My Inquiry
My Account
STMicroelectronics M74HC240RM13TR
- Part No.:
- M74HC240RM13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HC240RM13TR.pdf
- Description:
- IC BUFFER INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,503
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M74HC240RM13TR from STMicroelectronics is an octal 3-state inverting bus buffer IC designed for bidirectional data bus isolation and address/data line driving in memory and peripheral interfaces. It features 20-pin TSSOP package, 2V–6V supply range, 10ns typical propagation delay at 6V, ±6mA output drive, and dual independent 4-bit groups controlled by separate active-low enable inputs (1G, 2G).
For engineers reviewing the M74HC240RM13TR datasheet, M74HC240RM13TR pinout, M74HC240RM13TR application, or M74HC240RM13TR equivalent, key selection criteria include 3-state output timing symmetry, high noise immunity (28% VCC), low quiescent current (4µA max), and compatibility with legacy 74-series logic systems.
Technical Context
The M74HC240RM13TR implements two independent 4-bit inverting buffer sections, each with dedicated active-low output enable (1G/2G). Inputs and outputs are fully buffered with silicon gate C2MOS technology, enabling rail-to-rail operation and robust ESD protection.
Its symmetrical tPLH/tPHL delays and matched |IOH|/IOL drive ensure minimal skew in bus arbitration and address latching. The device operates across industrial temperature range (−55°C to +125°C) with guaranteed DC specs at VCC = 2V, 4.5V, and 6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V microcontrollers driving 5V peripherals) |
| Propagation Delay (tPD) | 10ns (typ.) at VCC = 6V - enables reliable operation in 50MHz+ address/data strobe paths |
| Output Drive Strength | ±6mA (min.) - sufficient to drive 50pF loads with <23ns AC delay over full temp range |
| Quiescent Current (ICC) | 4µA (max.) at TA = 25°C - critical for low-power standby modes in battery-backed systems |
| Noise Immunity | VNIH/VNIL = 28% VCC (min.) - rejects >1.4V noise on 5V buses without false triggering |
| Operating Temperature | −55°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Input Capacitance | 5pF (max.) - minimizes loading on upstream drivers and preserves signal edge integrity |
Pinout & Package
Package: 20-lead TSSOP (Thin Shrink Small Outline Package), 6.4mm × 6.5mm body, 0.65mm pitch, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G / 2G - Active-Low Output Enable | Independent gating of two 4-bit inverting buffer banks; low enables outputs, high forces high-impedance state |
| 2,4,6,8 / 11,13,15,17 | 1A1–1A4 / 2A1–2A4 - Data Inputs | Inverting inputs for respective output banks; compatible with TTL and CMOS logic thresholds |
| 3,5,7,9 / 12,14,16,18 | 1Y1–1Y4 / 2Y1–2Y4 - Inverted Outputs | 3-state outputs with symmetrical sourcing/sinking capability; Z-state entered within 32ns (tPLZ) of enable deassertion |
| 10 | GND | Dedicated ground reference for noise suppression and stable switching thresholds |
| 20 | VCC | Single positive supply input; decoupling capacitor required within 1cm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS240 | Direct drop-in replacement for legacy TTL-based bus buffers without redesign |
| High noise immunity (28% VCC) | Ensures reliable operation in electrically noisy industrial PLC backplanes and motor drive controllers |
| Balanced propagation delays (tPLH ≅ tPHL) | Minimizes duty cycle distortion in clocked bus applications such as synchronous SRAM access |
| Low power dissipation (4µA ICC max) | Reduces thermal load in dense PCB layouts and extends battery life in portable instrumentation |
| Wide voltage range (2V–6V) | Supports interoperability between 2.5V FPGAs, 3.3V microcontrollers, and 5V legacy peripherals |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-noise CAN/LIN transceiver address/data lines. IC Role / Device Role / Timing Role: 3-state inverting buffer providing bidirectional bus separation and noise-suppressed signal translation. Use Value: Prevents cross-talk during simultaneous read/write cycles; enables hot-swap-safe peripheral insertion via controlled Z-state entry. | Use Scenario: Driving multiplexed LED display segments and relay driver arrays from a 3.3V MCU in harsh ambient conditions. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer with fail-safe high-impedance shutdown on reset. Use Value: Delivers 6mA per segment at 5V while maintaining <10ns timing margin for 1kHz multiplexing refresh rates. |
| Legacy Memory Expansion Interface | Test Equipment Signal Routing Matrix |
Use Scenario: Buffering address lines between a 6502 CPU and external EPROM/RAM chips on retro-computing expansion cards. IC Role / Device Role / Timing Role: Inverting address latch driver with precise tPLH/tPHL matching to meet 2MHz bus setup/hold windows. Use Value: Eliminates timing skew-induced read errors; supports direct interface to 5V TTL memory without level shifters. | Use Scenario: Configurable signal path selection in automated test fixtures using FPGA-controlled enable lines. IC Role / Device Role / Timing Role: Reconfigurable 8-channel signal gate with sub-35ns enable/disable transitions for dynamic routing. Use Value: Enables <100ns reconfiguration latency between DUT stimulus/response channels without signal corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC240N | DIP-20 package; higher COUT (10pF vs. 8pF); 125°C max operating temp only | Suitable for prototyping and through-hole assembly; not recommended for high-density TSSOP layouts | Select when manual soldering or breadboard validation is required |
| 74VHC240M | Faster tPD (7.5ns typ. at 5V); lower ICC (2µA); narrower VCC range (2V–5.5V) | Better for 3.3V-only systems with tight timing budgets; incompatible with 6V legacy rails | Select when optimizing for speed/power in modern low-voltage designs |
Compared with SN74HC240N and 74VHC240M, the M74HC240RM13TR uniquely balances wide voltage support (2–6V), industrial temperature rating (−55°C to +125°C), and TSSOP footprint-making it optimal for automotive and industrial upgrades where legacy voltage compatibility and space constraints coexist.
Availability
M74HC240RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, legacy memory expansion systems, and automated test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for M74HC240RM13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications including AEC-Q100 and ISO/TS 16949.
The M74HC240RM13TR belongs to ST's high-speed CMOS logic family, engineered specifically for robust, low-power bus interfacing in mission-critical industrial and automotive control systems.
FAQ
What is the maximum capacitive load this device can drive reliably?
The M74HC240RM13TR is characterized for CL = 50pF and 150pF loads in AC testing. With ±6mA output drive and 10ns typical propagation delay at 6V, it reliably drives up to 100pF loads while maintaining <25ns transition times and meeting setup/hold margins for 20MHz bus operation.
Does this part support hot-swap or live-insertion into powered systems?
Yes - all inputs feature integrated protection circuits against static discharge and transient overvoltage. When powered, the device enters high-impedance state upon G-input assertion before power-up sequencing completes, preventing bus contention during live insertion into backplane systems.
How does the dual-enable architecture improve system-level reliability?
The independent 1G and 2G enables allow separate control of two 4-bit data paths - enabling staggered bus arbitration, fault-isolated peripheral activation, and reduced ground bounce versus single-enable octal buffers. This architecture prevents simultaneous switching noise from corrupting adjacent signal groups.
Is there a non-inverting version of this device in the same package?
Yes - the M74HC244RM13TR is the functional complement: octal 3-state non-inverting buffer in identical TSSOP-20 package, with matching electrical specs (VCC range, drive strength, timing, temperature range) and pinout compatibility except for inversion logic.
M74HC240RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
M74HC240RM13TR FAQ
1.How can I place an order for M74HC240RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC240RM13TR 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 M74HC240RM13TR reliable?
The price and inventory of M74HC240RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC240RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC240RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC240RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC240RM13TR?
M74HC240RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC240RM13TR 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 M74HC240RM13TR?
For technical support, including M74HC240RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC240RM13TR requirements.
6.How does Aetrix verify that M74HC240RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC240RM13TR 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 M74HC240RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC240RM13TR?
All M74HC240RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC240RM13TR, 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 M74HC240RM13TR part is unused and in its original packaging.
Return procedure for M74HC240RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M74HC240RM13TR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
