safeguarding DC-DC converter inputs in programmable logic controllers subjected to inductive switching noise from solenoid drivers. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) shunt element diverting >10 A surge currents away from primary-side MOSFETs and controller ICs. Use Value: Enables compliance with IEC 61000-4-4 electrical fast transient immunity (EFT) at 4 kV without adding bulk capacitance that degrades dynamic response. |
| RS-485 Communication Line | USB Type-C VBUS Protection |
|
Use Scenario: Shielding half-duplex differential bus lines in factory automation networks against cable discharge events and lightning-induced surges. IC Role / Device Role / Timing Role: Symmetrical clamping device placed across A/B lines and ground, suppressing common-mode transients up to ±30 kV contact discharge. Use Value: Maintains signal eye diagram integrity by limiting differential overshoot to <1.5 V beyond VCC, preserving 10 Mbps data rate compliance. |
Use Scenario: Secondary-level overvoltage protection on USB Type-C VBUS lines after primary buck converter, guarding against adapter fault conditions. IC Role / Device Role / Timing Role: Standoff-rated (33 V) clamp activated only during >40 V faults - avoids interference with normal 5–20 V PD negotiation. Use Value: Blocks catastrophic overvoltage (>60 V) from reaching USB PD controller ICs while allowing uninterrupted CC logic signaling and power role swapping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-E3/52 | Same electrical specs and SMB package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive stress validation; suitable for consumer or industrial non-automotive designs with lower reliability requirements. | Select when AEC-Q101 is not mandated and cost optimization is prioritized over automotive qualification. |
| SMCJ33CAHE3_A/H | Higher 1500 W peak pulse power rating in larger SMC (DO-214AB) package; otherwise identical VWM, VBR, and VC. | Used where higher surge energy (e.g., 10/1000 µs, 200 A) must be absorbed without clamping voltage rise - requires PCB layout change. | Choose when system-level surge testing exceeds 600 W capability and board space permits SMC footprint. |
Compared with SMBJ33CAHE3_B/H, the SMBJ33CA-E3/52 offers identical protection performance without automotive qualification, while the SMCJ33CAHE3_A/H delivers 2.5× higher surge capacity in a larger package - enabling trade-offs between qualification assurance, footprint constraints, and worst-case energy handling.
Availability
SMBJ33CAHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial 24 V power input stages, and bidirectional communication line safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMBJ33CAHE3_B/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 reliability, precision, and automotive-grade qualification.
The SMBJ series targets high-reliability transient suppression in space-constrained applications, with design focus on low clamping ratio, fast response, and AEC-Q101 compliance for automotive and industrial environments.
FAQ
What does the "CA" suffix indicate in SMBJ33CAHE3_B/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ33CAHE3_B/H provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ33A), it has no cathode marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled or floating signal lines such as RS-485 or CAN bus pairs.
Is SMBJ33CAHE3_B/H compatible with lead-free reflow processes?
Yes, SMBJ33CAHE3_B/H is rated for lead-free reflow with a maximum peak temperature of 260 °C per J-STD-020, meeting MSL Level 1 requirements. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the device undergoes JESD 201 Class 2 whisker testing - ensuring reliable interconnect integrity in high-volume automated assembly.
How does the clamping voltage of SMBJ33CAHE3_B/H compare to its breakdown voltage?
SMBJ33CAHE3_B/H exhibits a clamping ratio of approximately 1.38 (53.3 V / 38.65 V typical VBR), indicating tight voltage control during surge events. This low ratio ensures minimal overvoltage stress on downstream components - for example, limiting excursion to 53.3 V during a 11.3 A 10/1000 µs transient, well below the 60 V absolute maximum rating of many 3.3 V and 5 V interface ICs.
Can SMBJ33CAHE3_B/H replace unidirectional TVS diodes in existing designs?
SMBJ33CAHE3_B/H can replace unidirectional variants only if the circuit topology supports bidirectional clamping - such as across differential lines or between supply and ground in DC systems with no polarity-sensitive components. It must not be substituted in series with DC-biased signal paths where forward conduction would cause malfunction, as its symmetrical structure conducts in both directions above VBR.
What is the significance of the "HE3_B/H" suffix in SMBJ33CAHE3_B/H?
The "HE3" portion indicates RoHS-compliant construction with AEC-Q101 qualification; "B/H" specifies packaging in 7-inch tape-and-reel format with 750 units per reel (H = reel size code). This ordering code ensures traceable sourcing of automotive-grade parts with documented qualification history, supporting PPAP documentation and long-term supply chain visibility for Tier 1 automotive suppliers.
SMBJ33CAHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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):
- 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)
SMBJ33CAHE3_B/H FAQ
1.How can I place an order for SMBJ33CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHE3_B/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 SMBJ33CAHE3_B/H reliable?
The price and inventory of SMBJ33CAHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHE3_B/H?
SMBJ33CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHE3_B/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 SMBJ33CAHE3_B/H?
For technical support, including SMBJ33CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHE3_B/H requirements.
6.How does Aetrix verify that SMBJ33CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHE3_B/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 SMBJ33CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHE3_B/H?
All SMBJ33CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHE3_B/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 SMBJ33CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMBJ33CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHE3_B/H Tags
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