LM2903TH-13 Dual Differential Comparator | Diodes
MPN: LM2903TH-13 ✓ ActiveLM2903TH-13 Overview
A comparator is an analog integrated circuit that compares two input voltages and produces a logic-level output indicating which input is higher. A differential comparator evaluates the voltage difference between its inverting and non-inverting inputs. This function is placed within the hierarchy of comparator integrated circuits, analog signal-processing ICs, semiconductor devices, and electronic control systems. Unlike a general-purpose operational amplifier used primarily for linear amplification, a comparator is optimized for fast, decisive output-state transitions.
The LM2903 family provides two channels in one package, reducing component count and PCB space in dual-threshold applications. Its 2 V to 36 V supply capability supports operation from low-voltage analog systems through substantially higher industrial voltage ranges. The 7 mV maximum input offset specification limits the input difference that can be recognized as a deliberate transition, making the device suitable for threshold monitoring when board-level signal integrity and input conditioning are properly controlled.
The dual differential architecture allows two independent comparisons within one IC. Each channel can monitor a sensor signal against a reference, supervise a supply rail, or establish an upper and lower control boundary. Its wide operating-voltage range is especially useful where input signals may exceed the nominal supply of a low-voltage controller. The 8-TSSOP package also supports compact surface-mount layouts, although thermal performance and unused-channel handling remain important design considerations.
Typical uses include industrial motor-control logic, power-supply supervision, temperature-sensor interfaces, battery monitoring, overvoltage detection, and general-purpose threshold switching. For dual-polarity sensing, the comparator can operate from single or dual supplies. For a single-supply design, the output reference and input signal levels must remain compatible with the supply voltage and the logic thresholds of the following digital device.
PCB design should keep sensitive comparison inputs away from switching nodes and high-current return paths. Place input-referenced components close to the corresponding pins, maintain a stable ground reference, and account for input bias current when using high-source-impedance sensors. If only one comparator channel is required, verify the manufacturer's guidance for the unused channel so that it does not introduce unstable behavior or excess switching activity.
This product page combines the LM2903TH-13 identification, package information, technical specifications, sourcing workflow, verified drop-in alternatives, and practical comparison guidance. It is intended to help engineers determine whether the dual comparator's voltage range, offset limit, pin compatibility, and surface-mount format match a specific analog-control design.
Drop-in alternatives for LM2903TH-13 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
LM393TH-13
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM2903PWR
✅ Drop-In📋 Reference alternative (not in catalog)
LM2903TH-13 Maximum Ratings & Electrical Characteristics
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Supply Voltage Range | 2 V to 36 V |
| Maximum Common-Mode Input Voltage | Approximately ±18 V |
| Maximum Input Offset Voltage | 7 mV |
| Comparator Category | Standard general-purpose comparator |
| Package | 8-pin TSSOP |
| Mounting Type | Surface mount |
| Number of Pins | 8 pins |
| Input Configuration | Differential |
| Operating Voltage | 2 V to 36 V |
| RoHS Compliance | RoHS3 compliant |
LM2903TH-13 8-pin tssop Pin Configuration Guide
Pin configuration for LM2903TH-13 (8-pin tssop package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM2903TH-13.
Refer to the datasheet for full pin configuration.
Typical Applications
LM2903TH-13 is suitable for 6 applications: Industrial Motor-Control Logic, Power-Supply Supervision, Temperature-Sensor Threshold Detection, Battery Monitoring, Overvoltage and Undervoltage Detection, Sensor Signal Conditioning.
Industrial Motor-Control Logic
The LM2903TH-13 fits motor-control logic that compares command, feedback, or limit-sensing voltages against adjustable references. Its two differential channels can supervise two independent conditions while operating from a supply within the 2 V to 36 V range. The 7 mV maximum input offset provides a defined threshold-uncertainty limit, so control signals should have margin above that value. The 8-TSSOP footprint saves board area, but traces carrying motor or switching signals should remain separated from comparator inputs to reduce false transitions.
Recommended
Power-Supply Supervision
The LM2903TH-13 can supervise a supply rail by comparing a scaled feedback voltage with a reference and driving a fault or enable signal when the monitored condition changes. Its supply range of 2 V to 36 V suits industrial and automotive-style power systems, while the differential inputs support sensing across a divided voltage rail. The 7 mV maximum offset must be included in the trip-point design, and the output should be checked for compatibility with the system logic. Input filtering is recommended when the monitored rail contains switching ripple.
Recommended
Temperature-Sensor Threshold Detection
A temperature-sensor signal can be compared with a reference using one channel of the LM2903TH-13, while the second channel handles an independent alarm or setpoint. The 7 mV maximum input offset is small relative to many externally scaled temperature signals, although sensor noise and reference accuracy may dominate the practical error. The wide 2 V to 36 V operating range permits use across varied control rails. Keep the high-impedance sensor node short and shield it from switching-node coupling to prevent nuisance comparator transitions.
Recommended
Battery Monitoring
The LM2903TH-13 is appropriate for battery systems that require discrete high, low, or overvoltage decisions. A resistive divider can scale a battery voltage into the comparator input range, and the 2 V to 36 V supply capability supports operation from low-voltage sensing rails to higher system voltages. The 7 mV maximum offset contributes to the trip-point uncertainty, alongside divider tolerance and reference accuracy. Input transient protection and filtering should be included because battery systems can experience load transients and common-mode excursions.
Recommended
Overvoltage and Undervoltage Detection
The two channels of the LM2903TH-13 can establish upper and lower monitoring limits around a shared reference. This arrangement supports window supervision in which the output changes state when a scaled rail moves outside the acceptable range. The 2 V to 36 V operating specification provides broad supply compatibility, and the 8-TSSOP package keeps the implementation compact. Designers should add hysteresis to prevent oscillation near each threshold and confirm that maximum input offset, divider error, and transient behavior satisfy the required detection accuracy.
Recommended
Sensor Signal Conditioning
The LM2903TH-13 can act as a discrete decision element after a sensor front end, comparing the conditioned signal against a precision reference to produce a digital status. Its differential input arrangement reduces dependence on a single input-node voltage and its dual-channel configuration allows two sensor outputs to be evaluated locally. The maximum 7 mV offset should be compared with the smallest sensor transition that must be recognized. High-impedance sensor lines require short routing, guarded construction, and careful grounding to preserve signal integrity.
Recommended
Recommended Products Summary
Engineering reference data for LM2903TH-13 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM393TH-13 | LM2903PWR |
|---|---|---|---|
| Package | 8-TSSOP | 8-TSSOP | 8-TSSOP |
| Brand | Diodes Incorporated | Diodes Incorporated | Texas Instruments |
| Comparator Configuration | Dual differential comparator | Dual comparator | Dual differential comparator |
Key Differentiators
- Single-package dual threshold detection (vs LM2903PWR)
- Wide supply-voltage capability (vs LM393TH-13)
- Defined maximum input offset (vs LM2903PWR)
Design Notes
Do not treat the 7 mV maximum input offset as the complete threshold error. Reference accuracy, comparator input bias current, sensor noise, resistor tolerance, and propagation delay also affect the switching point. For precision threshold detection, calculate the worst-case input-referred error, add deliberate hysteresis, and verify operation across supply-voltage and temperature corners using the manufacturer test conditions.
Use a quiet ground reference and keep the inverting and non-inverting input traces short. Avoid routing either input beneath switching-node copper or beside high-current motor and relay returns. If a sensor has high source impedance, minimize leakage through board contamination and input protection devices; otherwise input bias current can shift the effective threshold and produce offset much greater than the specified 7 mV maximum.
Ensure the selected supply remains within the 2 V to 36 V operating range under startup, load transients, and fault conditions. Validate input and output levels at minimum and maximum supply because comparator behavior can change across the range. The dual TSSOP package can dissipate power during output transitions, so copper around the device should provide thermal spreading even though no external heatsink is normally required.
Add filtering only where it does not compromise comparator response or the required threshold accuracy. A small series resistor at a high-impedance input can limit surge current, while an input capacitor can suppress noise but adds response delay. Check the resulting RC time constant against the switching speed required by the application. Use hysteresis for noisy or slowly changing signals to prevent repeated output toggling.
Compliance Information
RoHS3 compliance is stated by the PartGenie component record. No separate REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 qualification statement was established for the exact ordering code.