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Taiwan Semiconductor Corporation 1.5SMC33AH
- Part No.:
- 1.5SMC33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33AH.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
1.5SMC33AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 31.4–34.7V breakdown voltage at 1mA test current, and 45.7V maximum clamping voltage at 34A peak impulse current. It protects power rails and I/O lines in automotive body electronics against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5SMC33AH datasheet, 1.5SMC33AH pinout, 1.5SMC33AH application, or 1.5SMC33AH equivalent, this AEC-Q101 qualified TVS offers verified clamping performance, <1μA leakage above 28.2V working stand-off voltage, and fast sub-picosecond response-critical for ESD and load-dump immunity in compact, high-reliability PCB layouts.
Technical Context
The 1.5SMC33AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling robust surge handling without degradation under repeated 1ms 1500W pulses. Its thermal resistance of 15°C/W (junction-to-case) supports sustained operation up to +150°C junction temperature.
Designed for compliance with ISO 7637-2, it delivers defined clamping behavior across Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), and Pulse 3b (capacitive coupled transients), with VC = 45.7V at IPPM = 34A ensuring downstream ICs remain below safe voltage thresholds during worst-case events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 31.4V / 34.7V at 1mA - defines precise avalanche initiation window for predictable turn-on during overvoltage events |
| VWM | 28.2V - maximum continuous reverse operating voltage before leakage exceeds 1μA, setting safe DC bias margin |
| VC @ IPPM | 45.7V at 34A - clamped voltage seen by protected circuit during 10/1000μs surge, limiting stress on downstream components |
| PPK | 1500W - peak pulse power rating per 1ms waveform, enabling protection against high-energy automotive transients |
| IR @ VWM | <1μA - ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150°C - maximum junction temperature allowing operation in under-hood automotive environments |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210g mass and J-STD-002 solderable matte tin leads |
Pinout & Package
DO-214AB (SMC) package: molded plastic case meeting UL 94V-0 flammability rating; cathode indicated by band-marked end; terminals are matte tin-plated leads compliant with JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to ground or low-side return in unidirectional configuration; conducts during forward surge (e.g., reverse battery) |
| Cathode (banded end) | Avalanche clamping node | Connected to protected line (e.g., 24V rail); initiates breakdown when reverse voltage exceeds VBR, shunting surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under humidity and thermal stress |
| ISO 7637-2 compliance | Guaranteed clamping performance across all five standardized automotive transient waveforms (Pulse 1/2a/2b/3a/3b) |
| Sub-1ps response time | Enables suppression of nanosecond-scale ESD events before sensitive logic or analog inputs are damaged |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow-no baking required, simplifying SMT assembly logistics |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 24V CAN/LIN bus power rails from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between fused 24V supply and local regulator input. Use Value: Limits transient voltage to ≤45.7V during ISO 7637-2 Pulse 1 (−100V/50ms), preventing LDO dropout and microcontroller brownout. | Use Scenario: Shielding 24V discrete input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary surge arrestor on each opto-isolator input leg, upstream of series current-limiting resistor. Use Value: Absorbs 1500W pulses without degradation, maintaining <1μA leakage to preserve input threshold accuracy over 10+ year service life. |
| Telecom Power Supply Front-End | Medical Diagnostic Equipment I/O Port |
Use Scenario: Safeguarding AC/DC adapter secondary-side 24V output against lightning-induced surges on long interconnect cables. IC Role / Device Role / Timing Role: Secondary-side TVS mounted adjacent to connector, referenced to system ground. Use Value: Clamps 10/1000μs surges to 45.7V within 1ps, protecting downstream DC-DC converters and reducing need for oversized input capacitors. | Use Scenario: Hardening RS-232/RS-485 ports on ultrasound or MRI control panels against ESD and electrocautery interference. IC Role / Device Role / Timing Role: Bidirectional protection element (using 1.5SMC33CAH variant) on differential signal pairs. Use Value: Enables 30kV contact ESD immunity per IEC 61000-4-2 while maintaining signal integrity due to low junction capacitance (<100pF typical). |
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, DO-214AA (SMB) package, 53.3V clamping at 11.8A | Lower power handling limits use to lower-energy transients; smaller footprint reduces board area but increases thermal density | Select when space-constrained designs tolerate reduced surge margin and operate below 100°C ambient |
| 1.5KE33A | Through-hole TO-204AA (DO-41), 1500W, 53.3V clamping at 28.3A | Requires manual or wave soldering; incompatible with automated SMT lines; higher thermal resistance (70°C/W) | Choose only for legacy through-hole systems or prototyping where rework flexibility outweighs production efficiency |
Compared with SMBJ33A and 1.5KE33A, the 1.5SMC33AH delivers identical 1500W surge capability in an SMT-optimized DO-214AB package with superior thermal resistance (15°C/W vs. 70°C/W) and AEC-Q101 validation-making it the preferred choice for volume automotive and industrial production.
Availability
1.5SMC33AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom power front-end designs requiring stable component supply, AEC-Q101 compliance, and consistent 1500W surge immunity.
Supply support for 1.5SMC33AH 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 certified production lines.
The 1.5SMCxxAH series was engineered specifically for automotive and industrial transient suppression, emphasizing high-reliability packaging, tight VBR tolerance, and guaranteed ISO 7637-2 waveform compliance across temperature.
FAQ
What is the maximum clamping voltage of the 1.5SMC33AH under standard 10/1000μs surge conditions?
The 1.5SMC33AH has a maximum clamping voltage (VC) of 45.7V at 34A peak impulse current (IPPM) under the standardized 10/1000μs double-exponential surge waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain within safe operating voltage limits during ISO 7637-2 Pulse 1 and Pulse 2b events. The 1.5SMC33AH maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC33AH suitable for bidirectional transient protection?
No-the 1.5SMC33AH is a unidirectional TVS diode intended for DC-biased lines like 24V automotive supplies. For bidirectional protection (e.g., AC signal lines or data buses), the pin-compatible 1.5SMC33CAH variant must be used. The 1.5SMC33AH's cathode band marking and internal structure support only reverse-biased avalanche clamping; applying significant forward voltage may exceed its 3.5V forward voltage rating and cause failure.
Does the 1.5SMC33AH meet AEC-Q101 requirements for automotive under-hood applications?
Yes-the 1.5SMC33AH is explicitly AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock per the AEC-Q101 standard. Its DO-214AB package and 150°C maximum junction temperature rating make it suitable for under-hood locations such as engine control units and body control modules where ambient temperatures reach 125°C.
What is the working stand-off voltage (VWM) and why is it critical for selecting the 1.5SMC33AH?
The 1.5SMC33AH has a working stand-off voltage (VWM) of 28.2V, meaning it remains non-conductive with leakage <1μA up to this DC or RMS voltage. This parameter is critical because VWM must exceed the system's maximum normal operating voltage (e.g., 24V ±10% = 26.4V) while leaving sufficient margin to avoid false triggering. Selecting a part with insufficient VWM causes excessive leakage and potential malfunction; the 1.5SMC33AH's 28.2V rating provides 1.8V margin over 24V nominal systems.
How does the 1.5SMC33AH's thermal resistance impact PCB layout decisions?
The 1.5SMC33AH has a junction-to-case thermal resistance (RθJC) of 15°C/W, meaning each watt dissipated raises the junction temperature 15°C above the case temperature. To maintain TJ ≤150°C in a 100°C ambient environment, the PCB must provide adequate copper area (≥100mm² per side) and thermal vias beneath the cathode pad to keep case temperature low. Insufficient copper will cause premature thermal shutdown or parametric drift during repetitive surge events.
1.5SMC33AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 34A
- 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)
1.5SMC33AH FAQ
1.How can I place an order for 1.5SMC33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33AH 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 1.5SMC33AH reliable?
The price and inventory of 1.5SMC33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33AH is usually 5 days.
3.What payment methods are accepted for 1.5SMC33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33AH?
1.5SMC33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33AH 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 1.5SMC33AH?
For technical support, including 1.5SMC33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33AH requirements.
6.How does Aetrix verify that 1.5SMC33AH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33AH 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 1.5SMC33AH meets industry standards.
7.What is the process for return or replacement of 1.5SMC33AH?
All 1.5SMC33AH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33AH, 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 1.5SMC33AH part is unused and in its original packaging.
Return procedure for 1.5SMC33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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