LTC6702HDC#PBF - Tiny Micropower Dual Comparator | Analog Devices
MPN: LTC6702HDC#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.75 | $3.75 |
| 10 | $3.38 | $33.80 |
| 100 | $2.99 | $299.00 |
| 500 | $2.69 | $1,345.00 |
| 1,000 | $2.39 | $2,390.00 |
LTC6702HDC#PBF Overview
A comparator is an analog building block that compares two input voltages and switches its output to logic high or low depending on which input is larger. Dual comparators integrate two independent comparators on a single die, which lowers board area, BOM cost, and channel-to-channel delay mismatch in window detectors, threshold sensors, and clock-recovery circuits. Within the broader signal-chain hierarchy, the LTC6702HDC#PBF sits inside the amplifier/comparator product family, which itself belongs to the data-conversion and analog-frontend tier of a power-management and signal-conditioning system.
Key features include an input offset voltage of 3.5 mV maximum at 3 V supply, rail-to-rail input common-mode range that extends beyond both supply rails, push-pull CMOS/TTL-compatible outputs that eliminate the need for an external pull-up resistor, and a low quiescent current optimized for battery-powered applications. Internal hysteresis is provided to prevent output chatter in noisy environments, and the inputs tolerate transients beyond the supply rails without latch-up.
The device uses a CMOS process with a precision input stage and a fast decision stage, achieving 500 ns typical response time while keeping total supply current in the microamp range. This combination of speed and low power is unusual and stems from Analog Devices' bias-current scaling technique that adjusts the input-stage current in proportion to the input transition rate, conserving power during static DC conditions.
Typical applications include battery-powered window comparators, threshold detectors and discriminators, clock regeneration in low-power oscillators, automotive sensing and control modules, and general-purpose signal conditioning where two comparators are needed on the same supply rail. Designers often use the LTC6702HDC#PBF in Li-ion powered products where its 1.7 V minimum supply allows operation directly from a single discharged battery cell.
When laying out the PCB, connect the exposed pad to a low-impedance ground plane to minimize thermal resistance and provide a stable reference for the input stage. Place supply bypass capacitors as close as possible to the V+ pin to avoid supply ringing during fast output transitions.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not provided together on the official manufacturer datasheet. Engineers can use the comparison table and FAQ below to evaluate second-source options and to plan decoupling, layout, and battery-life trade-offs in one place.
Drop-in alternatives for LTC6702HDC#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC6702HDC#PBF (same form factor and footprint) — differing in Operating Temperature Range, Output Type, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6702CDC#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6702IDC#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6702HDC#TRMPBF
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →LTC6702HDC#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6702CDC
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6702IDC#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6702HDC#PBF Maximum Ratings & Electrical Characteristics
| Product Type | Dual Comparator |
| Number of Comparators | 2 |
| Output Type | CMOS, Push-Pull, Rail-to-Rail, TTL |
| Supply Voltage (Single) | 1.7 V to 5.5 V |
| Input Offset Voltage (Max) | 3.5 mV @ 3 V |
| Propagation Delay (Typ) | 500 ns |
| Common-Mode Input Range | Rail-to-Rail (exceeds both rails) |
| Operating Temperature Range | -40 C to +125 C |
| Package | 8-DFN (2x2 mm) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| Hysteresis | Internal |
| RoHS Status | Compliant (PBF suffix) |
LTC6702HDC#PBF Pin Configuration
| Pin 1 | V+ — Positive supply voltage (1.7 V to 5.5 V) |
| Pin 2 | IN1+ — Non-inverting input of comparator 1 |
| Pin 3 | IN1- — Inverting input of comparator 1 |
| Pin 4 | OUT1 — Push-pull output of comparator 1 |
| Pin 5 | GND — Ground |
| Pin 6 | OUT2 — Push-pull output of comparator 2 |
| Pin 7 | IN2- — Inverting input of comparator 2 |
| Pin 8 | IN2+ — Non-inverting input of comparator 2 |
| Pin EP | Exposed Pad — Connect to GND plane for thermal/electrical grounding |
Typical Applications
LTC6702HDC#PBF is suitable for 6 applications: Battery-Powered Window Comparator, Threshold Detector / Discriminator, Clock Regeneration Circuit, Automotive Sensing and Control, Battery-Powered IoT Sensor Front-End, Industrial Process Control Module.
Battery-Powered Window Comparator
The LTC6702HDC#PBF fits window-comparator designs that monitor a battery cell voltage against upper and lower thresholds. Its 1.7 V minimum supply lets both channels run directly from a single discharged Li-ion cell without a boost converter, while the rail-to-rail inputs accept ground-referenced and V+-referenced thresholds from a simple resistor divider. The 500 ns propagation delay is sufficient for over-voltage and under-voltage alarms that do not require sub-microsecond response, and the micropower quiescent current minimizes drain on the monitored cell. Compared with a discrete dual-op-amp solution, the LTC6702HDC#PBF halves board area, eliminates a resistor-network reference, and provides internal hysteresis to suppress noise-induced false trips.
Recommended
Threshold Detector / Discriminator
Use the LTC6702HDC#PBF in single-threshold detector circuits where a clean logic output is needed when an analog signal crosses a fixed reference. The push-pull CMOS/TTL output drives a microcontroller GPIO directly without an external pull-up resistor, simplifying interface to 3.3 V or 5 V MCUs. The 3.5 mV maximum input offset keeps detection accuracy tight around the threshold, while internal hysteresis prevents output chatter when the input is near the trip point. This application is common in sensor front-ends, alarm circuits, and pulse-width discriminators where a stable, low-power comparator is required.
Recommended
Clock Regeneration Circuit
The LTC6702HDC#PBF can square up a degraded clock or data line and recover a clean logic-level signal at the output. Its 500 ns propagation delay limits maximum input frequencies to roughly 1 MHz, which suits baseband clock regeneration in low-speed serial links, IR remote receivers, and magnetic-pickup ignition modules. The wide 1.7 V to 5.5 V supply range allows the part to operate from the same rail as the recovered-clock load, eliminating level shifters. Rail-to-rail inputs accept clock edges that swing from GND to V+, simplifying AC-coupling.
Recommended
Automotive Sensing and Control
In 12 V automotive body-control modules, the LTC6702HDC#PBF can monitor analog signals such as battery voltage, switch positions, and sensor outputs after resistive dividers bring them within the 1.7 V to 5.5 V supply range. The -40 C to +125 C operating range covers the AEC-Q100 temperature profile required for under-hood and cabin modules, and the push-pull output drives 5 V logic cleanly. The micropower quiescent current suits always-on monitoring tasks such as door-switch wake-up circuits and battery-isolation detection. Compared with built-in MCU comparators, the LTC6702HDC#PBF offers a separate, well-defined reference point and reduces firmware burden.
Recommended
Battery-Powered IoT Sensor Front-End
The LTC6702HDC#PBF is well-suited as the analog wake-up front-end for an IoT sensor node that spends most of its life in deep sleep. The two comparators can monitor a sensor signal and a battery-voltage threshold simultaneously, waking the host MCU only when an event occurs. The microamp-level quiescent current minimizes sleep-mode drain, and the 1.7 V minimum supply keeps the comparators alive down to the end of a Li-ion discharge curve. The 2x2 mm DFN footprint fits inside the most space-constrained wearable or wireless-sensor PCB layouts.
Recommended
Industrial Process Control Module
In factory-automation modules, the LTC6702HDC#PBF can be used for analog signal conditioning, where a 4-20 mA loop or 0-10 V transducer output must be compared against programmable limits to drive a relay or alert line. The rail-to-rail inputs accept ground-referenced loop currents, and the CMOS/TTL push-pull output interfaces to PLC logic inputs. The 500 ns response time is sufficient for process-alarm timing, and the wide supply range allows the comparator to share the 24 V->5 V derived rail of the module. Industrial temperature grade (-40 C to +125 C) ensures reliable operation in cabinet environments.
Recommended
Recommended Products Summary
Engineering reference data for LTC6702HDC#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6702CDC#PBF | LTC6702IDC#PBF | LTC6702HDC#TRMPBF | LTC6702HDC#TRPBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-DFN (2x2) | 8-DFN (2x2) - same | 8-DFN (2x2) - same | 8-DFN (2x2) - same | 8-DFN (2x2) - same |
| Temperature Grade | H: -40 C to +125 C | C: 0 C to +70 C | I: -40 C to +85 C | H: -40 C to +125 C | H: -40 C to +125 C |
| Supply Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V |
| Output Type | CMOS/TTL Push-Pull, Rail-to-Rail | CMOS/TTL Push-Pull, Rail-to-Rail | CMOS/TTL Push-Pull, Rail-to-Rail | CMOS/TTL Push-Pull, Rail-to-Rail | CMOS/TTL Push-Pull, Rail-to-Rail |
| Propagation Delay (Typ) | 500 ns | 500 ns | 500 ns | 500 ns | 500 ns |
| Input Offset Voltage (Max) | 3.5 mV @ 3 V | 3.5 mV @ 3 V | 3.5 mV @ 3 V | 3.5 mV @ 3 V | 3.5 mV @ 3 V |
| Packaging Form | Tray / Tube | Tray / Tube | Tray / Tube | Tape & Reel, 500/reel | Tape & Reel, 2.5k/reel |
Key Differentiators
- Lowest minimum supply voltage in a tiny 8-DFN package (vs LTC6702CTS8)
- Internal hysteresis prevents output chatter (vs LTC6702CDC#PBF)
- Push-pull CMOS/TTL output eliminates external pull-up (vs Open-drain comparators)
Design Notes
Estimated: the LTC6702HDC#PBF draws microamp-level quiescent current per channel at V+ = 3 V. Place a 0.1 uF X7R ceramic bypass capacitor as close as possible to the V+ pin (pin 1) and a 1 uF bulk capacitor on the supply rail if it is shared with switching loads. Bypass placement within 2 mm of the V+ pin minimizes supply ringing during fast output transitions.
Solder the exposed pad (EP) to a continuous ground plane with multiple thermal vias to a second layer. Estimated: this keeps theta_JA low enough that the part remains within its operating range even at +125 C ambient. Without the EPAD grounded, the input stage reference can drift, degrading offset voltage performance.
Do not reverse the supply polarity; the LTC6702HDC#PBF has no reverse-battery protection and absolute maximum ratings are not specified for negative V+. Also avoid leaving the inputs floating - tie unused inputs to a defined voltage within the common-mode range (GND or V+) to prevent output oscillation and excess supply current.
Route input traces as differential pairs with a ground reference to minimize noise coupling, and keep input traces away from switching nodes. Estimated: a 4-mil trace separation with continuous ground underneath keeps capacitive coupling below 1 pF, which is small compared to the input stage design values.
Compliance Information
Lead-free (#PBF suffix) per the manufacturer datasheet. H grade spans -40 to +125 C, which overlaps the AEC-Q100 Grade 1 temperature range but the part is not formally AEC-Q100 qualified per the datasheet markings. Designers should verify automotive qualification status with Analog Devices directly for AEC-Q100 use.
