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onsemi MM74HCT245SJX
- Part No.:
- MM74HCT245SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MM74HCT245SJX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
MM74HCT245SJX from onsemi is an octal 3-state bidirectional transceiver in SOIC-20 WB package, designed for asynchronous two-way data bus communication between TTL/NMOS and CMOS systems. It features TTL-compatible inputs, 6 mA minimum output drive, 16 ns typical propagation delay, and operates over –55°C to +125°C with 4.5–5.5 V supply.
For engineers reviewing the MM74HCT245SJX datasheet, pinout, applications, or equivalent options, key selection factors include direction control (DIR) logic polarity, active-low enable (G), 3-state isolation timing (tPZL/tPLZ ≤40 ns), and compatibility with LS-TTL load driving (up to 15 units).
Technical Context
The MM74HCT245SJX implements a dual-rail CMOS transceiver architecture with separate DIR and G control lines enabling deterministic data flow directionality: DIR = HIGH enables A→B transfer; DIR = LOW enables B→A transfer. Its 3-state outputs are fully isolated when G = HIGH, with leakage current ≤±5 µA across full temperature range.
It uses advanced silicon-gate CMOS process to achieve TTL-level input thresholds (VIH ≥2.0 V, VIL ≤0.8 V) while maintaining low quiescent ICC ≤160 µA and high-speed switching (tPHL/tPLH ≤29 ns at CL = 50 pF, TA = –40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - ensures interoperability with standard 5 V TTL/CMOS buses without level shifting |
| Propagation Delay | 16 ns typical (CL = 45 pF) - supports >30 MHz bus toggle rates in minimal-load configurations |
| Output Drive | 6 mA min sink/source - drives up to 15 LS-TTL loads directly, eliminating need for buffer fanout stages |
| 3-State Enable/Disable | tPZL ≤40 ns, tPLZ ≤25 ns - guarantees fast bus arbitration and prevents contention during direction switching |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and automotive under-hood applications |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches TTL logic levels, enabling direct interface with legacy 74LS components |
| Quiescent Current | ICC ≤160 µA - reduces standby power in battery-backed or energy-sensitive bus systems |
Pinout & Package
MM74HCT245SJX is housed in a 20-pin SOIC wide-body (Case 751D-05) package measuring 12.8 mm × 7.5 mm × 2.5 mm, with 1.27 mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Active-low Output Enable | When HIGH, all outputs enter high-impedance state; required for bus sharing and multi-driver arbitration |
| 2–9 (A1–A8) | Bus A Inputs/Outputs | Bidirectional I/O port connected to first data bus; direction determined by DIR and G states |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; must be low-inductance connection |
| 11–18 (B1–B8) | Bus B Inputs/Outputs | Bidirectional I/O port connected to second data bus; complements A-side for full-duplex bus bridging |
| 19 (DIR) | Direction Control | HIGH enables A→B data flow; LOW enables B→A flow - determines signal routing path through transceiver core |
| 20 (VCC) | Power Supply | +5 V nominal supply rail; decoupling capacitor (0.1 µF) required within 10 mm of pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard 5 V TTL voltage thresholds (VIH ≥2.0 V, VIL ≤0.8 V), enabling plug-in replacement of 74LS245 without redesign |
| High-output drive capability | 6 mA minimum sink/source per output supports direct loading of 15 LS-TTL inputs, reducing external buffering needs |
| Low-power CMOS operation | 160 µA max ICC at 25°C allows use in thermally constrained or low-quiescent-power systems without thermal derating |
| Wide temperature range | Specified from –55°C to +125°C meets MIL-PRF-38535 Class B and AEC-Q100 Grade 1 requirements for harsh environments |
| Fast 3-state switching | tPZL ≤40 ns / tPLZ ≤25 ns ensures rapid bus release and acquisition, critical for time-critical arbitration protocols |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Bridge |
|---|---|
Use Scenario: Isolating and translating data between CPU-local memory bus and distributed I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver managing synchronous read/write cycles across modular backplane segments with precise 3-state timing control. Use Value: Enables hot-swap-capable slot insertion via fast tPLZ ≤25 ns disable time, preventing bus contention during module insertion/removal. | Use Scenario: Interfacing microcontroller CAN subsystem with discrete sensor/actuator sub-buses in vehicle body electronics. IC Role / Device Role / Timing Role: Direction-controlled data bridge synchronizing LIN or PWM peripheral reads with main MCU bus cycles using DIR-driven flow control. Use Value: Eliminates need for separate unidirectional buffers and direction logic gates, reducing component count and PCB area by 40% vs discrete solutions. |
| Legacy Instrumentation TTL-to-CMOS Adapter | Test Equipment Digital Pattern Generator Interface |
Use Scenario: Upgrading aging benchtop test instruments with modern low-power microcontrollers while retaining original TTL-based front-panel displays and switches. IC Role / Device Role / Timing Role: Level-shifting and bus-driving transceiver translating 3.3 V MCU outputs to 5 V TTL-compatible signals for display drivers and keypad scanners. Use Value: Maintains full timing compliance (tPHL ≤29 ns) with legacy 74LS timing budgets, avoiding redesign of firmware timing loops or added wait states. | Use Scenario: Connecting FPGA-based pattern generators to DUTs requiring precise 5 V logic-level stimulus with configurable data direction and bus hold. IC Role / Device Role / Timing Role: Programmable-direction bus interface providing controlled signal launch and capture windows via synchronized G and DIR assertion. Use Value: Supports <10 ns edge alignment tolerance via matched tPHL/tPLH (≤29 ns) and low COUT (25 pF), minimizing skew in parallel digital stimulus paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245N | Same logic function, identical AC/DC specs, but in PDIP-20 package (longer lead length, higher inductance) | Preferred for through-hole prototyping or legacy board rework where SOIC footprint unavailable | Select SN74HCT245N only when manual assembly or socket-based testing is required; MM74HCT245SJX offers superior high-frequency performance due to lower package parasitics |
| 74VHC245FT | Higher speed (tPD ≤7.5 ns), wider VCC range (2–5.5 V), but lower drive (±8 mA) and no guaranteed –55°C operation | Suitable for 3.3 V mixed-voltage systems or consumer-grade equipment with tighter timing margins | Choose 74VHC245FT only if 3.3 V operation or sub-10 ns timing is mandatory; MM74HCT245SJX remains optimal for industrial 5 V bus integrity and extended temperature reliability |
Compared with SN74HCT245N and 74VHC245FT, the MM74HCT245SJX delivers best-in-class thermal robustness (–55°C to +125°C), proven bus-drive margin (6 mA min), and SOIC-20 WB mechanical stability for automated SMT production - making it the preferred choice for mission-critical industrial and automotive bus interfaces.
Availability
MM74HCT245SJX is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy instrumentation upgrades, and test equipment digital interfaces requiring stable component supply and long-term obsolescence management.
Supply support for MM74HCT245SJX 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MM74HCT245SJX belongs to the 74HCT logic family, engineered specifically to provide TTL-compatible interfacing with CMOS power efficiency - targeting legacy system upgrades, industrial bus bridging, and mixed-technology board designs.
FAQ
What is the pin configuration and function of the MM74HCT245SJX?
The MM74HCT245SJX has 20 pins in SOIC-20 WB package: Pins 2–9 are bidirectional A-bus terminals, pins 11–18 are B-bus terminals, pin 1 is active-low Output Enable (G), pin 19 is Direction Control (DIR), pin 10 is GND, and pin 20 is VCC. The MM74HCT245SJX uses these to implement deterministic A↔B data flow with 3-state isolation when G is HIGH.
Does the MM74HCT245SJX support operation at 3.3 V supply?
No, the MM74HCT245SJX is specified only for 4.5–5.5 V operation per its Recommended Operating Ranges table. It lacks guaranteed functionality below 4.5 V; attempting 3.3 V operation may result in marginal VIH/VIL margins and undefined 3-state behavior. For 3.3 V systems, consider 74VHC245FT instead.
What is the maximum capacitive load the MM74HCT245SJX can drive reliably?
The MM74HCT245SJX is characterized up to 150 pF load capacitance in AC Electrical Characteristics, with tPHL/tPLH ≤45 ns at CL = 150 pF and TA = –55°C to +125°C. Driving beyond 150 pF risks violating propagation delay specs and increasing ground bounce; external series termination or buffer staging is recommended above this limit.
How does the MM74HCT245SJX handle static discharge protection?
The MM74HCT245SJX integrates diode-based ESD protection on all inputs, clamping to VCC and GND per Absolute Maximum Ratings. Each input withstands ±20 mA clamp current, supporting human-body-model (HBM) ESD immunity per JEDEC JS-001, though external TVS devices are still advised for board-level surge protection in industrial environments.
Is the MM74HCT245SJX pin-compatible with the SN74HCT245N?
Yes, the MM74HCT245SJX and SN74HCT245N share identical pin functions and logic behavior, but differ in package: MM74HCT245SJX uses SOIC-20 WB (751D-05), while SN74HCT245N uses PDIP-20. Their pinouts match electrically, but mechanical mounting and thermal performance differ significantly due to package construction.
MM74HCT245SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.2mA, 7.2mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
MM74HCT245SJX FAQ
1.How can I place an order for MM74HCT245SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for MM74HCT245SJX 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 MM74HCT245SJX reliable?
The price and inventory of MM74HCT245SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HCT245SJX is usually 5 days.
3.What payment methods are accepted for MM74HCT245SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HCT245SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM74HCT245SJX?
MM74HCT245SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM74HCT245SJX 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 MM74HCT245SJX?
For technical support, including MM74HCT245SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HCT245SJX requirements.
6.How does Aetrix verify that MM74HCT245SJX is sourced from the original manufacturer or authorized distributors?
All MM74HCT245SJX 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 MM74HCT245SJX meets industry standards.
7.What is the process for return or replacement of MM74HCT245SJX?
All MM74HCT245SJX units undergo pre-shipment inspection (PSI). If there is an issue with MM74HCT245SJX, 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 MM74HCT245SJX part is unused and in its original packaging.
Return procedure for MM74HCT245SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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