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Taiwan Semiconductor Corporation SMBJ33CAH
- Part No.:
- SMBJ33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,129
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Product details
Overview
SMBJ33CAH 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 automotive and industrial power rails. It features a 33 V working stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 59.0 V maximum clamping voltage (VC) at 10.6 A peak pulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ33CAH datasheet, SMBJ33CAH pinout, SMBJ33CAH application, or SMBJ33CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA at 33 V), and thermal resistance (RθJA = 55 °C/W) for board-level surge immunity design.
Technical Context
The SMBJ33CAH is a unidie, bidirectional TVS diode optimized for fast transient suppression on DC power lines and signal interfaces subject to load dump, inductive switching, and EFT events. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its DO-214AA package supports automated placement and meets JESD201 Class 2 whisker resistance.
It operates across –55 °C to +150 °C junction temperature range and delivers consistent clamping performance under 10/1000 µs surge waveforms per ANSI/IEEE C62.35. Thermal derating follows a defined curve above 25 °C ambient, with RθJC = 10 °C/W enabling effective heat transfer to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 36.7 V / 40.6 V @ 1 mA - Confirmed breakdown threshold ensuring reliable turn-on margin above VWM |
| VC @ IPP | 59.0 V @ 10.6 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak pulse power handling capacity for short-duration transients |
| IR @ VWM | <1 µA - Negligible leakage current preserving system efficiency and battery life |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| RθJA | 55 °C/W - Predictable thermal rise under steady-state power dissipation (PD = 3 W) |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; dual-terminal configuration (anode/cathode) supporting bidirectional clamping without polarity dependency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during negative transients relative to cathode |
| Cathode | Transient return path (bidirectional) | Marked terminal; conducts during positive transients relative to anode; symmetric clamping behavior |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control, body modules, and ADAS power supplies |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) without degradation |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, with <1 µA leakage at rated VWM |
| Sub-1 ps response time | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of LDOs and microcontrollers to limit voltage excursions. Use Value: Limits clamped voltage to 59.0 V during 10/1000 µs surges, preventing latch-up or gate oxide rupture in downstream silicon. | Use Scenario: Digital input channels on programmable logic controllers subjected to field-wiring EFT and inductive kickback. IC Role / Device Role / Timing Role: Primary surge shunt at connector interface, absorbing >600 W transient energy before signal conditioning circuitry. Use Value: Sub-1 ps response ensures clamping initiates before 50 ns EFT pulses propagate into optocoupler or isolator inputs. |
| LED Driver Overvoltage Protection | USB-C Port ESD Suppression |
Use Scenario: Constant-current LED drivers in streetlight or automotive lighting systems experiencing inductive switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp flyback spikes from solenoid or relay loads. Use Value: 33 V VWM aligns with typical 24–36 V LED string operating range, avoiding false triggering during normal operation. | Use Scenario: USB-C receptacle VBUS line in portable docking stations exposed to human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode choke, providing low-clamp backup to primary TVS array. Use Value: 59.0 V VC ensures safe voltage window for USB PD 3.0 20 V operation while maintaining <1 µA standby leakage. |
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 | Same VWM/VBR/VC specs but not AEC-Q101 qualified; RθJA = 60 °C/W vs. 55 °C/W | Limited to commercial/industrial use; not validated for automotive temperature cycling or vibration | Select SMBJ33CAH for automotive OEM designs requiring AEC-Q101; SMBJ33CA suffices for non-automotive cost-sensitive applications |
| SMCJ33CA | Same VWM/VBR but higher PPK = 1500 W; larger DO-214AB (SMC) package; RθJA = 35 °C/W | Supports higher surge currents (IPP = 26.5 A) but requires larger PCB footprint and different pad layout | Choose SMBJ33CAH when space-constrained SMB footprint is mandatory; SMCJ33CA where higher surge margin justifies SMC size |
Compared with SMBJ33CA and SMCJ33CA, the SMBJ33CAH uniquely balances AEC-Q101 qualification, DO-214AA footprint compatibility, and 600 W surge capability-making it optimal for space-limited automotive modules needing certified reliability without layout redesign.
Availability
SMBJ33CAH is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor node protection, and LED lighting surge mitigation requiring stable component supply across multi-year production cycles.
Supply support for SMBJ33CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJH series was developed to deliver AEC-Q101-qualified, high-reliability TVS protection in compact SMB packages for next-generation automotive ECUs and ruggedized industrial controls.
FAQ
What does the "CAH" suffix indicate in SMBJ33CAH?
The "CAH" suffix denotes a bidirectional TVS diode (C = bidirectional), AEC-Q101 qualified (A), and halogen-free construction (H). Unlike unidirectional variants (e.g., SMBJ33AH), SMBJ33CAH provides symmetrical clamping for both positive and negative transients without polarity sensitivity-critical for AC-coupled or floating-rail applications.
Does SMBJ33CAH meet ISO 7637-2 Pulse 1 requirements?
Yes, SMBJ33CAH is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (electrical fast transients). Its 600 W peak pulse power and 59.0 V clamping voltage ensure compliance when mounted with adequate PCB copper area for thermal dissipation.
What is the maximum junction temperature rating for SMBJ33CAH?
The SMBJ33CAH has a maximum junction temperature (TJ) of +150 °C, verified per AEC-Q101 stress testing. This enables reliable operation in under-hood automotive environments and sealed industrial enclosures where ambient temperatures exceed 105 °C, provided thermal design accounts for RθJA = 55 °C/W.
How does SMBJ33CAH differ from SMBJ33AH?
SMBJ33AH is unidirectional with cathode-defined polarity and forward voltage drop (~3.5 V), while SMBJ33CAH is bidirectional with no polarity marking and symmetrical clamping. SMBJ33CAH also carries AEC-Q101 qualification and halogen-free certification-features absent in standard SMBJ33AH-making it suitable for automotive safety-critical subsystems.
Is SMBJ33CAH compatible with lead-free reflow soldering processes?
Yes, SMBJ33CAH uses matte tin-plated leads compliant with J-STD-002 solderability standards and supports lead-free reflow profiles up to 260 °C peak temperature. Its moisture sensitivity level (MSL) is Level 1 per J-STD-020, eliminating bake requirements prior to assembly.
SMBJ33CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 11.8A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ33CAH FAQ
1.How can I place an order for SMBJ33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAH 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 SMBJ33CAH reliable?
The price and inventory of SMBJ33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAH is usually 5 days.
3.What payment methods are accepted for SMBJ33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAH?
SMBJ33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAH 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 SMBJ33CAH?
For technical support, including SMBJ33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAH requirements.
6.How does Aetrix verify that SMBJ33CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAH 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 SMBJ33CAH meets industry standards.
7.What is the process for return or replacement of SMBJ33CAH?
All SMBJ33CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAH, 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 SMBJ33CAH part is unused and in its original packaging.
Return procedure for SMBJ33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAH Tags
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