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Renesas 74HCT125TELL-E
- Part No.:
- 74HCT125TELL-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
74HCT125TELL-E.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
74HCT125TELL-E from Renesas Electronics is a quad bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and signal routing in TTL- and CMOS-compatible digital systems. It operates at 4.5–5.5 V, delivers 12 ns typical propagation delay (CL = 50 pF), supports ±6 mA output drive, and features active-low 3-state control per channel for independent output enable/disable.
For engineers reviewing the 74HCT125TELL-E datasheet, 74HCT125TELL-E pinout, 74HCT125TELL-E application, or 74HCT125TELL-E equivalent, this device is selected for high-speed, low-power bus buffering in industrial control logic, microcontroller peripheral interfacing, and legacy system upgrades requiring LSTTL-level compatibility and precise 3-state timing control.
Technical Context
The 74HCT125TELL-E implements four independent non-inverting buffers, each with separate 3-state control input (C) that places the output in high-impedance when logic high - distinct from the HD74HCT126 variant where control is active-low. Its HCMOS input structure ensures 1 µA max input current and 2.0 V VIH / 0.8 V VIL thresholds across –40°C to +85°C.
Propagation delays tPLH/tPHL are symmetric at 12 ns typ (4.5 V, CL = 50 pF), while output enable/disable times (tZL/tZH/tLZ/tHZ) range from 12 ns to 38 ns over temperature, enabling predictable bus arbitration in synchronous digital subsystems without contention risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures stable operation across standard 5 V rail tolerances and brown-out immunity down to 4.5 V. |
| Propagation Delay | 12 ns typ (A→Y, VCC = 4.5 V, CL = 50 pF) - Enables reliable timing in 33 MHz+ synchronous bus environments. |
| Output Drive | ±6 mA - Sinks or sources sufficient current to drive 15 LSTTL loads directly without external buffering. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees noise margin >0.4 V against 5 V TTL logic levels. |
| Quiescent ICC | 4 µA max (Ta = 25°C) - Supports ultra-low static power in battery-backed or always-on control modules. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade deployment in factory automation and outdoor embedded equipment. |
| Off-State Leakage | ±0.5 µA max (VCC = 5.5 V) - Prevents unintended bus loading during 3-state hold, critical for multi-drop bus integrity. |
Pinout & Package
TSSOP-14 package (PTSP0014JA-B, 4.4 mm × 5.0 mm, 0.65 mm pitch), lead-free Ni/Pd/Au plating, JEDEC-compliant footprint, mass 0.05 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 3-State Control (C) | Active-high enable: logic high forces corresponding Y output into high-impedance state. |
| 2, 5, 11, 14 | Input (A) | Non-inverting data input per channel; accepts TTL- and CMOS-compatible voltage levels. |
| 3, 6, 12, 9 | Output (Y) | Buffered, 3-state output; drives bus or downstream logic only when respective C = low. |
| 7 | GND | Ground reference for all I/O and internal circuitry; requires low-impedance PCB connection. |
| 14 | VCC | Positive supply terminal; must be decoupled locally with 0.1 µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL/CMOS Input Compatibility | VIH/VIL thresholds match both 5 V TTL and CMOS families, eliminating level-shifter requirements in mixed-logic designs. |
| Independent Per-Channel 3-State Control | Four dedicated C inputs allow selective bus segment isolation without gating entire data words - essential for dynamic memory or peripheral multiplexing. |
| Low Dynamic Power Consumption | ICC static ≤ 4 µA and fast switching minimize average power in burst-mode communication interfaces. |
| High Noise Immunity | Input hysteresis and 0.4 V noise margin ensure robust operation in electrically noisy industrial enclosures. |
| JEDEC TSSOP-14 Footprint | Standardized 0.65 mm pitch enables automated assembly and compatibility with existing reflow profiles and test fixtures. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Bus Isolation |
|---|---|
Use Scenario: Adding discrete digital I/O modules to programmable logic controllers using shared backplane buses. IC Role / Device Role / Timing Role: Bidirectional buffer isolating CPU address/data lines from field-side I/O drivers while enabling hot-swap-safe 3-state control. Use Value: Prevents bus contention during module insertion/removal and maintains signal integrity across 1 m backplane traces at 20 MHz. | Use Scenario: Interfacing multiple SPI or parallel peripherals (e.g., ADCs, displays, EEPROMs) to an MCU with limited GPIO count. IC Role / Device Role / Timing Role: Output-enable-gated bus driver allowing one MCU port to serve multiple devices via time-multiplexed access. Use Value: Eliminates need for discrete MOSFET switches or complex software-controlled tristate sequencing - reduces BOM and firmware overhead. |
| Legacy System Logic Upgrade | Test Equipment Signal Routing |
Use Scenario: Replacing obsolete 74LS125 in aging instrumentation control boards requiring extended temperature support. IC Role / Device Role / Timing Role: Pin-compatible TTL-buffer upgrade delivering identical logic function with lower power and wider VCC tolerance. Use Value: Extends product lifecycle without PCB redesign; supports operation down to –40°C in unheated lab environments. | Use Scenario: Automated test fixture routing of stimulus signals between DUT ports and measurement instruments. IC Role / Device Role / Timing Role: Controlled-path signal gate enabling sequential activation of test channels under microcontroller command. Use Value: Reduces crosstalk and ground bounce by ensuring only one signal path is active at any time - improves measurement repeatability ±0.5%. |
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 |
|---|---|---|---|
| SN74HCT125D | SOP-14 package (7.5 mm × 5.5 mm); identical electrical specs and pinout; same 4.5–5.5 V operation and 12 ns tPD. | Larger footprint and higher thermal mass - suitable for manual prototyping or legacy board layouts with SOP-14 pads. | Select SN74HCT125D if TSSOP assembly capability is unavailable or if thermal derating above 70°C is required. |
| 74VHC125FT | Lower VCC range (2–5.5 V); 3.5 ns tPD typ; higher VIH (3.5 V min) - incompatible with 5 V TTL input levels. | Not interoperable with LSTTL sources; requires level-shifting or redesign when replacing 74HCT125TELL-E in existing 5 V systems. | Choose 74VHC125FT only for new low-voltage (3.3 V) designs prioritizing speed over TTL compatibility. |
Compared with SN74HCT125D and 74VHC125FT, the 74HCT125TELL-E provides optimal balance of industrial temperature range, TTL-level compatibility, compact TSSOP packaging, and proven reliability in long-lifecycle embedded systems - making it the preferred choice for drop-in replacement and space-constrained deployments.
Availability
74HCT125TELL-E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral bus isolation, and legacy system logic upgrades requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 74HCT125TELL-E 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The HD74HCT series was developed specifically for industrial-grade 5 V digital logic interfacing, emphasizing robustness, wide temperature operation, and seamless integration with legacy TTL systems.
FAQ
What is the logic configuration of the 74HCT125TELL-E?
The 74HCT125TELL-E contains four independent non-inverting bus buffers, each with a dedicated active-high 3-state control input (C). When C is high, the corresponding Y output enters high-impedance; when C is low, Y follows A. This differs from the HD74HCT126, which uses active-low control.
Does the 74HCT125TELL-E support 3.3 V logic inputs?
No - the 74HCT125TELL-E requires VCC = 4.5–5.5 V and has VIH = 2.0 V min, VIL = 0.8 V max. While 3.3 V logic may meet VIH threshold, it violates recommended operating conditions and risks marginal noise immunity; use level shifters for 3.3 V interface.
What is the maximum capacitive load the 74HCT125TELL-E can drive reliably?
The 74HCT125TELL-E is characterized up to CL = 50 pF for timing specs (e.g., 12 ns tPD). Driving >50 pF increases propagation delay and rise/fall times nonlinearly; for >100 pF loads, add series termination or buffer staging to maintain signal integrity.
Is the 74HCT125TELL-E pin-compatible with the 74LS125?
Yes - the 74HCT125TELL-E matches the 74LS125 pinout (TSSOP-14 vs. DIP-14 mechanical difference aside) and provides identical logic functionality. Electrical differences include higher noise immunity, lower ICC, and guaranteed operation down to –40°C.
What is the thermal resistance (θJA) of the 74HCT125TELL-E in its TSSOP-14 package?
Renesas does not publish θJA for the 74HCT125TELL-E in the REJ03D0657-0300 datasheet. For thermal design, assume worst-case power dissipation of 500 mW (absolute max) and use PCB copper area per JEDEC standards; typical θJA for TSSOP-14 on 2-layer board is ~200°C/W.
74HCT125TELL-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74HCT
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HCT125TELL-E FAQ
1.How can I place an order for 74HCT125TELL-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT125TELL-E 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 74HCT125TELL-E reliable?
The price and inventory of 74HCT125TELL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT125TELL-E is usually 5 days.
3.What payment methods are accepted for 74HCT125TELL-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT125TELL-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT125TELL-E?
74HCT125TELL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT125TELL-E 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 74HCT125TELL-E?
For technical support, including 74HCT125TELL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT125TELL-E requirements.
6.How does Aetrix verify that 74HCT125TELL-E is sourced from the original manufacturer or authorized distributors?
All 74HCT125TELL-E 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 74HCT125TELL-E meets industry standards.
7.What is the process for return or replacement of 74HCT125TELL-E?
All 74HCT125TELL-E units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT125TELL-E, 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 74HCT125TELL-E part is unused and in its original packaging.
Return procedure for 74HCT125TELL-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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