My Inquiry
My Account
STMicroelectronics 74LVXC4245MTR
- Part No.:
- 74LVXC4245MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74LVXC4245MTR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74LVXC4245MTR from STMicroelectronics is an octal dual-supply bus transceiver enabling bidirectional level translation between 5V and 3.3V–5V buses. It features 8-bit A/B data ports, DIR-controlled directionality, G-enabled tri-state isolation, symmetrical 24mA drive strength, and 6.5ns max propagation delay at 5.0V/5.0V - deployed in mixed-voltage motherboard interconnects and legacy-to-modern interface bridging.
For engineers reviewing the 74LVXC4245MTR datasheet, 74LVXC4245MTR pinout, 74LVXC4245MTR application, or 74LVXC4245MTR equivalent, key selection criteria include dual-rail voltage tolerance (VCCA = 4.5–5.5V, VCCB = 2.7–5.5V), guaranteed 24mA output drive, low 5µA quiescent current, balanced tPLH/tPHL timing, and SOP-24 package compatibility with legacy 74-series C4245 footprints.
Technical Context
This IC implements asynchronous bidirectional data flow using a single DIR input to select transmission direction (A→B or B→A) and an active-low G input to place both ports in high-impedance state. Its dual-supply architecture isolates VCCA (5V domain) and VCCB (3.3V–5V domain), allowing independent rail operation without level-shifting resistors or external translators.
Input thresholds are rail-relative: VIHA/VILA referenced to VCCA, VIHB/VILB to VCCB; output VOHA/VOLB swing fully to respective supply rails under load. ESD protection (2kV HBM) and latch-up immunity are built-in, supporting robust operation in industrial backplane environments with mixed-voltage signal routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 6.5ns max (tPD) at VCCA=5.0V, VCCB=5.0V - enables ≤150MHz bus handshaking in synchronous systems |
| Output Drive Strength | ±24mA min (|IOH| = IOL) - supports direct driving of 50Ω terminated lines or multiple CMOS loads |
| Voltage Ranges | VCCA = 4.5–5.5V; VCCB = 2.7–5.5V - allows interoperability between 5V TTL, 3.3V LVTTL, and mixed 3.3/5V backplanes |
| Quiescent Current | 5µA max per supply (ICCA/ICCB) at TA=25°C - minimizes standby power in always-on interface bridges |
| ESD Immunity | 2kV HBM on all pins - eliminates need for external TVS diodes in board-level ESD protection schemes |
| Dynamic Noise | VOLP = 0.3V typ at VCCA=5.0V/VCCB=3.3V - reduces ground bounce and crosstalk in dense PCB layouts |
| Skew Tolerance | tOSLH/tOSHL ≤ 1.5ns - ensures deterministic timing alignment across all 8 data bits during burst transfers |
Pinout & Package
SOP-24 package (SO-24, 15.2–15.6mm body width, 1.27mm pitch), lead-free and RoHS-compliant per STMicroelectronics specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCCA | 5V-domain supply rail - powers A-port I/O cells and internal logic; must be decoupled locally |
| 2 | DIR | Direction control input - HIGH enables B→A transfer; LOW enables A→B transfer; no pull-up required |
| 3–10 | A1–A8 | 5V-bus data I/O - bidirectional port tied to 5V system; tolerates 0–VCCA input range |
| 11–13 | GND | Dual ground reference - common return for both supplies; requires low-inductance PCB connection |
| 14–21 | B1–B8 | 3.3V–5V-bus data I/O - bidirectional port compatible with LVTTL, TTL, and 5V CMOS |
| 22 | G | Output enable - active LOW; asserts high-impedance on both A and B ports when HIGH |
| 23 | NC | No connect - internally unconnected; must remain floating or grounded per layout best practice |
| 24 | VCCB | 3.3V–5V domain supply - powers B-port I/O; independent regulation prevents supply coupling |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-supply interface | Independent VCCA (4.5–5.5V) and VCCB (2.7–5.5V) allow seamless integration between legacy 5V and modern 3.3V subsystems |
| Direction-controlled bidirectional data flow | Single DIR pin selects real-time A↔B path without clock or protocol overhead - ideal for simple parallel bus bridging |
| Tri-state isolation via G input | Active-low G disables both ports simultaneously, eliminating bus contention during hot-swap or power sequencing |
| Low-noise output design | VOLP = 0.3V typical suppresses simultaneous switching noise (SSN), critical for signal integrity in high-density interconnects |
| Rail-to-rail output swing | VOHA ≥ 3.86V @ 24mA (VCCA=5V), VOHB ≥ 2.56V @ 12mA (VCCB=3V) - ensures full logic margin across voltage domains |
Applications
| Industrial PLC Backplane Interface | Embedded CPU-to-Peripheral Bridge |
|---|---|
|
Use Scenario: Connecting a 5V microcontroller bus to 3.3V sensors and actuators in programmable logic controller racks. IC Role / Device Role / Timing Role: Level-translating octal transceiver providing direction-controlled, isolated data path between mismatched voltage domains. Use Value: Eliminates discrete resistor-based level shifters while maintaining <6.5ns timing consistency across all 8 data lines for deterministic I/O scanning. |
Use Scenario: Interfacing a 5V FPGA configuration bus to 3.3V DDR memory controllers in edge computing modules. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling boot-time configuration data exchange and runtime status reporting. Use Value: Guarantees 24mA drive into 50Ω traces and 1.5ns max skew - preserving setup/hold margins for 100MHz+ parallel memory access. |
| Legacy ISA-to-PCIe Adapter Logic | Automotive Body Control Module |
|
Use Scenario: Translating control signals from a 5V ISA bus to a 3.3V PCIe bridge ASIC in industrial retrofit adapters. IC Role / Device Role / Timing Role: Voltage-domain translator with DIR/G control enabling software-configurable data direction and hot-plug isolation. Use Value: Supports 5V-tolerant inputs and rail-swing outputs - avoids level-shifter cascades and reduces BOM count by 3+ components per channel. |
Use Scenario: Isolating 5V CAN transceiver control lines from 3.3V microcontroller GPIO in automotive body electronics. IC Role / Device Role / Timing Role: Low-power, ESD-hardened bus interface managing diagnostic command/response traffic between domains. Use Value: 5µA quiescent current extends battery life in always-on modules; 2kV HBM withstands vehicle-level ESD events without external protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal dual-supply bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4245APWR | VCCB range limited to 3.0–3.6V; no 5.5V tolerance; lower VOLB (0.36V max @24mA) | Restricted to strict 3.3V B-side use; unsuitable for 5V-tolerant B-port designs | Select when B-port operates exclusively at 3.3V and tighter VOLB is required |
| 74ALVC164245DGGR | 16-bit version in TSSOP-48; higher ICC (20µA typ); supports VCCB down to 1.65V | Designed for wider voltage scaling (1.65–3.6V B-side); not pin-compatible with SOP-24 | Choose for future-proofing with ultra-low-voltage peripherals or higher channel density needs |
Compared with SN74LVC4245APWR and 74ALVC164245DGGR, the 74LVXC4245MTR uniquely supports full 2.7–5.5V VCCB operation in a legacy-compatible SOP-24 footprint - making it the only option for designs requiring 5V-tolerant B-side interfacing without board redesign.
Availability
74LVXC4245MTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded CPU-peripheral bridges, legacy-to-modern adapter cards, and automotive body control modules requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for 74LVXC4245MTR 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 specializing in automotive, industrial, and power management ICs, with over 40 years of analog and mixed-signal design heritage.
The 74LVXC4245 belongs to ST's LVX low-voltage translation logic family, engineered specifically for reliable, low-noise voltage-domain bridging in mixed-supply industrial and telecom infrastructure equipment.
FAQ
Can 74LVXC4245MTR operate with VCCB = 5.0V while VCCA = 4.5V?
Yes. The device supports independent supply operation: VCCA may range from 4.5V to 5.5V and VCCB from 2.7V to 5.5V. At VCCA = 4.5V and VCCB = 5.0V, DC specifications guarantee VIHB ≥ 3.85V, VOHB ≥ 3.86V @24mA, and VOLB ≤ 0.44V - ensuring full logic compatibility and drive capability on both sides.
What is the maximum capacitive load this transceiver can drive reliably?
The datasheet specifies dynamic performance up to CL = 50pF (Table 9). With 24mA drive strength and 6.5ns max tPD, it reliably drives standard 50Ω PCB traces (≈3–5pF/inch) and up to three 10pF CMOS inputs per line. For >50pF loads, propagation delay increases linearly; derating curves in Figure 4 confirm stable operation up to 100pF with <10% timing degradation.
Is the NC pin (pin 23) required to be grounded or left floating?
Pin 23 is a true no-connect terminal with no internal bond wire or circuit connection. STMicroelectronics' mechanical drawing and absolute maximum ratings confirm it must remain unconnected - neither grounded nor tied to any supply. PCB layout should omit solder mask opening and avoid routing near this pad to prevent accidental shorts.
Does DIR input require external pull-up or pull-down resistors?
No. The DIR input has rail-referenced CMOS thresholds (VIHA = 2.0V min, VILA = 0.8V max at VCCA = 4.5–5.5V) and exhibits <1µA leakage. It accepts clean logic-level signals directly from MCU GPIO or FPGA outputs without external biasing - verified across −40°C to +85°C operating range per Table 6 DC specs.
74LVXC4245MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVXC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- 3-State
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC (0.295", 7.50mm Width)
74LVXC4245MTR FAQ
1.How can I place an order for 74LVXC4245MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVXC4245MTR 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 74LVXC4245MTR reliable?
The price and inventory of 74LVXC4245MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVXC4245MTR is usually 5 days.
3.What payment methods are accepted for 74LVXC4245MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVXC4245MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVXC4245MTR?
74LVXC4245MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVXC4245MTR 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 74LVXC4245MTR?
For technical support, including 74LVXC4245MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVXC4245MTR requirements.
6.How does Aetrix verify that 74LVXC4245MTR is sourced from the original manufacturer or authorized distributors?
All 74LVXC4245MTR 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 74LVXC4245MTR meets industry standards.
7.What is the process for return or replacement of 74LVXC4245MTR?
All 74LVXC4245MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVXC4245MTR, 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 74LVXC4245MTR part is unused and in its original packaging.
Return procedure for 74LVXC4245MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LVXC4245MTR Tags
-
74LVC1T45GW,125
Nexperia USA Inc.
-
74LVCH2T45DC,125
Nexperia USA Inc.
-
SN74LVC1T45DBVR
Texas Instruments
-
SN74LVC1T45DRLR
Texas Instruments
-
SN74LVC1T45DPKR
Texas Instruments
-
SN74LVC2T45DCTR
Texas Instruments
-
74LVC2T45GT,115
Nexperia USA Inc.
-
SN74LVC1T45YZPR
Texas Instruments
-
LSF0102DCUR
Texas Instruments
-
SN74LVC1T45DCKR
Texas Instruments
-
TXS0102DCTR
Texas Instruments
-
FXLP34P5X
onsemi
Tech Hub
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…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
