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Vishay General Semiconductor - Diodes Division 1.5SMC51AHM3_A/I
- Part No.:
- 1.5SMC51AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51AHM3_A/I.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,284
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Product details
Overview
1.5SMC51AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at IT = 1.0 mA), 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial sensor interfaces, and DC power rails.
For engineers reviewing the 1.5SMC51AHM3_A/I datasheet, 1.5SMC51AHM3_A/I pinout, 1.5SMC51AHM3_A/I application, or 1.5SMC51AHM3_A/I equivalent, this device delivers AEC-Q101 qualification, halogen-free RoHS compliance, SMC (DO-214AB) surface-mount package compatibility, and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 43.6 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Thermal design relies on RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), with derating above TA = 25 °C per Fig. 2. It supports 200 A non-repetitive forward surge (8.3 ms half-sine) and operates across –65 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at IT = 1.0 mA - defines precise avalanche onset window for reliable clamping threshold setting |
| VWM | 43.6 V - maximum continuous reverse operating voltage; ensures no conduction during normal 42 V automotive or 36 V industrial rail operation |
| VC @ IPPM | 70.1 V at 21.4 A - clamping voltage under 10/1000 µs surge; limits downstream IC stress to safe levels below 75 V |
| PPPM | 1500 W - peak pulse power handling capability; sustains IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without failure |
| IFSM | 200 A - 8.3 ms single half-sine surge rating; protects against load dump transients in 12 V/24 V vehicle systems |
| TJ max | +150 °C - enables operation in under-hood automotive environments and high-ambient industrial enclosures |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement for power dissipation |
Pinout & Package
SMC (DO-214AB) package: molded plastic body with matte tin-plated leads, MSL level 1 (260 °C reflow peak), polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to protected line's lower-potential side | Provides low forward voltage drop (VF = 3.5 V at 100 A) for load-dump suppression paths |
| Cathode | Current exit terminal during reverse avalanche; tied to system ground or return path | Acts as clamping node - voltage at cathode rises to VC during surge, limiting differential stress on downstream components |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20; supports green manufacturing and end-of-life compliance |
| 1500 W peak pulse power | Handles repeated 10/1000 µs transients at 0.01 % duty cycle without parameter shift or degradation |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) across lifetime and temperature extremes |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving protection margin |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load dump transients (up to 60 V, 100 ms) on 12 V/24 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground; responds within <1 ns to clamp overvoltage before downstream regulators or MCUs are stressed. Use Value: Enables compliance with ISO 16750-2 Pulse 5a (load dump) and extends system MTBF by preventing gate oxide rupture in MOSFET drivers and CAN transceivers. |
Use Scenario: Shields 4–20 mA current-loop or RS-485 transceivers from ESD and inductive switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line-to-ground; remains non-conductive below 43.6 V while clamping fast transients >50 V. Use Value: Maintains signal integrity with <1.0 µA leakage at 43.6 V and prevents false triggering or latch-up in analog front-ends and isolated data interfaces. |
| DC-DC Converter Input Protection | Telecom Power Supply Surge Suppression |
|
Use Scenario: Guards input stage of buck converters in telecom base station power supplies exposed to lightning-induced surges on -48 V DC feeds. IC Role / Device Role / Timing Role: Primary-level TVS in series with input filter; clamps 1500 W surges to 70.1 V to protect upstream rectifiers and primary-side controllers. Use Value: Reduces need for oversized input capacitors and eliminates secondary crowbar circuits - simplifies BOM and improves power density. |
Use Scenario: Installed on AC/DC adapter outputs powering VoIP phones and small cell radios, mitigating conducted surges from shared building wiring. IC Role / Device Role / Timing Role: Final-stage unidirectional clamp on regulated DC output; absorbs residual transients escaping primary-side MOVs and filters. Use Value: Achieves UL 497B recognition (QVGQ2 file E136766) and meets IEC 61000-4-5 Ed. 3 immunity requirements without additional isolation stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A | Same VBR range (48.5–53.6 V) but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients (IEC 61000-4-2 ±8 kV contact); unsuitable for load dump or high-current inductive switching | Select only for space-constrained consumer electronics where surge severity is classified ≤ Level 2 |
| 1.5KE51A | Same electrical specs but axial-leaded DO-201AD package; not surface-mountable; higher mounting inductance reduces high-frequency response | Requires through-hole assembly; incompatible with automated SMT lines; less suitable for high-speed transient suppression in dense PCB layouts | Choose only for legacy repair, prototyping, or low-volume designs where reflow compatibility is not required |
Compared with SMAJ51A and 1.5KE51A, the 1.5SMC51AHM3_A/I delivers superior surge handling (1500 W vs. 400 W/1500 W), SMT manufacturability, AEC-Q101 qualification, and halogen-free compliance - making it the preferred choice for production automotive and industrial systems requiring long-term supply stability and regulatory alignment.
Availability
1.5SMC51AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, and telecom DC power supply protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC51AHM3_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 diodes, rectifiers, TVS, and power MOSFETs for high-reliability applications.
The 1.5SMC Series was engineered specifically for automotive and industrial transient suppression - delivering AEC-Q101-qualified, high-power surface-mount TVS diodes with repeatable clamping and low leakage in harsh thermal environments.
FAQ
What is the clamping voltage of the 1.5SMC51AHM3_A/I under a 10/1000 µs surge?
The 1.5SMC51AHM3_A/I has a maximum clamping voltage (VC) of 70.1 V at 21.4 A peak pulse current (IPPM) under 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. The 1.5SMC51AHM3_A/I maintains this clamping performance across its rated junction temperature range.
Is the 1.5SMC51AHM3_A/I qualified for automotive use?
Yes, the 1.5SMC51AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_A" - indicating halogen-free, RoHS-compliant construction with full automotive reliability testing (including temperature cycling, HTRB, and ESD). It is approved for use in engine control units, body electronics, and ADAS subsystems where sustained operation from –65 °C to +150 °C is required. The 1.5SMC51AHM3_A/I meets these qualifications without derating.
What does the "HM3_A/I" suffix mean in 1.5SMC51AHM3_A/I?
The "HM3" denotes halogen-free and RoHS-compliant construction; "A" indicates AEC-Q101 qualification for the 6.8 V to 220 V voltage range; "I" specifies packaging in 13-inch tape-and-reel format (3500 units per reel). This full suffix confirms the 1.5SMC51AHM3_A/I meets automotive-grade material, reliability, and logistics requirements - distinguishing it from commercial-grade variants like "E3" or "M3" without AEC-Q101 validation.
How does the 1.5SMC51AHM3_A/I compare to bidirectional TVS diodes?
The 1.5SMC51AHM3_A/I is unidirectional and intended for DC line protection where polarity is fixed - such as positive power rails referenced to ground. Unlike bidirectional types (e.g., 1.5SMC51CA), it conducts only in reverse avalanche and forward conduction, offering lower leakage (<1.0 µA at VWM) and tighter VBR tolerance. The 1.5SMC51AHM3_A/I is not suitable for AC-coupled or floating signal lines where symmetrical clamping is needed.
What is the thermal resistance of the 1.5SMC51AHM3_A/I, and how does it affect layout?
The 1.5SMC51AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To achieve rated power dissipation, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal as specified in Vishay's datasheet (Doc. 88303). Reducing pad size increases RθJA, causing premature thermal shutdown during repetitive surges - a critical consideration for the 1.5SMC51AHM3_A/I in high-duty-cycle applications.
1.5SMC51AHM3_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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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)
1.5SMC51AHM3_A/I FAQ
1.How can I place an order for 1.5SMC51AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51AHM3_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 1.5SMC51AHM3_A/I reliable?
The price and inventory of 1.5SMC51AHM3_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 1.5SMC51AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC51AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51AHM3_A/I?
1.5SMC51AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51AHM3_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 1.5SMC51AHM3_A/I?
For technical support, including 1.5SMC51AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51AHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC51AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51AHM3_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 1.5SMC51AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC51AHM3_A/I?
All 1.5SMC51AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51AHM3_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 1.5SMC51AHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC51AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51AHM3_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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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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