TLV3502 - 4.5ns Dual Rail-to-Rail Comparator | Texas Instruments
MPN: TLV3502 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.55 | $2.55 |
| 10 | $2.3 | $23.00 |
| 100 | $1.95 | $195.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.38 | $1,380.00 |
TLV3502 Overview
A comparator is an analog IC that compares two input voltages and outputs a digital signal indicating which is higher. Within the signal chain, comparators bridge analog sensing and digital processing, converting analog thresholds into logic levels. The TLV3502 belongs to the high-speed comparator family, a subset of linear comparators in the broader analog-to-digital interface IC hierarchy.
Key features include the 4.5ns propagation delay, 6mV internal hysteresis for noise immunity, and an input common-mode range extending 0.2V beyond the supply rails. The push-pull CMOS output stage directly drives CMOS or TTL logic without an external pull-up resistor. CMOS inputs provide picoampere-level input bias current, ideal for high-impedance sources. Note that the dual TLV3502 has no shutdown function; shutdown is available only on the single-channel TLV3501.
Architecturally, the CMOS process delivers low power and high input impedance. The rail-to-rail input stage senses signals near either supply rail, critical in low-voltage designs, while the output sources and sinks current to drive capacitive loads. The device is specified from -40C to +125C.
Typical applications include zero-crossing detectors, window comparators, level shifters, high-speed signal conditioning in test and measurement equipment, PWM circuits, and high-frequency oscillators. The 3.2mA supply current also benefits battery-powered portable instruments.
For reliable design, bypass the supply with a 0.1uF capacitor close to the VCC pin and respect the input common-mode range to avoid output errors.
Drop-in alternatives for TLV3502 — 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:
TLV3502AIDR
✅ Drop-In📋 Reference alternative (not in catalog)
TLV3502AIDCNT
✅ Drop-In📋 Reference alternative (not in catalog)
TLV3502AIDCNR
✅ Drop-In📋 Reference alternative (not in catalog)
TLV3502-Q1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM393DR
⚡ Same Package✓ In Stock
$0.11 / Unit
View Datasheet →TLV3502 Maximum Ratings & Electrical Characteristics
| Channels | 2 (dual) |
| Propagation Delay | 4.5 ns |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Supply Current | 3.2 mA |
| Input Hysteresis | 6 mV (internal) |
| Input Common-Mode Range | Extends 0.2 V beyond rails |
| Output Type | CMOS, Push-Pull, Rail-to-Rail (CMOS/TTL compatible) |
| Input Bias Current | picoampere-level (CMOS input) |
| Operating Temperature | -40C to +125C |
| Packages | 8-SOIC (D), 8-SOT-23 (DCN) |
| Mounting Type | Surface Mount |
| Logic Compatibility | CMOS, TTL |
| Shutdown Function | No (TLV3501 only) |
| RoHS Status | Compliant |
| Family | TLV350x high-speed comparator |
TLV3502 Pin Configuration
| Pin 1 | OUT A — Channel A output (push-pull CMOS) |
| Pin 2 | IN A- — Channel A inverting input |
| Pin 3 | IN A+ — Channel A non-inverting input |
| Pin 4 | V- (GND) — Negative supply / ground |
| Pin 5 | IN B- — Channel B inverting input |
| Pin 6 | IN B+ — Channel B non-inverting input |
| Pin 7 | OUT B — Channel B output (push-pull CMOS) |
| Pin 8 | VCC — Positive supply, 2.7 V to 5.5 V |
Typical Applications
TLV3502 is suitable for 6 applications: Zero-Crossing Detection, High-Speed Signal Conditioning - Test & Measurement, Window Comparators, Level Shifting and Logic Translation, PWM and Oscillator Circuits, Portable and Battery-Powered Instruments.
Zero-Crossing Detection
The TLV3502's 4.5ns propagation delay and rail-to-rail input make it ideal for AC line and signal zero-crossing detection where timing accuracy matters. The 6mV internal hysteresis suppresses chatter from noise near the crossing point, and the input common-mode range extending 0.2V beyond the rails allows sensing small signals near ground. In a typical circuit, one input is grounded and the AC signal drives the other; the push-pull CMOS output directly clocks a microcontroller timer without an external pull-up, yielding sub-10ns timing uncertainty at 3.3V or 5V logic.
Recommended
High-Speed Signal Conditioning - Test & Measurement
In oscilloscope front ends, frequency counters, and pulse analyzers, the TLV3502 converts fast analog waveforms to logic levels with only 4.5ns delay and low channel-to-channel skew. The dual channels enable differential or window comparisons in one 8-pin package, reducing BOM and board area. Supply current is 3.2mA per channel, modest for the speed class, easing portable instrument power budgets. The rail-to-rail output cleanly drives CMOS/TTL logic at up to 5.5V, and the CMOS picoampere input bias preserves accuracy with high-impedance probes or dividers.
Recommended
Window Comparators
The dual channels of the TLV3502 naturally implement window comparators for over/under-voltage monitoring of supply rails, sensor outputs, or battery packs. One channel flags undervoltage while the other flags overvoltage; OR-ing the outputs yields a single fault signal. The 2.7V to 5.5V supply range covers 3.3V and 5V monitoring systems, and the 6mV hysteresis provides clean switching near thresholds. The push-pull output eliminates pull-up resistors required by open-collector comparators like the LM393, saving components and improving rise-time consistency in digital monitoring buses.
Recommended
Level Shifting and Logic Translation
Because the TLV3502 input common-mode range extends 0.2V beyond the supply rails and its push-pull output swings fully rail-to-rail, it performs clean analog level translation between signal domains. A small signal referenced to a lower domain can be compared against a threshold in a 3.3V or 5V system, producing a valid CMOS/TTL logic level at up to 5.5V. The 4.5ns delay adds negligible latency compared with dedicated level-shifter ICs, and CMOS picoampere input bias keeps source loading minimal for high-impedance analog sources.
Recommended
PWM and Oscillator Circuits
The TLV3502 builds high-frequency relaxation oscillators and PWM comparators where propagation delay sets the achievable frequency. With 4.5ns delay, oscillator frequencies in the tens of MHz are practical, far beyond the reach of general-purpose comparators like the LM393. The dual channels support an oscillator plus a duty-cycle comparator on one die, improving timing correlation between sections. The push-pull output drives logic directly, and the 6mV hysteresis stabilizes oscillation amplitude against supply noise in 3.3V and 5V systems.
Recommended
Portable and Battery-Powered Instruments
At 3.2mA per channel from a 2.7V to 5.5V supply, the TLV3502 suits battery-powered handheld instruments, sensors, and data loggers that still need fast threshold decisions. The 8-SOT-23 microsize package minimizes board area in space-constrained wearables and portable meters. Rail-to-rail inputs sense battery-derived signals near ground or the positive rail as the pack discharges, maintaining accuracy across the full battery voltage range. While the dual TLV3502 lacks shutdown, per-channel current remains low enough for duty-cycled designs.
Recommended
Recommended Products Summary
Engineering reference data for TLV3502 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLV3502AIDR | TLV3502AIDCNT | TLV3502-Q1 | LM393DR |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) / 8-SOT-23 (DCN) | 8-SOIC (D) - same footprint | SOT-23-8 (DCN) - same footprint | 8-SOIC (D) - same footprint | 8-SOIC (D) - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Propagation Delay | 4.5 ns | 4.5 ns | 4.5 ns | 4.5 ns | ~1.3 us |
| Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2 V to 36 V |
| Output Stage | Push-pull CMOS, rail-to-rail | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS | Open-collector |
| Hysteresis | 6 mV internal | 6 mV internal | 6 mV internal | 6 mV internal | None (external only) |
| Shutdown | No | No | No | No | No |
Key Differentiators
- Ultra-fast 4.5ns propagation delay (vs LM393DR)
- Push-pull CMOS output - no pull-up resistor (vs LM393DR)
- Built-in 6mV hysteresis and over-rail common-mode range (vs LM393DR)
Design Notes
Bypass VCC with a 0.1uF ceramic capacitor placed within a few millimeters of pin 8, plus a 1uF bulk capacitor nearby. The TLV3502 switches in 4.5ns, generating fast supply transients; inadequate decoupling causes ground bounce and false triggering. Route V- return with a low-inductance ground plane rather than a thin trace.
Avoid driving inputs outside the input common-mode range; although it extends 0.2V beyond the rails, signals significantly below V- or above VCC+0.2V can cause output phase reversal or damage. Tie unused channel inputs to a defined potential (e.g., both to ground via the inputs) per TI E2E guidance - never leave them floating, as CMOS inputs pick up noise and the unused output may oscillate.
Keep the input traces short and, for differential signals, route them as a matched pair to preserve the 4.5ns delay advantage. The 6mV internal hysteresis helps with moderate noise, but for sources with high slew or reflection, add a small external positive-feedback resistor network for additional hysteresis. Minimize stub length on outputs driving long logic traces.
The 8-SOT-23 (DCN) package exposes no thermal pad, but thermal performance is adequate at 3.2mA/channel. For the 8-SOIC, keep high-speed output traces away from the inputs to prevent crosstalk-induced retriggering in window-comparator layouts.
Compliance Information
RoHS compliant per TI product documentation. AEC-Q100 qualification applies to TLV3502-Q1 variant, not standard grade.
