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Vishay General Semiconductor - Diodes Division SMBJ51AHE3_B/H
- Part No.:
- SMBJ51AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHE3_B/H.pdf
- Description:
- 600W,51V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
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Product details
Overview
SMBJ51AHE3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMBJ51AHE3_B/H datasheet, SMBJ51AHE3_B/H pinout, SMBJ51AHE3_B/H application, or SMBJ51AHE3_B/H equivalent, this device is evaluated for ESD and surge immunity in 12 V/24 V DC systems, PCB-level lightning transient suppression per IEC 61000-4-5, reverse polarity protection interface design, and AEC-Q101-compliant automotive subsystem hardening.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 µA leakage at 51 V), then rapidly avalanches below 62.7 V to clamp transients within nanoseconds. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low temperature coefficient (0.104 %/°C), enabling predictable performance across -55 °C to +150 °C junction range.
Designed for automated SMT assembly, SMBJ51AHE3_B/H meets J-STD-020 MSL Level 1, supports 260 °C lead-free reflow, and delivers 100 A non-repetitive forward surge capability (8.3 ms half-sine). Its 20 °C/W junction-to-lead thermal resistance enables effective heat dissipation when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 48 V nominal systems. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - Tight 5% tolerance ensures consistent turn-on threshold across production lots and temperature. |
| VC (Clamping Voltage) | 82.4 V at 7.3 A (10/1000 µs) - Limits downstream IC stress during 600 W transient events; <20% overshoot above VWM. |
| PPPM (Peak Pulse Power) | 600 W - Sustains standardized lightning/surge pulses without degradation; validated per IEC 61000-4-5 Level 3/4. |
| IPPM (Peak Pulse Current) | 7.3 A - Peak current handled at VC; correlates directly to system-level surge test compliance (e.g., ISO 7637-2 Pulse 1/2b). |
| TJmax | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic control units per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 12 V supply rail); conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground plane; completes clamping path with minimal inductance for sub-ns response. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 4 kV surge tests on 50 Ω source impedance without derating. |
| 0.104 %/°C VBR tempco | Ensures <±3% VBR shift over full -55 °C to +150 °C range - critical for stable clamping in engine bay or factory-floor environments. |
| Glass passivated junction | Provides long-term reliability and low parameter drift under thermal cycling and humidity exposure per JESD22-A101. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT processes without pre-baking or special handling - reduces manufacturing cost and risk. |
| AEC-Q101 qualified (HE3 suffix) | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-defect field performance. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 12 V CAN/LIN bus power rails from load dump and alternator ripple transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional shunt clamping device placed between fused 12 V supply and local LDO regulator input. Use Value: Clamps 120 V/100 ms load dump spikes to ≤82.4 V, preventing LDO overvoltage failure and ensuring uninterrupted microcontroller operation. |
Use Scenario: Safeguarding 24 V digital input channels against induced surges from nearby contactor switching in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor on each optocoupler input leg, upstream of series current-limiting resistor. Use Value: Limits transient energy entering optocoupler LED to <10 mJ, preserving isolation barrier integrity and extending channel lifetime beyond 10⁶ operations. |
| Telecom Remote Radio Unit (RRU) | Consumer Smart Home Gateway |
|
Use Scenario: Shielding 48 V PoE-powered RF front-end circuitry from lightning-induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary DC rail protector located immediately after PoE PD controller, before DC-DC conversion stages. Use Value: Absorbs 600 W IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) without latch-up, maintaining RF signal integrity during storm events. |
Use Scenario: Securing USB-C power delivery lines in smart speaker hubs against ESD events (>8 kV contact discharge) and hot-plug transients. IC Role / Device Role / Timing Role: Secondary-level TVS placed between USB-C CC logic and Type-C port VBUS line, downstream of primary fuse. Use Value: Responds in <1 ns to divert >15 A ESD current, limiting VBUS overshoot to <60 V and preventing USB-PD controller latch-up or reset. |
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_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy (e.g., VW TL 813). | Direct drop-in replacement when halogen-free content is required; no layout or validation changes needed. |
| SAC51A-TB | Same VWM/VC ratings but in smaller SOD-123FL package; lower PPPM (400 W), higher RθJA (150 °C/W), not AEC-Q101 qualified. | Limited to space-constrained consumer or non-automotive industrial designs where 600 W surge immunity is not required. | Use only for cost-sensitive, low-energy transient environments; not suitable for automotive or industrial 4 kV surge testing. |
Compared with SMBJ51AHE3_B/H, SMBJ51AHM3_B/H offers identical protection performance with halogen-free construction, while SAC51A-TB trades surge robustness and automotive qualification for footprint reduction - making the HE3 variant optimal for high-reliability 12–48 V DC systems demanding AEC-Q101 and 600 W immunity.
Availability
SMBJ51AHE3_B/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom remote radio units requiring stable component supply with AEC-Q101 traceability and 600 W surge resilience.
Supply support for SMBJ51AHE3_B/H 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, and passive components for automotive, industrial, and computing markets.
The SMBJ series is engineered for rugged transient suppression in harsh environments, targeting automotive power distribution, industrial I/O protection, and telecom infrastructure where repeatable clamping and long-term stability are mission-critical.
FAQ
What is the clamping voltage of SMBJ51AHE3_B/H at its rated peak pulse current?
The SMBJ51AHE3_B/H has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry sees no more than 82.4 V during a 600 W transient event - a key parameter for validating protection margins in 48 V DC systems. The SMBJ51AHE3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ51AHE3_B/H suitable for automotive applications?
Yes, SMBJ51AHE3_B/H is AEC-Q101 qualified and specifically designed for automotive use. Its HE3 suffix denotes RoHS-compliant construction with full AEC-Q101 stress testing - including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD. It is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces where load dump and jump-start transients must be reliably suppressed. The SMBJ51AHE3_B/H meets all requirements for under-hood and cabin-mounted ECUs.
How does the SMBJ51AHE3_B/H differ from bidirectional TVS diodes like SMBJ51CA?
The SMBJ51AHE3_B/H is unidirectional and functions only in reverse-bias avalanche mode, making it ideal for DC power rail protection where polarity is fixed. In contrast, SMBJ51CA is bidirectional and clamps in both directions - suited for AC signal lines or differential buses like RS-485. The SMBJ51AHE3_B/H exhibits lower leakage (<1 µA at 51 V) and higher surge current capability in its intended direction, while SMBJ51CA has symmetrical VBR and double the ID limit for low-VWM variants. For 12 V/24 V/48 V DC systems, SMBJ51AHE3_B/H is the preferred choice.
What is the thermal resistance and recommended PCB layout for SMBJ51AHE3_B/H?
The SMBJ51AHE3_B/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To ensure reliable 600 W pulse handling, use minimum 1 oz. copper with thermal vias under each pad connected to internal ground/power planes. Avoid narrow traces between the SMBJ51AHE3_B/H and ground return - keep paths short and wide to minimize inductance and preserve sub-ns response time.
Does SMBJ51AHE3_B/H require external current limiting or series impedance?
No, SMBJ51AHE3_B/H operates as a self-limiting shunt device and does not require external series resistors or current-limiting components for basic transient suppression. Its dynamic resistance drops sharply during avalanche, allowing it to absorb full 600 W pulses without external aid. However, in high-repetition-rate surge environments (e.g., frequent motor commutation), a small series ferrite bead or polyfuse may be added to reduce duty-cycle heating - but this is not needed for standard IEC 61000-4-5 or ISO 7637-2 compliance testing. The SMBJ51AHE3_B/H is designed for direct placement across protected nodes.
SMBJ51AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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):
- 7.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ51AHE3_B/H FAQ
1.How can I place an order for SMBJ51AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHE3_B/H 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_B/H reliable?
The price and inventory of SMBJ51AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51AHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ51AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHE3_B/H?
SMBJ51AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHE3_B/H 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_B/H?
For technical support, including SMBJ51AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHE3_B/H requirements.
6.How does Aetrix verify that SMBJ51AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHE3_B/H 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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ51AHE3_B/H?
All SMBJ51AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHE3_B/H, 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_B/H part is unused and in its original packaging.
Return procedure for SMBJ51AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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