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Texas Instruments SN74LVCH245APWRE4
- Part No.:
- SN74LVCH245APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCH245APWRE4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,065
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Product details
Overview
SN74LVCH245APWRE4 from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for bidirectional data flow between 1.65-V to 3.6-V buses while accepting 5.5-V-tolerant inputs. It features direction control (DIR), active-low output enable (OE), bus-hold on all data inputs, Ioff for live insertion, and delivers 6.3 ns max propagation delay at 3.3 V - enabling use as a level translator in mixed-voltage server and networking backplanes.
For engineers reviewing the SN74LVCH245APWRE4 datasheet, SN74LVCH245APWRE4 pinout, SN74LVCH245APWRE4 application, or SN74LVCH245APWRE4 equivalent, key selection criteria include its 5.5-V input tolerance, Ioff partial-power-down support, bus-hold elimination of external resistors, 20-pin TSSOP package, and compatibility with 3.3-V/5-V interface bridging in industrial and telecom infrastructure designs.
Technical Context
This device implements asynchronous bidirectional data transfer using a single DIR signal to select A→B or B→A directionality, with OE independently gating all outputs into high-impedance state. Its CMOS input structure supports 5.5-V tolerant operation regardless of VCC, enabling robust interfacing between legacy 5-V logic and modern low-voltage domains.
The integrated bus-hold circuit maintains valid logic states on floating A/B port inputs without external biasing, and the Ioff feature actively disables outputs during power-down to prevent back-drive current - both critical for hot-swap-capable systems like modular switches and blade servers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into 1.8-V, 2.5-V, and 3.3-V supply domains without level-shifting circuitry |
| Input Voltage Tolerance | Up to 5.5 V - allows safe connection to 5-V microcontrollers, FPGAs, or legacy peripherals without external clamping |
| Max Propagation Delay | 6.3 ns at 3.3 V - supports >80 MHz data throughput in point-to-point bus applications |
| Ioff Leakage | ±10 µA at 0 V VCC - ensures no back-current flow during partial power-down, protecting powered subsystems |
| Bus-Hold Current | ±75 µA at 3 V - actively sustains logic state on un-driven A/B pins, eliminating need for pull-up/down resistors |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without additional board-level protection |
| Output Drive | ±24 mA at 3 V - drives standard 50-pF loads with fast edge rates while maintaining signal integrity |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, moisture-sensitive level 1 (MSL-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A - determines real-time bus direction without reset or configuration |
| 19 (OE) | Active-low output enable | Low = outputs enabled; High = all A/B ports enter high-Z - provides software-controllable bus isolation |
| 2–9 (A1–A8) | Bidirectional data port A | Connects to local processor or controller bus; bus-hold maintains state when un-driven |
| 11–18 (B1–B8) | Bidirectional data port B | Interfaces to peripheral or memory bus; 5.5-V tolerant inputs accept 5-V signals at any VCC |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection |
| 20 (VCC) | Positive supply | Single supply powers all logic and I/O; decoupling capacitor required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Operates at 1.65–3.6 V VCC while reliably accepting 0–5.5 V inputs - eliminates discrete level shifters in 3.3/5-V interconnects |
| Live-insertion support | Ioff circuitry disables outputs during power-off - prevents damage when hot-plugging modules in telecom or server chassis |
| Bus-hold inputs | Internal latches hold A/B port states without external resistors - reduces BOM count and PCB area in space-constrained designs |
| Output ground bounce control | Typical VOLP < 0.8 V at 3.3 V - minimizes noise coupling into shared ground planes during high-speed switching |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against transient overcurrent events in noisy industrial environments |
Applications
| Server Backplane Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Bidirectional data exchange between 3.3-V CPU module and 5-V legacy I/O cards in a rack-mounted server. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing A→B and B→A transfers under DIR control, with OE enabling dynamic bus partitioning. Use Value: Eliminates need for dual-supply translators or discrete MOSFET-based solutions, reducing layout complexity and component count by 3+ parts per interface. | Use Scenario: Isolating field-side 24-V digital inputs from 3.3-V microcontroller in programmable logic controller base unit. IC Role / Device Role / Timing Role: Signal conditioning interface providing 5.5-V tolerant input capture and controlled output drive to optocoupler drivers. Use Value: Bus-hold prevents floating inputs during sensor disconnect; Ioff protects MCU during field wiring hot-swap - improving system uptime and serviceability. |
| Network Switch ASIC Interface | Medical Imaging Data Link |
Use Scenario: Interfacing 3.3-V packet processor ASIC to 5-V PHY management bus in enterprise Ethernet switch line card. IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing register reads/writes across voltage domains with sub-7-ns timing margin. Use Value: 6.3 ns tpd at 3.3 V ensures setup/hold compliance for 100-MHz control bus timing; 2000-V HBM withstands ESD events in lab and field environments. | Use Scenario: Transmitting real-time ADC sample streams from 5-V analog front-end to 1.8-V FPGA in portable ultrasound equipment. IC Role / Device Role / Timing Role: High-fidelity data conduit supporting burst-mode transfers with deterministic latency and minimal skew (tsk(o) ≤ 1 ns). Use Value: Low output skew and tight propagation delay matching preserve timing alignment across 8-channel parallel data paths - critical for coherent image reconstruction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | No bus-hold; 1.65–3.6 V VCC; 5.5-V tolerant inputs; 6.7 ns tpd at 3.3 V | Lacks bus-hold - requires external pull-up/down resistors on unused lines | Choose when cost sensitivity outweighs board space constraints and floating-input risk is mitigated by system design |
| 74AVC8T245 | 1.2–3.6 V VCC; 3.6-V tolerant inputs; no Ioff; 4.2 ns tpd at 1.8 V | Lower VCC minimum enables 1.2-V core logic integration but lacks Ioff for hot-swap safety | Prefer for ultra-low-voltage portable systems where partial power-down is not required |
Compared with SN74LVC245A and 74AVC8T245, SN74LVCH245APWRE4 uniquely combines bus-hold, Ioff, and 5.5-V input tolerance in a single 20-pin TSSOP - making it the only option among the three qualified for hot-pluggable, resistor-free, mixed-voltage backplane interfaces in industrial and telecom equipment.
Availability
SN74LVCH245APWRE4 is available at Aetrix Electronics and suitable for server backplanes, industrial PLCs, network switch ASIC interfaces, and medical imaging data links requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCH245APWRE4 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
SN74LVCH245APWRE4 belongs to TI's LVCH logic family, engineered specifically for robust voltage translation and bus isolation in mixed-supply systems - targeting applications where reliability, hot-swap capability, and reduced external component count are critical.
FAQ
What is the maximum input voltage rating for SN74LVCH245APWRE4?
SN74LVCH245APWRE4 accepts input voltages up to 5.5 V on all A and B port pins, independent of VCC level - enabling direct interfacing with 5-V logic families while operating from as low as 1.65 V. This specification is guaranteed across the full –40°C to 125°C temperature range and does not require external clamping diodes.
Does SN74LVCH245APWRE4 support hot-plug operation?
Yes, SN74LVCH245APWRE4 supports hot-plug operation via its Ioff feature: when VCC = 0 V, the outputs are actively disabled and leakage remains below ±10 µA, preventing damaging back-current flow into powered subsystems. This behavior is verified per JESD78 and is essential for modular telecom and server chassis designs.
How does the bus-hold function work on SN74LVCH245APWRE4?
The bus-hold circuit in SN74LVCH245APWRE4 uses internal feedback to maintain the last-valid logic state on each A/B port input - eliminating need for external pull-up or pull-down resistors. It draws ±75 µA at 3 V and remains active regardless of OE or DIR state, ensuring stable inputs even during configuration transitions or signal glitches.
What is the propagation delay of SN74LVCH245APWRE4 at 1.8 V VCC?
At VCC = 1.8 V and TA = 25°C, SN74LVCH245APWRE4 exhibits a maximum propagation delay (tpd) of 12.7 ns for A↔B data transfer, as specified in the –40°C to 85°C switching characteristics table. This value increases slightly to 13.7 ns over the full –40°C to 125°C range, maintaining timing predictability in thermally demanding environments.
Is SN74LVCH245APWRE4 pin-compatible with SN74LVC245A?
Yes, SN74LVCH245APWRE4 is pin-compatible with SN74LVC245A in the TSSOP-20 (PW) package - sharing identical pin assignments for DIR, OE, A1–A8, B1–B8, VCC, and GND. However, SN74LVCH245APWRE4 adds bus-hold and enhanced Ioff functionality not present in SN74LVC245A, enabling drop-in replacement where those features are beneficial.
SN74LVCH245APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVCH245APWRE4 FAQ
1.How can I place an order for SN74LVCH245APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245APWRE4 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 SN74LVCH245APWRE4 reliable?
The price and inventory of SN74LVCH245APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVCH245APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH245APWRE4 transactions.
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4.How is shipping managed for SN74LVCH245APWRE4?
SN74LVCH245APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245APWRE4 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 SN74LVCH245APWRE4?
For technical support, including SN74LVCH245APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245APWRE4 requirements.
6.How does Aetrix verify that SN74LVCH245APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245APWRE4 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 SN74LVCH245APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVCH245APWRE4?
All SN74LVCH245APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245APWRE4, 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 SN74LVCH245APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVCH245APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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