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Taiwan Semiconductor Corporation SMCJ33AH
- Part No.:
- SMCJ33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33AH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,317
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Product details
Overview
SMCJ33AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 33V working stand-off voltage, 36.7–40.6V breakdown voltage at 1mA, and 53.3V maximum clamping voltage at 29A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ33AH datasheet, SMCJ33AH pinout, SMCJ33AH application, or SMCJ33AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance values, moisture sensitivity level (MSL 1), and precise clamping behavior under standardized 10/1000μs surge conditions.
Technical Context
The SMCJ33AH uses a glass-passivated silicon junction to achieve sub-1ps response time from 0V to VBR(min), enabling effective suppression of fast ESD and load-switching transients. Its unidirectional configuration provides forward conduction only during reverse overvoltage events, with VF = 3.5V at 100A for devices ≤90V - confirmed for SMCJ33AH per datasheet Note 2.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting reliable operation up to TJ = +150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 36.7–40.6 V - Confirmed breakdown range ensures predictable turn-on margin above VWM |
| VC @ IPPM=29A | 53.3 V - Clamping voltage limits downstream IC stress during 10/1000μs surges |
| PPK | 1500 W - Peak pulse power rating per single 1ms non-repetitive surge per Fig.5 |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ max | +150 °C - Junction temperature limit enables use in under-hood automotive environments |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or low-side return in unidirectional TVS configurations |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 33V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, AC, and ESD |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation |
| Sub-1ps response time | Ensures clamping activation before transient energy couples into sensitive analog or digital circuitry |
| MSL Level 1 | Zero floor-life limitation - can be mounted directly after tape-and-reel unpacking without baking |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 33V auxiliary power rails in vehicle body control modules against load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33V supply and chassis ground to clamp ISO 7637-2 Pulse 1 (−100V, 400ms). Use Value: Limits voltage seen by downstream DC-DC converters to ≤53.3V, preventing latch-up or permanent damage. | Use Scenario: Safeguarding 24–36V digital input channels on programmable logic controllers exposed to field-wiring inductive kickback. IC Role / Device Role / Timing Role: Standoff protection element on each channel, activated only during >33V transients per IEC 61000-4-5 Level 4. Use Value: Maintains signal integrity below 33V while clamping 1kV/0.5Ω surges to safe levels within 1ps. |
| Telecom DC Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: Shielding PoE-powered remote radios operating from 33V midspan injectors against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on DC input stage, coordinated with upstream GDT and downstream π-filter. Use Value: Absorbs 1500W peak energy without failure, preserving uptime in harsh outdoor deployments. | Use Scenario: Protecting MOSFET gate drivers and microcontroller I/O in solar charge controllers subjected to battery terminal reversal and load dump. IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMCJ33AH used as unidirectional clamp on positive rail only. Use Value: Enables robust 33V rail operation across −40°C to +125°C ambient with no derating required below 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | 600W rating, SMB package (smaller footprint, higher RθJA = 75°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 | Select when board space is constrained and peak surge energy remains ≤600W |
| SMCJ33A | Same 1500W rating but non-AEC-Q101; lacks automotive qualification documentation | Acceptable for industrial/commercial use where AEC-Q101 is not mandated | Choose for cost-sensitive non-automotive designs requiring identical clamping performance |
Compared with SMBJ33A and SMCJ33A, the SMCJ33AH provides AEC-Q101 validation, guaranteed MSL Level 1 handling, and documented ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity - making it the only option qualified for safety-critical automotive subsystems requiring zero field returns under transient stress.
Availability
SMCJ33AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom DC power feeds, and renewable energy charge controllers requiring stable component supply across extended production lifecycles.
Supply support for SMCJ33AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMCJ series belongs to TSC's AEC-Q101-qualified TVS portfolio designed specifically for robust transient immunity in automotive power networks and industrial control systems where reliability under ISO 7637-2 and IEC 61000-4-5 stress is mandatory.
FAQ
What is the clamping voltage of SMCJ33AH at its rated peak pulse current?
The SMCJ33AH has a maximum clamping voltage (VC) of 53.3 V at 29 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per Fig.5 in the datasheet and defines the upper voltage limit imposed on protected circuitry during surge events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings when SMCJ33AH activates.
Is SMCJ33AH suitable for bidirectional transient protection?
No, SMCJ33AH is a unidirectional TVS diode intended for protection of positive DC rails only. For bidirectional applications, Taiwan Semiconductor specifies part numbers with CH or CAH suffixes (e.g., SMCJ33CH). Using SMCJ33AH in reverse-biased configurations outside its specified unidirectional operation risks premature failure or undefined clamping behavior.
Does SMCJ33AH meet automotive qualification standards?
Yes, SMCJ33AH is explicitly AEC-Q101 qualified per the provided datasheet (Version A2102), covering stress tests including high-temperature operating life, temperature cycling, autoclave, and ESD. This qualification confirms suitability for automotive powertrain, body electronics, and infotainment systems where component reliability under thermal and electrical stress is critical.
What is the thermal resistance from junction to ambient for SMCJ33AH?
The junction-to-ambient thermal resistance (RθJA) of SMCJ33AH is 55°C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value assumes typical PCB layout with minimal copper area; actual thermal performance improves with enhanced heatsinking. RθJA directly determines allowable power dissipation at elevated ambient temperatures using the derating curve in Fig.2.
How does SMCJ33AH differ from SMCJ33A?
SMCJ33AH and SMCJ33A share identical electrical specifications (VWM, VBR, VC, PPK) and DO-214AB packaging, but only SMCJ33AH carries full AEC-Q101 qualification and associated test documentation. SMCJ33A is intended for industrial/commercial use and lacks the automotive stress validation required for Tier 1 automotive BOMs.
SMCJ33AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 29A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ33AH FAQ
1.How can I place an order for SMCJ33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33AH 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 SMCJ33AH reliable?
The price and inventory of SMCJ33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33AH is usually 5 days.
3.What payment methods are accepted for SMCJ33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33AH?
SMCJ33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33AH 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 SMCJ33AH?
For technical support, including SMCJ33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33AH requirements.
6.How does Aetrix verify that SMCJ33AH is sourced from the original manufacturer or authorized distributors?
All SMCJ33AH 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 SMCJ33AH meets industry standards.
7.What is the process for return or replacement of SMCJ33AH?
All SMCJ33AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33AH, 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 SMCJ33AH part is unused and in its original packaging.
Return procedure for SMCJ33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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