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onsemi MC74LCX245DTR2
- Part No.:
- MC74LCX245DTR2
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74LCX245DTR2.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,343
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Product details
Overview
MC74LCX245DTR2 from onsemi is a low-voltage CMOS octal transceiver with 5 V-tolerant inputs/outputs, non-inverting bidirectional data flow, 3-state control, and operation from 1.65 V to 5.5 V. It delivers ±24 mA drive at VCC = 3.0 V, supports live insertion, and features IOFF protection for hot-swap applications in memory address buses and TTL-level bus systems.
For engineers reviewing the MC74LCX245DTR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance with sub-2 V supply compatibility, direction control via T/R input, output enable timing (tPZH/tPLZ ≤ 7.0 ns at 4.5–5.5 V), and AEC-Q100 qualification for automotive use.
Technical Context
The MC74LCX245DTR2 implements a dual-bus, non-inverting transceiver architecture with independent OE (active-HIGH disable) and T/R (active-HIGH transmit, active-LOW receive) controls. Its 5 V-tolerant I/O allows safe interfacing between 3.3 V logic and legacy 5 V systems without level shifters.
It features IOFF circuitry ensuring high-impedance outputs when VCC = 0 V, enabling live insertion in backplane or hot-swap modules. Propagation delay is 5.0 ns max (tPLH/tPHL) and output enable/disable times are 7.0 ns / 6.0 ns (tPZH/tPLZ) at 4.5–5.5 V, supporting high-speed bus arbitration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - enables single-supply operation across LVTTL, LVCMOS, and mixed-voltage system interfaces |
| IO Drive | ±24 mA at VCC = 3.0 V - sufficient to drive multiple TTL loads or terminated transmission lines without external buffers |
| tPLH/tPHL | 5.0 ns max at 4.5–5.5 V - supports >100 MHz bus clocking with tight timing margins |
| tPZH/tPLZ | 7.0 ns / 6.0 ns max at 4.5–5.5 V - ensures fast bus turnaround for half-duplex protocols |
| VI Absolute Max | −0.5 V to +6.5 V - guarantees robustness against transient overvoltage and 5 V signal injection during power sequencing |
| IOFF Leakage | ≤10 µA at VI = 5.5 V - prevents back-powering of powered-down domains in modular systems |
| ESD HBM | >2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
TSSOP-20 package (Case 948E), 0.65 mm pitch, 6.5 mm × 4.4 mm footprint, lead-free (G suffix), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | T/R | Direction control: HIGH = A→B, LOW = B→A - enables bidirectional data routing without external logic |
| 12, 20 | OE | Output enable: HIGH = high-impedance state on both A and B ports - provides bus isolation during arbitration or standby |
| 2–9 | A0–A7 | Side A I/O terminals - connect to local processor or controller bus; 5 V tolerant even at 1.65 V VCC |
| 11–18 | B0–B7 | Side B I/O terminals - interface to peripheral or memory bus; identical electrical specs to A-side |
| 10 | GND | Ground reference - must be low-inductance connection to minimize switching noise coupling |
| 20 | VCC | Power supply - decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant I/O | Enables direct connection to 5 V TTL devices while operating from 1.65–3.3 V supplies - eliminates level translators in mixed-voltage designs |
| IOFF protection | Guarantees high-impedance outputs when VCC = 0 V - essential for hot-plug capability in modular backplanes and docking stations |
| Low static ICC | ≤10 µA in all three states - reduces quiescent power in battery-backed or always-on subsystems |
| Latchup immunity | >100 mA - exceeds JEDEC JESD78 requirements, ensuring reliability under transient fault conditions |
| AEC-Q100 qualified | Qualified per Grade 1 (−40°C to +125°C) with PPAP support - suitable for automotive body control and infotainment modules |
Applications
| Memory Address Bus Driver | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Driving 8-bit address lines from a 3.3 V microcontroller to legacy 5 V SRAM or EPROM chips. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver providing level translation and bus isolation. Use Value: Eliminates discrete level shifters; 5 V tolerance ensures safe operation during power-up sequencing where 5 V rails stabilize before 3.3 V. | Use Scenario: Interfacing modular I/O cards with a central 3.3 V controller in an industrial PLC rack. IC Role / Device Role / Timing Role: Hot-swap-capable bus transceiver enabling live card insertion/removal without system reset. Use Value: IOFF protection prevents back-driving of powered-down slots; tPZH ≤ 7.0 ns ensures fast bus reacquisition after card insertion. |
| Automotive Body Control Module | Test Equipment Digital I/O Adapter |
Use Scenario: Isolating CAN controller GPIO from 5 V sensor interface circuits in a vehicle door module. IC Role / Device Role / Timing Role: AEC-Q100-qualified transceiver managing bidirectional diagnostic and configuration signals. Use Value: −40°C to +125°C operation and PPAP documentation support full automotive qualification; 24 mA drive handles capacitive sensor loads. | Use Scenario: Adapting FPGA-based test pattern generators to legacy 5 V DUTs in automated test equipment. IC Role / Device Role / Timing Role: Reconfigurable bus interface with programmable direction and enable control. Use Value: OE and T/R pins allow software-controlled bus directionality; 5 V tolerance avoids damage from DUT signal overshoot during test transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Same 1.65–3.6 V VCC range; 5 V-tolerant I/O; slightly higher tPLH (6.7 ns max); no IOFF spec | Not AEC-Q100 qualified; rated only to +85°C ambient | Preferred for cost-sensitive commercial systems where automotive qualification is unnecessary |
| 74ALVC245PW | Wider VCC range (1.65–3.6 V); same 5 V tolerance; lower drive (±24 mA at VCC = 3.3 V); no AEC-Q100 cert | Higher propagation delay (7.5 ns max); not specified for hot-swap | Suitable for general-purpose 3.3 V bus extension where IOFF and extended temperature are not required |
Compared with MC74LCX245DTR2, SN74LVC245APWR lacks IOFF and automotive qualification but offers tighter parametric consistency in commercial environments, while 74ALVC245PW trades off hot-swap robustness and temperature range for broader vendor availability and lower unit cost.
Availability
MC74LCX245DTR2 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC backplanes, memory address bus drivers, and test equipment digital I/O adapters requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MC74LCX245DTR2 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MC74LCX245DTR2 belongs to the LCX family of low-voltage CMOS transceivers designed for mixed-voltage system interfacing, emphasizing 5 V tolerance, hot-swap safety, and AEC-Q100 compliance for automotive and rugged industrial use.
FAQ
What is the maximum supply voltage rating for MC74LCX245DTR2?
The MC74LCX245DTR2 has a maximum DC supply voltage (VCC) rating of +6.5 V, with recommended operation up to 5.5 V. This margin allows safe handling of transient overvoltage events and ensures robustness during power-rail sequencing in mixed-voltage systems. The device remains functional and undamaged within this absolute maximum limit, though sustained operation above 5.5 V is not recommended per datasheet guidelines.
Does MC74LCX245DTR2 support hot-swap functionality?
Yes, MC74LCX245DTR2 supports live insertion and withdrawal via its IOFF specification, which guarantees high-impedance outputs when VCC = 0 V. This prevents current backflow into unpowered circuit sections during hot-plug events. The feature is explicitly validated in the datasheet and makes MC74LCX245DTR2 suitable for modular backplanes, docking stations, and field-replaceable units requiring zero-downtime maintenance.
What is the meaning of the "−Q" suffix in MC74LCX245DTR2G−Q*?
The "−Q" suffix in MC74LCX245DTR2G−Q* denotes an automotive-grade variant meeting AEC-Q100 qualification standards and supporting PPAP documentation. It indicates unique site and process control requirements, including enhanced traceability, extended temperature validation (−40°C to +125°C), and stricter lot acceptance testing - all critical for automotive body control, infotainment, and ADAS applications where reliability is mandated.
Can MC74LCX245DTR2 interface directly between 1.8 V and 5 V logic domains?
Yes, MC74LCX245DTR2 can interface directly between 1.8 V and 5 V logic domains. Its 5 V-tolerant inputs accept VI up to 5.5 V regardless of VCC (as low as 1.65 V), and its outputs swing rail-to-rail (0 V to VCC). When VCC = 1.8 V, the device safely receives 5 V signals and drives 1.8 V-compatible loads - eliminating external level shifters in mixed-voltage systems such as IoT edge nodes with legacy peripherals.
What package type does MC74LCX245DTR2 use, and what are its key mechanical features?
MC74LCX245DTR2 uses the TSSOP-20 package (Case 948E), measuring 6.5 mm × 4.4 mm with 0.65 mm lead pitch. It is Pb-free (G suffix), RoHS compliant, and rated MSL Level 1 (unlimited floor life). Key features include gull-wing leads for reliable solder joint formation, exposed pad not present, and compatibility with standard SMT reflow profiles - making it suitable for high-density PCB layouts in space-constrained automotive and industrial modules.
MC74LCX245DTR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
MC74LCX245DTR2 FAQ
1.How can I place an order for MC74LCX245DTR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX245DTR2 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 MC74LCX245DTR2 reliable?
The price and inventory of MC74LCX245DTR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX245DTR2 is usually 5 days.
3.What payment methods are accepted for MC74LCX245DTR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX245DTR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX245DTR2?
MC74LCX245DTR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX245DTR2 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 MC74LCX245DTR2?
For technical support, including MC74LCX245DTR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX245DTR2 requirements.
6.How does Aetrix verify that MC74LCX245DTR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX245DTR2 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 MC74LCX245DTR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX245DTR2?
All MC74LCX245DTR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX245DTR2, 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 MC74LCX245DTR2 part is unused and in its original packaging.
Return procedure for MC74LCX245DTR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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