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onsemi 74VCXH245MNR2
- Part No.:
- 74VCXH245MNR2
- Manufacturer:
- onsemi
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74VCXH245MNR2.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
74VCXH245MNR2 from ON Semiconductor 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 3.5 ns propagation delay at 3.0–3.6 V, ±24 mA drive strength at 3.0 V, and operates across −40°C to +85°C for embedded interface buffering.
For engineers reviewing the 74VCXH245MNR2 datasheet, pinout, applications, or equivalent options, key selection criteria include voltage scalability (1.65–3.6 V), bushold-enabled floating-input immunity, QFN-20 package footprint, and direction-controlled bus isolation in mixed-voltage SoC interconnects.
Technical Context
The 74VCXH245MNR2 implements dual-bus bidirectional data transfer via independent T/R (active-low receive) and OE (active-high output disable) controls. Its bushold circuitry actively maintains logic state on unused A0–A7 and B0–B7 inputs without external pull resistors, reducing BOM count and layout complexity.
It features rail-to-rail input thresholds (VIH/VIL scaling with VCC), guaranteed AC timing across three voltage bands (1.65–1.95 V, 2.3–2.7 V, 3.0–3.6 V), and near-zero quiescent ICC (20 µA) in all logic states - enabling low-power retention modes in portable and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Propagation Delay (tPLH/tPHL) | 3.5 ns max at 3.0–3.6 V - enables >200 MHz bus operation in high-speed digital interfaces. |
| Output Drive Strength | ±24 mA at 3.0 V - sufficient to drive 50 Ω transmission lines or multiple CMOS loads without signal degradation. |
| Bushold Input Current | ±75 µA at 3.0 V - ensures stable logic retention on floating inputs, eliminating need for external biasing. |
| Quiescent Supply Current | 20 µA - reduces standby power in always-on subsystems such as wake-on-LAN or real-time monitoring circuits. |
| ESD Rating (HBM) | >2000 V - meets industrial IEC 61000-4-2 system-level robustness requirements without added protection. |
| Operating Temperature | −40°C to +85°C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
74VCXH245MNR2 uses a 20-pin QFN package (Case 485AA), 4.5 mm × 2.5 mm body, 0.5 mm pitch, exposed thermal pad, and RoHS-compliant Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | T/R | Active-low Transmit/Receive control: LOW enables B→A data flow; HIGH enables A→B. |
| 2–9, 11–18 | A0–A7, B0–B7 | Bidirectional I/O with bushold: function as inputs or 3-state outputs depending on T/R and OE state. |
| 10 | GND | Ground reference for all internal logic and I/O stages; must be low-impedance connection to PCB ground plane. |
| 19 | OE | Active-high Output Enable: HIGH disables both A and B ports into high-impedance (Z) state. |
| 20 | VCC | Single supply rail (1.65–3.6 V) powering all logic, bushold, and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Actively holds A0–A7 and B0–B7 at valid logic levels when floating - eliminates external pull-up/down resistors and associated board space. |
| Multi-Voltage Compatibility | Operates across 1.65–3.6 V without configuration - simplifies integration in heterogeneous voltage domain systems (e.g., FPGA I/O banks interfacing with microcontrollers). |
| Low-Power 3-State Control | OE-driven high-Z mode draws only 20 µA total supply current - ideal for dynamic bus arbitration and power-gated subsystems. |
| High-Speed Timing Guarantees | AC parameters fully specified across three VCC bands - enables deterministic timing closure in mixed-supply designs without derating. |
| Robust ESD Protection | Human Body Model >2000 V - reduces risk of field failure during handling and system integration without supplemental TVS devices. |
Applications
| Mobile Baseband Interface | 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) in smartphone platforms. IC Role / Device Role / Timing Role: Voltage-scalable bus transceiver providing direction-controlled, bushold-protected signal bridging between mismatched voltage domains. Use Value: Eliminates discrete level shifters while maintaining sub-4 ns timing integrity and zero external bias components. |
Use Scenario: Extending FPGA GPIO count to drive off-board sensors, displays, or legacy peripherals operating at different logic voltages. IC Role / Device Role / Timing Role: Configurable 8-bit bidirectional buffer enabling synchronous read/write handshaking with precise OE/T/R timing control. Use Value: Reduces FPGA pin utilization and simplifies PCB routing by consolidating voltage translation and bus isolation into one QFN-20 device. |
| Industrial PLC Backplane | Automotive Infotainment Gateway |
|
Use Scenario: Isolating and buffering control signals between 2.5 V MCU modules and 3.3 V I/O expansion cards in modular PLC racks. IC Role / Device Role / Timing Role: Fault-tolerant bus transceiver with latchup immunity (>±200 mA) and extended temperature support (−40°C to +85°C). Use Value: Ensures reliable hot-swap and noise-immune communication in electrically noisy factory environments without additional protection circuitry. |
Use Scenario: Interfacing 1.8 V ADAS sensor fusion processor with 3.3 V CAN/LIN transceivers and display controllers in head-unit designs. IC Role / Device Role / Timing Role: Low-power, bushold-equipped transceiver enabling glitch-free bus arbitration during sleep/wake transitions. Use Value: Maintains signal integrity during voltage-domain switching events and reduces static current draw in always-on vehicle networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Wider VCC range (1.65–5.5 V); no bushold; higher drive (±24 mA at 3.3 V); same QFN-20 footprint. | Lacks bushold - requires external pull resistors on unused pins; suitable where board space allows discrete biasing. | Select when interfacing with 5 V peripherals or when bushold is unnecessary and cost optimization is prioritized. |
| 74ALVC245MTCX | Lower VCC min (1.65 V), identical bushold and timing specs; uses TSSOP-20 package (6.5 mm × 4.4 mm) instead of QFN-20. | Requires larger PCB area and lacks thermal pad - less suitable for high-density or thermally constrained layouts. | Select when QFN assembly capability is unavailable or when manual rework accessibility is required. |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74VCXH245MNR2 uniquely combines bushold functionality, QFN-20 thermal efficiency, and guaranteed sub-4 ns timing at 3.3 V - making it optimal for space-constrained, low-power, mixed-voltage embedded interfaces where floating-input reliability is critical.
Availability
74VCXH245MNR2 is available at Aetrix Electronics and suitable for mobile baseband interfaces, FPGA I/O expansion, industrial PLC backplanes, and automotive infotainment gateways requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 74VCXH245MNR2 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 74VCXH245MNR2 belongs to the VCX family of ultra-low-voltage logic devices engineered for high-speed, low-power bidirectional bus interfacing in mixed-voltage embedded systems.
FAQ
What voltage ranges does the 74VCXH245MNR2 support?
The 74VCXH245MNR2 supports a single-supply VCC range of 1.65 V to 3.6 V, with guaranteed AC and DC performance across three defined bands: 1.65–1.95 V, 2.3–2.7 V, and 3.0–3.6 V. This allows direct use in 1.8 V, 2.5 V, and 3.3 V systems without external level-shifting circuitry. The 74VCXH245MNR2's VIH and VIL thresholds scale proportionally with VCC, ensuring robust noise margins across all supported voltages.
Does the 74VCXH245MNR2 require external pull-up resistors on unused inputs?
No - the 74VCXH245MNR2 integrates active bushold circuitry on all A0–A7 and B0–B7 inputs, which automatically maintains a valid logic state on floating or unused pins. This eliminates the need for external pull-up or pull-down resistors, reducing BOM count, PCB area, and potential signal integrity issues caused by resistor parasitics. The 74VCXH245MNR2's bushold current is specified at ±75 µA at 3.0 V, ensuring reliable state retention even under marginal noise conditions.
What is the maximum propagation delay of the 74VCXH245MNR2 at 3.3 V?
At VCC = 3.0 V to 3.6 V, the 74VCXH245MNR2 guarantees a maximum propagation delay (tPLH/tPHL) of 3.5 ns under standard test conditions (CL = 30 pF, RL = 500 Ω, tR/tF = 2.0 ns). This specification applies to all A↔B data paths and enables reliable operation in high-speed digital interfaces up to approximately 200 MHz. The 74VCXH245MNR2 maintains this timing performance across its full operating temperature range (−40°C to +85°C).
Is the 74VCXH245MNR2 pin-compatible with other 20-pin transceivers like the 74LVC245?
No - although the 74VCXH245MNR2 shares the same 20-pin QFN footprint (Case 485AA) with some LVC-family devices, its pinout differs: T/R is on Pin 1 (not Pin 19), OE is on Pin 19 (not Pin 1), and GND is on Pin 10 (not Pin 10 in all variants but requires verification per datasheet). Direct substitution without layout review risks functional failure. The 74VCXH245MNR2 must be used with its documented pin mapping - especially critical for T/R polarity and OE activation level.
What thermal and mechanical specifications apply to the 74VCXH245MNR2 package?
The 74VCXH245MNR2 uses a 20-pin QFN package (Case 485AA) measuring 4.5 mm × 2.5 mm with 0.5 mm pitch and an exposed thermal pad. Its maximum package height is 0.80 mm, coplanarity is ≤0.10 mm, and recommended solder profile follows J-STD-020 for moisture sensitivity level (MSL) 3. The exposed pad must be soldered to a thermal land for optimal junction-to-board thermal resistance - critical for sustained 24 mA output drive without exceeding TJ(max) = +125°C. The 74VCXH245MNR2's thermal performance is validated per JEDEC standards for industrial ambient conditions.
74VCXH245MNR2 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)
74VCXH245MNR2 FAQ
1.How can I place an order for 74VCXH245MNR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VCXH245MNR2 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 74VCXH245MNR2 reliable?
The price and inventory of 74VCXH245MNR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH245MNR2 is usually 5 days.
3.What payment methods are accepted for 74VCXH245MNR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH245MNR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VCXH245MNR2?
74VCXH245MNR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VCXH245MNR2 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 74VCXH245MNR2?
For technical support, including 74VCXH245MNR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH245MNR2 requirements.
6.How does Aetrix verify that 74VCXH245MNR2 is sourced from the original manufacturer or authorized distributors?
All 74VCXH245MNR2 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 74VCXH245MNR2 meets industry standards.
7.What is the process for return or replacement of 74VCXH245MNR2?
All 74VCXH245MNR2 units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH245MNR2, 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 74VCXH245MNR2 part is unused and in its original packaging.
Return procedure for 74VCXH245MNR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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