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Taiwan Semiconductor Corporation SMBJ64A
- Part No.:
- SMBJ64A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ64A.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,400
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Product details
Overview
SMBJ64A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power lines and signal interfaces. It features a 64V working stand-off voltage (VWM), 71.1–78.6V breakdown voltage (VBR), 103V maximum clamping voltage (VC) at 6.1A peak pulse current (IPP), and <1μA leakage above 10V - deployed in automotive infotainment power rails and industrial sensor I/O protection.
For engineers reviewing the SMBJ64A datasheet, SMBJ64A pinout, SMBJ64A application, or SMBJ64A equivalent, key selection criteria include clamping performance under 10/1000µs transients, thermal derating above 25°C ambient, unidirectional polarity marking, and compatibility with J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Technical Context
The SMBJ64A operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1ps response to ESD and electrical fast transients (EFT). Its unidirectional configuration enables asymmetric clamping - forward conduction only during reverse overvoltage events - with VF = 3.5V at 50A for devices ≤90V VWM.
It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity standards and supports operation from −55°C to +150°C junction temperature. Thermal resistance values are RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable power dissipation in compact PCB layouts without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin below breakdown. |
| VBR min/max | 71.1 V / 78.6 V @ IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPP | 103 V @ 6.1 A (10/1000 µs) - Peak clamped voltage seen by protected circuit; limits downstream stress during surge events. |
| PPK | 600 W - Non-repetitive peak pulse power handling; determines survivability against single high-energy transients like load dump. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; critical for low-power sensor nodes and battery-backed systems where quiescent current matters. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design boundary for PCB copper area and ambient conditions. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow profiles. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Weight ≈ 0.090 g. Meets UL 94V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during reverse overvoltage to clamp voltage. |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential side (e.g., VIN); avalanche breakdown initiates here during transient overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 103 V VC at 6.1 A (10/1000 µs) - Limits voltage overshoot to safe levels for 3.3V/5V/12V logic and analog ICs. |
| Response time | <1 ps - Enables effective suppression of ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) events before system damage occurs. |
| Leakage control | <1 µA ID at 64 V - Preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| Automated assembly support | DO-214AA footprint with J-STD-002-compliant terminations - Ensures robust solder joint formation in high-volume SMT lines. |
| Environmental compliance | RoHS-compliant and halogen-free per IEC 61249-2-21 - Meets global regulatory requirements for industrial and automotive end equipment. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V power inputs in vehicle body control modules from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp transients exceeding 64V while blocking normal operating voltage. Use Value: Withstands 600W non-repetitive pulses and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b - ensuring functional safety compliance without derating. |
Use Scenario: Shielding 4–20mA current-loop transmitters and RS-485 nodes from induced lightning surges and EFT bursts. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMBJ64A used in unidirectional configuration on supply rail, paired with series impedance for signal-line protection. Use Value: 103V clamping voltage prevents latch-up in precision op-amps and ADC front-ends operating up to 36V input range. |
| LED Driver Input Protection | DC-DC Converter Input Stage |
Use Scenario: Safeguarding constant-current LED drivers in streetlight and signage applications exposed to utility grid switching transients. IC Role / Device Role / Timing Role: Primary surge shunt on DC input bus upstream of bulk capacitor and controller IC. Use Value: 6.1A IPP rating handles 10/1000µs surges up to 600W - maintaining LED output stability and avoiding driver IC reset or destruction. |
Use Scenario: Input-side transient suppression for isolated 48V-to-12V DC-DC converters in telecom power systems. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing line-side spikes before they reach primary-side MOSFETs and PWM controllers. Use Value: 71.1–78.6V VBR ensures no conduction during nominal 48V operation, while 103V VC limits stress on 100V-rated input capacitors and FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64CA | Bidirectional variant with same VWM (64V), symmetric clamping in both polarities; VBR min/max = 71.1–78.6V, VC = 103V @ 6.1A. | Required when protecting AC-coupled signals or bidirectional buses (e.g., CAN, RS-485) where polarity reversal occurs. | Select SMBJ64CA only if circuit experiences reversible overvoltage; SMBJ64A is preferred for DC rail protection due to lower leakage and tighter VF spec. |
| SMAJ64A | Lower PPK = 400W, same VWM = 64V, VC = 103V @ 4.1A; DO-214AC (SMA) package - smaller footprint but higher RθJA = 65°C/W. | Suitable for space-constrained consumer electronics with lower surge exposure; not recommended for automotive or industrial environments requiring 600W immunity. | Choose SMAJ64A only when board area is critical and surge threat level is limited to IEC 61000-4-2 Level 3 (±8 kV contact); SMBJ64A remains standard for ISO 7637-2 compliance. |
Compared with SMBJ64CA and SMAJ64A, the SMBJ64A provides optimal balance of 600W surge capacity, 103V clamping, and DO-214AA manufacturability - making it the default choice for unidirectional DC rail protection where thermal margin and reliability are prioritized over footprint minimization or bidirectional capability.
Availability
SMBJ64A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and LED driver input protection requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for SMBJ64A 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, rectifiers, and MOSFETs for industrial, automotive, and computing markets.
The SMBJ series was developed to deliver high-power, surface-mount transient suppression with consistent clamping and AEC-Q200-aligned reliability - targeting 12V/24V/48V DC systems in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of SMBJ64A under standard 10/1000µs surge conditions?
The SMBJ64A has a maximum clamping voltage (VC) of 103 V when subjected to a 6.1 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Taiwan Semiconductor's R2104 datasheet - defining the upper voltage limit imposed on protected circuitry during surge events.
Is SMBJ64A suitable for bidirectional signal line protection such as RS-485 or CAN bus?
No, SMBJ64A is a unidirectional TVS diode and must not be used alone on bidirectional signal lines. For RS-485 or CAN, use the bidirectional SMBJ64CA variant instead. SMBJ64A conducts only during reverse overvoltage and would short the signal line during normal positive-going data transitions.
What is the leakage current specification for SMBJ64A at its rated working voltage?
The SMBJ64A exhibits a maximum blocking leakage current (ID) of less than 1 µA when biased at its 64 V working stand-off voltage (VWM) and tested at 25°C. This low leakage preserves efficiency in battery-powered systems and avoids loading high-impedance sensor outputs.
Does SMBJ64A meet automotive transient immunity standards?
Yes, SMBJ64A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - validating its suitability for 12V and 24V automotive power networks. Its 600W peak pulse rating and 103V clamping ensure robustness against load dump, alternator ripple, and inductive switching transients.
What is the thermal resistance from junction to ambient for SMBJ64A in standard PCB mounting?
The SMBJ64A has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value assumes no additional heatsinking; actual thermal performance improves with larger copper areas or internal layers, critical for sustained surge duty cycles.
SMBJ64A 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- 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)
SMBJ64A FAQ
1.How can I place an order for SMBJ64A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ64A 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 SMBJ64A reliable?
The price and inventory of SMBJ64A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ64A is usually 5 days.
3.What payment methods are accepted for SMBJ64A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ64A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ64A?
SMBJ64A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ64A 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 SMBJ64A?
For technical support, including SMBJ64A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ64A requirements.
6.How does Aetrix verify that SMBJ64A is sourced from the original manufacturer or authorized distributors?
All SMBJ64A 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 SMBJ64A meets industry standards.
7.What is the process for return or replacement of SMBJ64A?
All SMBJ64A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ64A, 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 SMBJ64A part is unused and in its original packaging.
Return procedure for SMBJ64A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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