My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5SMC33A-M3/9AT
- Part No.:
- 1.5SMC33A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33A-M3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,060
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC33A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 28.2 V stand-off voltage (VWM), clamps transients to ≤45.7 V at 32.8 A peak pulse current (10/1000 µs), and delivers 1500 W peak pulse power - ideal for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the 1.5SMC33A-M3/9AT datasheet, 1.5SMC33A-M3/9AT pinout, 1.5SMC33A-M3/9AT application, or 1.5SMC33A-M3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge capability, 28.2 V working voltage, low clamping ratio (VC/VWM ≈ 1.62), and halogen-free RoHS-compliant M3 suffix packaging suitable for automated SMT assembly.
Technical Context
The 1.5SMC33A-M3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient overvoltages. Its 1500 W peak pulse power rating is defined under standardized 10/1000 µs waveform conditions with 0.01% duty cycle, and thermal performance is characterized by RθJA = 75 °C/W and RθJL = 15 °C/W.
It exhibits low incremental surge resistance and excellent clamping linearity, with maximum reverse leakage of 1.0 µA at VWM, and operates across -65 °C to +150 °C junction temperature range. The cathode band marking confirms polarity, and it meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - defines reliable avalanche initiation threshold for overvoltage triggering |
| VWM | 28.2 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | ≤45.7 V at 32.8 A - clamping voltage during 1500 W transient, ensuring protected circuit stays below safe limits |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform, critical for lightning and inductive-switching surge immunity |
| IPPM | 32.8 A - peak pulse current capacity, directly supporting high-energy transient suppression |
| TJ max | +150 °C - enables reliable operation in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" x 0.246" footprint and matte tin-plated leads |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, unidirectional configuration with cathode band marking on one end. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); mounting pad layout per Vishay recommended 8.0 mm × 8.0 mm copper pads per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference | Provides low-forward-voltage path during surge conduction; must be routed with low-inductance grounding |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., VIN, signal rail) | Defines polarity-sensitive placement - band side connects to the node requiring overvoltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without derating in standard PCB layouts |
| Low clamping voltage (VC/VWM = 1.62) | Minimizes stress on downstream components - e.g., keeps 3.3 V or 5 V logic rails within safe margin during clamping |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge performance |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow assembly without preconditioning or special handling |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator-induced transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going surges above 28.2 V. Use Value: Clamps to ≤45.7 V within nanoseconds, preventing damage to LDOs, microcontrollers, and CAN transceivers downstream. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors from ESD and field wiring transients. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to shunt fast transients before reaching precision amplifier inputs. Use Value: Maintains signal integrity with <1 µA leakage at 28.2 V, while surviving repeated 1500 W pulses without parameter shift. |
| DC-DC Converter Input Stage | Telecom Interface Protection |
|
Use Scenario: Safeguarding buck converter front-end against inductive kickback from relay coils or motor drivers in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN rail, positioned upstream of input filter capacitors and controller IC. Use Value: Absorbs 32.8 A transient peaks without thermal runaway, preserving converter uptime and reducing need for oversized input capacitance. |
Use Scenario: Protecting Ethernet PHY or RS-485 transceivers from lightning-induced surges on outdoor cabling in building management systems. IC Role / Device Role / Timing Role: First-stage TVS on data line pair (e.g., TX+/TX−), referenced to local ground plane. Use Value: Delivers 1500 W surge rating with fast response to meet IEC 61000-4-5 surge immunity requirements for Class B equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52T (Vishay) | Lower peak power (600 W), SMB package (smaller footprint), same VWM/VBR range | Best suited for space-constrained consumer or portable designs where 1500 W is not required | Select when board area is limited and surge threat level is moderate (e.g., IEC 61000-4-2 ESD only) |
| 1.5KE33A (ON Semiconductor) | Through-hole DO-201 package, identical electrical specs but incompatible mounting and thermal profile | Used in legacy or high-reliability through-hole assemblies where reworkability and mechanical robustness are prioritized | Choose only if existing PCB design mandates axial/DO-201 footprint and manual assembly is acceptable |
Compared with SMBJ33A-E3/52T and 1.5KE33A, the 1.5SMC33A-M3/9AT uniquely balances high 1500 W surge capability with SMC surface-mount compatibility, halogen-free compliance, and automotive-grade thermal robustness - making it optimal for new-generation automotive and industrial SMT production.
Availability
1.5SMC33A-M3/9AT is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor interfaces, DC-DC converter inputs, and telecom line protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC33A-M3/9AT 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The 1.5SMC33A-M3/9AT belongs to Vishay's TRANSZORB® SMC-series TVS family, engineered for high-power transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom infrastructure where compact size, high surge rating, and AEC-Q101 readiness matter.
FAQ
What is the maximum clamping voltage of the 1.5SMC33A-M3/9AT under rated surge conditions?
The 1.5SMC33A-M3/9AT has a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 32.8 A (10/1000 µs waveform). This value is measured per JEDEC standards and ensures protected circuits remain within safe operating margins during transient events. The 1.5SMC33A-M3/9AT achieves this clamping performance while maintaining low incremental resistance and stable thermal behavior up to +150 °C junction temperature.
Is the 1.5SMC33A-M3/9AT suitable for automotive applications?
Yes - the 1.5SMC33A-M3/9AT is halogen-free, RoHS-compliant (M3 suffix), and qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes. While the base 1.5SMC33A-M3/9AT is commercial-grade, its construction (glass-passivated junction, MSL Level 1, 150 °C TJ max) and electrical robustness make it widely deployed in non-safety-critical automotive subsystems such as body control modules and infotainment power rails. For certified automotive use, specify 1.5SMC33AHM3_A/9AT.
What does the "M3" suffix mean in 1.5SMC33A-M3/9AT?
The "M3" suffix in 1.5SMC33A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting IPC/JEDEC standards for environmentally conscious manufacturing. It denotes matte tin-plated leads, JESD201 Class 2 whisker resistance, and compliance with Vishay's material categorization per doc#99912. This distinguishes it from E3 (RoHS-compliant but not halogen-free) and HM3 (AEC-Q101 qualified + halogen-free) variants.
How does the 1.5SMC33A-M3/9AT compare to bidirectional TVS diodes like 1.5SMC33CA?
The 1.5SMC33A-M3/9AT is unidirectional and intended for DC rail protection where polarity is fixed (e.g., +12 V input to ground), offering lower leakage and tighter VBR tolerance than bidirectional types. In contrast, 1.5SMC33CA protects AC or floating signals and conducts in both directions - but exhibits higher reverse leakage and slightly reduced surge margin due to dual-junction structure. Use 1.5SMC33A-M3/9AT when protecting polarized supplies; choose 1.5SMC33CA only for symmetrical or AC-coupled lines.
What is the thermal resistance of the 1.5SMC33A-M3/9AT, and how does it affect layout?
The 1.5SMC33A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-leads (RθJL) of 15 °C/W. To maintain safe operation under repetitive surges, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal as specified in the datasheet. Reducing pad size increases RθJA, risking thermal runaway during sustained transient activity - especially critical in enclosed automotive or industrial enclosures.
1.5SMC33A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- 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):
- 32.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC33A-M3/9AT FAQ
1.How can I place an order for 1.5SMC33A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33A-M3/9AT 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 1.5SMC33A-M3/9AT reliable?
The price and inventory of 1.5SMC33A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC33A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33A-M3/9AT?
1.5SMC33A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33A-M3/9AT 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 1.5SMC33A-M3/9AT?
For technical support, including 1.5SMC33A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC33A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33A-M3/9AT 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 1.5SMC33A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC33A-M3/9AT?
All 1.5SMC33A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33A-M3/9AT, 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 1.5SMC33A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC33A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33A-M3/9AT 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
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 …
