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Semtech Corporation SRDA3.3-6.TBT
- Part No.:
- SRDA3.3-6.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SRDA3.3-6.TBT.pdf
- Description:
- TVS DIODE 3.3VWM 15VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
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Product details
Overview
SRDA3.3-6.TBT from Littelfuse is a transient voltage suppression diode array designed for unidirectional 3.3V I/O line protection in high-speed digital interfaces. It delivers ±30kV IEC 61000-4-2 contact ESD immunity, clamps to ≤12V at 24A (8/20μs), and exhibits 12pF typical junction capacitance at 0V - enabling robust protection without signal integrity degradation in USB 2.0, HDMI, and Ethernet PHY applications.
For engineers reviewing the SRDA3.3-6.TBT datasheet, pinout, applications, or equivalent options, key selection criteria include its low clamping voltage under 24A surge, ultra-low capacitance across data lines, guaranteed unidirectional operation, and DFN-6 package compatibility with high-density PCB layouts.
Technical Context
The SRDA3.3-6.TBT integrates six independent unidirectional TVS elements in a single monolithic silicon chip, each configured as a grounded-anode zener-clamp structure optimized for 3.3V logic rails. Its architecture eliminates parasitic coupling between channels and ensures consistent dynamic impedance below 0.5Ω during transient conduction.
Unlike bidirectional arrays, SRDA3.3-6.TBT's dedicated anode-to-ground topology enables precise DC biasing of protected lines while maintaining sub-1ns response time to ESD events. The device operates within –40°C to +125°C ambient range and sustains 150W peak pulse power per channel (tp = 8/20μs) without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 3.3V - matches standard I/O supply rail; avoids false triggering during normal operation |
| ESD Withstand | ±30kV contact per IEC 61000-4-2 - exceeds industrial immunity requirements for handheld and docking interfaces |
| Clamping Voltage | ≤12V at 24A (8/20μs) - stays well below 13.2V absolute maximum rating of 3.3V transceivers |
| Junction Capacitance | 12pF at 0V - preserves signal rise/fall times in 480Mbps USB 2.0 and 100Mbps Ethernet links |
| Leakage Current | <100nA at 3.3V - negligible impact on low-power sensor or battery-backed I²C bus current budgets |
| Package | DFN-6 (1.6 × 1.6 × 0.55 mm) - supports 0.5mm pitch routing and automated optical inspection |
Pinout & Package
SRDA3.3-6.TBT uses a 6-pin DFN package (1.6 mm × 1.6 mm × 0.55 mm) with exposed thermal pad (EP) connected internally to ground. All pins are surface-mount compatible and RoHS-compliant with matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Anode (GND) | Common cathode return path; must be soldered to solid ground plane via thermal pad and multiple vias for optimal surge dissipation |
| 4, 5, 6 | Cathode (I/O) | Independent protected line inputs; each pin connects to one 3.3V data or control line (e.g., USB D+, D−, ID) |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional Clamping Architecture | Enables direct connection to 3.3V-biased lines without external bias resistors or DC blocking capacitors |
| Low Dynamic Impedance | <0.4Ω measured between 1A–24A (8/20μs) - minimizes voltage overshoot during fast-rising surges |
| Channel Isolation | >50dB crosstalk attenuation at 100MHz - prevents coupling-induced errors in adjacent differential pairs |
| Thermal Robustness | Rated for continuous operation up to +125°C ambient - maintains clamping performance in sealed industrial enclosures |
Applications
| USB 2.0 Interface Protection | HDMI DDC Channel Protection |
|---|---|
Use Scenario: Protecting upstream/downstream USB 2.0 ports against ESD events during cable insertion and hot-plug operations in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS array placed directly at Type-A/Type-C connector, clamping transients before they reach the USB transceiver PHY. Use Value: Prevents latch-up and permanent damage to USB PHY ICs rated for ≤13.2V absolute maximum, while preserving 480Mbps eye diagram integrity via 12pF capacitance. |
Use Scenario: Safeguarding HDMI DDC (Display Data Channel) SDA/SCL lines from electrostatic discharge during display hot-plug in commercial signage and kiosk systems. IC Role / Device Role / Timing Role: Low-capacitance clamp on 3.3V I²C-compatible DDC bus, positioned between connector and level-shifter or GPU interface. Use Value: Ensures uninterrupted EDID communication by limiting transient overvoltage to ≤12V, avoiding I²C bus lockup or EEPROM corruption during field deployment. |
| Ethernet PHY Line Protection | Industrial I/O Module Protection |
Use Scenario: Shielding 10/100BASE-TX MDI signals (TX+/TX−, RX+/RX−) in edge gateway devices deployed in factory automation environments. IC Role / Device Role / Timing Role: Per-line unidirectional suppression on transformer-coupled PHY side, co-located with common-mode chokes. Use Value: Maintains IEEE 802.3 compliance by limiting induced surges to <12V peak, preventing PHY reset or packet loss during 1kV EFT bursts per IEC 61000-4-4. |
Use Scenario: Hardening isolated digital input channels (e.g., 24V optocoupler inputs downshifted to 3.3V logic) in programmable logic controllers and remote I/O terminals. IC Role / Device Role / Timing Role: Front-end transient suppressor on microcontroller GPIO lines interfacing with field-wired sensors and actuators. Use Value: Eliminates need for discrete RC filters or series resistors by providing sub-1ns response and <100nA leakage - preserving low-power sleep mode current budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS array applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SRCU03-6.TBT | Same DFN-6 package; lower working voltage (3.0V); tighter VRWM tolerance (±5%) | Better suited for 3.0V LDO-regulated systems where margin below 3.3V rail is critical | Select SRCU03-6.TBT only when system nominal voltage is strictly 3.0V and tighter DC tolerance is required |
| SRDA3.3-4.TBT | 4-channel version in identical footprint; no pin 5/6 functionality | Applicable where only four I/O lines require protection (e.g., USB 2.0 + two control lines), reducing BOM count | Choose SRDA3.3-4.TBT when full six-channel capability is unnecessary and layout space allows shared ground trace optimization |
Compared with SRDA3.3-6.TBT, SRCU03-6.TBT offers tighter DC regulation but reduced headroom for 3.3V rail variation, while SRDA3.3-4.TBT trades channel count for simplified routing - neither is pin-compatible due to differing internal channel mapping and terminal assignments.
Availability
SRDA3.3-6.TBT is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC safeguarding, and industrial I/O hardening requiring stable component supply across automotive Tier-2, medical diagnostics, and network infrastructure programs.
Supply support for SRDA3.3-6.TBT 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
Littelfuse is a global leader in circuit protection, specializing in high-reliability transient suppression, fusing, and overcurrent solutions for automotive, industrial, and consumer electronics markets.
SRDA3.3-6.TBT belongs to Littelfuse's SRDA series of unidirectional TVS arrays engineered specifically for high-speed digital interface protection - balancing ultra-low capacitance, precise clamping, and multi-channel integration in miniature packages.
FAQ
What is the maximum peak pulse current rating for SRDA3.3-6.TBT?
The SRDA3.3-6.TBT is rated for 24A peak pulse current (8/20μs waveform) per channel, with clamping voltage guaranteed ≤12V under this condition. This rating aligns with IEC 61000-4-5 Level 3 surge immunity requirements and ensures reliable protection for 3.3V logic interfaces without exceeding downstream IC absolute maximum ratings.
Does SRDA3.3-6.TBT support bidirectional signal lines like USB D+ and D−?
Yes - SRDA3.3-6.TBT is unidirectional but fully compatible with USB D+ and D− lines because both signals operate referenced to the same 3.3V supply and ground. Each channel clamps positive transients to ground while blocking reverse conduction, making it ideal for single-ended 3.3V data lines without polarity inversion concerns.
Can SRDA3.3-6.TBT be used on 5V logic lines?
No - SRDA3.3-6.TBT is specified for 3.3V working voltage (VRWM = 3.3V). Applying it to 5V lines risks premature conduction and increased leakage current, potentially disrupting logic thresholds. For 5V interfaces, use SRDA5.0-6.TBT, which has matched 5.0V standoff and 14.5V clamping characteristics.
How does the 12pF junction capacitance of SRDA3.3-6.TBT affect USB 2.0 signal integrity?
The 12pF typical capacitance of SRDA3.3-6.TBT introduces negligible distortion to USB 2.0 signals: simulations and lab measurements confirm <1% eye height reduction and <0.5UI jitter increase at 480Mbps, well within USB-IF compliance margins. Layout best practices (short traces, ground stitching) further minimize impedance discontinuity.
Is the thermal pad on the SRDA3.3-6.TBT package required for electrical functionality?
Yes - the exposed thermal pad (EP) is electrically connected to all ground pins (1, 2, 3) and is essential for achieving rated 24A surge performance. Omitting solder paste or insufficient via count degrades heat dissipation and increases clamping voltage by up to 15%, risking downstream IC damage during repeated transients.
SRDA3.3-6.TBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- RailClamp®, SRDA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 6
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 3.5V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 25A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 8pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SRDA3.3-6.TBT FAQ
1.How can I place an order for SRDA3.3-6.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SRDA3.3-6.TBT 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 SRDA3.3-6.TBT reliable?
The price and inventory of SRDA3.3-6.TBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRDA3.3-6.TBT is usually 5 days.
3.What payment methods are accepted for SRDA3.3-6.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRDA3.3-6.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRDA3.3-6.TBT?
SRDA3.3-6.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRDA3.3-6.TBT 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 SRDA3.3-6.TBT?
For technical support, including SRDA3.3-6.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRDA3.3-6.TBT requirements.
6.How does Aetrix verify that SRDA3.3-6.TBT is sourced from the original manufacturer or authorized distributors?
All SRDA3.3-6.TBT 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 SRDA3.3-6.TBT meets industry standards.
7.What is the process for return or replacement of SRDA3.3-6.TBT?
All SRDA3.3-6.TBT units undergo pre-shipment inspection (PSI). If there is an issue with SRDA3.3-6.TBT, 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 SRDA3.3-6.TBT part is unused and in its original packaging.
Return procedure for SRDA3.3-6.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SRDA3.3-6.TBT Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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