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Vishay General Semiconductor - Diodes Division 1.5SMC400AHM3_A/I
- Part No.:
- 1.5SMC400AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC400AHM3_A/I.pdf
- Description:
- TVS DIODE 342VWM 548VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,595
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Product details
Overview
1.5SMC400AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in power rails and signal lines. It features a 400 V standoff voltage (VWM), 459 V minimum breakdown voltage (VBR), 1500 W peak pulse power (10/1000 µs), and clamps transients to 548 V at 2.7 A peak pulse current - deployed in automotive power modules, industrial motor drives, and telecom DC input stages.
For engineers reviewing the 1.5SMC400AHM3_A/I datasheet, 1.5SMC400AHM3_A/I pinout, 1.5SMC400AHM3_A/I application, or 1.5SMC400AHM3_A/I equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, AEC-Q101 qualification status, clamping voltage margin versus system overvoltage tolerance, and thermal derating above 25 °C ambient.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (>1 µA leakage at 342 V), but triggers into low-impedance conduction when transient voltage exceeds its 459 V (min) breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and fast response (<1 ns).
Designed for repetitive 10/1000 µs surge waveforms at 0.01% duty cycle, it delivers 1500 W peak pulse power with 15 °C/W junction-to-lead thermal resistance and 75 °C/W junction-to-ambient rating on standard 8 mm × 8 mm copper pads - enabling robust protection without active cooling in space-constrained SMT layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 342 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail operating margin. |
| VBR (Breakdown Voltage) | 380–420 V at 1 mA - precise avalanche onset range ensuring predictable triggering without premature conduction. |
| VC (Clamping Voltage) | 548 V at IPPM = 2.7 A - actual voltage seen by protected circuit during full-rated surge; critical for downstream IC survivability. |
| PPPM (Peak Pulse Power) | 1500 W (10/1000 µs) - energy-handling capacity for lightning-induced or inductive-switching transients per industry standard waveform. |
| IR (Reverse Leakage) | 1 µA max at VWM - negligible standby current that avoids loading sensitive reference or monitoring circuits. |
| TJ max | 150 °C - maximum junction temperature enabling operation in under-hood automotive or enclosed industrial enclosures. |
| AEC-Q101 Qualified | Yes - qualified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A110/A111. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode (unmarked end) | Reference/return node | Typically tied to system ground or low-impedance return path; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity without external series impedance in many DC applications. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients, improving protection margin for 48 V–400 V systems. |
| MSL Level 1 (260 °C reflow) | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where long-term reliability under thermal stress is mandatory. |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift in harsh environments. |
Applications
| Automotive DC-DC Converter Input Protection | Industrial PLC Power Rail Clamping |
|---|---|
Use Scenario: Protects 48 V–300 V input stage of automotive buck converters against load dump (ISO 7637-2 Pulse 5a) and alternator surges. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, triggered within <1 ns to clamp transients below MOSFET drain-source breakdown. Use Value: Withstands 1500 W pulses while limiting clamped voltage to 548 V - preserving 600 V-rated power MOSFETs and avoiding gate oxide stress. |
Use Scenario: Shields 24 V/48 V backplane rails in programmable logic controllers from relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Standby-mode protector across supply rails; activated only during >342 V transients, drawing no steady-state current. Use Value: 1 µA max leakage prevents false tripping of undervoltage lockout (UVLO) circuits while maintaining tight 548 V clamping ceiling. |
| Telecom Remote Radio Unit (RRU) Power Input | Solar Inverter DC Link Surge Suppression |
Use Scenario: Safeguards outdoor 48 V DC power inputs of 5G RRUs exposed to induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Primary front-end TVS in multi-stage protection scheme; absorbs bulk surge energy before downstream MOVs or GDTs. Use Value: 1500 W rating and DO-214AB footprint allow compact placement near connector, minimizing PCB trace inductance and voltage overshoot. |
Use Scenario: Installed across PV string inputs (up to 1000 VDC) of central inverters to suppress switching transients from contactor operation. IC Role / Device Role / Timing Role: Secondary clamping device after upstream Class II SPDs; handles fast-rising edge components missed by slower protectors. Use Value: 380–420 V VBR range aligns with 400 V nominal DC link, enabling precise coordination with upstream overvoltage thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ400A-E3/57T | Same 400 V VWM, but lower 400 W PPPM rating and SMA package (smaller thermal mass). | Limited to lower-energy transients (e.g., ESD, IEC 61000-4-2); unsuitable for IEC 61000-4-5 Level 3+ surges. | Select when board space is constrained and surge threat level is limited to sub-1 kV events. |
| 1.5KE400A | Through-hole DO-201 package, identical electrical specs but higher RθJA (100 °C/W vs. 75 °C/W) and no AEC-Q101 qualification. | Requires wave soldering; not approved for automotive under-hood use; less suitable for automated SMT lines. | Choose for legacy through-hole designs or cost-sensitive non-automotive industrial applications where reflow compatibility is not required. |
Compared with SMAJ400A-E3/57T and 1.5KE400A, the 1.5SMC400AHM3_A/I uniquely combines AEC-Q101 qualification, 1500 W surge capability in SMT format, and halogen-free construction - making it the only option qualified for high-reliability automotive and telecom infrastructure deployments requiring both performance and compliance.
Availability
1.5SMC400AHM3_A/I is available at Aetrix Electronics and suitable for automotive power modules, industrial PLCs, telecom remote radio units, and solar inverter DC links requiring stable component supply across extended product lifecycles.
Supply support for 1.5SMC400AHM3_A/I 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series targets high-power transient suppression in space-constrained SMT applications, with design emphasis on automotive-grade ruggedness, repeatable clamping performance, and compatibility with lead-free reflow processes.
FAQ
What is the clamping voltage of the 1.5SMC400AHM3_A/I at its rated peak pulse current?
The 1.5SMC400AHM3_A/I clamps to a maximum of 548 V at its rated peak pulse current of 2.7 A (10/1000 µs waveform). This value is measured under standardized test conditions with specified mounting pad layout and represents the upper limit of voltage imposed on the protected circuit during a full-rated surge event. The 1.5SMC400AHM3_A/I maintains this clamping performance across its operational temperature range, supporting robust system-level surge immunity design.
Is the 1.5SMC400AHM3_A/I qualified for automotive applications?
Yes, the 1.5SMC400AHM3_A/I carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22 standards - making it suitable for under-hood and body electronics applications where long-term reliability under thermal and mechanical stress is required. The 1.5SMC400AHM3_A/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What does the "_A/I" suffix mean in 1.5SMC400AHM3_A/I?
The "_A" denotes the voltage variant (400 V VWM) and AEC-Q101 qualification tier for the 1.5SMC400A family, while "/I" specifies packaging in 13-inch diameter plastic tape and reel containing 3500 units. This format enables high-speed pick-and-place assembly and supports large-volume production runs. The 1.5SMC400AHM3_A/I is distinct from /H-packaged variants (850 units per 7-inch reel) and non-HM3 commercial versions lacking automotive qualification.
Can the 1.5SMC400AHM3_A/I be used in bidirectional configurations?
No, the 1.5SMC400AHM3_A/I is a unidirectional TVS diode, as confirmed by its part number structure (no "C" suffix) and datasheet specifications. Bidirectional variants in the same series use the "CA" suffix (e.g., 1.5SMC400CA). Using the 1.5SMC400AHM3_A/I in reverse-biased AC applications would result in forward conduction and failure. For bidirectional protection at 400 V, select the 1.5SMC400CA-HM3_A/I or equivalent.
What is the thermal resistance of the 1.5SMC400AHM3_A/I, and how does it affect layout?
The 1.5SMC400AHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe operation at full 1500 W pulse rating, PCB layout must provide adequate copper area and minimize thermal bottlenecks - especially critical in automotive and industrial applications where ambient temperatures exceed 85 °C. Derating curves in the 1.5SMC400AHM3_A/I datasheet guide thermal design for elevated ambient conditions.
1.5SMC400AHM3_A/I 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 342V
- Voltage - Breakdown (Min):
- 380V
- Voltage - Clamping (Max) @ Ipp:
- 548V
- Current - Peak Pulse (10/1000µs):
- 2.7A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC400AHM3_A/I FAQ
1.How can I place an order for 1.5SMC400AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC400AHM3_A/I 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 1.5SMC400AHM3_A/I reliable?
The price and inventory of 1.5SMC400AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC400AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC400AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC400AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC400AHM3_A/I?
1.5SMC400AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC400AHM3_A/I 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 1.5SMC400AHM3_A/I?
For technical support, including 1.5SMC400AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC400AHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC400AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC400AHM3_A/I 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 1.5SMC400AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC400AHM3_A/I?
All 1.5SMC400AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC400AHM3_A/I, 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 1.5SMC400AHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC400AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC400AHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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