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| 型号： | 7803SR-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 1/6页 |
| 文件大小： | 0K |
| 描述： | REGULATOR SWITCH 3.3VDC 0.5A SIP |
| 标准包装： | 100 |
| 系列： | 78XX |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 7.5V |
| 电压 - 输入（最大）： | 36V |
| Voltage - Output 1： | 3.3V |
| 电流 - 输出（最大）： | 500mA |
| 电源（瓦） - 制造商系列： | 1W |
| 电压 - 隔离： | * |
| 特点： | * |
| 安装类型： | 通孔 |
| 封装/外壳： | 3-SIP 模块 |
| 尺寸/尺寸： | 0.41" L x 0.42" W x 0.75" H（10.4mm x 10.7mm x 19.1mm） |
| 工作温度： | -40°C ~ 70°C |
| 电源（瓦特）- 最大： | 1.7W |
| 产品目录页面： | 2856 (CN2011-ZH PDF) |
| 其它名称： | 811-1115 |
www.murata-ps.com
FEATURES
? 3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and
size-compatible with LM7805 & LM7812 regulators
? Up to 95% ef?ciency – no heat sinks or thermal
derating required
? Two SIP-packages ?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 ?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
78xxSR Series
3.3V/5V/12V Outputs High-Ef?ciency
Switching Regulators with LM78xx Pinouts
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,
inef?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 ef?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 signi?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 Ef?ciency Curves as a
guide to selecting an appropriate slow-blow fuse.
MPS Part No.
Standard Pin Package
7803SR-C
7805SR-C
7812SR-C
Output
Voltage
+3.3Vdc
+5.0Vdc
+12.0Vdc
Output
Current
0.5A
0.5A
0.4A
Input
Voltage
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
3. Input-Output Isolation: 78SR regulators’ internal input and output circuits share a
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
overvoltage protection. In the extremely rare situation in which a catastrophic failure
occurs, the output voltage may rise to excessively high levels. If your load must be
Horizontal Pin Package
protected against all possible overvoltage situations, external voltage-limiting circuitry
7803SRH-C
7805SRH-C
7812SRH-C
+3.3Vdc
+5.0Vdc
+12.0Vdc
0.5A
0.5A
0.4A
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
must be provided.
5. Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible if, for inputs
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.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/dpm
05 Apr 2011
email: sales@murata-ps.com
MDC_78xxSR Series.B06 Page 1 of 6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7803SRH | 制造商:Murata Power Solutions 功能描述:DATEL - Bulk 制造商:Murata Power Solutions 功能描述:DC/DC Power Supply Single-OUT 3.3V 0.5A 3-Pin SIP |
| 7803SRH-C | 功能描述:DC/DC转换器 SW0.5A 7.5V-36Vto3.3V RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| 7804 | 功能描述:端子 HORIZ .250X.032 HDRS RoHS:否 制造商:AVX 产品:Junction Box - Wire to Wire 系列:9826 线规:26-18 接线柱/接头大小: 绝缘: 颜色:Red 型式:Female 触点电镀:Tin over Nickel 触点材料:Beryllium Copper, Phosphor Bronze 端接类型:Crimp |
| 7804 | 制造商:Keystone Electronics Corp 功能描述:Connector Number of Contacts:4 |
| 78-040 | 功能描述:C-CL XHD 4-5/8 STD SCR 制造商:apex tool group 系列:* 零件状态:在售 标准包装:1 |
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