78SR 2 Amp Series www.murata-ps.com 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators New 5.2V model FEATURES Murata’s 78SR-3.3/2 (3.3V, 2 Amp output) and 78SR-5/2 (5V, 2 Amp output) step-down, Up to 95% effi ciency–no costly heat sinks or fans switching regulators are ultra high-effi ciency, modern replacements for LM78xx series 1.5Amp linear regulators. They are pin- and size-compatible, drop-in replacements for required TO-220 style, 3-pin SIP or modular packages which require heat sinks. And, to ensure the 3.3V/2A & 5V/2A models; pin compatible with 1.5A 78xx lowest installed cost, no messy thermal grease, no mounting hardware and no external regulators components are required for full operation. Wide 8–32Vdc input voltage range A 200KHz switching frequency, combined with a synchronous rectifi er buck regulator Two package options: topology, provides for effi ciencies exceeding 95%. 78SR switchers can easily drive 2A loads from 12V or 24Vsupplies—at ambient temperatures up to +70°C—without heat sinks, 3-pin vertical mount SIP fans, or thermal derating. A thermally effi cient 3-pin vertical mount SIP occupies less than Low profi le, horizontal mount SIP 0.09in.2 (58mm2) of pc-board real estate, while a horizontal mount option has an installed No external Input/Output fi lter capacitors required height of less than 0.290in. (7.4mm). –40 to +70°C full load operation at 24Vin with no 78SR Series 2A switching regulators are lower cost, improved-effi ciency upgrades for derating many 78HT2, 78SR1, 78ST1, and PT5100 series switchers. Their higher effi ciency ensures Excellent load (±0.25%) and line (±0.35%) regulation signifi cantly lower heat generation and provides increased run time in battery-powered applications, making these regulators ideal for today’s low power “green” applications. Low-cost upgrade for 78HT2, 78SR1, 78ST1, and PT5100 switchers TECHNICAL NOTES Open frame design minimizes self-heating & pc-board 1. Input/Output (I/O) Filtering: As shown in the accompanying noise and ripple graphs, footprint 78SR Series regulators exhibit excellent low noise performance with no additional I/O Includes output short-circuit protection and thermal fi lter components. However, if additional noise reduction is required, be sure to use low shutdown ESR capacitors that are rated for continuous operation (with an additional 20% safety Low noise output for powering sensitive instrumentation margin) at the highest input voltage and ambient temperatures. Adding external output capacitors will improve the unit’s load-transient response. Ordering Information 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 Output Output Input Package Part No. electrolytic capacitor, connected as close as possible to the regulator’s +Vin and GND Voltage Current Voltage Type terminals (pins 1 and 2). An external input capacitor is particularly important if the input 78SR-3.3/2-C 3.3Vdc voltage is applied to the regulator via a mechanical switch or relay. Contact bounce at 78SR-5/2-C 5.0Vdc Vertical turn-on can produce large inductive current spikes, and these current spikes can gener- 78SR-5.2/2-C 5.25Vdc ate potentially damaging voltage transients at the regulator’s input terminals. 2.0A 8.0-32Vdc 78SRH-3.3/2-C 3.3Vdc 2. Input Fusing: 78SR switching regulators are not internally fused. If fusing their input 78SRH-5/2-C 5.0Vdc Horizontal and/or output terminals is required, use the data shown in the Effi ciency Curves as a guide to select an appropriate slow-blow fuse. 78SRH-5.2/2-C 5.25Vdc For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM_78SR-2A.C01 Page 1 of 6

78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators Performance/Functional Specifi cations TECHNICAL NOTES (continued) Typical at TA = +25°C & VIN = 12V, unless otherwise noted 3. Input-Output Isolation: 78SR regulators’ internal input and output circuits share a common connection (GND, pin 2), there is no Input/Output electrical isolation between their INPUT (pin 1) and OUTPUT (pin 3) Models 78SR-3.3/2-C 78SR-5/2-C 78SR-5.2/2-C terminals. Output Voltage 3.3Vdc 5.0Vdc 5.25Vdc 4. Overvoltage Protection: 78SR switching regulators do not provide Rated Output Current 2.0A 2.0A 2.0A input or output overvoltage protection. In the extremely rare situation Output Voltage Accuracy ±2% ±2% ±2% where a catastrophic failure occurs, the output voltage may rise to Input Voltage Range 8.0-32Vdc 8.0-32Vdc 8.0-32Vdc excessively high levels. If the load circuit must be protected against Line Regulation (100% load) ±0.35% ±0.35% ±0.35% all possible overvoltage situations, voltage-limiting circuitry must be Load Regulation (0-100% load) ±0.2% ±0.2% ±0.2% provided externally. Quiescent Current (mAdc) 25 typ., 30 max 20 typ., 35max 20 typ., 35max 5. Soldering & Handling Precautions: All units are designed to be Input Current vs. Input Voltage See Effi ciency Curves hand soldered to pc-boards, using lead-free no-clean solders Effi ciency See Effi ciency Curves (+260°C, 5 seconds max.). See the Mechanical Specifi cations sec- Transient Response See Performance Curves tion for pin 1 orientation and recommended pc-board hole dimen- Input & Output Noise See Performance Curves sions. Output Short Circuit Protection ➀ Continuous 78SR series regulators have limited built-in ESD protection; there- Input/Output Isolation None fore they should always be treated as ESD susceptible devices. Overvoltage Protection None 6. Horizontal-Pin Models (78SRH): 78SRH switching regulators are Undervoltage Protection None pin-compatible replacements for TO-220 style LM78xx linear regula- Environmental tors which are installed with their metal tabs or heat sinks laying fl at Models 78SR-3.3/2-C 78SR-5/2-C 78SR-5.2/2-C on the surface of the pc-board. In replacement applications, 78SRH Operating Temperature –40 to +70°C units must be soldered to the pc-board such that the insulating body Storage Temperature –40 to +85°C of diode D1 lies fl at and in contact with the pc-board’s surface. Cooling ➂ Free Air Convection Humidity (Non-condensing) 0 to 85% Physical Mechanical See Mechanical Specifi cations Package Open-frame SIP Pins 0.025" (0.64mm) square, tin-plated bronze Weight 0.15 ounces (4.2g) Pin Soldering +260°C for 5 seconds Absolute Maximum Ratings ➁ Input Voltage: +36Vdc Operating Temperature +85°C Output Current 3.0 Amps ➀ 78SR Series regulators can withstand a continuous short-circuit across their output terminals. However, extended short-circuit operation will decrease the unit’s long-term reliability. ➁ These are stress ratings only; Exposure of devices to any of these conditions may ad- versely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifi cations Table is not implied. ③ See derating chart for more information. www.murata-ps.com/support MPM_78SR-2A.C01 Page 2 of 6

78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Typical Performance Curves TA = +25°C, VIN as indicated Effi ciency, Synchronous Switching Regulators Noise and Ripple - 10% and 100% Load, 20 MHz Bandwidth 78SR-3.3/2 Vin = 12V, ILOAD = 0.2A 78SR-3.3/2 Vin = 12V, ILOAD = 2.0A 78SR-3.3/2 Vin = 24V, ILOAD = 2.0A 78SR-5/2 Vin = 12V, ILOAD = 0.2A 78SR-5/2 Vin = 12V, ILOAD = 2.0A 78SR-5/2 Vin = 24V, ILOAD = 2.0A Transient Response - 50% Load Step 78SR-3.3/2 25% to 75% Load Step 78SR-3.3/2 25% to 75% Load Step 78SR-3.3/2 75% to 25% Load Step Vin = 12V Vin = 24V Vin = 12V CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. 25% 75% 25% 75% 75% 25% 40μsec/div. 40μsec/div. 40μsec/div. 78SR-5/2 25% to 75% Load Step 78SR-5/2 25% to 75% Load Step 78SR-5/2 75% to 25% Load Step Vin = 12V Vin = 24V Vin = 12V CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH1: Vout, 50mV/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. CH2: Load Current 1A/div. 25% 75% 25% 75% 75% 25% 40μsec/div. 40μsec/div. 40μsec/div. www.murata-ps.com/support MPM_78SR-2A.C01 Page 3 of 6

78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators 78SR-3.3/2-C Input Current 78SR-5/2-C Input Current 1.0 1.4 2.0A LOAD 2.0A LOAD 1.2 0.8 MPS) MPS) 1.0 T CURRENT (A 00..46 1.0ALOAD UT CURRENT (A 00..68 1.0ALOAD PU NP 0.4 N I I 0.5A LOAD 0.2 0.2 0.5A LOAD 0.0 0.0 0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35 INPUT VOLTAGE INPUT VOLTAGE 78SR-3.3/2-C Effi ciency 78SR-5/2-C Effi ciency 100 100 95 95 90 90 %)85 %) 85 CY (80 Vin = 8V CY ( 80 Vin = 8V N N CIE75 Vin = 12V CIE 75 Vin = 12V EFFI70 Vin = 15V EFFI 70 Vin = 15V 65 Vin = 24V 65 Vin = 24V Vin = 28V Vin = 28V 60 60 Vin = 32V Vin = 32V 55 55 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 LOAD CURRENT (AMPS) LOAD CURRENT (AMPS) Thermal Derating Curve* 2.00 60ºC S) P 65ºC M1.75 A 70ºC T ( N E R R U C1.50 T U P T U O 1.25 8 12 15 24 28 32 36 INPUT VOLTAGE *Solid lines are for 3.3V and 5.0V models; dashed lines are for 5.2V models. www.murata-ps.com/support MPM_78SR-2A.C01 Page 4 of 6

78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators SHIPPING TRAYS AND BOXES 11.25” 10.50” REF REF 2.75 REF EACH FOAM TRAY CONTAINS 63 UNITS. IN FULL MPQ QUANTITIES, THREE TRAYS EQUAL TO A TOTAL OF 189 (3x63) UNITS PER BOX. www.murata-ps.com/support MPM_78SR-2A.C01 Page 5 of 6

78SR 2 Amp Series 2 Amp, 3.3V, 5.0V, & 5.2V Output, High Effi ciency, Synchronous Switching Regulators MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) Standard Package 0.16 0.80 (4.1) (20.3) D1 (cid:17)(cid:16)(cid:19) L1 L1 Pins: 0.025 (0.64) sq. 0.100 (2.54) 0.85 centers (21.6) PC-Board Hole: 0.037 - 0.043 (0.94 - 1.09) Dia. (cid:36)(cid:36)(cid:33)(cid:33)(cid:52)(cid:52)(cid:37)(cid:37)(cid:44)(cid:44)(cid:0)(cid:0)(cid:23)(cid:23)(cid:24)(cid:24)(cid:51)(cid:51)(cid:50)(cid:50)(cid:13)(cid:13)(cid:21)(cid:21)(cid:15)(cid:15)(cid:18)(cid:18)(cid:13)(cid:13)(cid:35)(cid:35) 0.095 1 2 3 (2.4) 0.15 (3.8) Min. 0.23 IN G O (5.7) P N U U D T T (+ PUT V)IN (+V O U )T Horizontal Package (H Pin Option) 0.07 (1.8) LL11 L1 1 2 3 0.30 (7.6) min. 0.280 D1 Pins: 0.025 (0.64) sq. (7.1) 0.100 (2.54) centers IN G O PU ND UT PC-Board Hole: T (+ PUT 0(0.0.9347 -- 10..0094)3 Dia. V)IN (+V O U )T This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2017 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_78SR-2A.C01 Page 6 of 6

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M urata: 78SR-3.3/2-C 78SR-5/2-C 78SRH-3.3/2-C 78SRH-5/2-C