SN74AHCT7541-Q1 - Automotive Octal Buffer, Open-Drain | TI
料号： SN74AHCT7541-Q1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.56 | $5.60 |
| 100 | $0.44 | $44.00 |
| 500 | $0.38 | $190.00 |
| 1,000 | $0.32 | $320.00 |
SN74AHCT7541-Q1 概述
An octal buffer is a digital IC providing eight independent buffer channels used to increase fan-out, drive capacitive loads, or interface between voltage domains. With open-drain outputs, the device sinks current to ground when active, which makes it ideal for driving LEDs and implementing wired-OR logic. Schmitt-trigger inputs add hysteresis for superior noise immunity in automotive and industrial environments.
Key features include the 4.5V to 5.5V supply range, open-drain outputs suited to external pull-up voltages above VCC, and inputs that tolerate slow edge rates thanks to Schmitt-trigger hysteresis. Per the TI datasheet, the device drives loads with total capacitance up to 50pF while meeting all datasheet specifications; larger capacitive loads are possible but not recommended. Output low-level current capability is defined by the VOL/IO characteristics in the Electrical Characteristics table.
Technically, the device uses Advanced High-Speed CMOS TTL-compatible (AHCT) technology, balancing speed and power. External pull-up resistors define the output high level, a critical design consideration for wired-OR buses and mixed-voltage interfacing. The -40C to +125C operating range suits under-hood and body-electronics environments.
Typical applications include automotive dashboard indicator LED drivers, level shifting between 5V and higher-voltage domains, wired-OR interrupt lines, and industrial control I/O requiring high noise immunity.
Design tip: size pull-up resistors for the desired high level and sink current, tie OE1/OE2 appropriately, and place a 0.1uF decoupling capacitor close to the VCC pin.
直接替换替代料： SN74AHCT7541-Q1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SN74AHCT7541QPWR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74AHC7541QPWRQ1
✅ 直接替换📋 参考替代料（不在目录中）
SN74AHC9541-Q1
⚡ 相同封装✓ 有现货
联系询价
查看数据手册 →SN74AHCT541QPWRQ1
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74AHCT7541-Q1 最大额定值与电气特性
| 功能 | Octal buffer, non-inverting, open-drain outputs |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Number of Channels | 8 |
| Bits per Element | 8 |
| 输出类型 | Open Drain |
| Output Enable | OE1, OE2 (active low, both must be low) |
| Input Type | Schmitt Trigger |
| Maximum Capacitive Load (per datasheet) | 50 pF |
| Technology Family | AHCT |
| 工作温度 | -40C to +125C |
| Qualification | AEC-Q100 (automotive) |
| ESD Protection | HBM |
| 封装 | 20-TSSOP (PW) |
| 安装类型 | Surface Mount |
| Polarity | Non-Inverting |
SN74AHCT7541-Q1 引脚配置
| 引脚 1 | OE1 — Output enable 1 (active low; both OE1 and OE2 low to enable) |
| 引脚 2 | 1A1 — Channel 1 input (Schmitt trigger) |
| 引脚 3 | 2A1 — Channel 2 input |
| 引脚 4 | GND — Ground |
| 引脚 5 | 2A2 — Channel 3 input |
| 引脚 6 | 1A2 — Channel 4 input |
| 引脚 7 | 2A3 — Channel 5 input |
| 引脚 8 | 1A3 — Channel 6 input |
| 引脚 9 | 2A4 — Channel 7 input |
| 引脚 10 | 1A4 — Channel 8 input |
| 引脚 19 | OE2 — Output enable 2 (active low) |
| 引脚 20 | VCC — Supply voltage, 4.5V to 5.5V |
典型应用
SN74AHCT7541-Q1 适用于 6 应用s: Automotive Dashboard LED Indicators, Wired-OR Interrupt Lines, 5V Logic Level Shifting to Higher Rails, Industrial Control I/O Buffering, Microcontroller GPIO Fan-Out Expansion, Body Control Module Signal Multiplexing.
Automotive Dashboard LED Indicators
The SN74AHCT7541-Q1's open-drain outputs sink LED return current directly to ground, making it ideal for driving dashboard telltales and indicator clusters. Each of the eight channels drives an LED with an external series resistor, and the AEC-Q100 qualification with +125C grade ensures reliability in elevated cabin temperatures. Because outputs are open drain, LED supply rails above the 5V logic rail can be used without level-shift circuitry, simplifying mixed-voltage cluster designs.
推荐
Wired-OR Interrupt Lines
Open-drain outputs from multiple SN74AHCT7541-Q1 channels or multiple devices can share a single pull-up resistor to form a wired-OR interrupt bus. Any device asserting low pulls the line low, and the active-low OE1/OE2 enables let a controller tri-state its outputs during bus arbitration. Schmitt-trigger inputs provide hysteresis against the slow edges typical of RC-loaded wired-OR lines, improving noise immunity in electrically noisy automotive body-control modules.
推荐
5V Logic Level Shifting to Higher Rails
Because the open-drain outputs tolerate external pull-up voltages independent of VCC, the SN74AHCT7541-Q1 shifts 5V logic to higher rails such as 12V or 24V automotive supply domains. The pull-up resistor sets the high level while the buffer sinks current to ground on logic lows. Designers must size the resistor so sink current remains within the VOL/IO limits in the Electrical Characteristics table, and observe the 50pF recommended capacitive-load limit.
推荐
Industrial Control I/O Buffering
In PLC and factory automation I/O modules, the SN74AHCT7541-Q1 buffers 5V control signals to optocoupler LEDs and status indicators. Schmitt-trigger inputs accept slow, noisy edges from long wiring runs without oscillation, while the -40C to +125C range covers cabinet environments. The eight channels consolidate buffering that would otherwise require discrete transistors, and the open-drain outputs directly drive grounded-emitter optocoupler inputs through current-limiting resistors.
推荐
Microcontroller GPIO Fan-Out Expansion
The device expands limited MCU GPIO drive capability: one 5V microcontroller port can control eight open-drain outputs, each handling its own pull-up load. This suits relay-module pilots, status LEDs, and low-side switching of small loads. Per the TI datasheet, the AHCT input thresholds are TTL-compatible, ensuring solid margin with 5V CMOS microcontrollers, and a 0.1uF decoupling capacitor at VCC plus the 50pF load limit keep switching transitions clean.
推荐
Body Control Module Signal Multiplexing
Within body-control modules, the SN74AHCT7541-Q1 multiplexes multiple sensor or switch signals onto shared open-drain buses. The dual active-low enables (OE1 and OE2, both required low) implement ANDed gating from two controllers, preventing bus contention. AEC-Q100 qualification, HBM ESD protection, and Schmitt-trigger input hysteresis address the harsh electrical environment of automotive harnesses, including load-dump-adjacent transients and slow risetimes on long lines.
推荐
推荐产品汇总
工程参考数据： SN74AHCT7541-Q1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SN74AHCT7541QPWR | SN74AHC7541QPWRQ1 | SN74AHC9541-Q1 |
|---|---|---|---|---|
| Package | 20-TSSOP (PW) | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same | TSSOP-20 / wettable-flank QFN |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Type | Open Drain | Open Drain | Open Drain | 3-State (totem pole) |
| Supply Voltage Range | 4.5V to 5.5V | 4.5V to 5.5V | 2V to 5.5V | 2V to 5.5V |
| Input Thresholds | TTL-compatible (AHCT) + Schmitt trigger | TTL-compatible (AHCT) | CMOS (AHC) | CMOS (AHC) |
| Automotive Qualification | AEC-Q100, -40C to +125C | No (standard grade) | Yes (AEC-Q100) | Yes (AEC-Q100) |
| Output Enable | OE1, OE2 active low (both low to enable) | OE1, OE2 active low | OE1, OE2 active low | Dual active-low OE |
关键差异点
- Open-drain outputs enable wired-OR and high-voltage pull-up interfacing （对比 SN74AHC9541-Q1)
- AEC-Q100 automotive qualification with +125C grade （对比 SN74AHCT7541QPWR)
- TTL-compatible thresholds with Schmitt-trigger hysteresis （对比 SN74AHC7541QPWRQ1)
设计说明
Open-drain outputs require external pull-up resistors to define VOH. Size the resistor per the TI datasheet relation RL >= VO / IO using the VOL/IO values in the Electrical Characteristics table. Excessive sink current degrades VOL and increases power; too-large resistors slow rising edges, which is acceptable here because Schmitt-trigger inputs tolerate slow edges on the receiving side.
Place a 0.1uF ceramic decoupling capacitor within 2mm of the VCC pin (pin 20) with a low-impedance ground return. Keep pull-up resistor traces short to reduce radiated emissions during output switching. The TSSOP-20 thermal pad requirements are modest since this logic device dissipates little static power, but ensure the GND pin (pin 4) connects to a solid ground plane.
Do not exceed 50pF total capacitive load per output; larger loads can be driven but no longer meet datasheet timing specifications per TI's guidance. Remember that both OE1 and OE2 must be low for outputs to be active - leaving one floating will disable all eight channels. Tie unused enables deliberately and never rely on an unconnected OE pin.
合规信息
AEC-Q100 qualified per TI product page. RoHS/REACH/lead-free status not stated in retrieved data - verify on TI quality page.
