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NXP Semiconductors 74HCT3G34GD,125
- Part No.:
- 74HCT3G34GD,125
- Manufacturer:
- NXP Semiconductors
- Package:
- 8-XFDFN
- Datasheet:
-
74HCT3G34GD,125.pdf
- Description:
- IC BUFFER GATE TRIPLE XSON8U
- Quantity:
- Payment:
- Shipping:
Inventory:36,000
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Product details
Overview
74HCT3G34GD,125 from Nexperia is a triple non-inverting buffer gate IC with TTL-compatible inputs, 8-pin XSON package (2 mm × 1.25 mm), 4.5 V to 5.5 V supply range, propagation delay of 10–29 ns at VCC = 4.5 V, and operation up to +125 °C - used for signal level translation and fanout expansion in industrial control logic interfaces.
For engineers reviewing the 74HCT3G34GD,125 datasheet, 74HCT3G34GD,125 pinout, 74HCT3G34GD,125 application, or 74HCT3G34GD,125 equivalent, key selection criteria include input voltage compatibility (TTL-level thresholds), output drive capability (±4 mA at 4.5 V), thermal performance in compact PCB layouts, and qualification for extended temperature industrial use.
Technical Context
This device implements three independent, unidirectional, non-inverting buffer stages in a single monolithic CMOS IC. Each channel features diode-clamped inputs enabling safe interfacing to voltages exceeding VCC when current-limiting resistors are used.
It operates under JEDEC-compliant TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), delivers rail-to-rail CMOS outputs, and maintains static and dynamic performance across -40 °C to +125 °C ambient, with latch-up immunity >100 mA per JESD78 Class II Level B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems and stable operation under industrial rail tolerances. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees reliable recognition of legacy TTL logic levels without level-shifting circuitry. |
| Output Drive | ±4.0 mA at VCC = 4.5 V - supports direct driving of multiple standard CMOS inputs or moderate capacitive loads (<50 pF). |
| Propagation Delay | 10–29 ns (tpd, nA→nY) - enables timing-critical signal buffering in sub-30 ns logic paths at 4.5 V. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood, motor control, and high-ambient industrial environments. |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces risk of field failure during handling and board assembly in automated lines. |
| Power Dissipation | CPD = 9 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal budgeting. |
Pinout & Package
XSON8U (SOT833-1) plastic ultra-thin small outline no-lead package: 2.0 mm × 1.25 mm body, 0.5 mm pitch, exposed thermal pad, moisture sensitivity level 1 (MSL1), lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1A | Channel 1 data input - accepts TTL-level signals; clamped to protect against overvoltage when used with series resistors. |
| 2 | 2Y | Channel 2 data output - CMOS rail-to-rail output capable of sourcing/sinking ±4 mA at 4.5 V. |
| 3 | GND | Ground reference - must be low-impedance connection; ties internal substrate and ESD structures. |
| 4 | 3A | Channel 3 data input - electrically identical to Pin 1; supports independent signal routing per channel. |
| 5 | 3Y | Channel 3 data output - matches Pin 2 electrical behavior; enables parallel fanout without loading shared nodes. |
| 6 | VCC | Positive supply - decoupling capacitor (100 nF ceramic) required within 3 mm for noise immunity and transient response. |
| 7 | 1Y | Channel 1 data output - provides first buffered output; isolated from other channels to prevent crosstalk. |
| 8 | 2A | Channel 2 data input - completes triple-buffer set; all inputs share same TTL threshold specification. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with legacy 5 V microcontrollers, FPGAs, and logic families without external level shifters. |
| Input clamp diodes | Allows safe connection to signals up to VCC + 0.5 V using series current-limiting resistors - simplifies mixed-voltage system design. |
| Low dynamic power | CPD = 9 pF minimizes switching power in high-frequency applications (e.g., clock distribution or data strobing). |
| High noise immunity | Guaranteed VIH/VIL margins (>0.4 V noise margin at VCC = 4.5 V) suppress false triggering in electrically noisy industrial settings. |
| Extended temperature grade | Rated for continuous operation from -40 °C to +125 °C - suitable for motor drives, PLC I/O modules, and power supply monitoring circuits. |
Applications
| Industrial PLC I/O Expansion | Microcontroller GPIO Fanout |
|---|---|
|
Use Scenario: Buffering digital status signals from multiple sensors into a single microcontroller input port with isolation between channels. IC Role / Device Role / Timing Role: Signal integrity preservation and load isolation - each buffer drives one sensor line independently while preventing cross-talk. Use Value: Eliminates need for discrete transistors or larger logic packages; saves PCB area in space-constrained DIN-rail mounted controllers. |
Use Scenario: Expanding limited GPIO count on an ARM Cortex-M0+ MCU to drive eight external peripherals via three parallel buffers. IC Role / Device Role / Timing Role: Logic-level repeater - maintains signal rise/fall times below 25 ns to meet setup/hold timing of downstream SPI slaves. Use Value: Enables deterministic timing without adding FPGA or CPLD complexity; supports hot-plug detection with minimal latency. |
| Automated Test Equipment (ATE) Signal Conditioning | Motor Control Feedback Interface |
|
Use Scenario: Conditioning TTL-level trigger pulses from test fixtures before feeding into high-speed digitizers with strict input voltage windows. IC Role / Device Role / Timing Role: Input voltage translator and jitter-reducing repeater - converts variable-amplitude triggers to clean 0/5 V logic with <30 ns skew between channels. Use Value: Improves measurement repeatability by eliminating marginal logic transitions; allows reuse of legacy TTL sources with modern ADCs. |
Use Scenario: Isolating Hall-effect encoder signals from PWM noise in BLDC motor driver PCBs before reaching position controller ICs. IC Role / Device Role / Timing Role: Noise-immune signal buffer - rejects common-mode transients via high VIH/VIL separation and internal clamping. Use Value: Prevents position misreads during high-dV/dt commutation events; eliminates need for RC filtering that degrades edge fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC3G34GM,125 | Wider supply range (1.65–5.5 V), lower VIH (1.7 V min), higher speed (tpd = 3.2 ns typ at 3.3 V) | Better suited for mixed-voltage 3.3 V/5 V systems and battery-powered devices requiring ultra-low static current | Select when operating below 4.5 V or needing faster propagation than 74HCT3G34GD,125 offers |
| SN74LVC3G34DCUR | Same logic function, TSSOP-8 package (3 mm × 2.3 mm), higher output drive (±24 mA), no input clamps | Preferred where board real estate permits larger package and higher current drive is needed for LED or relay drivers | Choose if mechanical compatibility with existing TSSOP footprints is required and clamping is not critical |
Compared with 74LVC3G34GM,125 and SN74LVC3G34DCUR, the 74HCT3G34GD,125 uniquely balances TTL input compatibility, compact XSON8U footprint, and robust industrial temperature rating - making it optimal for retrofitting legacy 5 V designs where space and thermal constraints dominate.
Availability
74HCT3G34GD,125 is available at Aetrix Electronics and suitable for industrial automation, motor control, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT3G34GD,125 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions optimized for reliability and manufacturability.
The 74HCT3G34GD,125 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically for robust interoperability with legacy TTL systems while maintaining CMOS power efficiency and industrial-grade environmental resilience.
FAQ
What is the maximum recommended operating voltage for 74HCT3G34GD,125?
The absolute maximum supply voltage is +7.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V per JEDEC JESD7A and datasheet Section 9. Operation outside this window risks violating input threshold specifications, increasing ICC, and reducing noise margin - especially above 5.5 V where VOH degradation begins.
Does 74HCT3G34GD,125 support mixed-voltage interfacing (e.g., 3.3 V input to 5 V system)?
No - its TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) are specified only for VCC = 4.5–5.5 V. A 3.3 V logic high may fall below guaranteed VIH at VCC = 5.5 V (2.0 V min), risking unreliable recognition. For true mixed-voltage use, consider 74LVC3G34 instead.
Can the input clamp diodes be used continuously with external current-limiting resistors?
Yes - the datasheet explicitly enables this use case. With VI < −0.5 V or VI > VCC + 0.5 V, input clamping current is rated to ±20 mA. Using a series resistor ≥250 Ω limits current to safe levels even with +12 V inputs, provided total power dissipation in the diode remains within thermal limits.
Is the exposed thermal pad on the XSON8U package required to be soldered to PCB ground?
Yes - the thermal pad (Pin 9, non-functional electrically) must be soldered to a minimum 10 mm² copper pour tied to GND for thermal performance and mechanical reliability. Omitting this compromises junction temperature rise by >15 °C at 50 mW dissipation and increases risk of solder joint fracture during thermal cycling.
74HCT3G34GD,125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 8-XFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 3
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-XSON (2x3)
74HCT3G34GD,125 FAQ
1.How can I place an order for 74HCT3G34GD,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT3G34GD,125 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 74HCT3G34GD,125 reliable?
The price and inventory of 74HCT3G34GD,125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT3G34GD,125 is usually 5 days.
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Once your 74HCT3G34GD,125 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 74HCT3G34GD,125?
For technical support, including 74HCT3G34GD,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT3G34GD,125 requirements.
6.How does Aetrix verify that 74HCT3G34GD,125 is sourced from the original manufacturer or authorized distributors?
All 74HCT3G34GD,125 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 74HCT3G34GD,125 meets industry standards.
7.What is the process for return or replacement of 74HCT3G34GD,125?
All 74HCT3G34GD,125 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT3G34GD,125, 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 74HCT3G34GD,125 part is unused and in its original packaging.
Return procedure for 74HCT3G34GD,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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