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Vishay General Semiconductor - Diodes Division SMCJ51AHE3_A/I
- Part No.:
- SMCJ51AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHE3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,868
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Product details
Overview
SMCJ51AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown range (VBR at 1 mA), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform). It is used to protect MOSFETs, microcontrollers, and sensor interfaces against ESD and inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SMCJ51AHE3_A/I datasheet, SMCJ51AHE3_A/I pinout, SMCJ51AHE3_A/I application, or SMCJ51AHE3_A/I equivalent, this device is selected for high-energy surge immunity in AEC-Q101-qualified automotive subsystems, where low clamping voltage, fast response (<1 ns), and stable thermal performance up to +150 °C junction temperature are critical design requirements.
Technical Context
The SMCJ51AHE3_A/I operates as a silicon avalanche diode with glass-passivated junction, enabling precise breakdown behavior and repeatable clamping under repetitive surge events. Its unidirectional polarity-marked by a cathode band-defines forward conduction path and reverse-biased protection mode during overvoltage conditions.
Designed for surface-mount assembly on SMC (DO-214AB) footprint, it delivers 1500 W surge handling per IEC 61000-4-5 (10/1000 µs) with 0.057 %/°C VBR temperature coefficient and 75 °C/W junction-to-ambient thermal resistance when mounted on 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V automotive systems. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on without premature conduction. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage during full-rated 1500 W surge; determines protected IC's maximum stress level. |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy absorption capacity; meets IEC 61000-4-5 Level 4 immunity requirements. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.11 mm × 6.22 mm body and 2.62 mm height; compatible with automated pick-and-place. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected circuit return / ground reference | Connected to system ground; reverse-biased during surge to clamp positive transients on anode-connected line. |
| Anode | Line-side connection to protected node | Attached to power rail or signal line requiring overvoltage suppression; conducts surge current to cathode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe load-dump and ISO 7637-2 Pulse 5a transients in 12 V/24 V automotive systems. |
| 82.4 V clamping voltage at 18.2 A | Limits voltage overshoot across downstream ICs to safe levels during 10/1000 µs surges, reducing risk of latch-up or gate oxide damage. |
| AEC-Q101 qualification (HE3 suffix) | Confirms long-term reliability under automotive thermal, mechanical, and lifetime stress conditions-no additional qualification needed for Tier 1 programs. |
| Low 0.057 %/°C VBR tempco | Ensures stable clamping threshold across -55 °C to +150 °C ambient, critical for engine control unit (ECU) and ADAS module designs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT line integration and reducing manufacturing cost. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery management system (BMS) supply inputs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive surges above 51 V while remaining non-conductive during normal operation. Use Value: Limits peak rail voltage to ≤82.4 V during 1500 W surges, preventing damage to buck converters and CAN transceivers downstream. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC I/O modules from field-wiring induced transients. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to absorb fast-rising ESD and inductive kickback pulses. Use Value: Sub-1 ns response time and 1.0 µA leakage at 51 V preserve signal integrity and minimize offset error in precision 4–20 mA loops. |
| Motor Drive Gate Driver Protection | Telecom DC Power Input Protection |
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in BLDC inverters from shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: TVS installed between gate driver output and source terminal to clamp negative-going transients during fast switching transitions. Use Value: Low incremental surge resistance ensures minimal voltage overshoot during 100 ns–1 µs spikes, preserving gate oxide integrity. |
Use Scenario: Securing primary 48 V DC input of PoE-powered network switches against lightning-induced surges on building wiring. IC Role / Device Role / Timing Role: First-stage unidirectional suppressor upstream of DC-DC converter, absorbing bulk surge energy before secondary TVS or MOV stages. Use Value: 1500 W rating and DO-214AB thermal mass enable sustained surge handling without thermal runaway in enclosed telecom enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHE3_A/I | Lower PPPM (600 W), same VWM/VBR/VC, SMB (DO-214AA) package (smaller footprint, higher RθJA). | Suitable for space-constrained consumer electronics with lower surge exposure; not rated for automotive load dump. | Select when board area is limited and surge threat level is IEC 61000-4-2/4-4 only-not for ISO 7637-2 or load dump. |
| SMCJ51CAHE3_A/I | Bidirectional variant; identical VWM/VBR/VC ratings but symmetric clamping in both polarities; same package and AEC-Q101 qualification. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs) where negative transients occur. | Choose for bidirectional protection needs; otherwise, unidirectional SMCJ51AHE3_A/I offers lower leakage and simpler grounding. |
Compared with SMBJ51AHE3_A/I, the SMCJ51AHE3_A/I provides 2.5× higher surge power handling and better thermal dissipation for automotive-grade durability; compared with SMCJ51CAHE3_A/I, it offers lower reverse leakage and simplified layout in DC-biased applications where only positive transients require suppression.
Availability
SMCJ51AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom power supplies, and sensor interface modules requiring stable component supply with AEC-Q101 assurance and long-lifecycle support.
Supply support for SMCJ51AHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh-environment applications including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What is the clamping voltage of the SMCJ51AHE3_A/I under full-rated surge current?
The SMCJ51AHE3_A/I has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 18.2 A (10/1000 µs waveform). This value is measured per JEDEC standards and guarantees that downstream components experience no more than 82.4 V during worst-case surge events. The SMCJ51AHE3_A/I maintains this clamping performance across its qualified temperature range of -55 °C to +150 °C.
Is the SMCJ51AHE3_A/I suitable for automotive applications?
Yes, the SMCJ51AHE3_A/I carries the HE3 suffix, indicating full AEC-Q101 qualification for automotive use. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC standards. The SMCJ51AHE3_A/I is routinely deployed in engine control units, body control modules, and ADAS power domains where ISO 7637-2 Pulse 5a and IEC 61000-4-5 compliance are mandatory.
How does the SMCJ51AHE3_A/I differ from the bidirectional SMCJ51CAHE3_A/I?
The SMCJ51AHE3_A/I is unidirectional, with a cathode band marking and asymmetric conduction-conducting only in reverse breakdown to clamp positive transients. The SMCJ51CAHE3_A/I is bidirectional, offering symmetrical clamping for both polarities, making it appropriate for AC or differential signals. Both share identical VWM (51 V), VBR (56.7–62.7 V), VC (82.4 V), and AEC-Q101 qualification-but the SMCJ51AHE3_A/I exhibits lower reverse leakage (1.0 µA vs. 2.0 µA for CA version at VWM).
What is the thermal resistance of the SMCJ51AHE3_A/I in standard mounting conditions?
The SMCJ51AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Its junction-to-lead resistance (RθJL) is 15 °C/W, supporting effective heat transfer to PCB planes. These values are validated per JESD51-7 and ensure the SMCJ51AHE3_A/I remains within its +150 °C maximum junction temperature limit during repetitive surge duty cycles.
Does the SMCJ51AHE3_A/I require a heatsink for standard operation?
No external heatsink is required for the SMCJ51AHE3_A/I under typical single-pulse or low-duty-cycle surge conditions. Its SMC (DO-214AB) package and optimized thermal pad layout enable sufficient self-cooling. However, for high-frequency surge repetition (>1 Hz) or elevated ambient temperatures (>85 °C), derating per Figure 2 of the datasheet is necessary. The SMCJ51AHE3_A/I's RθJA of 75 °C/W assumes standard JEDEC test board conditions-designers should verify thermal margin using actual PCB copper area and airflow.
SMCJ51AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ51AHE3_A/I FAQ
1.How can I place an order for SMCJ51AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHE3_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 SMCJ51AHE3_A/I reliable?
The price and inventory of SMCJ51AHE3_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 SMCJ51AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ51AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHE3_A/I?
SMCJ51AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHE3_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 SMCJ51AHE3_A/I?
For technical support, including SMCJ51AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ51AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHE3_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 SMCJ51AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ51AHE3_A/I?
All SMCJ51AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHE3_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 SMCJ51AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ51AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHE3_A/I Tags
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