My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ33CA
- Part No.:
- SMBJ33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:48,625
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a 33 V working stand-off voltage (VWM), 36.7–44.9 V breakdown voltage (VBR), 59.0 V maximum clamping voltage (VC) at 10.6 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ33CA datasheet, SMBJ33CA pinout, SMBJ33CA application, or SMBJ33CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 compliance for automotive transients, low leakage (<1 µA at 33 V), UL 94V-0 molded case, and suitability for inductive load switching and lighting system protection.
Technical Context
The SMBJ33CA operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ) up to 33 V; during transients exceeding VBR (min 36.7 V), it avalanches rapidly to clamp voltage at ≤59.0 V. Its glass-passivated junction ensures stable breakdown and low leakage across -55°C to +150°C junction temperature range.
Designed for unidirectional or bidirectional use (C/CA suffix denotes bidirectional), SMBJ33CA supports both 10/1000 µs surge waveforms and electrical fast transients (EFT). Thermal resistance is 10°C/W junction-to-case and 55°C/W junction-to-ambient, enabling reliable operation at 3 W steady-state dissipation with proper PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR (min/max) | 36.7 V / 44.9 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold |
| VC @ IPP | 59.0 V at 10.6 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs event; derates above 25°C ambient |
| ID @ VWM | <1 µA - Leakage current at rated stand-off voltage; ensures minimal standby power loss |
| Package | DO-214AA (SMB) - Surface-mount outline with cathode band marking; 0.090 g mass, J-STD-020 Level 1 moisture sensitivity |
| TJ max | +150°C - Maximum junction temperature; enables use in under-hood automotive or industrial environments |
Pinout & Package
DO-214AA (SMB) package: surface-mount, two-terminal device with cathode band marking on one end. Terminals are non-polarized for bidirectional operation; polarity marking indicates cathode for unidirectional variants only - not applicable to SMBJ33CA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output; clamping occurs identically in both directions |
| Cathode band (not functional) | Manufacturing mark only | No polarity dependence; band present for legacy compatibility but electrically irrelevant for CA variant |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses, or floating references without polarity concerns |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) - critical for automotive ECUs |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; reduces parameter drift vs. epoxy-passivated alternatives |
| Fast response <1.0 ps | Clamps before most ICs experience latch-up or gate oxide damage; protects sub-10 ns sensitive nodes |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export-compliant designs |
Applications
| Automotive Power Rail Protection | LED Driver Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V/24 V supply inputs in body control modules (BCM), infotainment head units, and ADAS sensors from load-dump and jump-start surges. IC Role / Device Role / Timing Role: Shunt TVS placed upstream of DC-DC converters and LDOs to clamp transients before regulation stage. Use Value: Limits voltage to ≤59.0 V during ISO 7637-2 Pulse 1 (−120 V/0.5 Ω), preventing regulator overvoltage failure and ensuring system-level EMC compliance. |
Use Scenario: Safeguarding constant-current LED drivers in streetlights and automotive lighting from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Bidirectional clamping across driver output terminals to absorb reverse EMF from LED string inductance. Use Value: Prevents driver IC destruction during rapid current interruption; SMBJ33CA's 600 W rating handles repetitive 10/1000 µs surges common in high-power LED systems. |
| Industrial PLC I/O Protection | USB/RS-485 Port ESD Hardening |
Use Scenario: Shielding digital input channels on programmable logic controllers from field-wiring induced transients and lightning-induced coupling. IC Role / Device Role / Timing Role: Primary front-end protection on 24 V dry-contact or sensor-input lines, placed before optocoupler or Schmitt trigger input. Use Value: Withstands repeated 1 kV/42 Ω surge (IEC 61000-4-5) due to low clamping voltage and robust 150°C junction rating - extends field reliability in factory environments. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines or RS-485 differential pairs in industrial gateways and edge devices. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS across D+/D− or A/B lines to suppress ESD (±15 kV contact) without distorting signal integrity. Use Value: Junction capacitance <100 pF (per Fig.5 at VR=0) minimizes signal rise-time degradation; SMBJ33CA's fast response prevents ESD-induced data corruption in real-time comms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33CA | Same DO-214AC (SMA) package; 500 W PPK rating; VC = 53.3 V @ 11.3 A; slightly lower clamping but smaller footprint | Lower power handling limits use in high-energy automotive load-dump scenarios; better suited for space-constrained consumer ports | Select SMAJ33CA when board area is constrained and peak surge energy is ≤500 W; verify thermal margin with RθJA = 65°C/W |
| ON Semiconductor SMCJ33CA | DO-214AB (SMC) package; 1500 W PPK; VC = 53.3 V @ 28.3 A; higher surge capacity and same clamping performance | Required for ISO 7637-2 Pulse 5a (load dump) in 24 V systems; larger footprint and higher cost than SMBJ33CA | Choose SMCJ33CA for full automotive load-dump compliance where 1500 W surge immunity is mandated; SMBJ33CA suffices for Pulse 1–3 only |
Compared with SMAJ33CA and SMCJ33CA, SMBJ33CA delivers optimal balance of 600 W surge rating, DO-214AA footprint, and ISO 7637-2 Pulse 1–3 compliance - making it ideal for cost-sensitive, medium-energy industrial and commercial applications where SMC size is excessive and SMA power insufficient.
Availability
SMBJ33CA is available at Aetrix Electronics and suitable for automotive electronics, LED lighting systems, and industrial PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ33CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was developed for high-reliability surface-mount surge protection in automotive, industrial, and lighting applications - emphasizing robust clamping, AEC-Q200 readiness, and consistent parametric stability across temperature.
FAQ
What is the clamping voltage of SMBJ33CA and how does it protect downstream circuitry?
The SMBJ33CA has a maximum clamping voltage (VC) of 59.0 V at 10.6 A peak pulse current (10/1000 µs waveform). This means that during a transient event, the device limits the voltage seen by downstream components to no more than 59.0 V - well below typical IC absolute maximum ratings (e.g., 60–70 V for many 36 V-rated regulators). Its sub-1 ps response ensures clamping initiates before sensitive nodes experience overvoltage stress, preserving system reliability in harsh electrical environments.
Is SMBJ33CA unidirectional or bidirectional, and how is polarity indicated?
SMBJ33CA is a bidirectional TVS diode - it provides symmetrical clamping in both forward and reverse directions, with identical VBR (36.7–44.9 V) and VC characteristics regardless of voltage polarity. Unlike unidirectional variants (e.g., SMBJ33A), the "CA" suffix confirms bidirectional functionality. The cathode band marking on the DO-214AA package is retained for manufacturing consistency but has no electrical significance for SMBJ33CA.
Does SMBJ33CA meet automotive transient standards such as ISO 7637-2?
Yes, SMBJ33CA is explicitly rated to meet ISO 7637-2 for Pulses 1 (inductive load dump), 2a/2b (switching transients), and 3a/3b (electrical fast transients). Its 600 W peak pulse power, 59.0 V clamping voltage, and fast response time ensure compliance in 12 V and 24 V vehicle networks. Note that Pulse 5a (load dump) requires higher energy handling (e.g., SMCJ33CA); SMBJ33CA covers all other pulses defined in the standard.
What is the maximum junction temperature and thermal resistance of SMBJ33CA?
SMBJ33CA has a maximum junction temperature (TJ) of +150°C and thermal resistances of RθJC = 10°C/W (junction-to-case) and RθJA = 55°C/W (junction-to-ambient). These values assume standard JEDEC 2-layer PCB mounting with 1 in² copper pad. At 25°C ambient, the device can safely dissipate 3 W continuously; derating curves (Fig.2) apply above 25°C to maintain TJ ≤150°C under sustained power conditions.
How does SMBJ33CA compare to SMBJ33A in terms of electrical performance and application use?
SMBJ33CA is bidirectional with symmetrical clamping; SMBJ33A is unidirectional and conducts only in reverse bias. SMBJ33CA has identical VWM (33 V), VBR (36.7–44.9 V), and VC (59.0 V) specs but allows placement on AC-coupled or floating lines without polarity concern. SMBJ33A offers slightly lower VF (3.5 V) in forward conduction - irrelevant for SMBJ33CA. Use SMBJ33CA for differential buses, transformer-coupled interfaces, or any application requiring polarity-agnostic protection.
SMBJ33CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- 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 (SMB)
SMBJ33CA FAQ
1.How can I place an order for SMBJ33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA 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 reliable?
The price and inventory of SMBJ33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CA is usually 5 days.
3.What payment methods are accepted for SMBJ33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA?
SMBJ33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA 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?
For technical support, including SMBJ33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA requirements.
6.How does Aetrix verify that SMBJ33CA is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA 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 meets industry standards.
7.What is the process for return or replacement of SMBJ33CA?
All SMBJ33CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA, 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 part is unused and in its original packaging.
Return procedure for SMBJ33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
