Texas Instruments SN64BCT757DWRE4

Overview

SN64BCT757DWRE4 from Texas Instruments is an octal noninverting buffer/driver with complementary 3-state enable inputs and open-collector outputs, rated for –40°C to 85°C operation, 64 mA sink current per output, and 5 V supply voltage. It drives bus lines or memory address registers in high-density memory and clock distribution systems.

For engineers reviewing the SN64BCT757DWRE4 datasheet, SN64BCT757DWRE4 pinout, SN64BCT757DWRE4 application, or SN64BCT757DWRE4 equivalent, key selection criteria include open-collector drive capability, BiCMOS low ICCZ quiescent current, power-up/power-down high-impedance behavior, and SOIC-20 package compatibility with legacy 300-mil DIP footprints.

Technical Context

The SN64BCT757DWRE4 implements dual complementary enable logic (1OE and 2OE) controlling eight independent noninverting open-collector drivers. Each output supports up to 64 mA sink current at VOL ≤ 0.55 V under 4.5–5.5 V VCC.

Its BiCMOS process enables low ICCZ (10 mA typical with all outputs open), ESD protection >2000 V (HBM), and guaranteed high-impedance state during power transitions-critical for hot-swap and bus arbitration applications without bus contention.

Key Specifications

Pinout & Package

SN64BCT757DWRE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, with 1.27 mm pitch and RoHS-compliant NiPdAu lead finish (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal open-collector buffer applications.

Compared with SN74BCT757N and SN74ACT757DW, the SN64BCT757DWRE4 delivers optimal balance of industrial temperature range, 64 mA drive, and SOIC-20 manufacturability - making it the preferred choice for volume production of 5 V bus-buffering applications requiring reliability and legacy compatibility.

Availability

SN64BCT757DWRE4 is available at Aetrix Electronics and suitable for memory address buffering, bus transceiver interfaces, and clock distribution networks requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for SN64BCT757DWRE4 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 founded in 1930, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.

The SN64BCT757DWRE4 belongs to TI's BCT logic family, designed specifically to replace bipolar TTL in high-density memory and bus systems while retaining pinout and voltage compatibility - emphasizing low ICCZ, open-collector flexibility, and robust ESD performance.

FAQ

What is the maximum sink current per output on the SN64BCT757DWRE4?

The SN64BCT757DWRE4 supports up to 64 mA sink current per open-collector output at VCC = 4.5 V and VOL ≤ 0.55 V. This rating is specified under recommended operating conditions and enables direct driving of terminated 50 Ω transmission lines or multiple standard TTL loads without external current amplification. The SN64BCT757DWRE4 maintains this performance across its full –40°C to 85°C industrial temperature range.

Does the SN64BCT757DWRE4 have built-in power-up and power-down protection?

Yes, the SN64BCT757DWRE4 guarantees high-impedance output states during power-up and power-down transitions. This behavior is inherent to its BiCMOS design and eliminates bus contention in systems where supply sequencing is uncontrolled. The SN64BCT757DWRE4 achieves this without external circuitry, making it suitable for hot-swap and modular backplane applications where reliable isolation is critical.

Is the SN64BCT757DWRE4 compatible with 3.3 V logic inputs?

No, the SN64BCT757DWRE4 is not 3.3 V logic-input compatible. Its input thresholds are TTL-specific: VIH = 2.0 V minimum and VIL = 0.8 V maximum at VCC = 5 V. While it may accept 3.3 V HIGH signals in many cases, TI does not guarantee correct switching or noise immunity below 2.0 V. For guaranteed 3.3 V interface, consider the SN74ACT757DW instead - but note its reduced 24 mA IOL versus the SN64BCT757DWRE4.

What package type and moisture sensitivity level does the SN64BCT757DWRE4 use?

The SN64BCT757DWRE4 uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.5 mm body width, and 2.65 mm max height. It carries an MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning it can be stored and assembled without dry-pack or baking requirements. The device features NiPdAu lead finish and complies with RoHS Directive 2011/65/EU.

Can the SN64BCT757DWRE4 replace the SN74LS244 in existing designs?

Yes, the SN64BCT757DWRE4 is a functional and pin-compatible upgrade for the SN74LS244 in 5 V systems. It retains identical pinout, logic function (octal noninverting buffer), and TTL-compatible inputs, while improving IOL (64 mA vs. 24 mA), reducing ICCZ, adding ESD protection (>2000 V HBM), and extending temperature range to –40°C to 85°C. No PCB changes are needed, and the SN64BCT757DWRE4 delivers measurable reliability and performance gains over the legacy LS part.