LTC6702HDC#TRMPBF - Tiny Dual Comparator, 5.5V | Analog Devices
MPN: LTC6702HDC#TRMPBF ✓ Hoạt độngLTC6702HDC#TRMPBF Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho LTC6702HDC#TRMPBF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC6702HDC#TRMPBF (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Output Type, Package, RoHS Status.
LTC6702IDC#TRMPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC6702HDC#PBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC6702HDC#TRMPBF Tỷ lệ tối đa & tính chất điện
| Product Type | Dual Comparator |
| Number of Comparators | 2 |
| Kiểu đầu ra | 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 |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C (H grade) |
| Hộp | 8-pin DFN (2 mm x 2 mm) with Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes (PBF suffix) |
| Manufacturer | Analog Devices (formerly Linear Technology) |
Cấu hình chân LTC6702HDC#TRMPBF
| Chân 1 | OUTA — Comparator A push-pull output |
| Chân 2 | INA- — Comparator A inverting input |
| Chân 3 | INA+ — Comparator A non-inverting input |
| Chân 4 | V- — Negative supply (ground) |
| Chân 5 | INB+ — Comparator B non-inverting input |
| Chân 6 | INB- — Comparator B inverting input |
| Chân 7 | OUTB — Comparator B push-pull output |
| Chân 8 | V+ — Positive supply (1.7 V to 5.5 V) |
| Chân 9 | EP — Exposed pad - thermal pad, solder to V- plane |
Ứng dụng tiêu biểu
LTC6702HDC#TRMPBF phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC6702HDC#TRMPBF — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Smallest 5V dual comparator footprint with push-pull output (vsLegacy LM393 (SOIC-8))
- Rail-to-rail input common-mode range (vsTL331 (single comparator, SOT-23-5))
- H-grade temperature range for automotive/industrial (vsLTC6702IDC#TRMPBF (I-grade))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
