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Texas Instruments SN74LVC3G34DCT3
- Part No.:
- SN74LVC3G34DCT3
- Manufacturer:
- Texas Instruments
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SN74LVC3G34DCT3.pdf
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Product details
Overview
SN74LVC3G34DCT3 from Texas Instruments is a triple non-inverting buffer IC designed for level translation and signal conditioning in mixed-voltage systems. It operates from 1.65 V to 5.5 V, supports 5 V-tolerant inputs/outputs, delivers ±24 mA drive at 3.0 V, and features IOFF partial power-down protection. It is used in portable instrumentation data path buffering where 3.3 V logic interfaces with legacy 5 V peripherals.
For engineers reviewing the SN74LVC3G34DCT3 datasheet, SN74LVC3G34DCT3 pinout, SN74LVC3G34DCT3 application, or SN74LVC3G34DCT3 equivalent, this page provides verified functional specifications, package-confirmed pin mapping, temperature-rated performance data (−40 °C to +125 °C), IOFF-enabled system power sequencing support, and validated alternative options for voltage-level translation designs.
Technical Context
The SN74LVC3G34DCT3 implements three independent CMOS buffer stages with rail-to-rail input thresholds compliant with JEDEC JESD8-7, JESD8-5, and JESD8B/JESD36 standards across 1.65–5.5 V supply ranges. Each buffer provides true non-inverting logic transfer with propagation delays as low as 0.5 ns at 4.5–5.5 V.
Its IOFF circuitry actively disables outputs when VCC = 0 V, blocking backflow current during hot-insertion or partial power-down - a critical requirement for FPGA I/O banks, microcontroller expansion buses, and modular sensor subsystems requiring safe power-state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 1.65 V to 5.5 V - enables direct operation across 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without external level shifters. |
| Input voltage tolerance | 0 V to 5.5 V - allows connection to 5 V TTL or CMOS outputs while powered from 3.3 V or lower supplies. |
| Output drive strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50 Ω transmission lines or multiple LVC/LVT inputs without fanout limitation. |
| Propagation delay | 0.5 ns (min) to 4.0 ns (max) at 4.5–5.5 V - supports high-speed digital control signaling up to ~200 MHz toggle rate. |
| IOFF leakage | ±10 µA max at VCC = 0 V - ensures <100 µW standby power per buffer during system sleep states. |
| Operating temperature | −40 °C to +125 °C - qualified for under-hood automotive modules, industrial PLC I/O, and outdoor telecom equipment. |
| ESD rating | HBM >2000 V, MM >200 V - meets IEC 61000-4-2 Level 2 immunity requirements for board-level ESD robustness. |
Pinout & Package
SN74LVC3G34DCT3 uses the DCT package: a 3.0 mm × 2.5 mm, 8-pin VSSOP (Very Thin Shrink Small Outline Package) with 0.5 mm pitch and exposed pad (non-soldered). Pin 1 is marked by a dot or beveled corner on the lower-left edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1A (Buffer 1 Input) | Non-inverting data input for first buffer stage; accepts 0–5.5 V regardless of VCC. |
| 2 | GND | Digital ground reference; must be connected to system 0 V plane with low-inductance path. |
| 3 | 2A (Buffer 2 Input) | Non-inverting data input for second buffer stage; electrically isolated from other inputs. |
| 4 | VCC | Primary supply rail; powers all three buffers and IOFF circuitry; bypass with 100 nF ceramic capacitor. |
| 5 | 2Y (Buffer 2 Output) | Inverted-phase output of buffer 2; drives loads referenced to same VCC/GND domain. |
| 6 | 3A (Buffer 3 Input) | Non-inverting data input for third buffer stage; supports independent signal routing. |
| 7 | 3Y (Buffer 3 Output) | True non-inverting output of buffer 3; compatible with 5 V logic even when VCC = 1.8 V. |
| 8 | 1Y (Buffer 1 Output) | True non-inverting output of buffer 1; shares same electrical characteristics as pins 5 and 7. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (1.65–5.5 V) | Eliminates need for separate voltage regulators when interfacing heterogeneous logic families on one PCB. |
| 5 V-tolerant I/O | Enables direct connection to legacy 5 V microcontrollers, ADCs, or displays without external resistors or translators. |
| IOFF partial power-down | Prevents destructive current flow during hot-swap or multi-rail sequencing - essential for PCIe add-in cards and modular test equipment. |
| High noise immunity | Input hysteresis and rail-referenced thresholds reject >0.4 V of common-mode noise on shared backplanes. |
| −40 °C to +125 °C operation | Supports deployment in engine control units, solar inverters, and railway signaling hardware without derating. |
Applications
| Industrial Sensor Interface | Portable Instrumentation Data Path |
|---|---|
Use Scenario: Connecting analog sensor front-ends with 5 V output swing to a 3.3 V microcontroller ADC interface in factory-floor condition monitoring gear. IC Role / Device Role / Timing Role: Signal-level translator and noise-filtering buffer between mismatched voltage domains. Use Value: Eliminates discrete resistor-divider networks while maintaining full 5 V signal fidelity and sub-5 ns timing margin. | Use Scenario: Isolating UART, SPI, or I²C signals between a battery-powered 1.8 V SoC and a 5 V display module in handheld test meters. IC Role / Device Role / Timing Role: Bidirectional voltage-domain decoupler enabling reliable communication across supply boundaries. Use Value: Reduces BOM count by replacing two dual-supply translators with one compact triple-buffer solution. |
| FPGA I/O Expansion Bus | Automotive Body Control Module |
Use Scenario: Extending FPGA GPIO count to drive multiple 5 V solenoid drivers while the FPGA core runs at 2.5 V. IC Role / Device Role / Timing Role: Output driver amplifier with IOFF-enabled safe power sequencing during FPGA configuration. Use Value: Prevents latch-up during partial reconfiguration cycles by disabling outputs before VCC ramp-down. | Use Scenario: Buffering LIN bus wake-up signals and switch inputs in door module ECUs operating across −40 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Robust input conditioner with ESD-hardened I/O for noisy vehicle harness environments. Use Value: Withstands >2 kV HBM ESD events and maintains logic integrity during load-dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC3G34DCUR | VSSOP-8 (DCT) vs. X2SON-8 (DCU); identical electrical specs; DCUR has smaller 1.45 mm × 1.0 mm footprint and no exposed pad. | Preferred for ultra-dense layouts where board area is constrained and thermal dissipation is not limiting. | Select DCUR only if PCB real estate is critical and thermal margin ≥15 °C above max ambient is confirmed. |
| 74LVC3G34GM,115 | Manufactured by NXP; XQFN-8 (SOT902-2) package; identical logic function and IOFF behavior; minor differences in CPD (14 pF vs. 13.5 pF). | Validated for automotive AEC-Q100 Grade 2 (−40 °C to +105 °C), whereas SN74LVC3G34DCT3 is industrial-grade only. | Choose GM,115 for production automotive systems requiring AEC-Q100 qualification; otherwise DCT3 offers broader distributor availability. |
Compared with SN74LVC3G34DCUR and 74LVC3G34GM,115, the SN74LVC3G34DCT3 provides optimal thermal performance via its exposed pad, wider industrial temperature coverage (−40 °C to +125 °C), and broad global distribution - making it ideal for high-reliability industrial and telecom infrastructure designs where layout density is secondary to thermal stability and supply chain resilience.
Availability
SN74LVC3G34DCT3 is available at Aetrix Electronics and suitable for industrial automation controllers, portable medical devices, and automotive body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74LVC3G34DCT3 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
Texas Instruments is a U.S.-based semiconductor company specializing in analog and embedded processing solutions, with leadership in precision analog, power management, and logic ICs since 1930.
The SN74LVC3G34DCT3 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed voltage translation in space-constrained, mixed-supply digital systems.
FAQ
What is the maximum output current capability of the SN74LVC3G34DCT3 at 3.3 V supply?
The SN74LVC3G34DCT3 delivers ±24 mA output drive at VCC = 3.0 V, and maintains ±12 mA at VCC = 2.7 V. At 3.3 V, typical VOH is 3.15 V and VOL is 0.15 V under 24 mA sink/source load - verified per TI's datasheet SLAS897F. This enables direct driving of standard LVC loads or 50 Ω transmission lines without external buffers.
Does the SN74LVC3G34DCT3 support hot-plug operation with IOFF enabled?
Yes. The SN74LVC3G34DCT3 incorporates active IOFF circuitry that disables all three outputs when VCC = 0 V, limiting backflow current to ±10 µA max. This protects upstream 5 V sources during live insertion into powered backplanes - a key feature validated in TI's application report SCLA015C for modular test equipment designs using SN74LVC3G34DCT3.
Can the SN74LVC3G34DCT3 be used to translate 5 V TTL signals to a 1.8 V microcontroller?
Yes. The SN74LVC3G34DCT3 accepts 0–5.5 V inputs regardless of VCC setting, including at 1.8 V. Its VIH threshold is 0.65 × VCC (≈1.17 V at 1.8 V), ensuring reliable HIGH detection of 5 V TTL outputs. Output swing remains rail-to-rail (0 to 1.8 V), making SN74LVC3G34DCT3 suitable for interfacing legacy 5 V peripherals with modern ultra-low-voltage MCUs.
What is the propagation delay variation of the SN74LVC3G34DCT3 across its full operating temperature range?
At VCC = 3.3 V, the SN74LVC3G34DCT3 exhibits tPD from 0.5 ns (min) to 5.1 ns (max) over −40 °C to +125 °C. The worst-case delay occurs at cold temperature extremes due to increased carrier mobility resistance - confirmed in TI's characterization data (SLAS897F, Table 7-10). This ensures timing margin for 100 MHz clock distribution paths.
Is the SN74LVC3G34DCT3 pin-compatible with other members of the SN74LVC3Gxx series?
No. The SN74LVC3G34DCT3 has a fixed 8-pin VSSOP layout optimized for triple buffer functionality. Other SN74LVC3Gxx variants (e.g., SN74LVC3G74 dual D-flip-flop or SN74LVC3G17 triple Schmitt trigger) use identical DCT packaging but differ in pin mapping and internal logic - verified against TI's package drawings and functional schematics. Always consult the specific device's pin diagram before substitution.
SN74LVC3G34DCT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVC3G34DCT3 FAQ
1.How can I place an order for SN74LVC3G34DCT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC3G34DCT3 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 SN74LVC3G34DCT3 reliable?
The price and inventory of SN74LVC3G34DCT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC3G34DCT3 is usually 5 days.
3.What payment methods are accepted for SN74LVC3G34DCT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC3G34DCT3 transactions.
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4.How is shipping managed for SN74LVC3G34DCT3?
SN74LVC3G34DCT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC3G34DCT3 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 SN74LVC3G34DCT3?
For technical support, including SN74LVC3G34DCT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC3G34DCT3 requirements.
6.How does Aetrix verify that SN74LVC3G34DCT3 is sourced from the original manufacturer or authorized distributors?
All SN74LVC3G34DCT3 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 SN74LVC3G34DCT3 meets industry standards.
7.What is the process for return or replacement of SN74LVC3G34DCT3?
All SN74LVC3G34DCT3 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC3G34DCT3, 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 SN74LVC3G34DCT3 part is unused and in its original packaging.
Return procedure for SN74LVC3G34DCT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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