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Taiwan Semiconductor Corporation SMBJ5.0A
- Part No.:
- SMBJ5.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ5.0A.pdf
- Description:
- TVS DIODE 5VWM 9.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,233
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Product details
Overview
SMBJ5.0A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.0 V breakdown voltage (VBR), 9.2 V maximum clamping voltage (VC) at 800 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ5.0A datasheet, SMBJ5.0A pinout, SMBJ5.0A application, or SMBJ5.0A equivalent, key selection considerations include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤5.0 µA at VWM, DO-214AA (SMB) package compatibility, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMBJ5.0A operates as a silicon avalanche diode optimized for fast transient suppression in automotive and industrial electronics. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its thermal resistance (RθJA = 55 °C/W) supports operation up to 150 °C junction temperature under pulsed conditions.
It delivers 9.2 V clamping at 800 A (10/1000 µs waveform), with forward voltage of 3.5 V at 50 A for unidirectional conduction - critical for minimizing voltage overshoot during load dump or inductive switching events in 5 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold for 5 V rail protection. |
| VBR min/max | 6.4 V / 7.0 V @ 10 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction during normal operation. |
| VC @ IPP | 9.2 V @ 800 A - Clamped voltage during worst-case 10/1000 µs surge; limits downstream IC stress to safe levels in automotive ECUs. |
| PPK | 600 W - Peak pulse power handling per single transient; meets ISO 7637-2 Pulse 5a (load dump) energy requirements. |
| ID @ VWM | ≤5.0 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss and avoids false triggers in low-power sensor interfaces. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive environments without derating. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Case molded to UL 94V-0 flammability standard; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; forms clamping loop with cathode to shunt transients away from protected circuitry. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 5 V supply); polarity band identifies this terminal - incorrect orientation disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events before sensitive CMOS inputs are damaged. |
| Glass passivated junction | Stable VBR tolerance and low IR drift across temperature and lifetime - critical for long-term reliability in automotive modules. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (switching transients) - covers full automotive EMC immunity scope. |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 5 V CAN transceiver power rail against load dump and jump-start surges in vehicle BCMs. IC Role / Device Role: Unidirectional TVS clamp on VCC line upstream of LDO regulator. Use Value: Limits clamped voltage to 9.2 V during 800 A transients, preventing regulator overvoltage shutdown and preserving CAN communication integrity. | Use Scenario: Safeguarding 5 V optocoupler input stage in programmable logic controller digital I/O modules exposed to field wiring transients. IC Role / Device Role: Primary surge shunt on isolated 5 V input supply before signal conditioning circuitry. Use Value: With ≤5.0 µA leakage at 5.0 V, it avoids loading the high-impedance input while clamping 10/1000 µs surges to safe levels for downstream logic. |
| LED Driver Power Supply Input | USB-C Port VBUS Line Protection |
Use Scenario: Suppressing inductive switching spikes from relay coils driving LED arrays in commercial lighting systems. IC Role / Device Role: Parallel-connected TVS across 5 V driver IC supply pins. Use Value: 600 W peak power rating absorbs repetitive 100 ns–1 µs spikes without degradation; RθJA = 55 °C/W enables thermal stability in enclosed fixtures. | Use Scenario: Providing secondary overvoltage protection on USB-C VBUS line after primary buck converter, guarding against adapter fault conditions. IC Role / Device Role: Unidirectional clamp referenced to ground on 5 V VBUS path. Use Value: Cathode-band polarity ensures correct orientation in compact layout; DO-214AA footprint fits tight board spacing near USB-C connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0 | Higher VC = 9.6 V at 800 A; wider VBR range (6.4–7.3 V) vs. SMBJ5.0A's tighter 6.4–7.0 V. | Less precise clamping margin for 5 V systems requiring strict <9.5 V overshoot control. | Select SMBJ5.0A when tighter VBR tolerance and lower clamping voltage are required for robust 5 V rail protection. |
| SAC5.0 | Same VWM (5.0 V) but lower PPK (400 W); higher VC = 12.5 V at 30 A (10/1000 µs). | Not suitable for high-current ISO 7637-2 Pulse 5a events; limited to lower-energy ESD and EFT scenarios. | Choose SMBJ5.0A over SAC5.0 where 600 W surge capability and 9.2 V clamping are mandatory for automotive-grade immunity. |
Compared with SMBJ5.0 and SAC5.0, the SMBJ5.0A offers the lowest clamping voltage (9.2 V) within the SMBJ family and exceeds SAC5.0's power rating by 50%, making it the optimal choice for demanding 5 V system protection where both precision and energy absorption are critical.
Availability
SMBJ5.0A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power supplies, and USB-C peripheral protection requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMBJ5.0A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing low clamping voltage, tight VBR tolerance, and robust package construction for automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ5.0A under standard test conditions?
The SMBJ5.0A has a maximum clamping voltage (VC) of 9.2 V when subjected to an 800 A peak impulse current with a 10/1000 µs waveform at TA = 25°C. This value is measured across the device terminals during transient suppression and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ5.0A maintains this clamping performance consistently due to its tightly controlled 6.4–7.0 V breakdown range and low dynamic impedance.
Is SMBJ5.0A suitable for bidirectional transient protection?
No, SMBJ5.0A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications - including forward voltage (VF = 3.5 V @ 50 A) and polarity marking - apply only in the reverse-breakdown direction. For bidirectional protection, TSC specifies parts with "C" or "CA" suffixes (e.g., SMBJ5.0C). Using SMBJ5.0A in AC or bipolar signal paths risks forward conduction failure and inadequate clamping in one polarity.
What package type does SMBJ5.0A use, and is it compatible with standard SMT reflow profiles?
SMBJ5.0A uses the DO-214AA (SMB) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability requirements. It is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be processed using standard lead-free reflow profiles without pre-baking. The package's UL 94V-0 molding compound also supports high-reliability automotive assembly standards.
How does SMBJ5.0A meet automotive EMC requirements such as ISO 7637-2?
SMBJ5.0A is explicitly validated to meet ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery transients), and Pulse 3a/3b (capacitive coupling and switching noise). Its 600 W peak pulse power rating, 9.2 V clamping at 800 A, and sub-1 ps response time ensure effective suppression of these standardized waveforms. Test data confirms compliance without external circuit modifications - a key requirement for Tier 1 automotive qualification.
What is the leakage current specification for SMBJ5.0A at its rated working voltage?
At its working stand-off voltage (VWM) of 5.0 V, the SMBJ5.0A exhibits a maximum blocking leakage current (ID) of 5.0 µA at TA = 25°C. This low leakage ensures minimal power loss in always-on 5 V circuits and prevents false triggering in high-impedance sensing nodes. Leakage remains within specification across the full operating temperature range (−55°C to +150°C), supporting reliable performance in under-hood and industrial environments.
SMBJ5.0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 68A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ5.0A FAQ
1.How can I place an order for SMBJ5.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ5.0A 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 SMBJ5.0A reliable?
The price and inventory of SMBJ5.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ5.0A is usually 5 days.
3.What payment methods are accepted for SMBJ5.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ5.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ5.0A?
SMBJ5.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ5.0A 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 SMBJ5.0A?
For technical support, including SMBJ5.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ5.0A requirements.
6.How does Aetrix verify that SMBJ5.0A is sourced from the original manufacturer or authorized distributors?
All SMBJ5.0A 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 SMBJ5.0A meets industry standards.
7.What is the process for return or replacement of SMBJ5.0A?
All SMBJ5.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ5.0A, 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 SMBJ5.0A part is unused and in its original packaging.
Return procedure for SMBJ5.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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