My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ33CA/54
- Part No.:
- SMBJ33CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA/54.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,417
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33CA/54 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 a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, sensor interfaces, and industrial I/O lines against ESD and inductive switching surges.
For engineers reviewing the SMBJ33CA/54 datasheet, SMBJ33CA/54 pinout, SMBJ33CA/54 application, or SMBJ33CA/54 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.4), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on PCBs handling automotive-grade transient immunity per ISO 7637-2.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in either direction. Its glass-passivated junction enables fast response time (<1 ps) and stable leakage performance (ID ≤ 1.0 µA at VWM = 33 V).
The device is rated for 150 °C maximum junction temperature, exhibits +0.100 %/°C temperature coefficient of VBR, and delivers 600 W surge capability under repetitive 0.01 % duty cycle conditions when mounted on 5.0 mm × 5.0 mm copper pads - meeting IEC 61000-4-2 (±15 kV air, ±8 kV contact) and IEC 61000-4-4 (40 A/50 ns) requirements when properly implemented.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before significant leakage; defines upper limit of normal operating range. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold range; ensures reliable conduction onset during overvoltage events. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM | 600 W - Peak pulse power dissipation capability; supports robust protection against lightning-induced surges and load dump transients. |
| ID @ VWM | ≤ 1.0 µA - Reverse leakage current at rated standoff voltage; ensures minimal power loss and signal integrity in standby. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in high-ambient industrial or under-hood automotive environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with JEDEC J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable. Cathode/anode designation does not apply; both ends function identically under reverse or forward bias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as bidirectional surge current entry/exit points; no DC polarity dependency - simplifies layout and eliminates orientation errors. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Supports high-energy surge suppression in industrial motor drives and telecom line cards without derating concerns. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during clamping - critical for safeguarding 3.3 V or 5 V logic interfaces downstream. |
| MSL Level 1, 260 °C peak reflow | Allows standard lead-free SMT assembly without pre-baking or special handling - reduces manufacturing overhead. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage over lifetime and temperature cycling - improves long-term reliability in harsh environments. |
Applications
| Industrial Motor Control I/O Protection | Automotive Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting analog input channels of PLC modules from inductive kickback generated by solenoid or relay switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground to clamp transients before they reach ADC front-end or isolation amplifier. Use Value: Limits voltage excursion to ≤53.3 V during 11.3 A surge, preventing latch-up or damage to 24 V-tolerant input stages while maintaining <1 µA leakage at 33 V nominal. |
Use Scenario: Safeguarding CAN or LIN bus signal pairs in engine control units exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Parallel-connected TVS on differential pair to suppress common-mode transients without affecting signal integrity at 500 kbps+ data rates. Use Value: Symmetrical clamping ensures equal protection on both lines; low capacitance (<100 pF typical) avoids signal rise-time degradation in high-speed sensor links. |
| Telecom Power Feeding Interface | Consumer Appliance Power Supply Input |
|
Use Scenario: Protecting PoE-powered device inputs against surges induced by Ethernet cable coupling or field wiring faults. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC feed line upstream of DC/DC converter, coordinated with upstream fuse and MOV. Use Value: Withstands 600 W pulses without degradation, enabling compliance with IEEE 802.3af/bt surge immunity requirements while supporting continuous 48 V operation. |
Use Scenario: Secondary-side transient suppression on 12 V or 24 V internal supply rails feeding microcontrollers and display drivers in washing machines or HVAC controllers. IC Role / Device Role / Timing Role: Localized clamping device placed near IC power pins to absorb board-level ESD and switching noise from relays or triacs. Use Value: Fast sub-nanosecond response captures fast-rising transients missed by bulk capacitors; SMB footprint allows dense placement adjacent to sensitive loads. |
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 | Same electrical specs and SMB package; RoHS-compliant commercial-grade variant with matte tin leads and J-STD-002 solderability. | No AEC-Q101 qualification; intended for non-automotive industrial or consumer use where automotive reliability certification is not required. | Select SMBJ33CA-E3/52 when cost-sensitive commercial designs prioritize standard compliance over automotive qualification. |
| SMBJ33CAHE3_B/H | Identical electrical parameters and SMB package; adds AEC-Q101 qualification, halogen-free construction, and enhanced traceability for automotive programs. | Approved for under-hood and chassis-mounted applications requiring extended temperature cycling and long-term reliability validation per automotive standards. | Choose SMBJ33CAHE3_B/H when designing for OEM or Tier-1 automotive systems requiring PPAP documentation and AEC-Q101 evidence. |
Compared with SMBJ33CA/54, SMBJ33CA-E3/52 offers identical protection performance at lower cost for non-automotive use, while SMBJ33CAHE3_B/H adds automotive qualification and halogen-free materials - making SMBJ33CA/54 a balanced option for industrial applications needing verified tape-and-reel delivery and standard commercial reliability.
Availability
SMBJ33CA/54 is available at Aetrix Electronics and suitable for industrial motor control I/O protection, automotive sensor interface hardening, and telecom power feeding applications requiring stable component supply, consistent tape-and-reel packaging, and full traceability.
Supply support for SMBJ33CA/54 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 high-power handling.
The SMBJ series was developed for robust, surface-mount transient suppression in space-constrained industrial, automotive, and telecom systems - delivering standardized 600 W surge capability across a wide VWM range in the compact SMB package.
FAQ
What is the clamping voltage of SMBJ33CA/54 at its rated peak pulse current?
The SMBJ33CA/54 has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 11.3 A under a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33CA/54 maintains this clamping performance consistently across its operational temperature range.
Is SMBJ33CA/54 suitable for automotive applications?
The SMBJ33CA/54 itself is not AEC-Q101 qualified; it is a commercial-grade variant. However, Vishay offers the functionally identical SMBJ33CAHE3_B/H, which carries full AEC-Q101 qualification. For automotive designs requiring certified reliability, SMBJ33CAHE3_B/H should be selected instead of SMBJ33CA/54 - the SMBJ33CA/54 remains appropriate for industrial or consumer applications where automotive qualification is not mandated.
What is the standoff voltage rating of SMBJ33CA/54, and how does it relate to system operating voltage?
The SMBJ33CA/54 has a reverse standoff voltage (VWM) of 33 V, meaning it remains in high-impedance state up to this DC or RMS voltage level. To ensure reliable operation, the system's maximum continuous operating voltage must be ≤33 V - typically derated by 10–20 % to accommodate tolerances and transients. This makes SMBJ33CA/54 well-suited for 24 V industrial buses or 28 V avionics subsystems where nominal voltage stays safely below VWM.
Does SMBJ33CA/54 have polarity markings, and how is it installed on PCB?
No - SMBJ33CA/54 is a bidirectional TVS and carries no cathode band or polarity marking. Its terminals are electrically symmetrical, allowing installation in either orientation on the PCB. This eliminates orientation-related assembly errors and simplifies layout for differential or floating signal lines. The SMBJ33CA/54 uses the standard SMB (DO-214AA) footprint with center-to-center terminal spacing of 3.94 mm.
What thermal resistance values apply to SMBJ33CA/54, and how do they affect power handling?
The SMBJ33CA/54 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W when mounted on recommended 5.0 mm × 5.0 mm copper pads. These values determine steady-state power dissipation limits: at 25 °C ambient, its 5.0 W continuous power rating assumes adequate pad copper area. For pulsed operation, thermal mass dominates - enabling 600 W peak handling despite modest RθJA, as confirmed in Figure 2 of the Vishay datasheet for SMBJ33CA/54.
SMBJ33CA/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ33CA/54 FAQ
1.How can I place an order for SMBJ33CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA/54 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 SMBJ33CA/54 reliable?
The price and inventory of SMBJ33CA/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CA/54 is usually 5 days.
3.What payment methods are accepted for SMBJ33CA/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA/54?
SMBJ33CA/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA/54 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 SMBJ33CA/54?
For technical support, including SMBJ33CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA/54 requirements.
6.How does Aetrix verify that SMBJ33CA/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA/54 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 SMBJ33CA/54 meets industry standards.
7.What is the process for return or replacement of SMBJ33CA/54?
All SMBJ33CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA/54, 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 SMBJ33CA/54 part is unused and in its original packaging.
Return procedure for SMBJ33CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA/54 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
