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Vishay General Semiconductor - Diodes Division SMBJ51AHE3/52
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- Part No.:
- SMBJ51AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHE3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,645
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Product details
Overview
SMBJ51AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown range at 1 mA, 82.4 V clamping voltage at 7.3 A peak pulse current, and 600 W peak pulse power handling per 10/1000 µs waveform - deployed in automotive ECUs, industrial sensor interfaces, and telecom power supplies.
For engineers reviewing the SMBJ51AHE3/52 datasheet, SMBJ51AHE3/52 pinout, SMBJ51AHE3/52 application, or SMBJ51AHE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), 1.0 µA max reverse leakage at VWM, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to deliver fast response (<1 ps) and low incremental surge resistance. Its design targets transient suppression per IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) standards.
The SMBJ51AHE3/52 is rated for continuous operation from –55 °C to +150 °C junction temperature, with derating above 25 °C ambient. Its MSL Level 1 rating (JEDEC J-STD-020) and matte tin-plated leads ensure reliability in high-volume reflow assembly without solderability degradation.
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 systems. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - verified breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 82.4 V at 7.3 A - clamping voltage limits downstream IC stress during 600 W surges. |
| PPPM | 600 W - peak pulse power capability with 10/1000 µs waveform supports repetitive surge events at 0.01% duty cycle. |
| IFSM | 100 A - non-repetitive forward surge rating enables survival of 8.3 ms half-sine load-dump pulses. |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance allows effective heat dissipation into PCB copper pads. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48 V rail); band denotes cathode end per polarity marking. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without preconditioning; eliminates moisture-related popcorning risk. |
| 600 W peak pulse power | Provides headroom for ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 combination wave surges. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage overshoot during clamping, reducing stress on downstream MOSFETs and regulators. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump transients up to 60 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and bulk capacitor to limit voltage excursion. Use Value: Clamps to 82.4 V at 7.3 A, preventing damage to 100 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground to shunt transients before reaching ADC inputs. Use Value: 1.0 µA max leakage at 51 V ensures minimal impact on loop accuracy; fast response preserves signal integrity. |
| Telecom DC Power Input | Consumer Power Adapter Output |
|
Use Scenario: Safeguarding PoE-powered equipment inputs from lightning-induced surges on 57 V DC supply lines. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of hot-swap controller and filter stage. Use Value: 600 W rating handles IEC 61000-4-5 2 Ω/12 Ω combination wave surges; RθJL = 20 °C/W enables thermal stability under repeated events. |
Use Scenario: Overvoltage suppression on USB-C PD adapter secondary-side outputs (e.g., 20 V PPS rails). IC Role / Device Role / Timing Role: Secondary-side TVS placed after synchronous rectifier to protect connected devices from output overvoltage faults. Use Value: 51 V VWM provides 10 % margin above 45 V max PD profile; AEC-Q101 grade ensures production longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHM3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU automotive Tier 1 requirements). | Choose SMBJ51AHM3/52 when halogen-free bill-of-materials is required; otherwise SMBJ51AHE3/52 is preferred for cost-sensitive commercial designs. |
| SMCJ51AHE3/52 | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM and higher IPPM (12.3 A). | Used where higher surge energy absorption is needed (e.g., front-end AC/DC input stages), not for space-constrained PCBs. | Choose SMCJ51AHE3/52 only if 1500 W surge rating is required and board area permits SMC footprint; SMBJ51AHE3/52 remains optimal for compact 600 W protection. |
Compared with SMBJ51AHM3/52, the SMBJ51AHE3/52 offers identical protection performance with standard RoHS compliance but excludes halogen-free certification; compared with SMCJ51AHE3/52, it trades 2.5× surge capacity for 40 % smaller PCB area and lower thermal mass - critical for dense automotive module layouts.
Availability
SMBJ51AHE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, and telecom DC power input stages requiring stable component supply, AEC-Q101 traceability, and consistent SMT placement performance.
Supply support for SMBJ51AHE3/52 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 is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in harsh environments - including under-hood automotive, industrial automation, and infrastructure power systems.
FAQ
What is the clamping voltage of SMBJ51AHE3/52 at its rated peak pulse current?
The SMBJ51AHE3/52 has a maximum clamping voltage (VC) of 82.4 V at its specified peak pulse current (IPPM) of 7.3 A, measured using the standardized 10/1000 µs waveform. This value ensures protected circuits remain below critical overvoltage thresholds during surge events. The SMBJ51AHE3/52 maintains this clamping performance across its full operating temperature range and after multiple surge cycles.
Is SMBJ51AHE3/52 qualified for automotive applications?
Yes, SMBJ51AHE3/52 is AEC-Q101 qualified, meaning it has passed rigorous stress tests for temperature cycling, humidity, mechanical shock, and surge endurance required for automotive electronics. The "HE3" suffix explicitly denotes this qualification, making SMBJ51AHE3/52 suitable for use in engine control modules, body control units, and ADAS power domains where reliability under thermal and electrical stress is mandatory.
What does the "/52" suffix indicate in SMBJ51AHE3/52?
The "/52" suffix in SMBJ51AHE3/52 specifies the packaging format: 7-inch diameter plastic tape and reel containing 750 units. This is the standard delivery mode for high-volume SMT assembly. The "52" code is defined in Vishay's ordering information table and distinguishes it from alternate reels such as "/5B" (13-inch reel, 3200 units) or "/H" (7-inch reel with different carrier tape specification).
How does SMBJ51AHE3/52 differ from bidirectional TVS diodes like SMBJ51CA?
The SMBJ51AHE3/52 is unidirectional and functions as a polarity-sensitive clamp - conducting only during reverse overvoltage events - whereas SMBJ51CA is bidirectional and clamps in both directions. This makes SMBJ51AHE3/52 ideal for DC power rail protection where polarity is fixed, offering lower leakage and tighter VBR tolerance. SMBJ51AHE3/52 cannot replace SMBJ51CA in AC-coupled or floating signal line applications without circuit redesign.
What is the thermal resistance from junction to lead (RθJL) for SMBJ51AHE3/52?
The SMBJ51AHE3/52 has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, as specified in Vishay's thermal characteristics table. This low value enables efficient heat transfer from the silicon die to the PCB copper pads via the leads, supporting reliable operation at elevated ambient temperatures and during repetitive surge events. This parameter is critical for validating thermal performance in compact automotive and industrial layouts.
SMBJ51AHE3/52 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ51AHE3/52 FAQ
1.How can I place an order for SMBJ51AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHE3/52 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 SMBJ51AHE3/52 reliable?
The price and inventory of SMBJ51AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHE3/52?
SMBJ51AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHE3/52 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 SMBJ51AHE3/52?
For technical support, including SMBJ51AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHE3/52 requirements.
6.How does Aetrix verify that SMBJ51AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHE3/52 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 SMBJ51AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51AHE3/52?
All SMBJ51AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHE3/52, 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 SMBJ51AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ51AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHE3/52 Tags
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