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Taiwan Semiconductor Corporation SMBJ8V5A
- Part No.:
- SMBJ8V5A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8V5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:348
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Product details
Overview
SMBJ8V5A 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 8.5 V working stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 10 A peak pulse current, and 600 W peak pulse power rating with <1 ps response time. It is used in automotive infotainment power inputs and industrial sensor interface protection.
For engineers reviewing the SMBJ8V5A datasheet, SMBJ8V5A pinout, SMBJ8V5A application, or SMBJ8V5A equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current at operating voltage, thermal derating above 25°C ambient, and DO-214AA (SMB) PCB footprint compatibility with IPC-7351B standard land patterns.
Technical Context
The SMBJ8V5A operates as a unidirectional avalanche diode, conducting only during positive overvoltage transients relative to cathode orientation. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 8.5 V), while its 10 °C/W junction-to-case thermal resistance supports sustained surge handling under pulsed conditions per IEC 61000-4-5 and ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Designed for automated SMT placement, it meets J-STD-020 moisture sensitivity level 1 and JESD201 Class 2 whisker resistance. The device uses a single-die DO-214AA (SMB) package with matte tin-plated leads compliant with J-STD-002 solderability requirements and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin. |
| VBR min/max | 9.44 V / 10.4 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPP | 14.4 V @ 10 A - Clamping voltage limits transient energy delivered to downstream ICs during 10/1000 µs surges. |
| PPK | 600 W - Peak pulse power rating defines maximum transient energy absorption capability per IEC 61000-4-5. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in low-power sensor nodes. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive environments. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration with cathode band marking. Dimensions conform to JEDEC DO-214AA standard; recommended pad layout follows IPC-7351B SMB generic footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12 V supply rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| Fast response time <1 ps | Clamps ESD events before sensitive CMOS inputs reach destructive voltage thresholds (e.g., <±2 kV HBM). |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and inductive-switching immunity without external filtering components. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V power input of infotainment head units from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges above 14.4 V. Use Value: Limits transient voltage to ≤14.4 V at 10 A, preventing damage to downstream DC-DC converters rated for 16 V max input. | Use Scenario: Shielding RS-485 transceiver I/O pins from EFT bursts in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMBJ8V5A used on VCC line only, paired with bidirectional TVS on data lines. Use Value: Sub-µA leakage at 8.5 V avoids loading low-current sensor bias networks while clamping fast 5 ns rise-time EFT pulses. |
| LED Driver Input Stage | Medical Diagnostic Equipment Power Entry |
Use Scenario: Safeguarding constant-current LED driver ICs against inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: Placed across input capacitor to absorb 100–200 A, 10/1000 µs surges generated by relay coil de-energization. Use Value: 600 W PPK rating sustains multiple surges without degradation; 10 °C/W RθJC enables thermal recovery between events. | Use Scenario: Guarding isolated DC-DC converter primary-side input against mains-coupled transients in portable ultrasound devices. IC Role / Device Role / Timing Role: First-line protection on 24 V input rail upstream of isolation barrier; unidirectional orientation matches system grounding scheme. Use Value: UL 94V-0 package compound prevents flame propagation in enclosed medical enclosures; MSL Level 1 eliminates bake-out prior to reflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A (ON Semiconductor) | Identical VWM (8.5 V), VBR (9.44–10.4 V), VC (14.4 V), and DO-214AA package; same 600 W rating. | No functional difference; validated for identical ISO 7637-2 and IEC 61000-4-5 test profiles. | Select based on distributor lead time and traceability requirements; both meet J-STD-020 MSL Level 1. |
| P6SMB8.5A (Littelfuse) | VWM = 8.5 V, VBR = 9.4–10.4 V, VC = 14.4 V, same DO-214AA package and 600 W rating; minor variation in IR spec (≤1 µA vs ≤2 µA). | Same clamping performance; certified to AEC-Q101 but not required for non-automotive use. | Prefer for automotive-qualified BOMs; otherwise functionally interchangeable with SMBJ8V5A in industrial designs. |
Compared with SMBJ8V5A, SMBJ8.5A offers identical electrical and mechanical specifications with equivalent supply chain availability, while P6SMB8.5A adds AEC-Q101 qualification-valuable for automotive programs but unnecessary for general-purpose surge protection where cost and lead time dominate selection.
Availability
SMBJ8V5A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor interfaces, and LED driver input stages requiring stable component supply, consistent parametric performance, and full traceability from wafer lot to shipment.
Supply support for SMBJ8V5A 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, and MOSFETs for industrial and automotive markets.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh electromagnetic environments, targeting compliance with ISO 7637-2 and IEC 61000-4-5 without external circuitry.
FAQ
What is the maximum clamping voltage of SMBJ8V5A at its rated peak pulse current?
The SMBJ8V5A has a maximum clamping voltage (VC) of 14.4 V when subjected to a 10 A peak impulse current (IPP) with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 14.4 V during specified surge events. The SMBJ8V5A maintains this clamping performance across its full operating temperature range.
Is SMBJ8V5A suitable for bidirectional transient protection?
No, SMBJ8V5A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications-including breakdown voltage, clamping voltage, and leakage current-are defined only for reverse-bias (cathode-positive) conditions. For bidirectional protection, a part with "C" or "CA" suffix (e.g., SMBJ8.5CA) must be selected, as confirmed in the manufacturer's ordering information and electrical tables.
What is the marking code for SMBJ8V5A on the device body?
The marking code for SMBJ8V5A is "KT", as specified in the Electrical Specifications table on page 2 of the Taiwan Semiconductor SMBJ Series datasheet (Version R2104). This two-character laser mark appears adjacent to the cathode band on the DO-214AA (SMB) package and is used for visual identification and traceability during assembly and inspection.
Does SMBJ8V5A require special handling for moisture sensitivity?
No-SMBJ8V5A is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life and does not require dry pack storage or baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during standard Pb-free reflow profiles, making SMBJ8V5A ideal for high-volume automated SMT lines.
What is the thermal resistance from junction to ambient for SMBJ8V5A?
The SMBJ8V5A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W under standard JEDEC test conditions (on FR-4 board with 1 in² copper pad). This value informs thermal design margins when estimating steady-state temperature rise during continuous power dissipation; however, the device is intended for transient (not continuous) operation, so RθJA is primarily relevant for surge repetition rate analysis.
SMBJ8V5A 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- 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)
SMBJ8V5A FAQ
1.How can I place an order for SMBJ8V5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8V5A 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 SMBJ8V5A reliable?
The price and inventory of SMBJ8V5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8V5A is usually 5 days.
3.What payment methods are accepted for SMBJ8V5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8V5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8V5A?
SMBJ8V5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8V5A 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 SMBJ8V5A?
For technical support, including SMBJ8V5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8V5A requirements.
6.How does Aetrix verify that SMBJ8V5A is sourced from the original manufacturer or authorized distributors?
All SMBJ8V5A 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 SMBJ8V5A meets industry standards.
7.What is the process for return or replacement of SMBJ8V5A?
All SMBJ8V5A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8V5A, 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 SMBJ8V5A part is unused and in its original packaging.
Return procedure for SMBJ8V5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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