TNPW04021K00BEED

Vishay 1kΩ, ±0.1%, ±25 ppm/K thin-film resistor in 0402 (1005 metric). Terminals 1 and 2 are nonpolar. Exact value, tolerance, TCR and packaging suffix belong to the identity, even when the body looks identical to another resistor.

B denotes 0.1%, E denotes 25 ppm/K, and ED specifies 10,000-piece paper tape packaging. This is the lead-free TNPW e3 family, not the separate lead-bearing TNPW family. The current manufacturer document distinguishes general, power and advanced operating modes; 0.13 W is the advanced-mode P70 value, not a universal rating under all stability conditions. General-mode P70 is 0.070 W. Body dimensions are 1.00 ±0.05 ×0.50 ±0.05 ×0.35 ±0.05 mm, with nominal 0.20 mm end terminations.

Vishay document 28950 offers separate IPC and IEC reflow examples. This candidate uses its IPC example: 0.55 ×0.60 mm pads, centers ±0.475 mm, gap 0.40 mm and outer span 1.50 mm. The IEC example is different. Existing board 0.54 ×0.64 mm pads and centers ±0.51 mm are a separate variant. Do not silently substitute patterns. Solder-mask, paste, assembly and fabrication qualification remain open; the physical PCB has not been changed.

The included generic KiCad model measures 1.00 ×0.50 ×0.35 mm. Its envelope fits the nominal package; it is not exact manufacturer CAD, terminal metallization, film structure or a tolerance envelope. It carries no value marking, so do not infer resistance from its appearance. STEP uses mm; GLB meters; Z up and seating at zero. The annotated hero is reference artwork, not assembly geometry.

Manufacturer datasheet · Land-pattern guide

The component remains provisional. Precision resistor selection does not alone establish system accuracy: include ratio tolerance, differential temperature drift, self-heating, amplifier/reference errors and calibration in the circuit budget.