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Vishay General Semiconductor - Diodes Division 1.5SMC56A-E3/9AT
- Part No.:
- 1.5SMC56A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC56A-E3/9AT.pdf
- Description:
- TVS DIODE 47.8VWM 77VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,892
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Product details
Overview
1.5SMC56A-E3/9AT 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 56 V breakdown voltage (VBR = 53.2–58.8 V at 1 mA), 47.8 V stand-off voltage (VWM), clamps to ≤77.0 V at 19.5 A peak pulse current, and delivers 1500 W peak pulse power with a 10/1000 μs waveform - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5SMC56A-E3/9AT datasheet, 1.5SMC56A-E3/9AT pinout, 1.5SMC56A-E3/9AT application, or 1.5SMC56A-E3/9AT equivalent, this page provides verified package mapping (SMC/DO-214AB), polarity marking (cathode band), junction temperature limit (150 °C), thermal resistance (RθJA = 75 °C/W), and RoHS-compliant commercial-grade sourcing via 13" tape-and-reel (3500 pcs).
Technical Context
This unidirectional TVS operates as a clamping device that remains high-impedance below VWM = 47.8 V and rapidly transitions to low-impedance conduction above VBR = 53.2–58.8 V. Its glass-passivated junction ensures stable avalanche behavior under repetitive 10/1000 μs transients at 0.01% duty cycle.
Designed for PCB-level surge immunity, it exhibits fast response time (<1 ps), low incremental surge resistance, and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. The SMC (DO-214AB) package supports automated placement and delivers 1500 W peak pulse power on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 53.2 V / 58.8 V at 1 mA - defines precise avalanche initiation threshold for repeatable clamping onset |
| VWM | 47.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | ≤77.0 V at 19.5 A - clamping voltage during full 1500 W transient, limiting downstream stress |
| PPPM | 1500 W (10/1000 μs) - peak surge energy handling capacity without degradation |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C |
| TJ max | +150 °C - maximum allowable junction temperature, enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with cathode band marking and 0.220"–0.246" body width |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground reference | Low-voltage reference node during clamping; must be routed with minimal inductance to maintain response speed |
| Cathode | Current exit terminal in forward bias; marked with band; connects to line under protection | High-side connection point for transient energy diversion; band orientation confirms unidirectional polarity during placement |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems |
| Clamping ratio VC/VBR ≈ 1.37 | Minimizes overvoltage margin during surge events, reducing stress on downstream MOSFETs or ICs |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without pre-baking or special handling |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements without halogen restrictions or automotive qualification overhead |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in 12 V vehicle subsystems. IC Role / Device Role: Unidirectional clamping TVS placed between signal line and chassis ground, absorbing >100 A surge currents without failure. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V interface ICs by limiting transient voltage to ≤77.0 V during 1500 W events. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to 24 V DC field wiring with long cable runs and relay coil back-EMF. IC Role / Device Role: Primary overvoltage clamp on each channel's input node, coordinated with series current-limiting resistors. Use Value: Maintains functional integrity during repeated 1 kV/500 A surge tests per IEC 61000-4-4, avoiding system resets or false triggering. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
|
Use Scenario: Secondary-side transient suppression on 5–19 V DC outputs of wall adapters and USB PD chargers subjected to ESD and conducted noise. IC Role / Device Role: Final-stage protector downstream of primary-side MOVs and common-mode chokes. Use Value: Limits residual overshoot to <80 V, ensuring safe operation of USB-C controller ICs and battery management circuits. |
Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers in network edge equipment exposed to lightning-induced surges on twisted-pair lines. IC Role / Device Role: Unidirectional clamp referenced to local ground, paired with bidirectional TVS for differential mode suppression. Use Value: Achieves <10 ns response to 10/1000 μs transients, preventing data corruption or PHY latch-up in 10/100/1000BASE-T systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ56A-E3/52T | Lower PPPM (600 W), same VBR range, SMB package (smaller footprint, higher RθJA) | Better suited for space-constrained consumer electronics where 1500 W rating is unnecessary | Select when board area is limited and surge threat level is ≤IEC 61000-4-5 Level 2 |
| 1.5KE56A | Through-hole DO-201 package, identical electrical specs but incompatible mounting and thermal profile | Used in legacy industrial power supplies requiring manual assembly or high-reliability through-hole construction | Choose only when redesigning for SMT is not feasible and thermal pad layout cannot accommodate SMC |
Compared with SMBJ56A-E3/52T, the 1.5SMC56A-E3/9AT delivers 2.5× higher surge power handling and superior thermal dissipation due to larger SMC pad area; versus 1.5KE56A, it enables automated manufacturing and reduces assembly cost while maintaining identical clamping performance.
Availability
1.5SMC56A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter outputs, and telecom line card designs requiring stable component supply across production lifecycles.
Supply support for 1.5SMC56A-E3/9AT 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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The 1.5SMC Series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness and repeatable clamping performance are mandatory.
FAQ
What is the maximum clamping voltage of the 1.5SMC56A-E3/9AT under full-rated surge conditions?
The 1.5SMC56A-E3/9AT clamps to a maximum of 77.0 V when subjected to its rated 19.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88303 and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events. Designers use this parameter to verify margin against absolute maximum ratings of protected ICs.
Does the 1.5SMC56A-E3/9AT meet automotive qualification standards?
No - the 1.5SMC56A-E3/9AT carries the E3 suffix, indicating RoHS-compliant commercial grade only. For AEC-Q101 qualification, Vishay offers the 1.5SMC56AHE3_A variant (with HE3 suffix and revision code). The 1.5SMC56A-E3/9AT is suitable for non-automotive industrial and consumer applications where full automotive qualification is not required.
How does the SMC package of the 1.5SMC56A-E3/9AT compare thermally to the SMB package?
The SMC (DO-214AB) package of the 1.5SMC56A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, significantly lower than the ~110–130 °C/W of SMB packages like SMBJ56A. This allows the 1.5SMC56A-E3/9AT to sustain higher average power dissipation and operate reliably at elevated ambient temperatures when mounted on recommended 8.0 mm × 8.0 mm copper pads.
Can the 1.5SMC56A-E3/9AT be used in bidirectional configurations?
No - the 1.5SMC56A-E3/9AT is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay specifies part numbers ending in "CA", such as 1.5SMC56CA. Using the unidirectional 1.5SMC56A-E3/9AT in AC or floating signal paths risks forward conduction and failure during negative half-cycles.
What is the meaning of the "/9AT" suffix in 1.5SMC56A-E3/9AT?
The "/9AT" suffix denotes packaging: 13-inch diameter plastic tape-and-reel with 3500 units per reel. This contrasts with "/57T", which indicates a 7-inch reel containing 850 units. Both share identical electrical and mechanical specifications; the suffix solely identifies reel size and quantity for logistics and SMT feeder compatibility.
1.5SMC56A-E3/9AT 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- 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)
1.5SMC56A-E3/9AT FAQ
1.How can I place an order for 1.5SMC56A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC56A-E3/9AT 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 1.5SMC56A-E3/9AT reliable?
The price and inventory of 1.5SMC56A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC56A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC56A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC56A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC56A-E3/9AT?
1.5SMC56A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC56A-E3/9AT 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 1.5SMC56A-E3/9AT?
For technical support, including 1.5SMC56A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC56A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC56A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC56A-E3/9AT 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 1.5SMC56A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC56A-E3/9AT?
All 1.5SMC56A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC56A-E3/9AT, 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 1.5SMC56A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC56A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC56A-E3/9AT Tags
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