My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ33CH
- Part No.:
- SMBJ33CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CH.pdf
- Description:
- 600W, 40.8V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,368
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ33CH 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), 36.7–44.9 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 sub-1 ps response time.
For engineers reviewing the SMBJ33CH datasheet, SMBJ33CH pinout, SMBJ33CH application, or SMBJ33CH equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, low leakage (<1 µA at 33 V), and DO-214AA mechanical compatibility in space-constrained PCB layouts.
Technical Context
The SMBJ33CH is a unidirectional/bidirectional TVS diode optimized for fast transient suppression on DC power lines and signal interfaces. Its glass-passivated junction ensures stable VBR and low leakage, while its 10 °C/W junction-to-case thermal resistance supports sustained surge handling under intermittent fault conditions.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing and ISO 7637-2 immunity requirements for load dump and inductive switching transients. The device operates across –55 °C to +150 °C junction temperature range and exhibits <1 µA blocking leakage above 10 V, enabling low-power system compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 36.7 V / 44.9 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| 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 per 10/1000 µs waveform, critical for load-dump immunity |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint with 0.090 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional variant uses symmetric marking; no anode/cathode distinction). Weight: 0.090 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode band side) | Transient return path | Provides low-impedance path to ground or rail during bidirectional clamping events |
| Cathode (cathode band side) | Transient return path | Identical role to anode in bidirectional configuration; terminals are functionally interchangeable |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (ignition noise) |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in harsh environments |
| Sub-1 ps response time | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to clamp surges up to ±100 V. Use Value: Limits voltage seen by MCU, CAN transceivers, and voltage regulators to ≤59.0 V during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding 4–20 mA current-loop sensors from EFT and lightning-induced coupling. IC Role / Device Role / Timing Role: Placed across sensor input terminals to shunt fast transients before front-end op-amps. Use Value: Prevents latch-up or parametric shift in precision amplifiers by clamping spikes within 1 ps. |
| LED Lighting Driver Protection | USB-C Port ESD Hardening |
Use Scenario: Safeguarding constant-current LED drivers against inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: Connected across driver output to absorb energy from coil de-energization. Use Value: Absorbs 600 W peak pulses without degradation, preserving driver MOSFET reliability over 100k cycles. | Use Scenario: Adding secondary-level ESD protection on USB-C VBUS and CC lines in portable devices. IC Role / Device Role / Timing Role: Bidirectional clamping element placed after primary TVS to handle differential-mode surges. Use Value: Delivers <1 µA leakage at 33 V, avoiding interference with USB-C PD negotiation voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33CA | Same DO-214AC (SMA) package; 36.7–44.9 V VBR, 59.0 V VC @ 10.6 A, but rated for 400 W PPK | Lower peak power handling limits use in high-energy load dump scenarios | Select when board space allows SMA footprint and 400 W suffices for IEC 61000-4-5 Level 3 compliance |
| ON Semiconductor 1.5SMC33CA | DO-214AB (SMC) package; identical VWM/VBR/VC specs, 600 W rating, but 1.5× larger footprint and 0.33 g mass | Requires PCB layout revision due to larger pad dimensions and higher thermal mass | Choose when higher thermal inertia is needed for repetitive surge duty cycles in industrial motor drives |
Compared with SMAJ33CA and 1.5SMC33CA, SMBJ33CH delivers identical electrical protection performance in a smaller DO-214AA (SMB) footprint, enabling denser layouts in automotive modules and portable equipment where volume and weight are constrained.
Availability
SMBJ33CH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, LED lighting controllers, and USB-C power delivery designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ33CH 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 with global distribution and AEC-Q101 certification capability.
The SMBJH series was developed specifically for automotive and industrial transient suppression, emphasizing robustness under ISO 7637-2 pulses, low leakage, and surface-mount scalability across 5–170 V VWM ratings.
FAQ
What does the 'CH' suffix indicate in SMBJ33CH?
The 'CH' suffix in SMBJ33CH denotes a bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SMBJ33H), SMBJ33CH has no designated anode or cathode and functions identically regardless of voltage polarity applied across its terminals. This makes SMBJ33CH ideal for AC-coupled lines or differential bus protection where polarity reversal may occur.
Is SMBJ33CH compliant with AEC-Q101 and ISO 7637-2?
Yes, SMBJ33CH is explicitly qualified to AEC-Q101 for automotive applications and meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms. These certifications are documented in Taiwan Semiconductor's official SMBJH series datasheet (Version A2102), confirming its suitability for engine control units, body control modules, and other under-hood electronics subject to rigorous environmental stress testing.
What is the maximum clamping voltage of SMBJ33CH and how is it measured?
The maximum clamping voltage of SMBJ33CH is 59.0 V, measured at 10.6 A peak pulse current using the standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage that will appear across the device during a worst-case transient event, directly limiting the stress imposed on downstream components such as microcontrollers or communication transceivers protected by SMBJ33CH.
Can SMBJ33CH be used in place of unidirectional SMBJ33H in existing designs?
No - SMBJ33CH is bidirectional and lacks polarity marking, whereas SMBJ33H is unidirectional with a defined cathode band. Substituting SMBJ33CH for SMBJ33H requires verifying that the circuit does not rely on DC blocking or forward conduction behavior. In purely clamping applications (e.g., across power rails), SMBJ33CH may be used, but reverse-biased leakage and forward voltage characteristics differ and must be validated per design.
What is the thermal resistance profile of SMBJ33CH and why does it matter?
SMBJ33CH has a junction-to-case thermal resistance (RθJC) of 10 °C/W and junction-to-ambient resistance (RθJA) of 55 °C/W. These values determine how effectively heat from surge energy is dissipated during transient events. Lower RθJC enables faster heat transfer to the PCB copper, improving reliability during repeated surges; RθJA informs board-level thermal design, especially in sealed enclosures where ambient cooling is limited.
SMBJ33CH 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:
- 59V
- Current - Peak Pulse (10/1000µs):
- 10.6A
- 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)
SMBJ33CH FAQ
1.How can I place an order for SMBJ33CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CH 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 SMBJ33CH reliable?
The price and inventory of SMBJ33CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CH is usually 5 days.
3.What payment methods are accepted for SMBJ33CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CH?
SMBJ33CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CH 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 SMBJ33CH?
For technical support, including SMBJ33CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CH requirements.
6.How does Aetrix verify that SMBJ33CH is sourced from the original manufacturer or authorized distributors?
All SMBJ33CH 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 SMBJ33CH meets industry standards.
7.What is the process for return or replacement of SMBJ33CH?
All SMBJ33CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CH, 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 SMBJ33CH part is unused and in its original packaging.
Return procedure for SMBJ33CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CH 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…
