My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5SMC43A-M3/9AT
- Part No.:
- 1.5SMC43A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC43A-M3/9AT.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC43A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 43 V breakdown voltage (VBR = 40.9–45.2 V at 1 mA), 36.8 V stand-off voltage (VWM), 59.3 V maximum clamping voltage (VC) at 25.3 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the 1.5SMC43A-M3/9AT datasheet, 1.5SMC43A-M3/9AT pinout, 1.5SMC43A-M3/9AT application, or 1.5SMC43A-M3/9AT equivalent, key selection considerations include its unidirectional polarity, SMC (DO-214AB) package thermal performance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), halogen-free RoHS compliance, and clamping behavior under repetitive transients per JESD22-B102 solderability standards.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (36.8 V), it transitions from high-impedance blocking to low-impedance conduction at VBR (min 40.9 V), limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and fast response (<1 ns).
The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine), supports continuous power dissipation of 6.5 W on infinite heatsink at 50 °C, and maintains operation across -65 °C to +150 °C junction temperature range - enabling use in under-hood automotive modules and industrial PLC backplanes where thermal cycling and ESD immunity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 36.8 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 40.9–45.2 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping) | 59.3 V at 25.3 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream IC survivability. |
| PPPM | 1500 W - Peak pulse power handling capacity; validates suitability for lightning-induced surges (IEC 61000-4-5 Level 4). |
| IPPM | 25.3 A - Maximum single-pulse surge current supported; sets minimum PCB trace width and grounding path design requirements. |
| TJmax | +150 °C - Maximum junction temperature; enables placement near heat sources without derating penalties in compact layouts. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs thermal pad sizing and airflow needs for sustained surge duty cycles. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line (e.g., VIN or signal) | Must be routed to source side of protected node; determines directionality of clamping action. |
| Cathode | Current exit point in forward bias; tied to system ground or return path | Band-marked terminal; connects to low-impedance earth or chassis ground to ensure effective surge diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validates protection against IEC 61000-4-5 combination wave surges up to 4 kV open-circuit / 2 kA short-circuit. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD >15 kV), preserving signal integrity in high-speed interfaces. |
| MSL Level 1 (J-STD-020), 260 °C reflow peak | Enables standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations for environmentally regulated end equipment. |
| AEC-Q101 qualification option (HM3 suffix) | Supports automotive-grade reliability validation including HTGB, HTRB, and temperature cycling for engine control units and ADAS sensors. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump spikes and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between sensor supply line and chassis ground, triggered within <1 ns upon exceeding 36.8 V. Use Value: Limits transient voltage to ≤59.3 V during 100 V/50 ms load dump events, preventing damage to 5 V or 3.3 V ASICs and ensuring ASIL-B functional safety compliance. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector entry point, conducting only during >36.8 V transients while remaining invisible to normal 24 V logic levels. Use Value: Absorbs 1500 W surges without degradation, eliminating need for external series impedance and maintaining <1 μA leakage at nominal voltage for accurate level detection. |
| DC Power Rail Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary overvoltage protection on 48 V telecom power supplies and PoE injectors after primary MOV-based filtering. IC Role / Device Role / Timing Role: Fast-response clamping element placed downstream of bulk filter capacitors to suppress residual ringing and switching noise spikes. Use Value: Clamps 10/1000 μs surges to 59.3 V with <1 ns response, preventing latch-up in DC-DC controllers and reducing need for oversized output capacitance. |
Use Scenario: Protecting Ethernet PHYs and DSL line drivers from lightning-induced common-mode surges entering via RJ-45 jacks in network edge devices. IC Role / Device Role / Timing Role: Unidirectional TVS used in conjunction with common-mode chokes and bidirectional devices to manage asymmetrical surge paths in differential pairs. Use Value: Provides precise 36.8 V standoff with 59.3 V clamping, enabling tighter voltage margins than generic Zener arrays and improving immunity to TIA-968-B Class B surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A-E3/52T (Vishay) | Same VWM/VBR/VC, but SMB package (DO-214AA); lower PPPM = 600 W; RθJA = 85 °C/W | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load-dump scenarios requiring 1500 W | Select when board space is constrained and surge threat level is ≤600 W - not a drop-in replacement due to reduced power rating and thermal performance. |
| 1.5KE43A (ON Semiconductor) | Through-hole DO-201 package; identical electrical specs but higher RθJA ≈ 100 °C/W; no MSL Level 1 or halogen-free certification | Requires wave soldering; incompatible with automated SMT lines; lacks automotive qualification path | Choose only for legacy through-hole designs or prototyping where reflow compatibility and environmental compliance are not required. |
Compared with SMBJ43A-E3/52T and 1.5KE43A, the 1.5SMC43A-M3/9AT delivers superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal management), full SMT process support, and halogen-free compliance - making it the preferred choice for high-reliability, volume-manufactured automotive and industrial systems.
Availability
1.5SMC43A-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, and 48 V DC power rail surge suppression requiring stable component supply across multi-year production programs.
Supply support for 1.5SMC43A-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and application-specific optimization.
The 1.5SMC Series was engineered for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC43A-M3/9AT under a 10/1000 μs surge?
The 1.5SMC43A-M3/9AT has a maximum clamping voltage (VC) of 59.3 V at 25.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC43A-M3/9AT suitable for automotive applications?
The 1.5SMC43A-M3/9AT itself is not AEC-Q101 qualified, but the HM3 suffix variant (e.g., 1.5SMC43AHM3_X) is fully AEC-Q101 qualified. The M3 suffix indicates halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance - making the 1.5SMC43A-M3/9AT appropriate for commercial-automotive hybrid systems where full qualification is not mandated, provided thermal and surge margins are validated per application.
What does the "M3" suffix mean in 1.5SMC43A-M3/9AT?
The "M3" suffix in 1.5SMC43A-M3/9AT denotes halogen-free, RoHS-compliant construction meeting IPC-1752A material declarations, along with JESD201 Class 2 whisker resistance and matte tin-plated leads compliant with J-STD-002 and JESD22-B102. It distinguishes this variant from the E3 (RoHS-compliant, non-halogen-free) and HE3/HM3 (AEC-Q101 qualified) versions.
How does the 1.5SMC43A-M3/9AT compare to bidirectional TVS diodes like 1.5SMC43CA?
The 1.5SMC43A-M3/9AT is unidirectional and intended for DC line protection where polarity is fixed (e.g., VCC-to-ground), offering tighter leakage control (<1 μA at VWM). In contrast, 1.5SMC43CA is bidirectional, suited for AC or differential signal lines (e.g., RS-485), with symmetrical clamping in both directions but higher leakage. They are not interchangeable without circuit redesign due to polarity and leakage differences.
What is the thermal resistance of the 1.5SMC43A-M3/9AT, and how does it affect layout?
The 1.5SMC43A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout (0.31″ × 0.31″ copper pads). To maintain reliability under repeated surges, PCB layout must provide adequate copper area and thermal vias - undersized pads increase junction temperature, accelerating degradation and raising VC during subsequent pulses.
1.5SMC43A-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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- 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)
1.5SMC43A-M3/9AT FAQ
1.How can I place an order for 1.5SMC43A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC43A-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 1.5SMC43A-M3/9AT reliable?
The price and inventory of 1.5SMC43A-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 1.5SMC43A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC43A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC43A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC43A-M3/9AT?
1.5SMC43A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC43A-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 1.5SMC43A-M3/9AT?
For technical support, including 1.5SMC43A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC43A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC43A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC43A-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 1.5SMC43A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC43A-M3/9AT?
All 1.5SMC43A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC43A-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 1.5SMC43A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC43A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC43A-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 …
