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onsemi 74VCXH245MNR2G
- Part No.:
- 74VCXH245MNR2G
- Manufacturer:
- onsemi
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74VCXH245MNR2G.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,743
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Product details
Overview
74VCXH245MNR2G from onsemi is a low-voltage, non-inverting 8-bit transceiver with bushold inputs and 3-state outputs, designed for bidirectional data flow control between A and B buses in 1.65–3.6 V systems. It supports direction control via active-HIGH T/R and active-HIGH OE, delivers ±24 mA drive at 3.0 V, and achieves 3.5 ns max propagation delay at 3.3 V - enabling high-speed interconnect in portable and battery-powered logic interfaces.
For engineers reviewing the 74VCXH245MNR2G datasheet, pinout, applications, or equivalent options, key selection criteria include bushold-enabled floating-input robustness, QFN-20 package thermal performance, voltage-scalable timing (1.65–3.6 V), and static supply current under 20 µA in all logic states.
Technical Context
The 74VCXH245MNR2G implements a dual-bus transceiver architecture with independent OE and T/R control logic: OE HIGH disables both A and B ports into high-impedance, while T/R LOW enables B→A transfer and T/R HIGH enables A→B transfer. Its bushold circuitry actively maintains valid logic levels on unused A0–A7 and B0–B7 inputs without external pull-ups.
It operates across three voltage bands - 1.65–1.95 V (8.4 ns max tPLH), 2.3–2.7 V (4.2 ns), and 3.0–3.6 V (3.5 ns) - with corresponding output drive strengths of ±6 mA, ±18 mA, and ±24 mA. Absolute maximum VCC is +4.6 V, and latchup immunity exceeds ±200 mA at 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports single-supply operation across 1.8 V, 2.5 V, and 3.3 V logic domains |
| Propagation Delay (tPLH/tPHL) | 3.5 ns max at 3.0–3.6 V - enables >140 MHz data throughput in point-to-point bus applications |
| Output Drive Strength | ±24 mA at 3.0 V - drives heavy capacitive loads or multiple CMOS inputs without signal degradation |
| Bushold Input Current | ±75 µA at 3.0 V - actively holds floating A/B inputs at valid logic levels, eliminating external bias resistors |
| Quiescent Supply Current | 20 µA max - reduces standby power in always-on subsystems such as I/O expanders or level-shifting bridges |
| ESD Rating (HBM) | >2000 V - withstands handling and board-level ESD events without latchup or parametric shift |
| Package | 20-pin QFN (4.5 × 2.5 mm, 0.5 mm pitch, exposed thermal pad) - optimized for compact PCB layout and thermal dissipation |
Pinout & Package
74VCXH245MNR2G is housed in a 20-pad QFN package (Case 485AA), featuring an exposed thermal pad for enhanced heat dissipation and compact footprint (4.5 mm × 2.5 mm). Pin 10 is GND, pin 20 is VCC, and the device uses standard top-side marking with microdot orientation indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 19) | Output Enable Input | Active-HIGH global disable: places both A and B ports in high-impedance state when asserted |
| T/R (Pin 1) | Transmit/Receive Control | Active-HIGH = A→B data flow; Active-LOW = B→A data flow - enables bidirectional bus arbitration |
| A0–A7 (Pins 2–9) | Side A I/O Terminals | Bushold inputs / 3-state outputs - retain logic state when floating; driven by B side when T/R = LOW |
| B0–B7 (Pins 11–18) | Side B I/O Terminals | Bushold inputs / 3-state outputs - retain logic state when floating; driven by A side when T/R = HIGH |
| VCC (Pin 20) | Power Supply | Single 1.65–3.6 V supply - powers internal logic, bushold circuitry, and output drivers |
| GND (Pin 10) | Ground Reference | Common return path for all I/O and supply currents - must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Bushold input retention | Maintains valid logic state on unused A/B pins without external pull-up/down resistors - reduces BOM count and layout area |
| Voltage-scalable timing | Guaranteed 3.5 ns max propagation delay at 3.3 V and 8.4 ns at 1.8 V - ensures interoperability across mixed-voltage SoC interfaces |
| Ultra-low quiescent current | 20 µA max ICC in all three logic states (active/high-Z/standby) - extends battery life in portable I/O bridge applications |
| High-drive 3-state outputs | ±24 mA sink/source at 3.0 V - drives 15+ CMOS loads or 50 pF traces without signal integrity loss |
| Robust process reliability | Latchup immunity >±200 mA @ 85°C and HBM ESD >2000 V - meets industrial-grade stress requirements |
Applications
| Mobile Baseband Interface | Low-Power FPGA I/O Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between 1.8 V baseband processor and 3.3 V peripheral ICs (e.g., audio codec, PMIC). IC Role / Device Role / Timing Role: Voltage-level translating transceiver managing A/B bus direction under processor control via T/R and OE. Use Value: Bushold prevents floating inputs during sleep mode transitions; 3.5 ns delay ensures timing closure in 100+ MHz burst transfers. |
Use Scenario: Extending FPGA GPIO count to interface with legacy 2.5 V or 3.3 V sensors and displays in battery-powered edge nodes. IC Role / Device Role / Timing Role: Logic-level agnostic bus buffer providing programmable direction control and high-impedance isolation. Use Value: ±24 mA drive supports direct connection to LED segments or optocouplers; 20 µA ICC minimizes idle power draw. |
| USB-C Docking Station Hub | Industrial PLC I/O Module |
Use Scenario: Isolating and routing configuration signals (e.g., DP Alt Mode negotiation, USB PD policy engine commands) between 1.8 V controller and 3.3 V PHY. IC Role / Device Role / Timing Role: Low-latency, low-power signal translator with fail-safe bushold for hot-plug robustness. Use Value: 8.4 ns max delay at 1.8 V enables reliable handshaking under worst-case voltage corner; QFN thermal pad aids sustained operation. |
Use Scenario: Interfacing microcontroller GPIOs (1.8 V/2.5 V) to 24 V digital input modules requiring clean level-shifted enable/control lines. IC Role / Device Role / Timing Role: Isolated bus driver with high-impedance disable state preventing backfeed during module hot-swap. Use Value: ±200 mA latchup immunity protects against field-induced transients; exposed QFN pad improves long-term reliability in 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No bushold; requires external pull-ups on unused inputs; 1.65–3.6 V compatible; 3.9 ns max tPLH at 3.3 V | Suitable where board space allows discrete biasing and lower drive (±24 mA same) suffices | Select when bushold is unnecessary and cost sensitivity outweighs design simplification benefits |
| 74AVCH245BQX | Higher speed (2.2 ns max at 3.3 V); supports 1.2–3.6 V; no bushold; different pinout (TSSOP20 vs QFN20) | Better for ultra-high-speed FPGA-to-memory links but lacks floating-input protection | Choose only if timing margin is critical and input biasing strategy is already defined |
Compared with SN74LVC245APWR and 74AVCH245BQX, the 74VCXH245MNR2G uniquely combines bushold functionality, QFN thermal efficiency, and guaranteed sub-4 ns delay at 3.3 V - making it optimal for space-constrained, low-power, floating-input-prone designs where layout simplicity and reliability are prioritized over marginal speed gains.
Availability
74VCXH245MNR2G is available at Aetrix Electronics and suitable for mobile baseband interfaces, low-power FPGA I/O expansion, USB-C docking station hubs, and industrial PLC I/O modules requiring stable component supply, Pb-free compliance, and QFN packaging.
Supply support for 74VCXH245MNR2G 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 74VCXH245MNR2G belongs to the VCX logic family - engineered specifically for low-voltage, high-speed, low-power bidirectional bus interfacing in portable and mixed-voltage embedded systems.
FAQ
What voltage ranges does the 74VCXH245MNR2G support, and how does that affect its use in mixed-voltage systems?
The 74VCXH245MNR2G operates from 1.65 V to 3.6 V, covering 1.8 V, 2.5 V, and 3.3 V logic domains. This allows it to serve as a voltage-level translator between processors and peripherals operating at different supply rails - for example, connecting a 1.8 V FPGA core to a 3.3 V display interface. Its AC timing specs are guaranteed per voltage band, ensuring predictable performance without external level shifters.
Does the 74VCXH245MNR2G require external pull-up resistors on unused inputs?
No. The 74VCXH245MNR2G integrates active bushold circuitry on all A0–A7 and B0–B7 inputs, which maintains valid logic states on floating pins without external components. At 3.0 V, bushold provides ±75 µA holding current - sufficient to prevent metastability during power sequencing or hot-swap events in the 74VCXH245MNR2G.
What is the maximum propagation delay of the 74VCXH245MNR2G, and under what conditions is it specified?
The 74VCXH245MNR2G has a maximum propagation delay of 3.5 ns when VCC is 3.0–3.6 V, CL = 30 pF, and tR/tF = 2.0 ns. At lower voltages, delays increase to 4.2 ns (2.3–2.7 V) and 8.4 ns (1.65–1.95 V). These values are measured input-to-output (tPLH/tPHL) and guarantee timing margins for synchronous bus protocols using the 74VCXH245MNR2G.
How does the 74VCXH245MNR2G handle output enable and direction control?
The 74VCXH245MNR2G uses two independent controls: OE (pin 19) is active-HIGH and globally disables both A and B ports into high-impedance, while T/R (pin 1) determines direction - HIGH enables A→B transfer, LOW enables B→A. This dual-control scheme allows precise bus arbitration in shared-data-path architectures using the 74VCXH245MNR2G.
Is the 74VCXH245MNR2G RoHS-compliant and suitable for lead-free assembly?
Yes. The "G" suffix in 74VCXH245MNR2G denotes a Pb-free (RoHS-compliant) QFN package. It supports standard lead-free reflow profiles, including peak temperatures up to 260°C, and features an exposed thermal pad compatible with standard solder-paste stencil designs - fully qualified for high-reliability manufacturing of the 74VCXH245MNR2G.
74VCXH245MNR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VCXH
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (2.5x4.5)
74VCXH245MNR2G FAQ
1.How can I place an order for 74VCXH245MNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VCXH245MNR2G 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 74VCXH245MNR2G reliable?
The price and inventory of 74VCXH245MNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH245MNR2G is usually 5 days.
3.What payment methods are accepted for 74VCXH245MNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH245MNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VCXH245MNR2G?
74VCXH245MNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VCXH245MNR2G 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 74VCXH245MNR2G?
For technical support, including 74VCXH245MNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH245MNR2G requirements.
6.How does Aetrix verify that 74VCXH245MNR2G is sourced from the original manufacturer or authorized distributors?
All 74VCXH245MNR2G 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 74VCXH245MNR2G meets industry standards.
7.What is the process for return or replacement of 74VCXH245MNR2G?
All 74VCXH245MNR2G units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH245MNR2G, 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 74VCXH245MNR2G part is unused and in its original packaging.
Return procedure for 74VCXH245MNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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