LTC6752HSC6-4 - 280MHz, 2.9ns Comparator, SC-70-6 | Analog Devices
MPN: LTC6752HSC6-4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.5 | $2.50 |
| 10 | $2.45 | $24.50 |
| 100 | $2.2 | $220.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.65 | $1,650.00 |
LTC6752HSC6-4 Overview
A comparator is an analog building block that compares two input voltages and produces a digital logic output indicating which input is larger. Comparators are foundational to high-speed signal chains: they convert analog waveforms (sine, triangular, photodiode current pulses) into clean logic-level transitions that downstream counters, ADCs, or FPGAs can time-stamp. Within the broader power management and signal chain taxonomy, a high-speed comparator like the LTC6752 sits between analog sensors and digital decision logic, and its speed directly determines the timing accuracy of any system that uses it for threshold detection.
Key specifications include 280 MHz toggle rate, 2.9 ns propagation delay (typical), 1.2 ns rise/fall times, rail-to-rail input common-mode range, CMOS output stage, separate VIN/VOUT supplies, and operating temperature range of -40 C to +125 C. According to the manufacturer datasheet, the part is recommended for new designs and operates from a 2.45 V to 5.25 V input supply. The CMOS output stage delivers clean logic levels and avoids the high input bias current of older bipolar comparators.
The LTC6752 family includes 5 members differentiated by options such as separate input and output supplies, shutdown pin, output latch, adjustable hysteresis, and complementary outputs. The -4 package suffix selects the SC-70-6 footprint, the smallest in the family. The architecture focuses on low dispersion and stable propagation delay across input overdrive, making it well suited for time-critical applications.
Typical applications include high-speed instrumentation, time-of-flight sensing, threshold detection in pulse circuits, clock and data recovery, motor control feedback, and clock buffer replacement in digital systems. The wide input range and CMOS output make it particularly valuable when an analog signal must be detected against a moving threshold.
When designing with this device, place the decoupling capacitor as close to the supply pin as possible, keep input traces short to minimize parasitic capacitance, and account for the 2.9 ns propagation delay when calculating system timing margins. Latch and hysteresis options (where present in the family) improve noise immunity but trade off against maximum toggle rate.
This page synthesizes distributor pricing, drop-in alternatives across the LTC6752 family, and practical high-speed layout guidance not found in the manufacturer datasheet alone.
Drop-in alternatives for LTC6752HSC6-4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6752ISC6-4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6752HSC6-4#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6752HSC6-4#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6752HSC6-4#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6752HSC6-1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6752HSC6-4 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices |
| Part Number | LTC6752HSC6-4 |
| Comparator Type | General Purpose / Standard |
| Number of Comparators | 1 (Single) |
| Output Type | CMOS |
| Toggle Rate | 280 MHz |
| Propagation Delay | 2.9 ns (typical) |
| Rise / Fall Time | 1.2 ns |
| Input Common-Mode Range | Rail-to-Rail |
| Input Supply Range (V) | 2.45 V to 5.25 V |
| Output Supply (Separate) | Yes (VIN separate from VOUT) |
| PSRR | 74 dB (typical) |
| Operating Temperature | -40 C to +125 C |
| Package | SC-70-6 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 1 |
| Lifecycle Status | Recommended for new designs |
LTC6752HSC6-4 Pin Configuration
| Pin 1 | OUT — CMOS logic output |
| Pin 2 | VOUT — Output stage supply (separate from VIN) |
| Pin 3 | IN- — Inverting input (rail-to-rail) |
| Pin 4 | IN+ — Non-inverting input (rail-to-rail) |
| Pin 5 | GND — Ground |
| Pin 6 | VIN — Input stage supply (2.45 V to 5.25 V) |
Typical Applications
LTC6752HSC6-4 is suitable for 6 applications: High-Speed Threshold Detection, Laser Time-of-Flight Receiver, Clock and Data Recovery (CDR), Motor Control Current Sensing, Pulse Width Measurement / Time-to-Digital, RF Envelope Detection.
High-Speed Threshold Detection
The LTC6752HSC6-4 excels at threshold detection in pulsed signal chains because of its 2.9 ns propagation delay and 1.2 ns rise/fall time. Place the comparator between a fast analog sensor (photodiode, current transformer, or RF detector) and a downstream FPGA or counter; the rail-to-rail inputs accept signals that swing from ground to VDD without level shifting. At 280 MHz toggle rate the part can resolve pulses at sub-5 ns separation, which slower comparators (TLV3201 at 200 ns delay) cannot. The CMOS output drives a 50 ohm trace directly into an FPGA LVCMOS input when VOUT is biased to the FPGA bank voltage.
Recommended
Laser Time-of-Flight Receiver
In time-of-flight (ToF) laser rangefinders the LTC6752HSC6-4 functions as the pulse-detection front end that converts the returning optical pulse (after transimpedance amplification) into a clean CMOS logic edge timestamped by an FPGA TDC. The 2.9 ns delay contributes only centimeters of ranging error at the speed of light, while the rail-to-rail inputs accept the full dynamic range of the photodiode preamp. The separate VIN and VOUT supply rails let the analog front end run on 5 V while the output stage directly drives a 3.3 V FPGA bank, eliminating a level translator.
Recommended
Clock and Data Recovery (CDR)
Clock and data recovery loops in serial-link receivers use a high-speed comparator as the slicer that converts the equalized analog eye into a binary data stream. The LTC6752HSC6-4 with its 280 MHz toggle rate and 2.9 ns delay supports NRZ data rates up to several hundred Mbps, while the CMOS output cleanly drives the downstream CDR phase detector. The 74 dB PSRR (per Analog Devices datasheet) rejects supply noise that would otherwise translate into jitter on the recovered clock.
Recommended
Motor Control Current Sensing
In BLDC or stepper motor drives, the LTC6752HSC6-4 detects zero-crossing of the back-EMF signal or trips an overcurrent threshold from a low-side shunt amplifier. The 2.9 ns response time protects power FETs within microseconds of a short-circuit event, far faster than the microcontroller ADC sampling path. The rail-to-rail inputs handle the common-mode swing as the phase node commutates, while the CMOS output directly drives the gate-driver enable or fault input. The -40 C to +125 C operating range tolerates under-hood automotive temperatures.
Recommended
Pulse Width Measurement / Time-to-Digital
The LTC6752HSC6-4 is widely used as the input stage to a TDC (time-to-digital converter) implemented in an FPGA, where its 2.9 ns propagation delay and sub-nanosecond jitter set the floor on timing resolution. The rail-to-rail inputs accept start/stop signals from pulse sources, photodiodes, or nuclear instrumentation preamps. Pairing the comparator with an FPGA LVCMOS input (with VOUT biased to the FPGA bank voltage) yields a measurement chain with deterministic sub-3 ns delay.
Recommended
RF Envelope Detection
Envelope detectors for AM demodulation, RSSI measurement, and RF power monitoring use a high-speed comparator to square the detected baseband. The LTC6752HSC6-4 converts the slow envelope ripple into a logic-level PWM signal that a microcontroller can count or a Sigma-Delta ADC can digitize. The 280 MHz toggle rate ensures the comparator is never the bandwidth bottleneck, even on multi-MHz modulated carriers, and the CMOS output cleanly interfaces with low-power MCUs.
Recommended
Recommended Products Summary
Engineering reference data for LTC6752HSC6-4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6752ISC6-4 | LTC6752HSC6-4#TRMPBF | LTC6752HSC6-4#TRPBF | LTC6752HSC6-4#PBF | LTC6752HSC6-1 |
|---|---|---|---|---|---|---|
| Package | SC-70-6 | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same | SC-70-6 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Toggle Rate | 280 MHz | 280 MHz | 280 MHz | 280 MHz | 280 MHz | 280 MHz |
| Propagation Delay | 2.9 ns | 2.9 ns | 2.9 ns | 2.9 ns | 2.9 ns | 2.9 ns |
| Rise / Fall Time | 1.2 ns | 1.2 ns | 1.2 ns | 1.2 ns | 1.2 ns | 1.2 ns |
| Operating Temperature | -40 C to +125 C (H grade) | -40 C to +85 C (I grade) | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Separate VOUT Supply | Yes | Yes | Yes | Yes | Yes | No (single supply only) |
| Input Supply Range | 2.45 V to 5.25 V | 2.45 V to 5.25 V | 2.45 V to 5.25 V | 2.45 V to 5.25 V | 2.45 V to 5.25 V | 2.45 V to 5.25 V |
Key Differentiators
- Highest toggle rate in SC-70-6 single comparator class (vs TLV3201 (SC-70-5))
- Separate VIN and VOUT supply rails (vs LTC6752HSC6-1 (single-supply variant))
- Rail-to-rail input common-mode range (vs LMV7219 (SC-70-5))
Design Notes
Place a 0.1 uF X7R ceramic bypass capacitor within 2 mm of the VIN pin and a second 0.1 uF next to the VOUT pin. The separate VIN/VOUT rails mean each supply needs its own decoupling. Keep input traces short (under 5 mm) and route them away from switching nodes to prevent coupling of common-mode noise into the 280 MHz comparator. Use a continuous ground pour under the device to provide a low-impedance return path for the 1.2 ns edge transitions.
The 1.2 ns rise/fall time produces significant harmonic content above 200 MHz. Treat the output trace as a transmission line - 50 ohm controlled impedance with a series damping resistor (22-33 ohm) at the driver when the trace length exceeds 10 mm or the load is capacitive. Probe the output with a low-inductance ground-spring tip to avoid measuring the probe loop rather than the actual edge rate.
Do not exceed the 5.25 V absolute maximum on VIN or VOUT - the CMOS output stage ESD structures are not forgiving of transients above 6 V. When driving the output into a different logic domain (e.g., 3.3 V FPGA from a 5 V VOUT supply), bias VOUT to the FPGA bank voltage, not ground. Finally, avoid running long input traces parallel to switching power traces; the rail-to-rail input stage will pick up common-mode noise that toggles the output spuriously.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Lead-free finish indicated by TRMPBF suffix. AEC-Q100 not specifically qualified - automotive applications should verify with manufacturer.
