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Taiwan Semiconductor Corporation SMBJ51H
- Part No.:
- SMBJ51H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51H.pdf
- Description:
- 600W, 63V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,378
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Product details
Overview
SMBJ51H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 51V working stand-off voltage (VWM), and 91.1V maximum clamping voltage (VC) at 6.9A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ51H datasheet, SMBJ51H pinout, SMBJ51H application, or SMBJ51H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 55°C/W), clamping performance under 10/1000µs waveform, and bidirectional variant options for system-level ESD and load-dump protection design.
Technical Context
The SMBJ51H employs a glass-passivated silicon junction optimized for fast response (<1.0 ps) and low leakage (<1 µA at 51 V), with breakdown voltage specified at 56.7–69.3 V (IT = 1 mA). Its unidirectional configuration features a cathode band marking and supports surge immunity per ISO 7637-2 without derating up to 125°C ambient.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation in high-density PCB layouts. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for automotive-grade assembly processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 48V automotive systems. |
| VBR min/max | 56.7 V / 69.3 V @ IT = 1 mA - Confirmed breakdown range ensures robust turn-on threshold across temperature and process variation. |
| VC @ IPP | 91.1 V @ 6.9 A (10/1000 µs) - Clamping voltage limits downstream IC stress during load dump; enables compliance with ISO 16750-2 Level IV. |
| PPK | 600 W - Peak pulse power rating determines survivability against standardized automotive transients (e.g., ISO 7637-2 Pulse 5a). |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery drain budget in always-on vehicle modules (e.g., CAN wake-up circuits). |
| TJ max | +150 °C - Junction temperature limit supports under-hood deployment in engine control units and ADAS power supplies. |
| RθJA | 55 °C/W - Thermal resistance value used to calculate junction temperature rise in real-world board layouts with standard 1 oz copper. |
Pinout & Package
DO-214AA (SMB) surface-mount package with matte tin-plated leads, polarity indicated by cathode band on unidirectional variants. Weight: 0.090 g. Moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 48V supply rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling - enables use in safety-critical ECUs. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives; critical for under-hood longevity. |
| Fast response time <1.0 ps | Clamps transients before sensitive logic or analog circuitry sustains damage - essential for protecting CAN FD or LIN bus interfaces. |
| ISO 7637-2 compliant | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (board-level EFT) - covers full automotive EMC profile. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - satisfies Tier 1 supplier material declarations and export requirements. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 48V battery-fed ADAS domain controllers from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and DC-DC converter input stage to clamp transients before regulation. Use Value: Limits clamped voltage to 91.1 V, ensuring downstream 100V-rated MOSFETs and gate drivers remain within SOA during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 24V digital input channels of programmable logic controllers against field-wiring induced transients. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid coils. Use Value: Sub-1 µA leakage avoids false triggering of optocoupled inputs; 600W rating handles repetitive 2 kV/100 kHz burst sequences. |
| LED Driver Overvoltage Clamp | USB-C Port ESD Suppression |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers in automotive lighting due to alternator overshoot. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp voltage spikes exceeding forward voltage of high-power LED strings. Use Value: 91.1 V clamping ensures LED string remains below 100 V absolute maximum rating while maintaining >6.9 A surge current capability per pulse. |
Use Scenario: Adding secondary-level ESD protection on USB-C VBUS lines in infotainment head units exposed to hot-plug events. IC Role / Device Role / Timing Role: Secondary TVS after primary common-mode choke to absorb residual 8 kV contact discharge energy not filtered upstream. Use Value: 1.0 ps response captures fast-rising ESD pulses; DO-214AA footprint allows placement adjacent to connector without trace length penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ51A | Same DO-214AC (SMA) package; lower PPK (400 W); VBR = 56.7–62.7 V; VC = 85.0 V @ 4.7 A. | Lower clamping energy handling; suitable only for non-load-dump scenarios (e.g., ESD-only zones). | Select when space-constrained layouts require smaller SMA footprint and system transients are limited to IEC 61000-4-2/4-5. |
| ON Semiconductor SMCJ51A | DO-214AB (SMC) package; higher PPK (1500 W); VBR = 56.7–62.7 V; VC = 87.1 V @ 17.2 A. | Higher thermal mass and surge capacity; requires larger pad layout and heatsinking for sustained duty cycles. | Choose for heavy-duty industrial motor drives where repetitive 1500 W surges occur, accepting 3× PCB area increase vs. SMBJ51H. |
Compared with SMAJ51A and SMCJ51A, SMBJ51H delivers optimal balance of 600W surge capacity, DO-214AA compactness, and AEC-Q101 validation - making it the preferred choice for space-limited automotive modules requiring certified load-dump immunity without over-engineering.
Availability
SMBJ51H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply across multi-year production programs.
Supply support for SMBJ51H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V/48V automotive subsystems and ruggedized industrial controls - emphasizing reliability, fast response, and standardized ISO 7637-2 immunity.
FAQ
What is the clamping voltage of SMBJ51H under standard 10/1000 µs surge conditions?
The SMBJ51H has a maximum clamping voltage (VC) of 91.1 V when subjected to a 10/1000 µs waveform at 6.9 A peak impulse current (IPP), as specified in the official Taiwan Semiconductor datasheet revision A2102. This value ensures protected circuits remain within safe voltage margins during automotive load dump events. The SMBJ51H maintains this clamping performance across its full operating temperature range (-55°C to +150°C).
Is SMBJ51H suitable for bidirectional transient protection?
No - SMBJ51H is a unidirectional TVS diode, indicated by its "H" suffix and cathode band marking. For bidirectional protection, Taiwan Semiconductor offers the SMBJ51AH variant (with "AH" suffix), which provides symmetrical clamping in both polarities and is explicitly rated for bipolar applications per datasheet Section "Devices for Bipolar Applications". Using SMBJ51H in bidirectional configurations risks forward conduction and failure.
Does SMBJ51H meet AEC-Q101 qualification requirements?
Yes - the SMBJ51H is explicitly listed as AEC-Q101 qualified in the Taiwan Semiconductor datasheet (Version A2102, Page 1). It has undergone stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling, and mechanical shock - validating its suitability for automotive electronic control units, body electronics, and ADAS subsystems.
What is the maximum leakage current of SMBJ51H at its working stand-off voltage?
The SMBJ51H exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 51 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage is critical for battery-powered automotive modules such as telematics units or always-on CAN nodes, where cumulative leakage across multiple protection devices must remain below microampere thresholds to avoid excessive quiescent drain.
Can SMBJ51H be used in place of SMBJ51AH in a circuit originally designed for bidirectional protection?
No - substituting SMBJ51H for SMBJ51AH compromises protection integrity. SMBJ51H conducts forward current above ~3.5 V in the reverse direction (per VF specification), potentially shorting protected lines during negative transients. The SMBJ51AH uses a dual-die configuration to provide matched clamping in both directions. Replacing it with SMBJ51H requires redesigning the protection topology and verifying system-level immunity to bipolar surges using ISO 7637-2 Pulse 1 and 2b waveforms.
SMBJ51H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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 (SMB)
SMBJ51H FAQ
1.How can I place an order for SMBJ51H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51H 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 SMBJ51H reliable?
The price and inventory of SMBJ51H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51H is usually 5 days.
3.What payment methods are accepted for SMBJ51H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51H?
SMBJ51H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51H 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 SMBJ51H?
For technical support, including SMBJ51H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51H requirements.
6.How does Aetrix verify that SMBJ51H is sourced from the original manufacturer or authorized distributors?
All SMBJ51H 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 SMBJ51H meets industry standards.
7.What is the process for return or replacement of SMBJ51H?
All SMBJ51H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51H, 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 SMBJ51H part is unused and in its original packaging.
Return procedure for SMBJ51H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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