R&D comparator LM393

high-precision

Overview
The LM393 is a dual voltage comparator (B-version LM393B / LM2903B available) comprising two independent comparators designed for single‑supply operation over a wide voltage range. B‑version devices provide improved offset, lower input bias and supply currents, reduced propagation delay and enhanced ESD robustness (2 kV HBM) via dedicated clamps. Quiescent current is largely independent of supply voltage.

Key features

• Dual voltage comparator (LM393 family); B‑version improvements also offered (LM393B, LM2903B)
• B‑version highlights:
  • Maximum rating up to 38 V
  • ESD rating (HBM): 2 kV
  • Low input offset (typical down to 0.37 mV)
  • Low input bias current (typical ~3.5 nA)
  • Low supply current (around 200 µA per comparator for B‑version)
  • Faster response time (≈1 µs in B‑version)
  • Available in tiny 2 x 2 mm WSON package (select devices)
• Drop‑in replacement for LM293, LM393 and LM2903 (A and V grades)
• Common‑mode input range includes ground; differential input range up to ±38 V (depending on variant)
• Open‑collector / open‑drain outputs compatible with TTL, MOS and CMOS logic

Technical parameters
Number of channels: 2
Output type: Open‑collector / Open‑drain
Propagation delay (typ): 1.3 µs (B‑version noted ≈1 µs)
Supply voltage range: 2 V (min) – 36 V (typ max); B‑version may be rated to 38 V
Quiescent current per comparator (typ): 0.225 mA (table) / ~200 µA noted for B‑version
Input offset (Vos) at 25°C (max): 5 mV (B‑version can be lower ~0.37 mV)
Input bias current (max): 50 nA (B‑version typical ~3.5 nA)
VICR (input common‑mode) min–max: 0 V – 34.5 V
Operating temperature (commercial): 0 °C to 70 °C
ESD (HBM): 2 kV (B‑version)

Package options
PDIP (P) | 8 pins | area ~92.51 mm² (9.81 x 9.43 mm)
SOIC (D) | 8 pins | area ~29.4 mm² (4.9 x 6 mm)
SOP (PS) | 8 pins | area ~48.36 mm² (6.2 x 7.8 mm)
TSSOP (PW) | 8 pins | area ~19.2 mm² (3 x 6.4 mm)
VSSOP (DGK) | 8 pins | area ~14.7 mm² (3 x 4.9 mm)
WSON (select) | tiny 2 x 2 mm package (select devices)

Applications and notes

• Threshold detection, level shifting and general‑purpose voltage comparison in industrial and electronic systems
• Suitable where low supply current and single‑supply operation are required
• Verify B‑version datasheet for improved parameters and extended ratings before substitution