4A12P 1AH 12R5

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oH
VE S CO
AV R M
AI SIO PL
LA N IA
BL S NT
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Features
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RoHS compliant* versions available
Overcurrent/lightning protection to TELCORDIA GR-1089 Issue 3
Typical application is secondary protection on telecom line cards
UL497A recognition
Thermal fuse links
Must be used in conjunction with a solid state primary protector, or a GDT primary protector
4A12P-1AH-12R5 - Surge Line Protection Module
Electrical Characteristics
Resistance Value ................................................................12.5 ohms
Resistance Tolerance ..................................................................±5 %
TCR ..................................................................................100 ppm/°C
Ratio Tolerance ........................................................................±0.5 %
Temperature Range...................................................-40 ºC to +85 ºC
Physical Characteristics
Body Style ...........................................Dual In Line SMD - Twin Pack
Substrate Material ........................................................96 % Alumina
Lead Frame Material........................................Copper, solder coated
Flammability .....................................................Conforms to UL94V-0
Processability................Unit is only suitable for no-clean processing
Convection Reflow...................Unit will withstand 260 °, 20 seconds
Packaging............16 inch diameter reels, 44 mm tape, 250 pcs./reel
Functional Characteristics @ 25 °C (per Telcordia GR-1089 Issue 3)
First Level Lightning Surge Resistors will remain within tolerance after testing.
1000 Volts Peak, 100 Amp Peak Current,
Max. Rise/Min. Decay Time 10x1000 µs,
60 Seconds Between Pulses:
Number of Pulses ..............................25 each resistor each polarity
2500 Volts Peak, 500 Amp Peak Current,
Max. Rise/Min. Decay Time 2x10 µs,
60 Seconds Between Pulses:
Number of Pulses .............................10 simultaneous each polarity
Functional Characteristics @ 25 °C (Continued)
Second Level Lightning Surge Resistor package must fail safely causing no fire, electrical, or
framentation hazard.
5000 Volts Peak, 500 Amp Peak Current,
Max. Rise/Min. Decay Time 2x10 µs:
Number of Pulses ...............................1 simultaneous each polarity
Second Level AC Power Fault Resistor package must fail safely causing no fire, electrical, or
framentation hazard. Device will fail prior to Bussman MDQ 1-6/10 A
fuse in series.
100 Vrms, 2.2 Amp Short Circuit Current:
Duration...........................................................................15 minutes
600 Vrms, 7 Amp Short Circuit Current:
Duration............................................................................5 seconds
250 Vrms, 25 Amp Short Circuit Current:
Duration...........................................................................15 minutes
600 Vrms, 60 Amp Short Circuit Current:
Duration............................................................................5 seconds
Product Dimensions
TOP VIEW
40.64 ± .25
(1.600 ± .010)
Meets Protection Coordination as defined in Telcordia Section
4.6.7.1, Condition A.
24
22
19 18
15
13
1
3
6
10
12
First Level AC Power Fault Resistors will remain within tolerance after testing.
50 Vrms, 0.33 Amp Short Circuit Current:
Duration...........................................................................15 minutes
100 Vrms, 0.17 Amp Short Circuit Current:
Duration...........................................................................15 minutes
600 Vrms, 1.00 Amp Short Circuit Current:
Duration.........................................................Sixty 1-second pulses
440 Vrms, 2.2 Amp Short Circuit Current:
Duration .........................................................Five 2-second pulses,
cooling to ambient between pulses
7
FRONT VIEW
14.10 ± .25
(0.555 ± .010
12.70 ± .13
(0.500 ± .005)
0.25
(0.010)
7.62 ± .13
(0.300 ± 0.005)
6.2 ± .25
(0.244 ± 0.010)
5.08 ± .13
(0.200 ± 0.005)
600 Vrms, 3.00 Amp Short Circuit Current:
Duration ......................................................Five 1.1-second pulses,
cooling to ambient between pulses
0.5
(0.020)
BOTTOM VIEW
1
3
6
7
10
12
24
22
19 18
15
13
DIMENSIONS:
*RoHS Directive 2002/95/EC Jan 27, 2003 including Annex.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
SIDE VIEW
5.28 ± .013
(0.208 ± .005)
MM
(INCHES)
1.68
(0.066)
2.31 ± .25
(0.091 ± .010)
2.49 ± .25
(0.098 ± .010)
7.11 ± .25
(0.280 ± .010)
4A12P-1AH-12R5 - Surge Line Protection Module
How To Order
Electrical Schematic
4A 12 P - 1AH - 12R5 LF
Model
(4A = Surface Mount)
F3
F4
R3A
Number of Pins
24
R4A
22
19
18
15
13
Physical Configuration
Electrical Configuration
1AH = Custom
R3B
Resistance Code
12R5 = 12.5 Ohms
RoHS Compliant Option
Blank = Standard Product
LF = RoHS Compliant Product
R1B
3
1
SUB B
R4B
6
7
R2B
10
F1
12
F2
R1A
NOTES:
R1A + R1B + F1 = 12.5 OHMS ±5 %.
R2A + R2B + F2 = 12.5 OHMS ±5 %.
RATIO MATCH: R1 / R2 = 1 ± 2.5 %.
CO-PLANARITY = 0.004 INCHES.
R2A
SUB A
R3A + R3B = 12.5 OHMS ±5 %.
R4A + R4B = 12.5 OHMS ±5 %.
RATIO MATCH: R3 / R4 = 1 ± 2.5 %.
Asia-Pacific: TEL +886- (0)2 25624117 • FAX +886- (0)2 25624116
Europe: TEL +41-41 7685555 • FAX +41-41 7685510
The Americas: TEL +1-951 781-5500 • FAX +1-951 781-5700
www.bourns.com
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
4A12P-1AH-12R5 - Surge Line Protection Module
Telcordia GR-1080-CORE Protection Coordination
Protection coordination (Telcordia Technologies Generic Requirements, GR-1089-CORE, Issue 3, October 2002, section 4.6.7.1
protection coordination, page 4-15) is a new test for GR-1089-CORE issue 3 that will be a requirement on January 1, 2006. The equipment using the 4A12P-1AH-12R5 overcurrent line feed resistor (LFR) must be used with either a solid state primary or a primary GDT
(5-pin gas discharge tube) such as the Bourns® 2024-31-MSP Protector.
The equipment communication lines will initially be tested at the specified primary voltage protector type using a 10/1000 µs generator.
A solid state primary will start testing at 400 V where a GDT primary will start at 600 V. If condition A or B defined below is not
achieved, the 10/1000 generator voltage, VG is increased (in steps of 200 V or interpolated value) to a maximum of 2000 V or until one
of the two following criteria is achieved:
A. The communication lines are stressed to 600 V peak (VP) across the equipment terminals with the GDT specified as a primary.
VP specification is reduced to 400 A for a solid state primary.
Note: Series resistance of the primary protector such as a heat coil resistance is connected between the generator and equipment.
This resistance will be effectively added to RSERIES value when calculating the generator open circuit test voltage.
B. The peak current (IPP) into the equipment terminals exceeds 100 A.
The coordination test requires ten repetitions per polarity. The communication lines will also be tested to metallic and longitudinal
procedures to ensure conformance. The equipment fails the coordination requirement if neither A or B is achieved with a maximum
generator voltage of 2000 V or the equipment is damaged and does not operate as intended. Figure 1 shows the setup and
measurement points for the coordination test.
Generator
Equipment
IP
RG
VVG
R SERIES
For example, a GDT is defined as the primary protector. The voltage, VP
will be 600 V and the current through RSERIES (4A12P-1AH-12R5) will
be 48 A (600/12.5). With a generator fictive resistance of 10 Ω,
the generator VG should be adjusted to 1080 V to achieve voltage
coordination. The resistance of the 4A12P-1AH-12R5 ensures the
equipment will voltage coordinate before 100A is achieved.
VP
Thyristor
Note: Tolerances of the impulse generator, LFR, measurement, etc. will
provide a variation on the actual impulse generator setting.
Figure 1 — Coordination Requirements
Overvoltage Thyristor Selection
The resistance tolerance of the LFR is ±5 % and therefore the expected maximum current from the generator will be 51 A. To ensure
reliable operation of the overvoltage protector, the thyristor should be specified to a 10/1000 µs of at least 51 A.
ProSLIC® is a registered trademark of Silicon Laboratories.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
REV. 06/11
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