LTC6702HDC#TRMPBF - Tiny Dual Comparator, 5.5V | Analog Devices
料号： LTC6702HDC#TRMPBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.18 | $318.00 |
| 500 | $2.86 | $1,430.00 |
| 1,000 | $2.55 | $2,550.00 |
LTC6702HDC#TRMPBF 概述
A comparator is an analog building block that compares two input voltages and produces a digital output indicating which input is larger. The LTC6702HDC integrates two independent comparators with internal hysteresis, rail-to-rail input common-mode range, and complementary push-pull output stages capable of driving CMOS or TTL logic loads directly without external pull-up resistors. The part sits within the broader power-management hierarchy: voltage monitor -> comparator -> analog building block -> mixed-signal IC -> semiconductor.
Key features of the LTC6702HDC include a 500 ns typical propagation delay, 32 uA typical quiescent current per comparator (microampere-class power consumption), 65 dB common-mode rejection, and an operating temperature range of -40 C to +125 C. The dual-comparator topology allows window comparators, dual-threshold battery monitors, and zero-crossing detectors in a single chip. The push-pull output eliminates the static current draw of open-drain comparators through external pull-ups, an important consideration for battery life.
Architecturally, the LTC6702 uses a low-power CMOS input stage with a fast decision latch and CMOS/TTL-compatible output drivers, achieving a balance between quiescent current and edge speed that simpler micropower comparators cannot match. The exposed die-pad package provides a low thermal-resistance path, important when both comparators switch simultaneously at high toggling rates. Designers benefit from the lack of requirement for a separate reference rail.
Typical applications include low-battery detection in single-cell Li-ion and 2x/3x AA-powered portable electronics, window comparators for power-good monitoring in 1.8V/3.3V rails, level translation between analog signals and 1.8V GPIO domains, multichannel sensor threshold detection in IoT endpoints, and zero-crossing detectors in audio or motor control. The 8-pin DFN package fits beneath QFNs and 8-pin MSOP footprints on most boards.
Designers should note that the LTC6702HDC's H grade suffix denotes the -40 C to +125 C automotive/industrial temperature range; pin-compatible C-grade (0 C to +70 C) and I-grade (-40 C to +85 C) variants are available in the same DFN-8 footprint. Decoupling of the supply pin with a 0.1 uF ceramic capacitor placed within 2 mm of the V+ pin is recommended for stable comparator operation.
This page synthesizes Analog Devices datasheet parameters, distributor availability, and drop-in alternatives within the LTC6702 family not always presented together on single-source distributor pages.
直接替换替代料： LTC6702HDC#TRMPBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC6702HDC#TRMPBF （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, Output Type, Package, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
LTC6702IDC#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6702HDC#PBF
✅ 直接替换✓ 有现货
$2.39 / 个
查看数据手册 →LTC6702HDC#TRMPBF 最大额定值与电气特性
| Product Type | Dual Comparator |
| Number of Comparators | 2 |
| 输出类型 | CMOS, Push-Pull, TTL-compatible, Rail-to-Rail |
| Supply Voltage (V+) | 1.7 V to 5.5 V |
| Supply Current (typical) | 32 uA per comparator |
| Propagation Delay (typical) | 500 ns |
| Input Common-Mode Range | Rail-to-Rail |
| Common-Mode Rejection Ratio (CMRR) | 65 dB |
| 工作温度范围 | -40 C to +125 C (H grade) |
| 封装 | 8-pin DFN (2 mm x 2 mm) with Exposed Pad |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
| Lead-Free / Halogen-Free | Yes (PBF suffix) |
| Manufacturer | Analog Devices (formerly Linear Technology) |
LTC6702HDC#TRMPBF 引脚配置
| 引脚 1 | OUTA — Comparator A push-pull output |
| 引脚 2 | INA- — Comparator A inverting input |
| 引脚 3 | INA+ — Comparator A non-inverting input |
| 引脚 4 | V- — Negative supply (ground) |
| 引脚 5 | INB+ — Comparator B non-inverting input |
| 引脚 6 | INB- — Comparator B inverting input |
| 引脚 7 | OUTB — Comparator B push-pull output |
| 引脚 8 | V+ — Positive supply (1.7 V to 5.5 V) |
| 引脚 9 | EP — Exposed pad - thermal pad, solder to V- plane |
典型应用
LTC6702HDC#TRMPBF 适用于 6 应用s: Low-Battery Voltage Monitor for Single-Cell Li-ion, Window Comparator for Power-Good Detection, Zero-Crossing Detector for Audio/Motor Control, Level Shifter Between Analog and 1.8V GPIO, Multichannel Sensor Threshold Detector, Automotive Sensor Interface (H-Grade).
Low-Battery Voltage Monitor for Single-Cell Li-ion
The LTC6702HDC#TRMPBF is ideal for single-cell Li-ion low-battery detection because it operates from 1.7 V to 5.5 V with only 32 uA quiescent current, eliminating the need for a boost regulator before the monitor itself. According to the Analog Devices 6702fa datasheet, comparator A is wired as a 3.0 V threshold detector against a precision reference, with output driving the host MCU's reset or interrupt pin. The 500 ns propagation delay is fast enough for power-down sequencing, and the rail-to-rail input allows direct sensing of battery voltage down to 1.7 V without a divider. The DFN-8 (2x2 mm) package fits beneath QFNs in compact wearable and IoT sensor boards.
推荐
Window Comparator for Power-Good Detection
The LTC6702HDC#TRMPBF's dual-comparator topology is well suited for window comparator power-good monitoring on 1.8 V and 3.3 V rails. According to the Analog Devices 6702fa datasheet, one comparator checks the upper threshold (overvoltage) and the other checks the lower threshold (undervoltage), with outputs combined through a single resistor-logic gate. The push-pull CMOS/TTL outputs drive 1.8 V GPIO directly without level shifters, and the rail-to-rail input common-mode range tracks rail voltages from 1.7 V to 5.5 V. The 65 dB CMRR rejects supply noise that would otherwise cause false triggers during DC-DC load transients, making it a robust supervisory companion for FPGA and processor rails.
推荐
Zero-Crossing Detector for Audio/Motor Control
Zero-crossing detection benefits from the LTC6702HDC#TRMPBF's 500 ns propagation delay and rail-to-rail input common-mode range, which together allow clean detection of sinusoidal signals at audio frequencies up to 100 kHz. According to the Analog Devices 6702fa datasheet, the input pair is wired as a comparator against ground, with the push-pull output generating a digital pulse aligned to each AC zero crossing. The 32 uA quiescent current keeps power consumption negligible in always-on audio monitoring, and the 8-pin DFN footprint enables integration into compact speaker-driver and motor-control PCBs where board area is constrained.
推荐
Level Shifter Between Analog and 1.8V GPIO
The LTC6702HDC#TRMPBF's CMOS/TTL push-pull output stage is a natural level translator between analog signals and 1.8 V microcontrollers. According to the Analog Devices 6702fa datasheet, the comparator's input accepts analog signals from 0 V to V+, and the output drives 1.8 V GPIO directly without external level-shifter ICs. This eliminates a discrete level translator that would otherwise draw mA-class quiescent current; the LTC6702's 32 uA per comparator is far lower. The DFN-8 (2x2 mm) footprint occupies roughly 60% less board area than SOIC-8 translators, enabling dense sensor interfaces in IoT endpoints.
推荐
Multichannel Sensor Threshold Detector
For multichannel sensor threshold detection, the LTC6702HDC#TRMPBF's dual-comparator package reduces part count by 50% compared to single comparators. According to the Analog Devices 6702fa datasheet, each comparator can be assigned to a separate sensor channel (e.g., temperature, light, motion) with independent thresholds set by resistor dividers. The 500 ns propagation delay is adequate for slow-changing sensor signals, and the rail-to-rail input common-mode range simplifies sensor-bridge interfaces where signals swing across most of the supply range. The micropower 32 uA quiescent current enables continuous sensor monitoring in battery-powered IoT nodes that wake the host only when thresholds are crossed.
推荐
Automotive Sensor Interface (H-Grade)
The LTC6702HDC (H-grade) variant operates across -40 C to +125 C, making it suitable for underhood and cabin automotive sensor interfaces. According to the Analog Devices 6702fa datasheet, the part supports 5 V automotive rails, with the rail-to-rail input range covering 0 V to 5 V sensor signals common in resistive sensor bridges. The push-pull CMOS/TTL outputs interface directly with 3.3 V or 5 V automotive MCUs, and the 65 dB CMRR rejects ignition-system transients. Designers should pair it with the LTC6101 current-sense amplifier or ISO7761 digital isolator for safety-critical interfaces, and verify AEC-Q100 qualification status via the manufacturer before PPAP submission.
推荐
推荐产品汇总
工程参考数据： LTC6702HDC#TRMPBF ——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 | LTC6702IDC#TRMPBF | LTC6702HDC#PBF | LTC6702CTS8#TRMPBF | LTC6702ITS8#TRMPBF |
|---|---|---|---|---|---|
| Brand | Analog Devices (Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-pin DFN (2x2 mm) | 8-pin DFN (2x2 mm) - same | 8-pin DFN (2x2 mm) - same | TSOT-23-8 - different | TSOT-23-8 - different |
| Operating Temperature | -40C to +125C (H-grade) | -40C to +85C (I-grade) | -40C to +125C (H-grade) | 0C to +70C (C-grade) | -40C to +85C (I-grade) |
| Supply Voltage | 1.7V to 5.5V | 1.7V to 5.5V | 1.7V to 5.5V | 1.7V to 5.5V | 1.7V to 5.5V |
| Propagation Delay | 500 ns (typical) | 500 ns | 500 ns | 500 ns | 500 ns |
| Quiescent Current | 32 uA per comparator | 32 uA | 32 uA | 32 uA | 32 uA |
| Output Type | CMOS/TTL Push-Pull | CMOS/TTL Push-Pull | CMOS/TTL Push-Pull | CMOS/TTL Push-Pull | CMOS/TTL Push-Pull |
| Drop-in Pin Compatibility | Yes (reference part) | Yes (same DFN-8) | Yes (same DFN-8) | No (TSOT-23-8 footprint) | No (TSOT-23-8 footprint) |
关键差异点
- Smallest 5V dual comparator footprint with push-pull output （对比 Legacy LM393 (SOIC-8))
- Rail-to-rail input common-mode range （对比 TL331 (single comparator, SOT-23-5))
- H-grade temperature range for automotive/industrial （对比 LTC6702IDC#TRMPBF (I-grade))
设计说明
Decouple the V+ pin (pin 8) with a 0.1 uF X5R/X7R ceramic capacitor placed within 2 mm of the IC. According to Analog Devices 6702fa datasheet typical application, this decoupling prevents supply-noise coupling into the input stage that could trigger false comparator transitions. For battery-powered applications drawing heavy pulsed loads (e.g., radio TX), add a 1 uF bulk capacitor in parallel. The 32 uA quiescent current is consumed per comparator, so total Iq in dual-active mode is approximately 64 uA - budget this into battery-life calculations for always-on monitors.
Solder the exposed pad (pin 9, bottom of DFN-8) to a V- plane copper pour of at least 5 mm x 5 mm. According to Analog Devices 6702fa datasheet PCB layout guidelines, this provides a low thermal-impedance path for heat dissipation when both comparators toggle simultaneously at high rates. Without the exposed pad soldered, theta_JA rises dramatically and can trigger thermal shutdown at high ambient temperatures. Avoid routing signal traces beneath the exposed pad area; use the same net (V-) for the entire copper pour to maximize thermal conductivity.
Do not apply input voltages that exceed V+ or go below V- by more than 0.3 V without external protection; ESD diodes will forward-bias and inject current into the supply rail. According to Analog Devices 6702fa datasheet absolute maximum ratings, the inputs are protected but not designed for continuous overdrive. When monitoring a battery voltage that can exceed V+ during charging, add a series resistor (10 kohm minimum) or Schottky clamp. Also note that the push-pull outputs can source/sink up to 25 mA - avoid short-circuiting OUTA or OUTB to V+ or V- for sustained periods.
When using the LTC6702 as a zero-crossing detector, route input traces differentially and keep them short and symmetric. According to Analog Devices 6702fa datasheet, mismatched input trace lengths convert common-mode noise to differential noise that can cause spurious switching. Place the input resistor divider close to the IC pins and bypass the reference voltage (if used) with a 0.1 uF capacitor. For high-impedance input networks (>100 kohm), add a 10 pF capacitor across the inputs to limit bandwidth and reduce RF susceptibility in noisy environments.
合规信息
RoHS and REACH compliant per Analog Devices product page. PBF suffix indicates lead-free terminal finish. AEC-Q100 status not explicitly stated in retrieved web data; automotive applications should verify qualification via Analog Devices support before PPAP submission.
