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Vishay General Semiconductor - Diodes Division SMB8J33CAHE3_A/I
- Part No.:
- SMB8J33CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CAHE3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J33CAHE3_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 SMB8J33CAHE3_A/I datasheet, SMB8J33CAHE3_A/I pinout, SMB8J33CAHE3_A/I application, or SMB8J33CAHE3_A/I equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping symmetry, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
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 across -55 °C to +150 °C operating range, with bidirectional symmetry enabling protection of AC-coupled or differential signal paths without polarity constraints.
The device meets AEC-Q101 stress test requirements for automotive use and is rated for MSL Level 1 per J-STD-020 (260 °C peak reflow). Its 72 °C/W junction-to-ambient thermal resistance reflects standard SMB package limitations, while 20 °C/W junction-to-lead resistance supports effective heat dissipation into PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin in protected circuit. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed breakdown onset range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 53.3 V at 15 A (10/1000 μs) - clamping voltage under standardized surge; determines maximum voltage seen by downstream ICs during fault. |
| PPPM | 800 W - peak transient energy handling capacity; enables robust protection against ISO 7637-2 Pulse 1/2a/5a in automotive environments. |
| ID @ VWM | 1.0 μA - reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance nodes. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial control cabinet applications. |
| RθJL | 20 °C/W - junction-to-lead thermal resistance; enables efficient heat transfer to PCB traces and thermal pads during repetitive surges. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Case dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional structure allows identical clamping in both directions; no cathode band marking required. |
| Case (cathode side in unidirectional variants) | Thermal and mechanical interface | Exposed metal slug provides primary thermal path to PCB; requires minimum 5.0 mm × 5.0 mm copper pad per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TCT, and ESD testing - suitable for engine control, ADAS sensor, and body electronics. |
| Glass passivated junction | Stable VBR over lifetime and temperature; eliminates risk of moisture-induced parameter drift in humid or condensing environments. |
| Low incremental surge resistance | Enables tighter VC vs. IPPM relationship - reduces overshoot during fast-rising transients like EFT (IEC 61000-4-4). |
| MSL Level 1 rating | Compatible with standard lead-free reflow profiles up to 260 °C peak; no dry-pack or baking required prior to assembly. |
| Halogen-free RoHS-compliant (HM3 suffix) | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) without compromising surge performance. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and ground (or rail), activated only during overvoltage events >33 V. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to MCU ADC inputs or transceiver PHYs while maintaining signal integrity below VWM. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring exposed to relay coil flyback and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across input terminals, absorbing energy from both positive and negative polarity transients. Use Value: Withstands 800 W pulses without degradation, enabling compliance with IEC 61000-4-5 Level 3 (2 kV/12 Ω) without additional series impedance. |
| USB Port ESD Protection | Power Supply Rail Clamp |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in automotive infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) bidirectional clamp placed after primary TVS or ESD array to handle residual surges. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) to <55 V within nanoseconds, preserving signal rise time and eye diagram integrity. |
Use Scenario: Overvoltage clamp on 3.3 V or 5 V microcontroller supply rails subjected to back-EMF from nearby motor drivers. IC Role / Device Role / Timing Role: Fast-acting shunt device that diverts surge current away from LDO or PMIC when rail exceeds 33 V. Use Value: Prevents latch-up or gate oxide rupture in downstream ICs by limiting rail excursion to 53.3 V for durations up to 1 ms. |
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-E3/52 | Unqualified commercial grade; same VWM/VC/IPPM specs but lacks AEC-Q101 validation and MSL Level 1 reflow rating. | Restricted to non-automotive industrial or consumer applications where qualification and long-term reliability under thermal cycling are not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and reflow profile is controlled. |
| SMCJ33CAHE3_A/I | Same AEC-Q101 qualification and electrical specs, but in larger SMC (DO-214AB) package with higher PPPM (1500 W) and lower RθJA (40 °C/W). | Preferred for higher-energy threats (e.g., ISO 7637-2 Pulse 5b) or thermally constrained layouts requiring better power dissipation. | Choose when surge energy exceeds 800 W or board space allows larger footprint and thermal management is critical. |
Compared with SMBJ33CA-E3/52, SMB8J33CAHE3_A/I adds automotive qualification and reflow robustness without sacrificing electrical performance; versus SMCJ33CAHE3_A/I, it trades 700 W extra surge capacity for 40% smaller PCB area and compatible placement with SMB-class footprints.
Availability
SMB8J33CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and USB port ESD mitigation requiring stable component supply across multi-year production cycles.
Supply support for SMB8J33CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in space-constrained automotive and industrial systems.
FAQ
What is the clamping voltage of SMB8J33CAHE3_A/I at its rated peak pulse current?
The SMB8J33CAHE3_A/I has a maximum clamping voltage (VC) of 53.3 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 15 A. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMB8J33CAHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMB8J33CAHE3_A/I suitable for automotive applications?
Yes, SMB8J33CAHE3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including engine control units, ADAS sensors, and body electronics. Its MSL Level 1 rating supports standard lead-free reflow, and its -55 °C to +150 °C operating range meets under-hood thermal requirements. The SMB8J33CAHE3_A/I is explicitly designated for automotive use in Vishay's ordering nomenclature.
How does the bidirectional configuration of SMB8J33CAHE3_A/I affect its circuit implementation?
The SMB8J33CAHE3_A/I is bidirectional, meaning it clamps symmetrically for both positive- and negative-polarity transients without requiring orientation during placement. This eliminates the need for polarity marking on PCB silkscreen and simplifies layout for AC-coupled signals, differential buses (e.g., RS-485), or dual-rail protection. Unlike unidirectional TVS diodes, the SMB8J33CAHE3_A/I has no cathode band and functions identically regardless of terminal connection direction.
What is the thermal resistance specification for SMB8J33CAHE3_A/I, and why does it matter?
SMB8J33CAHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W. RθJL is critical because it governs how efficiently heat generated during surge events transfers from the silicon die to the PCB copper via the leads - directly impacting reliability under repetitive transients. The SMB8J33CAHE3_A/I requires minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve these ratings, as specified in Vishay's thermal derating curves.
Can SMB8J33CAHE3_A/I replace SMBJ33CA in an existing design?
SMB8J33CAHE3_A/I shares identical electrical specifications (VWM = 33 V, VC = 53.3 V, PPPM = 800 W) and SMB (DO-214AA) package dimensions with SMBJ33CA, but adds AEC-Q101 qualification, MSL Level 1 reflow rating, and halogen-free construction. Mechanical drop-in replacement is possible if the PCB pad layout matches Vishay's recommended 5.0 mm × 5.0 mm copper areas. However, SMB8J33CAHE3_A/I should be selected specifically when automotive qualification or enhanced process reliability is required - the SMB8J33CAHE3_A/I is not a generic substitute for all SMBJ33CA use cases.
SMB8J33CAHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J33CAHE3_A/I FAQ
1.How can I place an order for SMB8J33CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CAHE3_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 SMB8J33CAHE3_A/I reliable?
The price and inventory of SMB8J33CAHE3_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 SMB8J33CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J33CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CAHE3_A/I?
SMB8J33CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CAHE3_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 SMB8J33CAHE3_A/I?
For technical support, including SMB8J33CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J33CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J33CAHE3_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 SMB8J33CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J33CAHE3_A/I?
All SMB8J33CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CAHE3_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 SMB8J33CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMB8J33CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CAHE3_A/I Tags
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