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onsemi MC74LCX245DWR2
- Part No.:
- MC74LCX245DWR2
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74LCX245DWR2.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,433
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Product details
Overview
MC74LCX245DWR2 from onsemi is a low-voltage CMOS octal transceiver with 5 V-tolerant inputs/outputs, non-inverting bidirectional data flow, 1.65–5.5 V supply operation, 24 mA output drive at VCC = 3.0 V, and 3-state control via OE and T/R pins. It enables level-shifting and bus isolation in mixed-voltage memory and peripheral interfaces.
For engineers reviewing the MC74LCX245DWR2 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-20WB package details, direction-control logic behavior, and real-world interface compatibility for 1.8 V/2.5 V/3.3 V to 5 V system interconnects.
Technical Context
The MC74LCX245DWR2 implements a dual-bus, non-inverting transceiver architecture where the T/R input selects data direction (A→B when HIGH, B→A when LOW), while OE independently places both ports into high-impedance state. Its 5 V-tolerant I/O allows safe interfacing with legacy 5 V TTL logic even when VCC is as low as 1.65 V.
It features IOFF protection ensuring high-impedance outputs during power-down (VCC = 0 V), near-zero static ICC (≤10 µA in all logic states), and LVTTL/LVCMOS compatibility across its full operating range. Propagation delay is ≤7.0 ns at VCC = 3.0–3.6 V, with output skew ≤1.0 ns between any two switching outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - supports direct integration into 1.8 V, 2.5 V, 3.3 V, and 5 V systems without level shifters |
| Input Voltage Tolerance | −0.5 V to +6.5 V - enables safe connection to 5 V drivers regardless of VCC (e.g., VCC = 2.5 V) |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50 Ω transmission lines or multiple LVTTL loads |
| Propagation Delay | ≤7.0 ns (VCC = 3.0–3.6 V) - ensures timing compliance in high-speed address/data bus applications |
| Quiescent Supply Current | ≤10 µA in all three logic states - minimizes standby power in battery-backed or always-on subsystems |
| IOFF Leakage | ≤10 µA at VI = 5.5 V or VO = 5.5 V with VCC = 0 V - prevents back-powering or signal corruption during hot-swap |
| ESD Rating (HBM) | >2000 V - meets industrial handling requirements without external protection |
Pinout & Package
MC74LCX245DWR2 is packaged in SOIC-20 Wide Body (Case 751D-05), 12.8 mm × 7.5 mm, 1.27 mm pitch, Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | T/R | Transmit/Receive control: HIGH = A→B data flow; LOW = B→A data flow |
| 2–9 | A0–A7 | Side-A bidirectional I/O: connected to local bus or microcontroller port |
| 10 | GND | Ground reference for all internal circuitry and I/O |
| 11–18 | B0–B7 | Side-B bidirectional I/O: connected to external bus, memory, or peripheral |
| 19 | OE | Output Enable: HIGH disables both A and B ports (3-state); LOW enables transceiver operation |
| 20 | VCC | Positive supply rail: powers internal logic and defines output voltage levels |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant I/O | Enables seamless interface between 1.65–3.3 V logic and legacy 5 V TTL without external translators |
| IOFF protection | Guarantees high-impedance outputs during power-off, preventing back-driving and bus contention |
| LVTTL/LVCMOS compatibility | Meets VIH/VIL thresholds for both families across full VCC range, simplifying mixed-logic design |
| 24 mA balanced drive | Supports fan-out of ≥10 LVTTL loads or termination of short PCB traces without buffering |
| Low dynamic switching noise | VOLP ≤ 0.8 V and VOLV ≥ −0.8 V (VCC = 3.3 V, CL = 50 pF) reduce ground bounce and crosstalk |
Applications
| Memory Address Driving | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Driving address lines from a 3.3 V microcontroller to a 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver enabling A→B address propagation and B→A status feedback. Use Value: Eliminates need for discrete level shifters while maintaining <7 ns propagation delay for timing-critical address setup. |
Use Scenario: Extending an MCU's GPIO port to control multiple peripherals on a shared 5 V I/O bus. IC Role / Device Role / Timing Role: Direction-controlled bus buffer isolating MCU core from bus loading and voltage mismatch. Use Value: Enables safe hot-plug of peripherals via IOFF and 5 V tolerance, with OE-gated isolation during reconfiguration. |
| Industrial Control Backplane | Legacy System Interface Adapter |
Use Scenario: Interfacing a modern 1.8 V FPGA I/O bank to a 5 V PLC backplane with TTL signaling. IC Role / Device Role / Timing Role: Voltage-agile transceiver managing bidirectional data exchange under real-time scan-cycle constraints. Use Value: Delivers deterministic ≤7 ns latency and ±24 mA drive to meet IEC 61131-3 cycle time budgets without added jitter. |
Use Scenario: Retrofitting a discontinued 5 V transceiver in a medical device mainboard with a lower-power, wider-VCC alternative. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement preserving existing layout and timing margins. Use Value: Maintains identical SOIC-20WB footprint and truth table while reducing quiescent current by >99% versus older 74ACT series. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower max VCC (3.6 V), no 5 V tolerance on inputs; IOFF not specified; 24 mA drive only at VCC ≥ 2.7 V | Suitable only in fully 3.3 V systems; cannot replace MC74LCX245DWR2 in mixed 5 V/3.3 V interfaces | Select when cost is primary and 5 V tolerance is unnecessary; verify VIH/VIL margins at lowest VCC. |
| 74LVX245M | Same 1.65–3.6 V range and 5 V tolerance, but only 12 mA drive at VCC = 3.0 V; higher ICC (up to 40 µA) | Acceptable for low-fanout or low-frequency buses; insufficient for driving long traces or heavy capacitive loads | Choose for legacy design continuity where reduced drive capability is acceptable and SOIC-20WB footprint is required. |
Compared with SN74LVC245APWR and 74LVX245M, the MC74LCX245DWR2 uniquely combines 5.5 V absolute maximum input rating, 24 mA drive across its entire 1.65–5.5 V range, and guaranteed IOFF behavior-making it the only option for robust, wide-supply, hot-swap-capable bus bridging in industrial and medical equipment.
Availability
MC74LCX245DWR2 is available at Aetrix Electronics and suitable for memory address driving, microcontroller bus expansion, industrial control backplanes, and legacy system interface adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74LCX245DWR2 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 MC74LCX245DWR2 belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-voltage system interconnects requiring 5 V tolerance, low static power, and robust hot-swap capability in space-constrained industrial and medical electronics.
FAQ
What is the maximum supply voltage for MC74LCX245DWR2?
The MC74LCX245DWR2 supports a DC supply voltage (VCC) from −0.5 V to +6.5 V, with recommended operation from 1.65 V to 5.5 V. Operation above 5.5 V is outside specification and may compromise reliability or cause damage. The 6.5 V absolute maximum rating applies only to transient conditions, not continuous operation.
Does MC74LCX245DWR2 support live insertion?
Yes, the MC74LCX245DWR2 supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance outputs when VCC = 0 V. This prevents back-driving of powered buses during hot-swap events, making it suitable for modular industrial controllers and field-replaceable units where cards are inserted or removed without system shutdown.
What is the function of the T/R and OE pins on MC74LCX245DWR2?
On the MC74LCX245DWR2, the T/R (Transmit/Receive) pin controls data direction: HIGH enables A→B flow, LOW enables B→A flow. The OE (Output Enable) pin controls 3-state operation: HIGH disables both A and B ports (high-Z), LOW enables transceiver functionality. Both pins are active-HIGH logic inputs referenced to VCC.
Can MC74LCX245DWR2 interface a 1.8 V microcontroller with a 5 V EEPROM?
Yes, the MC74LCX245DWR2 can safely interface a 1.8 V microcontroller with a 5 V EEPROM. Its 5 V-tolerant inputs accept VI up to 6.5 V, allowing the EEPROM's 5 V outputs to drive the A-side inputs directly. With VCC = 1.8 V, the B-side outputs swing to ~1.8 V, compatible with the microcontroller's input thresholds per LVTTL/LVCMOS specs.
Is MC74LCX245DWR2 pin-compatible with standard 74-series octal transceivers?
The MC74LCX245DWR2 uses the industry-standard SOIC-20WB pinout matching 74AC/74ACT/74LVC245 devices, including identical A0–A7, B0–B7, T/R, OE, VCC, and GND assignments. However, its 5 V tolerance, IOFF, and low ICC characteristics are not replicated in most legacy 74-series parts-verify timing and drive strength before substitution.
MC74LCX245DWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74LCX245DWR2 FAQ
1.How can I place an order for MC74LCX245DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX245DWR2 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 MC74LCX245DWR2 reliable?
The price and inventory of MC74LCX245DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX245DWR2 is usually 5 days.
3.What payment methods are accepted for MC74LCX245DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX245DWR2 transactions.
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4.How is shipping managed for MC74LCX245DWR2?
MC74LCX245DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX245DWR2 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 MC74LCX245DWR2?
For technical support, including MC74LCX245DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX245DWR2 requirements.
6.How does Aetrix verify that MC74LCX245DWR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX245DWR2 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 MC74LCX245DWR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX245DWR2?
All MC74LCX245DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX245DWR2, 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 MC74LCX245DWR2 part is unused and in its original packaging.
Return procedure for MC74LCX245DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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