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Taiwan Semiconductor Corporation SMBJ33AH
- Part No.:
- SMBJ33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33AH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,286
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Product details
Overview
SMBJ33AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 33V working stand-off voltage (VWM), and 53.3V maximum clamping voltage (VC) at 11.8A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ33AH datasheet, SMBJ33AH pinout, SMBJ33AH application, or SMBJ33AH equivalent, key selection criteria include clamping performance under 10/1000µs surge, AEC-Q101 qualification status, unidirectional polarity marking, and thermal resistance (RθJA = 55°C/W) for board-level thermal design.
Technical Context
The SMBJ33AH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1ps response time and <1µA blocking leakage above 10V. Its breakdown voltage range is 36.7–40.6V at 1mA test current, ensuring robust overvoltage threshold stability across temperature and process variation.
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 uses a single-die configuration in DO-214AA package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR min/max | 36.7 V / 40.6 V @ 1 mA - Confirmed avalanche onset range; ensures consistent turn-on across production lots. |
| VC @ IPP | 53.3 V @ 11.8 A (10/1000 µs) - Clamped voltage during worst-case surge; determines protected circuit's voltage stress ceiling. |
| PPK | 600 W - Peak non-repetitive pulse power handling; supports high-energy transients without failure. |
| ID @ VWM | <1 µA - Ultra-low leakage at rated stand-off; avoids parasitic current drain in battery-powered systems. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; enables thermal modeling for PCB copper area and airflow requirements. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-band marked, single unidirectional die. Dimensions per JEDEC DO-214AA standard; recommended pad layout provided in datasheet Figure 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes clamping path during positive transients on cathode side. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24V rail); conducts avalanche current to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, HTRB, and mechanical shock per AEC standard. |
| Glass-passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; critical for humid environments. |
| Clamping ratio VC/VBR | 1.32 (53.3V / 40.6V max) - Low ratio indicates efficient energy diversion with minimal overvoltage overshoot. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 24V battery-supplied ECUs exposed to load-dump transients up to 35V and ISO 7637-2 Pulse 1 (−150V, 50ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp negative-going surges and limit voltage excursion to ≤53.3V. Use Value: Prevents damage to downstream PMICs, CAN transceivers, and microcontrollers by limiting peak rail voltage within their absolute maximum rating. |
Use Scenario: 24V DC input terminals of programmable logic controllers subjected to inductive switching noise from solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff protection device absorbing repetitive 10/1000µs transients up to 600W without degradation. Use Value: Maintains signal integrity and prevents false triggering of digital inputs by suppressing fast-rising EFT bursts (IEC 61000-4-4). |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Protection |
Use Scenario: Constant-current LED drivers in commercial lighting systems experiencing line surges during grid switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 36V input bus, activated within <1ps to limit transient duration seen by buck controller IC. Use Value: Extends lifetime of LED strings and driver MOSFETs by preventing gate oxide rupture and forward-bias overstress. |
Use Scenario: 48V-to-12V isolated DC-DC converters in telecom equipment encountering repetitive 10/1000µs surges from shared power distribution networks. IC Role / Device Role / Timing Role: Front-end transient suppressor upstream of input filter and primary-side controller. Use Value: Enables reliable operation without derating input capacitors or adding redundant clamping stages due to verified 600W single-pulse capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33A | Same DO-214AC (SMA) package; lower PPK (400W); VBR 36.7–40.6V; VC = 53.3V @ 7.5A. | Lower surge capacity limits use in high-energy automotive load-dump scenarios. | Select when space constraints favor SMA footprint and surge energy is ≤400W. |
| ON Semiconductor SMCJ33A | DO-214AB (SMC) package; higher PPK (1500W); same VWM/VBR/VC specs; RθJA = 25°C/W. | Requires larger PCB area but supports repeated surges and higher ambient temperatures. | Choose for industrial motor drives where thermal management and multi-pulse endurance are critical. |
Compared with SMBJ33AH, SMAJ33A offers smaller footprint but reduced surge margin, while SMCJ33A provides superior thermal and power handling at the cost of board space - making SMBJ33AH the balanced choice for space-constrained AEC-Q101-compliant 24V/36V systems.
Availability
SMBJ33AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and DC-DC converter designs requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMBJ33AH 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, specializing in TVS diodes, rectifiers, and power MOSFETs for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient protection in 12V/24V/48V automotive and harsh-environment industrial systems, emphasizing low clamping ratio, fast response, and robust thermal performance in compact SMB packages.
FAQ
What is the maximum clamping voltage of SMBJ33AH under a 10/1000µs surge?
The SMBJ33AH has a maximum clamping voltage (VC) of 53.3 V when subjected to a 10/1000 µs waveform at its rated peak impulse current of 11.8 A. This value is measured per ANSI/IEEE C62.35 and confirmed in the official Taiwan Semiconductor datasheet revision A2102, ensuring predictable overvoltage limiting for downstream ICs.
Is SMBJ33AH unidirectional or bidirectional?
SMBJ33AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its cathode-band marking and single-polarity electrical specifications. It protects against positive transients on the cathode side relative to anode (ground), and must not be used for bipolar surge suppression without external circuitry.
Does SMBJ33AH meet AEC-Q101 qualification?
Yes, SMBJ33AH is explicitly AEC-Q101 qualified per the Taiwan Semiconductor datasheet (Version A2102). It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock - validating its suitability for automotive underhood and chassis-mounted applications.
What is the thermal resistance RθJA of SMBJ33AH?
The SMBJ33AH has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W, measured under standard JEDEC test conditions (single-layer 1 in² copper pad, no airflow). This value enables accurate thermal modeling for PCB layout, especially in sealed enclosures or high-ambient-temperature environments.
How does SMBJ33AH differ from SMBJ33H?
SMBJ33AH has a tighter breakdown voltage range (36.7–40.6 V) versus SMBJ33H (36.7–44.9 V), resulting in more consistent clamping behavior and lower maximum VC (53.3 V vs. 59.0 V). This makes SMBJ33AH preferable in designs where precise overvoltage threshold control and minimal clamping overshoot are critical.
SMBJ33AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ33AH FAQ
1.How can I place an order for SMBJ33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33AH 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 SMBJ33AH reliable?
The price and inventory of SMBJ33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33AH is usually 5 days.
3.What payment methods are accepted for SMBJ33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33AH?
SMBJ33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33AH 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 SMBJ33AH?
For technical support, including SMBJ33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33AH requirements.
6.How does Aetrix verify that SMBJ33AH is sourced from the original manufacturer or authorized distributors?
All SMBJ33AH 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 SMBJ33AH meets industry standards.
7.What is the process for return or replacement of SMBJ33AH?
All SMBJ33AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33AH, 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 SMBJ33AH part is unused and in its original packaging.
Return procedure for SMBJ33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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