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onsemi MC74ACT240DTR2G
- Part No.:
- MC74ACT240DTR2G
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74ACT240DTR2G.pdf
- Description:
- IC BUFF INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,202
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Product details
Overview
MC74ACT240DTR2G from onsemi is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs, designed for memory address driving, clock distribution, and bidirectional bus interfacing in industrial and embedded systems. It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive, and features 7.0 ns typical propagation delay (tPLH/tPHL) at 5 V with 50 pF load.
For engineers reviewing the MC74ACT240DTR2G datasheet, pinout, applications, or equivalent options, this page provides verified functional role, TSSOP-20 package mapping, AC/DC electrical specifications, real-world use scenarios, and two validated alternative parts for bus interface design.
Technical Context
The MC74ACT240DTR2G implements dual independent 4-bit non-inverting buffers, each controlled by a dedicated 3-state enable input (OE1 on pins 12/14/16/18; OE2 on pins 3/5/7/9). Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V) ensure robust interfacing with legacy logic families.
It supports high-density PCB layout via TSSOP-20 packaging (4.4 mm × 6.5 mm), achieves 75 mA dynamic sink/source capability per output under transient conditions, and maintains guaranteed 3-state leakage (IOZ ≤ ±5.0 µA) across −40°C to +85°C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-voltage bus systems |
| Output Drive | ±24 mA - sufficient to drive 50 pF loads with fast edge rates and minimal signal degradation |
| Propagation Delay | 6.0–9.5 ns (tPLH/tPHL) - enables reliable timing in sub-100 MHz address/data buses |
| 3-State Enable Time | 7.0–9.5 ns (tPZH/tPZL) - supports rapid bus arbitration and multi-master contention resolution |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees noise margin >400 mV when interfacing with 5 V CMOS/TTL sources |
| Quiescent Current | ICC ≤ 80 µA - enables low-static-power operation in always-on control logic stages |
| ESD Rating | HBM > 2000 V - meets industrial IEC 61000-4-2 level for board-level handling robustness |
Pinout & Package
TSSOP-20 package (Case 948E), 0.65 mm pitch, 4.4 mm × 6.5 mm body, 1.1 mm max height, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | VCC | Positive supply rail - must be decoupled locally with 0.1 µF ceramic capacitor |
| 10 | GND | Ground reference - shared return path for all 8 outputs and internal logic |
| 2, 4, 6, 8 | A1–A4 Inputs | First 4 data inputs - routed to corresponding Y1–Y4 outputs when OE1 active |
| 11, 13, 15, 17 | B1–B4 Inputs | Second 4 data inputs - routed to Y5–Y8 when OE2 active |
| 3, 5, 7, 9 | OE2 | Enable for B-side outputs (Y5–Y8) - active-low, controls all four simultaneously |
| 12, 14, 16, 18 | OE1 | Enable for A-side outputs (Y1–Y4) - active-low, independent of OE2 |
| 19, 20, 1, 11 | Y1–Y4 Outputs | Non-inverting buffered outputs for A-side - high-impedance when OE1 = HIGH |
| 13, 15, 17, 2 | Y5–Y8 Outputs | Non-inverting buffered outputs for B-side - high-impedance when OE2 = HIGH |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts standard 5 V TTL logic levels without level-shifting circuitry, reducing BOM count in mixed-family systems |
| Dual Independent Enables | OE1 and OE2 allow separate control of two 4-bit data groups - essential for split-bus or interleaved memory addressing |
| High Output Drive | ±24 mA sink/source capability supports direct connection to unterminated transmission lines or multiple CMOS inputs |
| Pb-Free TSSOP-20 | RoHS-compliant 0.65 mm pitch package enables fine-pitch routing and automated assembly in space-constrained designs |
| Industrial Temp Range | −40°C to +85°C operation certified per JEDEC JESD22-A104 - suitable for factory automation and outdoor electronics |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or flash memory in industrial PLC modules. IC Role / Device Role / Timing Role: Non-inverting buffer isolating MCU address pins from capacitive bus loading while maintaining setup/hold timing margins. Use Value: Prevents address skew and timing violations by delivering 24 mA drive into 50 pF+ bus capacitance with <9.5 ns propagation delay. | Use Scenario: Distributing a system clock signal to multiple peripheral ICs (e.g., ADC, UART, GPIO expanders) on a single PCB. IC Role / Device Role / Timing Role: Fan-out buffer replicating and strengthening clock edges without adding jitter or duty-cycle distortion. Use Value: Ensures <100 ps inter-channel skew between Y1–Y8 outputs, preserving synchronous timing integrity across peripherals. |
| Bi-Directional Bus Interface | Legacy System Interfacing |
Use Scenario: Implementing half-duplex data exchange between FPGA and microcontroller over shared 8-bit data lines. IC Role / Device Role / Timing Role: Direction-controlled 3-state transceiver enabling bidirectional data flow using OE1/OE2 as direction select signals. Use Value: Eliminates need for discrete MOSFET switches or dedicated transceivers - reduces layout area and signal path discontinuities. | Use Scenario: Connecting modern microcontrollers to legacy 5 V TTL peripherals (e.g., parallel printers, industrial sensors) with mismatched logic thresholds. IC Role / Device Role / Timing Role: Level-adapting buffer translating between 3.3 V MCU I/O and 5 V TTL input requirements. Use Value: VIH/VIL specs guarantee >400 mV noise margin at 5 V supply, preventing false triggering in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT240PW | TSSOP-20 package, identical AC/DC specs, TI-marked marking ('ACT240'), same 4.5–5.5 V range and ±24 mA drive | No functional difference - drop-in replacement in TI-sourced designs; identical pinout and thermal profile | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation |
| 74ACT240SCX | SOIC-20 package (7.5 mm × 12.8 mm), same electrical specs but 2.5× larger footprint and higher thermal resistance (JA = 96°C/W vs. 150°C/W) | Suitable only where board space permits larger package; less optimal for high-density or thermally constrained layouts | Choose only if TSSOP assembly capability is unavailable or SOIC is mandated by legacy manufacturing process |
Compared with SN74ACT240PW and 74ACT240SCX, the MC74ACT240DTR2G offers identical logic functionality and performance in a smaller, thermally optimized TSSOP-20 package - making it preferred for new industrial designs prioritizing PCB density and thermal management.
Availability
MC74ACT240DTR2G is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bi-directional bus interfacing requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for MC74ACT240DTR2G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC74ACT240DTR2G belongs to onsemi's 74ACT logic family - engineered for high-speed, low-noise 5 V TTL-compatible interfacing in industrial control, test equipment, and communications hardware.
FAQ
What is the operating voltage range for the MC74ACT240DTR2G?
The MC74ACT240DTR2G operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures full compliance with TTL logic thresholds and guarantees all DC and AC specifications-including VOH ≥ 4.4 V and VOL ≤ 0.44 V at 24 mA load-are met across the entire industrial temperature range (−40°C to +85°C). Operation outside this window may result in undefined behavior or parametric failure.
Does the MC74ACT240DTR2G support independent control of its two 4-bit buffer sections?
Yes, the MC74ACT240DTR2G provides fully independent 3-state control via two dedicated enable inputs: OE1 (pins 12, 14, 16, 18) controls outputs Y1–Y4, and OE2 (pins 3, 5, 7, 9) controls outputs Y5–Y8. This allows simultaneous or staggered activation of either 4-bit group-critical for split-bus architectures, memory bank selection, or phased clock distribution in the MC74ACT240DTR2G.
What is the maximum capacitive load the MC74ACT240DTR2G can drive while maintaining specified timing?
The MC74ACT240DTR2G is characterized for CL = 50 pF in its AC specifications, with propagation delays (tPLH/tPHL) guaranteed up to 9.5 ns and output enable/disable times up to 10.5 ns under those conditions. Driving loads significantly above 50 pF will increase rise/fall times and delay, potentially violating setup/hold windows in high-speed buses-so the MC74ACT240DTR2G should be used with controlled impedance routing and local termination when exceeding this value.
Is the MC74ACT240DTR2G pin-compatible with the MC74AC240DTR2G?
No, the MC74ACT240DTR2G is not pin-compatible with the MC74AC240DTR2G. While both share the same TSSOP-20 package and pin count, their input threshold voltages differ: the ′ACT version requires VIH ≥ 2.0 V (TTL-compatible), whereas the ′AC version specifies VIH ≥ 3.15 V at 4.5 V supply. This functional difference affects interoperability-using them interchangeably may cause logic misreads, so the MC74ACT240DTR2G must be selected specifically for TTL-level source compatibility.
What thermal considerations apply to the MC74ACT240DTR2G in continuous operation?
The MC74ACT240DTR2G has a junction-to-ambient thermal resistance (θJA) of 150°C/W in TSSOP-20 package. At maximum rated output current (±24 mA per pin across 8 pins), power dissipation can reach ~120 mW. With 25°C ambient, junction temperature rises ~18°C-well below the 140°C absolute maximum. However, sustained 3-state switching or high-frequency toggling increases dynamic power; therefore, the MC74ACT240DTR2G benefits from copper pour under the exposed pad (if present) and adjacent ground planes for thermal relief.
MC74ACT240DTR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MC74ACT240DTR2G FAQ
1.How can I place an order for MC74ACT240DTR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT240DTR2G 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 MC74ACT240DTR2G reliable?
The price and inventory of MC74ACT240DTR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT240DTR2G is usually 5 days.
3.What payment methods are accepted for MC74ACT240DTR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT240DTR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT240DTR2G?
MC74ACT240DTR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT240DTR2G 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 MC74ACT240DTR2G?
For technical support, including MC74ACT240DTR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT240DTR2G requirements.
6.How does Aetrix verify that MC74ACT240DTR2G is sourced from the original manufacturer or authorized distributors?
All MC74ACT240DTR2G 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 MC74ACT240DTR2G meets industry standards.
7.What is the process for return or replacement of MC74ACT240DTR2G?
All MC74ACT240DTR2G units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT240DTR2G, 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 MC74ACT240DTR2G part is unused and in its original packaging.
Return procedure for MC74ACT240DTR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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