FIGURE 2 - TRIMMING TO VALUES
(Conceptual Illustration)
Mutual
inductance
reduction
due to change
in current
direction
Current path
before trimming
Foil shown in black, etched spaces in white
Interloop
capacitance
reduction
in series
Trimming process
removes this material
from shorting strip area
changing current path
and increasing
resistance
Current path after trimming
Note
To acquire a precision resistance value, the Bulk Metal Foil
chip is trimmed by selectively removing built-in “shorting bars.”
To increase the resistance in known increments, marked
areas are cut, producing progressively smaller increases in
resistance. This method reduces the effect of “hot spots” and
improves the long-term stability of VFR resistors.
TABLE 2 - SPECIFICATIONS
(1)
CHIP
SIZE
RATED
PO
WER (mW)
at + 70°C
WORKING
PO
WER (mW)
at + 200 °C*
RESISTANCE
RANGE
()
0603 120 33 100 to 4K
0805 300 83 10to 8K
1206 500 140 10to 25K
1506 600 167 10to 30K
2010 800 220 10 to 70K
2512 1200 330 10to 125K
Document Number: 63211 For any questions, contact www.vishayfoilresistors.com
Revision: 27-Oct-15 foil@vpgsensors.com 3
FRSH Series (Z1 Foil Technology)
0603, 0805, 1206, 1506, 2010, 2512
Note
*
Maximum working voltage for a given resistance value is calculated
using V =
.
TABLE 3 - DIMENSIONS AND LAND PATTERN in Inches (Millimeters)
Top View
D
T
W
L
Recommended Land Pattern*
Footprint
Z
G
X
Extended Pads
CHIP
SIZE
L
± 0.005 (0.13)
W
± 0.005 (0.13)
THICKNESS
MAXIMUM
D
± 0.005 (0.13)
Z G X
0603 0.063 (1.60) 0.032(0.81) 0.025 (0.64) 0.011 (0.28) 0.102 (2.59) 0.031 (0.78) 0.031 (0.78)
0805 0.080 (2.03) 0.050 (1.27) 0.025 (0.64) 0.015 (0.38) 0.122 (3.10) 0.028 (0.71) 0.050 (1.27)
1206 0.126 (3.20) 0.062 (1.57) 0.025 (0.64) 0.035 (0.89) 0.175 (4.45) 0.029 (0.74) 0.071 (1.80)
1506 0.150 (3.81) 0.062 (1.57) 0.025 (0.64) 0.047 (1.20) 0.199 (5.05) 0.029 (0.74) 0.071 (1.80)
2010 0.198 (5.03) 0.097 (2.46) 0.025 (0.64) 0.071 (1.82) 0.247 (6.27) 0.029 (0.74) 0.103 (2.62)
2512 0.249 (6.32) 0.127 (3.23) 0.025 (0.64) 0.095 (2.43) 0.291 (7.39) 0.029 (0.74) 0.127 (3.23)
*
For 0603 and 0805 land pattern dimensions are per IPC-782
TABLE 4 - FRSH PERFORMANCE LIMITS (MIL-PRF-55342)
TEST CONDITIONS
TYPICAL LIMIT %
(PPM)
MAX LIMIT %
(PPM)
(1)(2)
Short-Time Overload 6.25 x P
nom.
±0.005% (50) ±0.01% (100)
High Temperature Exposure +225°C, 2,000 h ±0.05% (500) ±1% (10,000)
Low Temperature Operation –65°C, 45 min at rated power ±0.005% (50) ±0.01% (100)
Moisture Resistance Per MIL-PRF-55342 (p. 4.8.9) ±0.01% (100) ±0.01% (100)
Stability under load, 200°C, 2,000 h Derated power (see table 2) ±0.05% (500) ±0.4% (4000)
Load-Life Test, 70°C, 2,000 h @ rated power (see table 2) ±0.005% (50) ±0.01% (100)
Thermal Shock 100 x (–65°C to + 200°C) ±0.02% (200) ±0.3% (3000)
Notes
(1)
Performances obtained with ceramic PCB.
(2)
As shown + 0.01 to allow for measurement errors at low values.
