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onsemi 74LVTH125MTCX
- Part No.:
- 74LVTH125MTCX
- Manufacturer:
- onsemi
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVTH125MTCX.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
74LVTH125MTCX from Fairchild Semiconductor is a low-voltage quad non-inverting buffer IC with 3-STATE outputs, designed for 3.3V VCC bus interface applications interfacing with 5V TTL systems. It delivers ±32mA/±64mA drive strength, supports –40°C to +85°C operation, and features bushold inputs eliminating external pull-ups - used in backplane data buffering and hot-swap I/O expansion.
For engineers reviewing the 74LVTH125MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include 3.3V-compatible 5V-tolerant I/O, high-current 3-STATE drive capability, bushold input retention, live insertion support, and TSSOP-14 packaging for space-constrained board layouts.
Technical Context
The 74LVTH125MTCX implements four independent BiCMOS-based non-inverting buffers, each with separate 3-STATE enable control (via Bn pins), enabling selective bus isolation. Its architecture combines TTL-level input compatibility (VIH = 2.0V min at VCC = 2.7–3.6V) with 3.3V supply operation and robust 5V-tolerant I/O protection.
It provides glitch-free power-up/down behavior via high-impedance outputs during supply transitions, and integrates bushold circuitry on all data inputs (An) to maintain logic state without external biasing - critical for unconnected or floating input scenarios in modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - ensures stable operation across industrial-grade 3.3V rail tolerances. |
| IOH/IOL | –32mA / +64mA - drives heavy capacitive loads or multiple TTL inputs without signal degradation. |
| tPLH/tPHL | 1.0ns to 4.5ns (max) - enables high-speed data transfer in 50MHz+ bus environments. |
| VIH/VIL | 2.0V / 0.8V - guarantees reliable recognition of 5V TTL HIGH/LOW levels while powered at 3.3V. |
| Bushold Drive | ±75µA at VI = 0.8V/2.0V - actively holds floating inputs at valid logic states, removing need for PCB pull resistors. |
| ESD Rating | 2000V HBM - protects against handling damage during assembly and field service. |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature deployment. |
Pinout & Package
74LVTH125MTCX is housed in a 14-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch - optimized for high-density PCB layouts and automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Data Inputs (A1–A4) | Bushold-enabled inputs accepting 0–5.5V logic; retain last valid state when floating. |
| 2, 5, 9, 12 | Output Enables (B1–B4) | Active-HIGH enables; assert HIGH to activate corresponding buffer output. |
| 3, 6, 8, 11 | 3-STATE Outputs (O1–O4) | Non-inverting buffered outputs; go HIGH-Z when Bn = LOW. |
| 7 | GND | Ground reference for all internal circuitry and I/O. |
| 14 | VCC | 3.3V supply input; must be decoupled locally per high-speed digital practice. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Inputs accept up to 5.5V while operating at 3.3V VCC, enabling seamless interoperation with legacy 5V logic. |
| Bushold Inputs | Eliminates external pull-up/pull-down resistors on A1–A4, reducing BOM count and PCB area in modular designs. |
| Live Insertion Support | Power-up/down high-impedance behavior prevents bus contention during hot-plug events in backplane or card-edge systems. |
| High-Drive 3-STATE Outputs | ±64mA sink/source capability allows direct driving of multiple TTL loads or terminated transmission lines. |
| Low Dynamic Noise | VOLP/VOLV specs (±0.8V) ensure minimal quiet-output switching noise, critical for mixed-signal board integrity. |
Applications
| Backplane Data Buffering | Hot-Swap I/O Expansion |
|---|---|
|
Use Scenario: Isolating and driving parallel address/data buses between a 3.3V CPU module and 5V peripheral cards in a modular rack system. IC Role / Device Role / Timing Role: Non-inverting level-shifting buffer with per-channel 3-STATE control, enabling dynamic bus arbitration. Use Value: Eliminates need for discrete level translators or bus switches while maintaining signal integrity across voltage domains. |
Use Scenario: Enabling safe insertion/removal of I/O daughter cards into an active 3.3V motherboard without disrupting bus operation. IC Role / Device Role / Timing Role: Controlled 3-STATE gate managing connection timing between card and backplane signals. Use Value: Power-up/down high-Z behavior prevents glitches or contention during card mating/unmating sequences. |
| Industrial PLC I/O Interface | TTL-Compatible Sensor Hub |
|
Use Scenario: Interfacing 3.3V microcontroller GPIOs to legacy 5V TTL-rated optocouplers and relay drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-domain translator and current booster for control signal distribution. Use Value: Delivers 64mA sink current to directly drive opto-LEDs or small relays without external transistors. |
Use Scenario: Aggregating and conditioning digital outputs from multiple 5V sensors (e.g., limit switches, encoders) into a 3.3V FPGA or MCU input bank. IC Role / Device Role / Timing Role: Input conditioner with bushold retention for intermittent or disconnected sensor lines. Use Value: Bushold function maintains known logic state on open-circuit sensor inputs, preventing spurious interrupts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-STATE buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APW | Lower drive (±24mA), no bushold, 1.65–3.6V VCC; LVTTL-compatible only (no 5V-tolerant inputs). | Suitable for pure 3.3V-only systems without legacy 5V interface requirements. | Select when cost and power efficiency outweigh 5V tolerance and bushold needs. |
| 74ALVC125MTCX | Higher speed (tPD ≤ 2.8ns), same bushold and 5V-tolerant I/O, but lower IOL (±24mA) and no live-insertion guarantee. | Better for high-frequency clock/data distribution where drive strength is secondary. | Prefer when propagation delay is critical and load currents remain below 24mA. |
Compared with SN74LVC125APW and 74ALVC125MTCX, the 74LVTH125MTCX uniquely combines 5V-tolerant inputs, bushold, and ±64mA drive - making it the only option among the three qualified for hot-swap 5V/3.3V mixed-voltage bus interfaces requiring robust floating-input handling and high-current termination.
Availability
74LVTH125MTCX is available at Aetrix Electronics and suitable for industrial PLC I/O modules, hot-swap backplane systems, and 3.3V/5V mixed-voltage sensor hubs requiring stable component supply, long-term lifecycle support, and consistent TSSOP-14 packaging.
Supply support for 74LVTH125MTCX 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
Fairchild Semiconductor was a leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.
The 74LVTH125MTCX belongs to Fairchild's LVTH (Low-Voltage TTL-High-Speed) family, engineered for 3.3V systems needing backward compatibility with 5V TTL signaling, high drive strength, and robustness in modular or hot-pluggable architectures.
FAQ
What is the maximum input voltage the 74LVTH125MTCX can tolerate on its data pins?
The 74LVTH125MTCX accepts DC input voltages from –0.5V to +7.0V on all data pins (An), with guaranteed 5.5V tolerance under normal operating conditions. This allows direct connection to 5V TTL outputs without level-shifting circuitry, a core design feature confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official datasheet.
Does the 74LVTH125MTCX require external pull-up resistors on unused inputs?
No - the 74LVTH125MTCX incorporates integrated bushold circuitry on all An inputs, which actively maintains the last valid logic state without external components. The datasheet specifies ±75µA minimum bushold drive at VI = 0.8V or 2.0V, eliminating pull-up resistors in unconnected or intermittently driven input scenarios.
What is the output drive capability of the 74LVTH125MTCX in LOW and HIGH states?
The 74LVTH125MTCX delivers +64mA sink current (IOL) at VOL ≤ 0.55V and –32mA source current (IOH) at VOH ≥ 2.0V (VCC = 3.0V). These values are specified across the full industrial temperature range and enable direct driving of multiple TTL loads or moderate-current peripherals.
Is the 74LVTH125MTCX suitable for hot-swap applications?
Yes - the 74LVTH125MTCX supports live insertion/extraction per its datasheet features, enabled by power-up/down high-impedance outputs that prevent bus contention during supply ramping. This behavior is verified in the General Description and Features sections, making it appropriate for modular backplane and card-edge systems.
What package type does the 74LVTH125MTCX use, and is it RoHS-compliant?
The 74LVTH125MTCX uses a 14-lead TSSOP package (JEDEC MO-153, 4.4mm wide, 0.65mm pitch) and is lead-free per JEDEC J-STD-020B. The ordering information section explicitly confirms all packages meet this standard, and the "X" suffix denotes tape-and-reel packaging compatible with automated SMT assembly.
74LVTH125MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74LVTH125MTCX FAQ
1.How can I place an order for 74LVTH125MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH125MTCX 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 74LVTH125MTCX reliable?
The price and inventory of 74LVTH125MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH125MTCX is usually 5 days.
3.What payment methods are accepted for 74LVTH125MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH125MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH125MTCX?
74LVTH125MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH125MTCX 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 74LVTH125MTCX?
For technical support, including 74LVTH125MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH125MTCX requirements.
6.How does Aetrix verify that 74LVTH125MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVTH125MTCX 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 74LVTH125MTCX meets industry standards.
7.What is the process for return or replacement of 74LVTH125MTCX?
All 74LVTH125MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH125MTCX, 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 74LVTH125MTCX part is unused and in its original packaging.
Return procedure for 74LVTH125MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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