78SR ETC [List of Unclassifed Manufacturers], 78SR Datasheet

78SR

Manufacturer Part Number

78SR

Description

3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78XX Pinouts

Manufacturer

ETC [List of Unclassifed Manufacturers]

Datasheet

1.78SR.pdf (5 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78SR-5/2-C

Manufacturer:

SILICON

Quantity:

101

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78SR105HC

Manufacturer:

XILINX

Quantity:

593

Company:

Meier Automation Equipment Co., Limited

Part Number:

78SR105HC

Manufacturer:

TI/德州仪器

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78SR105SC

Manufacturer:

XILINX

Quantity:

101

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78SR105VC

Manufacturer:

Quantity:

410

Company:

Meier Automation Equipment Co., Limited

Part Number:

78SR106HC

Manufacturer:

POWERTRENDS

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

78SR112HC

Manufacturer:

ZENIC

Quantity:

101

Company:

H&T Electronics

Part Number:

78SR174HC

Quantity:

600

Company:

H&T Electronics

Part Number:

78SR174HC

Quantity:

600

Current page: 1 of 5
Download datasheet (369Kb)

NEW

Features

Order online at www.datel.com

• 3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and size-compatible

• Up to 95% efﬁ ciency – no heat sinks or thermal derating required!

• Two SIP-packages ﬁ t existing TO-220 footprints:

• +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

• Can be used with unregulated dc supplies

Technical Notes

1. Input/Output (I/O) Filtering: As shown in the noise and ripple graphs,

2. Input Fusing: 78SR switching regulators are not internally fused. If

3. Input-Output Isolation: 78SR regulators’ internal input and output

DATEL, Inc., Mansﬁ eld, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: sales@datel.com • Internet: www.datel.com

with LM7805 & LM7812 regulators

supplies or batteries

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 continu-

ous 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.

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.

circuits share a common connection (GND, pin 2); there is no electrical

isolation between the INPUT (pin 1) and OUTPUT (pin 3) terminals.

low-proﬁ le package

Vertical-pin models occupy less than 0.1 square in.

Optional horizontal pins provide 0.350 in. installed height

4. Overvoltage Protection: 78SR switching regulators do not provide

5. Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible

6. Soldering & Handling Precautions: All units are designed to be

7. Horizontal-Pin Models (78XXSRH): 78XXSRH switching regulators

7803SR (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-

compatible 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.

improvements over their linear counterparts: lower quiescent

current (3mA vs. 5 mA), higher input voltage (40V vs. 32V),

and better output accuracy (±1.5% 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.

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 protected against

all possible overvoltage situations, external voltage-limiting circuitry

must be provided.

if, for inputs between 36 and 40Vdc, the maximum load current is

reduced to 0.35A for 7805SR and 7803SR, and to 0.3A for 7812SR.

Under no circumstances should the input voltage be allowed to

exceed 45Vdc.

hand soldered to pc-boards using no-clean solders (+260°C, 5 sec-

onds max.). Water-soluble solders can also be used, but the units

must be washed and dried using processes appropriate to the type of

solder employed. See the Mechanical Speciﬁ cations section for pin 1

orientation and recommended plated-through hole dimensions.

While 78SR regulators easily withstand a 2kV ESD discharge to any

terminal (using human body model), they should always be treated as

ESD sensitive devices.

are pin-compatible replacements for TO-220 style LM78XX linear reg-

ulators that are installed with their metal tabs lying ﬂ at on the surface

DATEL’s 7805SR (5V output), 7812SR (12V output) and

78SR switching regulators provide many signiﬁ cant

Regulators with LM78XX Pinouts

A SUBSIDIARY OF C&D TECHNOLOGIES

High-Efﬁ ciency Switching

78SR Series

3.3V/5V/12V Outputs

Related parts for 78SR

78SR Summary of contents

Page 1

... See the Mechanical Speciﬁ cations section for pin 1 orientation and recommended plated-through hole dimensions. While 78SR regulators easily withstand a 2kV ESD discharge to any terminal (using human body model), they should always be treated as ESD sensitive devices. ...

Page 2

... L1 and all exposed pc-board traces. 8. 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 and 7805SR, and 15.0V for 7812SR) ...

Page 3

... Vin = 12V 500mA LOAD Transient Response - 90% Load Step 7805SR 10% to 100% Load Step Vin = 9V 7805SR 100% to 10% Load Step Vin = 9V 3 78SR Series 7812SR Vin = 24V 40mA LOAD 7812SR Vin = 24V 400mA LOAD 7812SR 10% to 100% Load Step Vin = 18V ...

Page 4

... Series 7803SR Efﬁ ciency 25% LOAD INPUT VOLTAGE 7805SR Efﬁ ciency 25% LOAD INPUT VOLTAGE 7812SR Efﬁ ciency 100 25% LOAD ...

Page 5

... DATEL GmbH München, Germany Tel: 89-544334-0 Internet: www.datel-europe.com E-mail: datel.gmbh@datel.com Fax: (508) 339-6356 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025 Internet: www.datel-co.jp E-mail: salestko@datel.co.jp, salesosa@datel.co.jp DATEL China Shanghai, China Tel: 011-86-51317131 E-mail: davidx@datel.com DS-0540D 11/04 78SR Series 0.19 (4. Pins: 0.025 (0.64) sq. 0.100 (2.54) PC-Board Hole: 0.037 - 0.043 ...

Related keywords

78SR datasheet
78SR data sheet
78SR pdf datasheet
78SR component
78SR part
78SR distributor
78SR RoHS
78SR datasheet download