REGULATOR SWITCH 3.3VDC 0.5A SIP

7803SR-C

Manufacturer Part Number7803SR-C
DescriptionREGULATOR SWITCH 3.3VDC 0.5A SIP
ManufacturerMurata Power Solutions Inc
Series78XX
TypePoint of Load (POL) Non-Isolated
7803SR-C datasheet
 


Specifications of 7803SR-C

Number Of Outputs1Output3.3V
Power (watts)1WMounting TypeThrough Hole
Voltage - Input7.5 ~ 36VPackage / Case3-SIP Module
1st Output3.3 VDC @ 500mASize / Dimension0.41" L x 0.42" W x 0.75" H (10.4mm x 10.7mm x 19.1mm)
Power (watts) - Rated1.7WOperating Temperature-40°C ~ 70°C
Output Power2 WInput Voltage Range7.5 V to 36 V
Output Voltage (channel 1)3.3 VOutput Current (channel 1)0.5 A
Output TypeSwitching RegulatorsProductNon-Isolated / POL
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names811-1115
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FEATURES
3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and
size-compatible with LM7805 & LM7812 regulators
Up to 95% effi ciency – no heat sinks or thermal
derating required
Two SIP-packages fi t existing TO-220 footprints:
- Vertical-pin models occupy less than 0.1 square in.
- Optional horizontal pins provide 0.350 in. installed
height
+7.5-36Vdc operating input range; Low 3mA
quiescent current
Built-in fi lter capacitors – no external components
required
–40 to +70°C operation at full load; Short-circuit
protection
Excellent load (±0.2%) and line (±0.3%) regulation
Ideal for powering instrumentation from
9V/12V/24V/28V supplies or batteries
Can be used with unregulated dc supplies
protection
Ordering Information
MPS Part No.
Output
Output
Voltage
Current
Standard Pin Package
7803SR-C
+3.3Vdc
0.5A
7805SR-C
+5.0Vdc
0.5A
7812SR-C
+12.0Vdc
0.4A
Horizontal Pin Package
7803SRH-C
+3.3Vdc
0.5A
7805SRH-C
+5.0Vdc
0.5A
7812SRH-C
+12.0Vdc
0.4A
 
For full details go to
www.murata-ps.com/rohs
Murata Power Solutions’ 7805SR-C (5V output), 7812SR-C (12V output) and 7803SR-C
(3.3V output) step-down switching regulators are modern drop-in replacements for older,
ineffi cient, LM7805 and LM7812 linear regulators. The 78XXSR's are pin- and size-compat-
ible with industry-standard TO-220 SIP packages. A 260kHz switching frequency provides
for effi ciencies as high as 95%. Full-load (up to 0.5A) operation from 9V, 12V, 24V, or 36V
supplies at ambient temperatures up to +70°C requires no heat sinks, no temperature
derating, no forced-air cooling, and no external capacitors.
78SR switching regulators provide many signifi cant improvements over their linear coun-
terparts: lower quiescent current (3mA vs. 5 mA), higher input voltage (40V vs. 32V), and
better output accuracy (±2% vs. ±5%). All these features combine to make 78SR regulators
ideal for new or existing LM7805 & LM7812 applications requiring full-load operation at
elevated voltages.
TECHNICAL NOTES
1.
Input/Output (I/O) Filtering: As shown in the noise and ripple graphs, 78SR switching
regulators exhibit excellent low-noise performance with no external I/O capacitors.
However, if additional noise reduction is required, be sure to use low-ESR capacitors
that are rated for continuous operation (with an additional 20% safety margin) at the
highest system voltages and temperatures. Adding external output capacitors will also
improve the unit’s load-transient response.
Applications in which 78SR regulators are located more than 24 inches (61cm) from
the input power supply should include an external 47uF/50V (or greater) aluminum
electrolytic capacitor, connected as close as possible to the regulator’s +Vin and
GND terminals (pins 1 and 2). An external input capacitor is particularly important if
the input voltage is applied to the regulator via a mechanical switch or relay. Contact
bounce at turn-on can produce large inductive current-spikes, and these current
spikes can generate damaging voltage transients at the regulator’s input terminals.
2.
Input Fusing: 78SR switching regulators are not internally fused. If fusing their input
and/or output terminals is required, use the data shown in the Effi ciency Curves as a
guide to selecting an appropriate slow-blow fuse.
3.
Input-Output Isolation: 78SR regulators’ internal input and output circuits share a
Input
Voltage
common connection (GND, pin 2); there is no electrical isolation between the INPUT
(pin 1) and OUTPUT (pin 3) terminals.
4.
Overvoltage Protection: 78SR switching regulators do not provide input or output
+7.5-36Vdc
overvoltage protection. In the extremely rare situation in which a catastrophic failure
+7.5-36Vdc
occurs, the output voltage may rise to excessively high levels. If your load must be
+15-36Vdc
protected against all possible overvoltage situations, external voltage-limiting circuitry
must be provided.
+7.5-36Vdc
5.
Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible if, for inputs
+7.5-36Vdc
+15-36Vdc
between 36 and 40Vdc, the maximum load current is reduced to 0.35A for 7805SR-C
and 7803SR-C, and to 0.3A for 7812SR-C. Under no circumstances should the input
voltage be allowed to exceed 45Vdc.
www.murata-ps.com/dpm
78xxSR Series
3.3V/5V/12V Outputs High-Effi ciency
Switching Regulators with LM78xx Pinouts
email: sales@murata-ps.com
05 Apr 2011 MDC_78xxSR Series.B06 Page 1 of 6

7803SR-C Summary of contents

  • Page 1

    ... Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible if, for inputs +7.5-36Vdc +15-36Vdc between 36 and 40Vdc, the maximum load current is reduced to 0.35A for 7805SR-C and 7803SR-C, and to 0.3A for 7812SR-C. Under no circumstances should the input voltage be allowed to exceed 45Vdc. www.murata-ps.com/dpm 78xxSR Series 3.3V/5V/12V Outputs High-Effi ...

  • Page 2

    ... Dropout Voltage: 78SR series regulators described in this data sheet specify a minimum input voltage at which full-load accuracy and output regulation are guaranteed (7.5V for 7803SR-C and 7805SR-C, and 15.0V for 7812SR-C). However, these devices will stay in regulation at lower input voltages if they are operated at less than their rated loads. ...

  • Page 3

    ... Typical Performance Curves T A Noise and Ripple - 10% and 100% Load, 20MHz Bandwidth Vin = 12V, I 7803SR-C = 50mA LOAD Vin = 12V, I 7803SR-C = 500mA LOAD = +25° indicated IN Vin = 12V, I 7805SR-C LOAD Vin = 12V, I 7805SR-C LOAD www.murata-ps.com/dpm 78xxSR Series 3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78xx Pinouts ...

  • Page 4

    ... Load Step 7803SR-C 100% to 10% Load Step Transient Response - 90% Load Step 7805SR-C 10% to 100% Load Step 7805SR-C 100% to 10% Load Step www.murata-ps.com/dpm 78xxSR Series 3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78xx Pinouts 7812SR-C 10% to 100% Load Step ...

  • Page 5

    ... LOAD 0.30 0.25 50% LOAD 0.20 0.15 0.10 0.05 0. www.murata-ps.com/dpm 78xxSR Series 3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78xx Pinouts 7803SR-C Input Current 100% LOAD 50% LOAD 25% LOAD INPUT VOLTAGE 7805SR-C Input Current 100% LOAD 50% LOAD 25% LOAD 8 10 ...

  • Page 6

    MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES DEC ±0.02 (±0.51 DEC ±0.010 (±0.254) 0.19 (4.8) L1 low-profi le package 0.37 (9.3) max. 0.15 (3.8) min. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO ...