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Texas Instruments SN74CBTR16861DLR
- Part No.:
- SN74CBTR16861DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTR16861DLR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
SN74CBTR16861DLR from Texas Instruments is a 20-bit FET bus switch organized as two independent 10-bit switches, featuring 25-Ω on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation across –40°C to 85°C. It enables high-speed bidirectional signal routing in memory expansion and data-path isolation applications with minimal propagation delay (tpd = 1.25 ns at VCC = 4 V).
For engineers reviewing the SN74CBTR16861DLR datasheet, SN74CBTR16861DLR pinout, SN74CBTR16861DLR application, or SN74CBTR16861DLR equivalent, key selection criteria include on-resistance matching, OE-controlled bidirectional switching behavior, thermal performance (θJA = 63°C/W for DL package), and compatibility with 5-V TTL logic systems requiring low-noise signal integrity.
Technical Context
The SN74CBTR16861DLR implements dual 10-bit FET-based analog switches with separate OE controls per bank. Each switch exhibits symmetrical A↔B conduction when OE is low, and high-impedance isolation when OE is high - enabling precise data-path gating without directionality constraints.
Its 25-Ω typical on-resistance is matched across channels and stable over voltage and temperature, reducing signal reflection noise and eliminating need for external termination. The device meets JESD 78 Class II latch-up immunity (>100 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM), supporting robust operation in mixed-signal PCB environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 20–48 Ω typical; ensures minimal voltage drop and signal attenuation during active switching. |
| Propagation delay (tpd) | 1.25 ns at VCC = 4 V; supports >800 MHz data-rate signal routing with sub-nanosecond timing fidelity. |
| Supply voltage range | 4 V to 5.5 V; compatible with standard 5-V TTL and mixed-voltage I/O domains. |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V; guarantees reliable OE activation using legacy 5-V TTL drivers. |
| Thermal resistance (θJA) | 63°C/W (DL package); defines maximum power dissipation limit under natural convection cooling. |
| ESD protection | 2000-V HBM, 200-V MM; satisfies industrial-level electrostatic robustness requirements without external protection. |
| Latch-up immunity | >100 mA per JESD 78 Class II; prevents destructive latch-up during transient overcurrent events. |
Pinout & Package
SN74CBTR16861DLR uses a 48-pin SSOP (DL) package with 0.63 mm lead pitch, JEDEC MO-118 compliant footprint, and 11.35 mm × 16.2 mm body dimensions. Pin 1 is located in Quadrant Q1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A10, 2A1–2A10 | Input/Output Port A (Bank 1 & 2) | Bidirectional signal terminals for first and second 10-bit data paths; electrically identical to B-side pins. |
| 1B1–1B10, 2B1–2B10 | Input/Output Port B (Bank 1 & 2) | Paired with corresponding A pins; forms low-resistance conductive path when OE is asserted. |
| 1OE, 2OE | Output-enable control (active-low) | Independent enable for each 10-bit bank; drives switch ON (low) or high-Z (high). |
| VCC | Power supply | Single 4–5.5 V rail powers all internal FETs and level-shifting circuitry. |
| GND (Pins 11, 22) | Ground reference | Dual ground pins reduce ground bounce and improve noise margin in high-speed switching. |
| NC (Pins 1, 48) | No internal connection | Unbonded pads; must remain unconnected to avoid mechanical stress or parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω matched on-resistance | Enables uniform signal transmission across all 20 channels, minimizing skew and reflection-induced jitter. |
| TTL-compatible control inputs | Eliminates need for level shifters when interfacing with legacy 5-V microcontrollers or FPGAs. |
| Independent dual OE controls | Allows selective activation of Bank 1 or Bank 2 - critical for time-multiplexed memory or peripheral arbitration. |
| No external termination required | Integrated series resistance suppresses ringing on PCB traces up to 10 cm, simplifying layout and reducing BOM count. |
| High ESD and latch-up immunity | Supports handling and operation in non-ESD-controlled manufacturing and field-repair environments. |
Applications
| Memory Expansion Interface | Data Bus Isolation |
|---|---|
Use Scenario: Adding SRAM or Flash memory to a microcontroller with limited address/data bus pins. IC Role / Device Role / Timing Role: Bidirectional 20-bit bus switch that routes shared address/data lines between MCU and multiple memory devices under OE control. Use Value: Enables space-constrained designs to expand memory capacity without adding bus buffers or complex glue logic. |
Use Scenario: Preventing back-driving between two active digital subsystems sharing a common data bus. IC Role / Device Role / Timing Role: High-speed isolation gate that disconnects subsystems during reset or configuration phases. Use Value: Eliminates contention-induced signal corruption and reduces system-level debug time for bus arbitration failures. |
| Hot-Swappable Peripheral Hub | TTL-Level Signal Multiplexing |
Use Scenario: Enabling safe insertion/removal of add-on modules (e.g., sensor cards) while main controller remains powered. IC Role / Device Role / Timing Role: Controlled break-before-make switching element that isolates module I/O before reconfiguration. Use Value: Prevents power-up sequencing conflicts and protects host logic from hot-plug transients. |
Use Scenario: Sharing a single UART or SPI interface among multiple peripherals using time-division multiplexing. IC Role / Device Role / Timing Role: Low-latency bidirectional path selector synchronized to master clock edges. Use Value: Reduces pin count on resource-limited MCUs while maintaining full-duplex communication capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210DLR | 24-bit, single OE control, higher ron (26–50 Ω), same DL package. | Lacks independent bank control; unsuitable for asymmetric bus gating. | Select when full 24-bit routing is needed and dual OE is unnecessary. |
| SN74CBTLV3245PWR | 8-bit, dual-supply (1.65–3.6 V), lower ron (3–6 Ω), TSSOP-24 package. | Designed for low-voltage LVTTL/LVCMOS systems; incompatible with 5-V TTL control levels. | Select only for 3.3-V or mixed-voltage domains where SN74CBTR16861DLR's 5-V tolerance is not required. |
Compared with SN74CBTR16861DLR, SN74CBT16210DLR offers more bits but less flexible control, while SN74CBTLV3245PWR delivers lower on-resistance at the cost of 5-V incompatibility - making SN74CBTR16861DLR the optimal choice for legacy 5-V TTL bus isolation with dual-bank timing control.
Availability
SN74CBTR16861DLR is available at Aetrix Electronics and suitable for memory expansion interfaces, data bus isolation, hot-swappable peripheral hubs, and TTL-level signal multiplexing requiring stable component supply across industrial temperature ranges.
Supply support for SN74CBTR16861DLR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74CBTR16861DLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in 5-V TTL systems where signal integrity and timing predictability are critical.
FAQ
What is the operating temperature range for SN74CBTR16861DLR?
The SN74CBTR16861DLR is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's recommended operating conditions and supported by thermal characterization (θJA = 63°C/W) in the DL package. The device maintains specified on-resistance, propagation delay, and switching thresholds across this full range, making SN74CBTR16861DLR suitable for deployment in non-climate-controlled industrial enclosures and outdoor equipment.
Does SN74CBTR16861DLR support bidirectional signal flow?
Yes, SN74CBTR16861DLR supports fully bidirectional signal flow between Port A and Port B for each 10-bit channel. When OE is low, the internal FET switch conducts equally in either direction - no inherent source/drain polarity is enforced. This allows SN74CBTR16861DLR to route data, addresses, or control signals in both directions without external direction-control logic, unlike unidirectional translators or level shifters.
Can SN74CBTR16861DLR be used with 3.3-V logic systems?
SN74CBTR16861DLR is designed for 4–5.5 V operation and requires VCC ≥ 4 V to meet its specified performance. While it may function at 3.3 V in some cases, TI does not characterize or guarantee parameters such as on-resistance, propagation delay, or VIH/VIL thresholds below 4 V. For reliable 3.3-V operation, SN74CBTR16861DLR is not recommended; instead, consider TI's CBTLV or LVC families explicitly rated for 3.3-V use.
What is the maximum continuous current per channel for SN74CBTR16861DLR?
The absolute maximum continuous channel current for SN74CBTR16861DLR is 128 mA, as specified in the Absolute Maximum Ratings table. However, for reliable long-term operation within recommended conditions, TI recommends limiting steady-state current to ≤64 mA per channel - the test condition used to specify typical on-resistance (20–47 Ω). Exceeding this may increase self-heating and degrade timing or resistance stability in SN74CBTR16861DLR.
How does SN74CBTR16861DLR handle unused control inputs?
All unused control inputs on SN74CBTR16861DLR - including OE pins not in use - must be held statically at either VCC or GND to prevent floating states that could cause partial turn-on, increased ICC, or unpredictable switching. TI's application report SCBA004 explicitly warns against leaving CMOS control inputs unconnected. For SN74CBTR16861DLR, tying unused OE to VCC (to disable that bank) or GND (to enable it) via a 10-kΩ pull-up/down resistor is the recommended practice.
SN74CBTR16861DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTR
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74CBTR16861DLR FAQ
1.How can I place an order for SN74CBTR16861DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTR16861DLR 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 SN74CBTR16861DLR reliable?
The price and inventory of SN74CBTR16861DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTR16861DLR is usually 5 days.
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Once your SN74CBTR16861DLR 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 SN74CBTR16861DLR?
For technical support, including SN74CBTR16861DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTR16861DLR requirements.
6.How does Aetrix verify that SN74CBTR16861DLR is sourced from the original manufacturer or authorized distributors?
All SN74CBTR16861DLR 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 SN74CBTR16861DLR meets industry standards.
7.What is the process for return or replacement of SN74CBTR16861DLR?
All SN74CBTR16861DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTR16861DLR, 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 SN74CBTR16861DLR part is unused and in its original packaging.
Return procedure for SN74CBTR16861DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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