Nichrome Resistor Networks
on Ceramic Substrates
Model 688 Series
Precision Thin Film .300” Dual In-Line
Surface Mount Resistor Networks
•
RoHS Compliant
•
Unique passivation coating eliminates moisture
concerns and allows for use in applications
traditionally restricted to tantalum nitride
•
Outperforms other thin film resistor materials providing
excellent tolerances, ratio matching,
temperature coefficient, and temperature tracking
•
Improved performance over silicon substrates in stray
capacitance, frequency response and stability
OBSOLETE
Not Recommended for New Designs
Electrical
Operating Temperature Range
Resistance Voltco
Interlead Capacitance
Operating Voltage, Maximum
Insulation Resistance
Noise, Maximum (MIL-STD-202, Method 308)
-55°C to +125°C
≈0
<2pF
100Vdc or
√PR
≥10,000
Megohms
-40dB
Environmental (Mil-R-83401)
Thermal Shock plus Power Conditioning
Short Time Overload
Terminal Strength
Moisture Resistance
Mechanical Shock
Vibration
Low Temperature Storage
High Temperature Exposure
Load Life, 1,000 Hours
Resistance to Solder Heat
Dielectric Withstanding Voltage
Temperature Exposure, Maximum
Marking Permanency
Lead Solderability
Flammability
Storage Temperature Range
Specifications subject to change without notice.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
R 0.25%
R 0.10%
R 0.10%
R 0.20%
R 0.25%
R 0.25%
R 0.10%
R 0.10%
R 0.10%
R 0.10%
100V for 1 minute
215°C for 3 minutes
MIL-STD-202, Method 215
MIL-STD-202, Method 208
UL-94V-O Rated
-65°C to +125°C
© TT electronics plc
10.13
Nichrome Resistor Networks
on Ceramic Substrates
Model 688 Series
OBSOLETE
100% matte Tin (RoHS)
Gull Wing
0.004” (0.102mm)
Alumina
Nichrome
Molded Epoxy
Mechanical
Lead Material
Lead Configuration
Lead Coplanarity
Substrate Material
Resistor Material
Body Material
Tolerances
Accuracy Code
Absolute Resistance Tolerances, at 25°C
Ratio
Temperature Coefficient of Resistance
Temperature Coefficient of Resistance, Tracking
B
0.1%
0.1%
D
0.5%
0.1%
±25ppm/°C
±5ppm/°C
F
1.0%
0.5%
Standard Resistance Values, Ohms
Model
688A
688B
Ohms
50K
100K
100K
Code
5002
1003
1003
Power Derating Curve
100
80
60
40
20
0
-0
70
125 150
Degrees C
Percent of
Rated Power
Power Dissipation, Watts At 70°C
Model
688
Package
.7
Per Resistor
.1
Solder Pad Layout (Inch/mm)
.080
2.03
.050 Typ.
1.27
.025
0.64
.300
7.62
.460
11.7
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
10.13
Nichrome Resistor Networks
on Ceramic Substrates
Model 688 Series
OBSOLETE
Outline Dimensions (Inch/mm)
.0165
±
.0025
Typ.
0.419
±
0.064
.050 Typ.
1.27
16
9
.032
±
.008
0.81
±
0.20
+.003
.010 –.001 Typ.
0.25 +0.08
–0.02
.300
Max.
7.62
.405
±
.005
10.3
±
0.13
0˚ To 8˚
1
.413 Max.
10.5
8
.104 Max.
2.64
.0085
±
.0035
0.216
±
0.089
Seating
Plane
Note: Leads are within .005/0.13 of true position. Maximum allowable mold excursion = 0.006”
Schematics
688A - Isolated Resistors
16
16
688B - Bussed Resistors
1
1
Applicable Documents
MIL-R-83401 — Resistor Networks, Fixed, Film, General Specifications
MIL-STD-202 — Test Methods for Electronics and Electrical Component Parts
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
10.13
Nichrome Resistor Networks
on Ceramic Substrates
Model 688 Series
OBSOLETE
Typical Marking
FRONT
Circuit Type
688-A
5002
YY MM
Date Code
1234
Lot Number
Resistance Code
Packaging
Standard:
Magazine:
Option
Option:
Reel:
Embossed Tape & Reel
Magazines
Conforms to EIA and JEDEC standards.
All units oriented with lead #1 to the same side.
Diameter = 7” Reel
Capacity = 500 Units
13” Reel
1,500 Units
Magazines
All units oriented with lead #1 to the same side.
Capacity = 50 units
Ordering Information
68 8 A
Model
Number of Leads:
8 = 16 Leads
Circuit Type:
A = Isolated
B = Bussed
5002 B
LF 7
Packaging Option:
7 = 7” Reel Diameter
13 = 13” Reel Diameter
(No code used for Magazines.)
Lead Finish:
LF=Lead Free (RoHS)
Accuracy Code
Resistance Code:
First 3 digits are significant.
Last digit denotes the number of trailing zeros.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
10.13
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