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Vishay General Semiconductor - Diodes Division SMBJ51CAHE3/52
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- Part No.:
- SMBJ51CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHE3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,130
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Product details
Overview
SMBJ51CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 51 V stand-off voltage (VWM), 600 W peak pulse power (10/1000 µs), and clamps to ≤82.4 V at 7.3 A peak pulse current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ51CAHE3/52 datasheet, SMBJ51CAHE3/52 pinout, SMBJ51CAHE3/52 application, or SMBJ51CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B for surge protector classification.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, leveraging an avalanche breakdown mechanism across both polarities. Its bidirectional symmetry ensures identical VBR (min 56.7 V, max 62.7 V at 1 mA) and clamping behavior in either direction, with low incremental surge resistance enabling stable voltage limiting under fast-rising surges (e.g., IEC 61000-4-5).
The SMBJ51CAHE3/52 is rated for repetitive 10/1000 µs waveform pulses at 0.01% duty cycle and supports operating junction temperatures from –55 °C to +150 °C. Its glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - guaranteed breakdown onset range; ensures predictable turn-on during overvoltage events |
| VC @ IPPM | ≤82.4 V at 7.3 A - clamped voltage under 600 W 10/1000 µs surge; determines protected circuit's maximum stress level |
| PPPM | 600 W - peak pulse power handling capacity; validates robustness against lightning-induced or inductive-switching transients |
| IPPM | 7.3 A - peak pulse current corresponding to 600 W rating; used to size PCB trace width and layout for surge path |
| TJ max | +150 °C - maximum junction temperature; enables operation in high-ambient environments like automotive engine bays |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), with 1.52 mm lead spacing and matte tin-plated terminals solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Conducts during negative-going surges; forms symmetrical clamping path with cathode |
| Cathode | Transient current entry (positive polarity event) | Conducts during positive-going surges; paired with anode for full bidirectional protection |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions - eliminates need for polarity-aware placement in AC or differential lines |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD - suitable for under-hood and infotainment systems |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without degradation - protects downstream ICs like RS-485 transceivers |
| UL 497B recognized | Underwriters Laboratories certified for surge protector classification (QVGQ2, E136766) - meets safety agency requirements for telecom infrastructure |
| MSL Level 1 | Moisture sensitivity level 1 per J-STD-020 - allows unlimited floor life and reflow at 260 °C peak without baking |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation PLC modules from inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and ground, absorbing ±1 kV EFT bursts without affecting 4–20 mA loop accuracy. Use Value: Prevents sensor output saturation or ADC offset shift during 10/1000 µs transients, maintaining measurement integrity per IEC 61000-4-4. |
Use Scenario: Shielding RS-485 data lines in base station remote radio units exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Differential-line TVS pair (one per line) referenced to common ground, clamping common-mode transients before receiver input stage. Use Value: Limits voltage excursion to <82.4 V during 4 kV IEC 61000-4-5 surges, preventing damage to isolated RS-485 transceivers such as ADM2483. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding LIN bus communication lines in door module ECUs subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS mounted at connector entry point, shunting energy away from LIN transceiver (e.g., TLE6250) during ISO 7637-2 Pulse 5a events. Use Value: Maintains LIN bus functionality after repeated 100 V/50 ms load dump exposure due to AEC-Q101 qualification and 150 °C TJ rating. |
Use Scenario: Suppressing commutation spikes on microcontroller GPIO lines driving small brushed DC motors in smart home vacuum cleaners. IC Role / Device Role / Timing Role: Local TVS at motor driver output node, clamping flyback voltage before it couples into MCU I/O pins or power rails. Use Value: Eliminates need for external snubbers by absorbing 600 W spikes within 1 ns response time, reducing BOM count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA-M3/52 | Same electrical specs and AEC-Q101 qualification; halogen-free molding compound vs. HE3's standard RoHS-compliant compound | No functional difference in surge suppression; selected when halogen-free compliance is mandated by OEM environmental policy | Choose SMBJ51CA-M3/52 if halogen-free material requirement applies; otherwise SMBJ51CAHE3/52 offers identical protection performance |
| SMAJ51CA-E3/52 | Lower 400 W PPPM, higher RθJA (150 °C/W), same VWM/VC; SMA package (smaller footprint, lower surge rating) | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD); not recommended for IEC 61000-4-5 or lightning-level threats | Select SMAJ51CA-E3/52 only where space constraints prohibit SMB and surge threat level is limited to ESD or low-energy switching noise |
Compared with SMBJ51CA-M3/52, the SMBJ51CAHE3/52 provides identical surge protection but uses non-halogen-free packaging; versus SMAJ51CA-E3/52, it delivers 50% higher pulse power handling and superior thermal dissipation - critical for industrial and automotive surge immunity.
Availability
SMBJ51CAHE3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance motor drives requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ51CAHE3/52 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific performance.
The SMBJ series targets high-energy transient suppression in harsh environments; SMBJ51CAHE3/52 specifically addresses bidirectional surge protection needs in automotive, industrial, and telecom infrastructure where AEC-Q101 and UL recognition are mandatory.
FAQ
What is the clamping voltage of SMBJ51CAHE3/52 at its rated peak pulse current?
The SMBJ51CAHE3/52 clamps to a maximum of 82.4 V at its specified peak pulse current of 7.3 A (10/1000 µs waveform). This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The SMBJ51CAHE3/52 maintains this clamping performance symmetrically in both directions due to its bidirectional construction.
Is SMBJ51CAHE3/52 suitable for automotive applications?
Yes, SMBJ51CAHE3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and body control module environments. Its operating junction temperature range of –55 °C to +150 °C, combined with validation for temperature cycling, highly accelerated life testing, and ESD robustness, confirms suitability for automotive-grade designs. The SMBJ51CAHE3/52 meets ISO 7637-2 Pulse 5a load dump immunity requirements when properly implemented with appropriate PCB layout.
How does the bidirectional nature of SMBJ51CAHE3/52 affect its placement on the PCB?
The SMBJ51CAHE3/52 has no polarity marking and conducts identically in both directions, so it can be placed without orientation constraints - unlike unidirectional TVS diodes that require cathode alignment. This simplifies automated assembly and eliminates risk of misplacement on AC-coupled or differential signal lines. The SMBJ51CAHE3/52 is typically mounted between the protected line and ground, with equal effectiveness regardless of terminal orientation.
What is the thermal resistance of SMBJ51CAHE3/52, and how does it impact layout design?
The SMBJ51CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value directly affects power derating: at 85 °C ambient, the device must be derated to ~3.2 W continuous dissipation. Layout must provide adequate copper area and avoid thermal isolation; the SMBJ51CAHE3/52 benefits from internal thermal vias and shared ground planes to maintain safe junction temperatures during repetitive surge events.
Does SMBJ51CAHE3/52 meet any safety agency certifications?
Yes, SMBJ51CAHE3/52 is Underwriters Laboratories (UL) recognized under standard UL 497B for surge protectors (file E136766), covering both unidirectional and bidirectional configurations. This certification validates its performance and construction for use in telecom, industrial, and building infrastructure applications where third-party safety approval is required. The SMBJ51CAHE3/52 also complies with RoHS Directive 2011/65/EU and meets J-STD-020 MSL Level 1 for moisture sensitivity.
SMBJ51CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ51CAHE3/52 FAQ
1.How can I place an order for SMBJ51CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHE3/52 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 SMBJ51CAHE3/52 reliable?
The price and inventory of SMBJ51CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHE3/52?
SMBJ51CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHE3/52 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 SMBJ51CAHE3/52?
For technical support, including SMBJ51CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ51CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHE3/52 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 SMBJ51CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHE3/52?
All SMBJ51CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHE3/52, 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 SMBJ51CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ51CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHE3/52 Tags
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