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Texas Instruments SN74ALVTHR16245LR
- Part No.:
- SN74ALVTHR16245LR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVTHR16245LR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,695
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Product details
Overview
SN74ALVTHR16245LR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for 2.5-V/3.3-V VCC operation and mixed-mode interfacing (5-V inputs/outputs). It features ±12 mA drive strength at 3.3 V, integrated bus-hold circuitry, Ioff support for hot insertion, and flow-through pinout in a 48-pin SSOP package. It is used in backplane data routing between 3.3-V logic and legacy 5-V subsystems.
For engineers reviewing the SN74ALVTHR16245LR datasheet, SN74ALVTHR16245LR pinout, SN74ALVTHR16245LR application, or SN74ALVTHR16245LR equivalent, key selection criteria include bidirectional 16-bit data translation capability, hot-plug compatibility via Ioff and power-up 3-state, bus-hold elimination of external resistors, 30-Ω output series termination, and SSOP-48 thermal performance (θJA = 63°C/W).
Technical Context
This device implements two independent 8-bit transceiver sections, each controlled by dedicated DIR (direction) and OE (output enable) inputs. Data flows either A→B or B→A depending on DIR logic level, while OE places all outputs in high-impedance state for bus isolation.
It uses Advanced BiCMOS Technology (ABT) to achieve low static power dissipation and high-speed switching (tPHL/tPLH ≤ 3.9 ns at 3.3 V, CL = 50 pF), with distributed VCC/GND pins and flow-through architecture minimizing PCB trace congestion and ground bounce (VOLP < 0.8 V at VCC = 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - supports both 2.5-V and 3.3-V system rails with TTL-compatible 5-V input tolerance. |
| Drive Strength | ±12 mA at 3.3 V - enables direct interface to standard CMOS/TTL loads without external buffers. |
| Bus-Hold Current | IBHL = 75 µA (low), IBHH = –75 µA (high) at VCC = 3 V - actively holds floating inputs at valid logic levels, eliminating need for pullup/pulldown resistors. |
| Output Series Resistance | ≈30 Ω - integrated termination reduces overshoot/undershoot; no external resistors required for signal integrity. |
| Hot-Insertion Support | Ioff ≤ ±100 µA at VCC = 0 V - prevents damaging current backflow during live board insertion; power-up 3-state ensures high-Z before VCC stabilization. |
| Propagation Delay | tPLH/tPHL ≤ 3.9 ns (CL = 50 pF, VCC = 3.3 V) - meets timing requirements for high-speed parallel bus applications up to ~200 MHz effective data rate. |
| ESD Protection | HBM = 2000 V, MM = 200 V, CDM = 1000 V - exceeds JEDEC JESD22 standards for robust handling in manufacturing and field environments. |
Pinout & Package
SN74ALVTHR16245LR is housed in a 48-pin Shrink Small-Outline Package (SSOP, DL package), 12.6 mm × 6.2 mm × 1.2 mm max height, with 0.5-mm lead pitch and gull-wing leads. The package is RoHS-compliant and rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Determines data flow direction: DIR = L → B-to-A; DIR = H → A-to-B. |
| 1OE, 2OE | Output-enable input (per 8-bit section) | Active-low: OE = L enables transceiver; OE = H forces all outputs into high-impedance state for bus isolation. |
| 1A1–1A8, 2A1–2A8 | Port A data inputs/outputs | First and second 8-bit bidirectional data port connected to local bus or controller side. |
| 1B1–1B8, 2B1–2B8 | Port B data inputs/outputs | First and second 8-bit bidirectional data port connected to peripheral or legacy 5-V bus side. |
| VCC (Pins 7, 18, 29, 40) | Power supply | Distributed VCC pins minimize simultaneous switching noise and improve PDN stability across wide bus. |
| GND (Pins 4, 11, 22, 33, 44) | Ground reference | Five GND pins provide low-inductance return paths and reduce ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | Accepts 5-V inputs and drives 5-V loads while operating from 2.3–3.6-V VCC - enables seamless bridging between 3.3-V SoCs and legacy 5-V peripherals. |
| Integrated bus-hold | Eliminates need for external pullup/pulldown resistors on all A/B port inputs - reduces BOM count, PCB area, and layout complexity. |
| Flow-through pinout | Input and output pins arranged linearly (e.g., 1A1 adjacent to 1B1) - simplifies layer routing and minimizes trace crossovers in dense PCB layouts. |
| Output-series termination | 30-Ω on-chip series resistor per output - suppresses reflections and ringing on stub-loaded parallel buses without discrete components. |
| Hot-insertion readiness | Ioff and power-up 3-state ensure safe operation during live backplane insertion - prevents bus contention and latch-up during partial power-up sequences. |
Applications
| Industrial Backplane Interface | Embedded Controller Expansion |
|---|---|
|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to legacy 5-V I/O modules in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional 16-bit data translator enabling synchronous read/write cycles across voltage domains with sub-4-ns propagation delay. Use Value: Eliminates level-shifter ICs and external termination, reducing component count by ≥3 per bus segment while maintaining signal integrity at 20-MHz bus clock rates. |
Use Scenario: Expanding GPIO bandwidth between an ARM Cortex-M7 microcontroller and external memory-mapped peripherals in medical imaging systems. IC Role / Device Role / Timing Role: Dual-octal transceiver providing isolated, direction-controlled data path with bus-hold protection against floating states during reset or sleep transitions. Use Value: Prevents undefined bus states during firmware updates or brown-out recovery, avoiding spurious writes to safety-critical registers. |
| Telecom Line Card Bridging | Test Equipment Signal Routing |
|
Use Scenario: Isolating and translating control/data signals between 3.3-V baseband processors and 5-V analog front-end ASICs in 4G/LTE base station line cards. IC Role / Device Role / Timing Role: Hot-pluggable bus buffer supporting live card replacement without system reboot; Ioff blocks reverse current during partial power-down. Use Value: Enables carrier-grade redundancy with zero downtime during field-replaceable unit (FRU) swaps, meeting GR-63-CORE shock/vibration and MTBF requirements. |
Use Scenario: Configurable signal path routing in automated test equipment (ATE) where multiple DUT interfaces share a common 16-bit data bus. IC Role / Device Role / Timing Role: 3-state-enabled transceiver allowing dynamic bus arbitration among up to four instrument channels via OE control. Use Value: Reduces test head interconnect complexity by 60% versus discrete switches; flow-through layout cuts routing length by ≥40%, improving skew matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16245GR | No Ioff or bus-hold; lower drive (±8 mA); operates only at 3.3 V (not 2.5 V). | Suitable for fixed 3.3-V-only systems without hot-swap or floating-input risk. | Select SN74ALVCH16245GR only if mixed-voltage operation, hot insertion, and bus-hold are not required - reduces cost but sacrifices robustness. |
| SN74LVC16245ADGGR | Lower drive (±24 mA), no integrated 30-Ω termination, no bus-hold, wider VCC range (1.65–3.6 V). | Better for ultra-low-voltage designs (1.8 V) but requires external termination and pull resistors. | Choose SN74LVC16245ADGGR when scaling down to 1.8-V logic families; avoid if 5-V interface or layout simplification are priorities. |
Compared with SN74ALVCH16245GR and SN74LVC16245ADGGR, the SN74ALVTHR16245LR uniquely combines 5-V-tolerant I/O, hot-swap safety, bus-hold, and on-die termination - making it the only option for robust, drop-in-ready 16-bit bridging in industrial and telecom infrastructure where reliability and layout efficiency are critical.
Availability
SN74ALVTHR16245LR is available at Aetrix Electronics and suitable for industrial backplanes, embedded controller expansion, telecom line cards, and ATE signal routing requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for SN74ALVTHR16245LR 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 specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ALVTHR16245LR belongs to TI's Widebus™ ABT transceiver family, engineered specifically for high-reliability, mixed-voltage parallel bus interfacing in mission-critical infrastructure equipment.
FAQ
What voltage levels can SN74ALVTHR16245LR tolerate on its I/O pins?
The SN74ALVTHR16245LR accepts input voltages from 0 V to 5.5 V and drives outputs compatible with 5-V logic, even when powered from 2.3–3.6 V VCC. This allows direct connection to 5-V buses without external level shifters, while maintaining full functionality and ESD robustness per JESD22 standards.
Does SN74ALVTHR16245LR require external pullup or pulldown resistors on data lines?
No. The SN74ALVTHR16245LR integrates active bus-hold circuitry on all A and B port inputs, providing ±75 µA sustaining current to hold floating nodes at valid logic levels. Using external resistors with enabled bus-hold is explicitly discouraged in the datasheet and may degrade noise margin or increase power consumption.
How does SN74ALVTHR16245LR support hot insertion in backplane systems?
The SN74ALVTHR16245LR supports hot insertion through two mechanisms: Ioff limits current flow when VCC = 0 V (≤ ±100 µA), preventing backdrive damage; and power-up 3-state forces outputs into high-impedance until VCC exceeds 1.2 V, eliminating bus contention during partial power sequencing - both confirmed in SCES075D Section 6.2.
What is the significance of the 30-Ω series output resistance in SN74ALVTHR16245LR?
The SN74ALVTHR16245LR embeds ≈30-Ω series resistors on every output, matching typical PCB trace impedance to suppress reflections and reduce overshoot/undershoot. This eliminates the need for discrete 33-Ω resistors per line, cutting BOM cost and saving ≥16 mm² PCB area in a 16-bit implementation.
Can SN74ALVTHR16245LR operate reliably at 2.5 V VCC?
Yes. The SN74ALVTHR16245LR is fully specified for 2.5-V ±0.2-V operation per SCES075D Section 4, with guaranteed VOH ≥ 1.7 V, VOL ≤ 0.7 V, and tPLH/tPHL ≤ 4.3 ns (CL = 30 pF). Its ABT process ensures stable performance across the full 2.3–3.6-V VCC range without derating.
SN74ALVTHR16245LR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVTHR
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 2.3V ~ 2.7V, 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74ALVTHR16245LR FAQ
1.How can I place an order for SN74ALVTHR16245LR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVTHR16245LR 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 SN74ALVTHR16245LR reliable?
The price and inventory of SN74ALVTHR16245LR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVTHR16245LR is usually 5 days.
3.What payment methods are accepted for SN74ALVTHR16245LR?
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4.How is shipping managed for SN74ALVTHR16245LR?
SN74ALVTHR16245LR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVTHR16245LR 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 SN74ALVTHR16245LR?
For technical support, including SN74ALVTHR16245LR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVTHR16245LR requirements.
6.How does Aetrix verify that SN74ALVTHR16245LR is sourced from the original manufacturer or authorized distributors?
All SN74ALVTHR16245LR 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 SN74ALVTHR16245LR meets industry standards.
7.What is the process for return or replacement of SN74ALVTHR16245LR?
All SN74ALVTHR16245LR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVTHR16245LR, 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 SN74ALVTHR16245LR part is unused and in its original packaging.
Return procedure for SN74ALVTHR16245LR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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