Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Features • Fully qualified to Class H or K • Passive components used for maximum tolerance in space environments • -55°C to +125°C operation • Nominal 28 V input, 0 V to 50 V operation • Up to 0.8 A throughput current • 55 dB attenuation typical at 500KHz • Compliant to MIL-STD-461C CE-03 • Compatible with MIL-STD-704 A-E 28 VDC power bus Input Voltage and Current Input (V) 28 DESCRIPTION The STF28-461™ EMI filter module has been designed as a companion for Interpoint SMSA flyback power converters. Multiple SMSA power converters can be operated from a single filter provided the total power line current does not exceed the filter maximum rating. The STF filter will reduce the SMSA’s power line reflected ripple current to within the limit of MIL-STD461C, Method CE03. The STF filter is fabricated using thick film hybrid technology and is sealed in a metal package for space, military, aerospace and other applications requiring EMI suppression. Operation The SMSA power converter has an internal 2 µF ceramic capacitor across its input power terminals. When the SMSA and STF filters are used together, this capacitor becomes part of the filter and forms its final LC output section. The STF filter provides both differential and common mode rejection bringing DC/DC converters into compliance with MIL-STD-461C CE03. It is designed to be used with the SMSA, SMHF, and SLH Series of converters. The STF filter can be used with multiple converters up to the rated current of the filter. For more information, contact your Interpoint representative. Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 • Redmond WA 98073-9705 425.882.3100 • [email protected] www.craneae.com Current (A) 0.8 For SMHF and SLH converters a 4 µF (or greater) ceramic cap is needed between the filter and converter to complete the last inductive stage of this STF filter. This will ensure unconditional stability when used with the SMHF or SLH. The SMSA does not require this. Optional Damping Circuit The optional damping circuit (Figure 2) can be used to prevent filter overshoot caused by MIL-STD-704A 80 V, or other, transients having rise times of less than 200 µSec. This damping can be alternately provided with a 1.50 V resistor in series with the filter positive input where the additional line loss can be tolerated. For transients with rise times of greater than 200 µSec, there is no overshoot and the damping circuit is not required. Screening The STF28-461 filter offers three screening options: Space Prototype (O), Class H, or Class K. Radiation tolerant to Radiation Hardness Assurance (RHA) levels of “-” (O) or “H”, per MIL-STD-38534. Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA”. See “Class H and K, MIL-PRF-38534 Screening” tables, for descriptions. Page of 10 Rev A - 20070509 Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Operating Conditions and characteristics Input Voltage Range •0 to 50 VDC continuous Lead Soldering Temperature (10 sec per lead) •300°C Storage Temperature Range (Case) •-65°C to +150°C Case Operating Temperature (Tc) •-55°C to +125°C full power Derating Input/Output Current •Derate linearly from 100% at 125°C to 0% at 135°C case. Capacitance •0.045 µF max, any pin to case Isolation •100 megohm minimum at 500 VDC •Any pin to case, except case pin 0.65 � Positive Input 20 � 20 � Input Common >285 �H mechanical and environmental Size (maximum) 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm) See case A1 for dimensions. Weight (maximum) 10.3 grams typical, 11.5 grams maximum Screening Space Prototype (O), Class H, or Class K Radiation tolerant to Radiation Hardness Assurance (RHA) levels of “-” (O) or “H”, per MIL-STD-38534. Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF- 38534, which is defined as “no RHA”. See “Class H and K, MIL-PRF-38534 Screening” tables for more information. Available configurations: OO, HH, KH 6 �H 6 �H 6800 pF 500 V x2 6800 pF / 500 V 2 �F 2 �F x2 6800 pF / 500 V 6800 pF 500 V STF28-461 The case ground connection between the filter and the converter should be as low an impe ance as possible to minimize EMI. Direct contact of baseplate to chassis ground provides the Figure 1: Schematic – Typical Values STF28-461 Positive Input DC/DC Converter Positive Output C Case Ground Input Common R Output Common The RC output is an optional damping circuit. It is recommended in applications where 80 volt line transients may occur with rise times <50 �S. C = 6 �F Ceramic R = 2.2 Ω, 5%, 1/4 W, Carbon comp. Positive Input Case Ground Input Common RL Output Common Multiple units allowed up to rated output current. Figure 2: Damping Circuit www.craneae.com Positive Output Page of 10 Rev A - 20070509 RL Positive Output Output Common Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP PIN OUT Pin 1 2, 3 4 5, 6 7 8 Designation Positive Input Positive Output Case Ground Output Common Input Common Case Ground Squared corner and dot on top of cover indicate pin one. 1 BOTTOM 8 VIEW STF 7 2 3 4 6 5 See case A1 for dimensions. Figure 3: Pin Out www.craneae.com Page of 10 Rev A - 20070509 Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP model numbering key Base Model STF28 - 461 / dscc number KH MIL-STD-461 Reference Screening DSCC Drawing (5915) STF28-461 Filter Similar Part 96003H02hxA 96003H02HXC 96003H02KXA 96003H02KXC STF28-461/HH STF28-461/HH STF28-461/KH STF28-461/KH For exact specifications for a DSCC product, refer to the DSCC drawing. SMDs can be downloaded from: http://www.dscc.dla.mil/programs/smcr Model Selection STF28- Base model 461 MIL-STD-461 compliant / screening Choose one from each of the following rows Screening OO* - Space prototype, HH, KH *Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA” www.craneae.com Page of 10 Rev A - 20070509 Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified. sTF28-461 PARAMETER CONDITIONS MIN INPUT VOLTAGE CONTINUOUS 0 28 — — INPUT CURRENT1 NOISE REJECTION DC RESISTANCE (RDC) 50 0.80 50 — — 1 MHz 50 — — 5 MHz 45 — — TC = 25°C — STEADY STATE OUTPUT CURRENT STEADY STATE — 1.2 VOUT = VIN - IIN(RDC) — — 0.80 — Notes: 1. Guaranteed by design, not tested. www.craneae.com MAX 500 kHz OUTPUT VOLTAGE POWER DISSIPATION AT MAXIMUM CURRENT TYP Page of 10 Rev A - 20070509 — 1.15 UNITS VDC A dB V VDC A W Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Typical Performance Curves: 25°C Tc, nominal Vin, unless otherwise specified. 90 EMISSION LEVEL (dB A) 80 CE 70 NARROWBAND 03 60 LI M IT 50 40 30 20 10 0 .015 0.1 1 FREQUENCY (MHz) 10 50 MSA2805S converter without a filter. Figure 4 90 EMISSION LEVEL (dB A) 80 70 60 CE 03 NARROWBAND LI M IT 50 40 30 20 10 0 .015 0.1 1 FREQUENCY (MHz) 10 50 MSA2805S converter at full load with an STF28-461 EMI filter. Figure 5 MAGNITUDE OF Zo (Ohms) 10.0 3.2 1.0 0.32 0.10 1K 2 µF external capacitor on filter output 10K 100K FREQUENCY (Hz) Typical output impedance (Z) with input shorted. STF28-461 EMI filter. Figure 6 www.craneae.com Page of 10 Rev A - 20070509 1M Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filter Cases 28 Volt input – 0.8 AMP BOTTOM VIEW CASE A1 Projection Weld 0.805 max. (20.45) 0.697 (17.70) 1 2 3 8 4 7 6 5 0.397 (10.08) 0.000 0.135 (3.43) 0.27 ±0.02 (6.9 ±0.5) 0.000 0.270 max (6.98) 0.27 ±0.02 (6.9 ±0.5) 0.000 0.270 max (6.86) 0.097 (2.46) 0.000 0.018 ± 0.002 dia. (0.46 ± 0.05) 0.980 max. (24.89) Squared corner and dot on top of case indicate pin one. 0.735 (18.67) 0.835 (21.21) Seam Seal Seal hole: 0.056 ±0.002 (1.42 ±0.05) Case dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.3) for two decimal places unless otherwise specified CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin Materials Header Kovar/Nickel/Gold Cover Kovar/Nickel Pins Kovar/Nickel/Gold matched glass seal Case A1, Rev C, 20060110 Please refer to the numerical dimensions for accuracy. All information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. Copyright © 1999-2006 Interpoint Corp. All rights reserved. Figure 4: Case A1 www.craneae.com Page of 10 Rev A - 20070509 Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Class H and K, MIL-PRF-38534 Element Evaluation Space Test Performed Prototype O Class H non-QML1 QML (component level) M/S2 P3 M/S2 P3 Class K QML M/S2 P3 Element Electrical yes no yes yes yes yes Element Visual no no yes yes yes yes Internal Visual no N/A yes N/A yes N/A Temperature Cycling no no no no yes yes Constant Acceleration no no no no yes yes Interim Electrical no N/A no N/A yes N/A Burn-in no N/A no N/A yes N/A Post Burn-in Electrical no N/A no N/A yes N/A Steady State Life no N/A no N/A yes N/A Voltage Conditioning Aging N/A no N/A no N/A yes Visual Inspection no no N/A no N/A yes Final Electrical no no yes yes yes yes Wire Bond Evaluation4 no no yes yes yes yes SEM SLAM™/C-SAM: Input capacitors only (Add’l test, not req. by H or K) no N/A no N/A yes N/A no no yes no yes no Notes: 1. Non-QML products do not meet all of the requirements of MIL-PRF-38534. 2. M/S = Active components (Microcircuit and Semiconductor Die) 3. P = Passive components 4. Not applicable to EMI filters that have no wirebonds. Definitions: Element Evaluation: Component testing/screening per MIL-STD-883 as determined by MIL-PRF-38534 SEM: Scanning Electron Microscopy SLAM™: Scanning Laser Acoustic Microscopy C-SAM: C - Mode Scanning Acoustic Microscopy www.craneae.com Page of 10 Rev A - 20070509 Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Class H and K, MIL-PRF-38534 Environmental Screening Test Performed Space Prototype O (end item level) non-QML1 2 Non-destruct bond pull Method 2023 no Pre-cap Inspection Method 2017, 2032 yes Temperature Cycle (10 times) Method 1010, Cond. C, -65°C to 150°C, ambient yes Constant Acceleration Method 2001, 3000 g yes PIND Test Method 2020, Cond. A no Pre burn-in test yes Burn-in Method 1015, 125°C case, typical 96 hours yes 160 hours no 2 x 160 hour (includes mid BI test) no Final electrical test MIL-PRF-38534 Group A, Subgroups 1 through 6 -55°C, +25°C, +125°C case yes Radiography Method 2012 N/A Post Radiography Electrical Test Room temperature N/A Hermeticity test Fine Leak, Method 1014, Cond. A yes Gross Leak, Method 1014, Cond. C yes Final visual inspection Method 2009 yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Notes: 1. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534. 2. Not applicable to EMI filters that have no wirebonds. 3. Not required by DSCC but performed to assure product quality. www.craneae.com Page of 10 Rev A - 20070509 Class H, QML Class K, QML yes3 yes yes yes yes yes yes yes yes3 yes yes yes no yes no no no yes yes yes N/A yes N/A yes3 yes yes yes yes yes yes Crane Aerospace & Electronics Power Solutions STF28-461 EMI Input Filters 28 Volt input – 0.8 AMP Class H and K, MIL-PRF-38534 Radiation Assurance Product Level AvailabilityEnvironmental Screening Levels space Prototype O Class H Class K Radiation Hardness non-QML3 QML QML Assurance Levels O2: Standard, no radiation guarantee OO HO N/A H1, 5: Radiation tolerant – Tested lots Up to 1,000 K Rads (Si) total dose N/A HH4 KH4 Notes: 1. Our EMI filters are designed exclusively with passive components providing maximum tolerance for space environment requirements. 2. Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA”. 3. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534. 4. Redmond site, Interpoint, has a Radiation Hardness assurance plan on file with DSCC. Our SMD products with RHA "H" code meet DSCC requirements. 5. Space filters are only available with Radiation Hardness Assurance (RHA) levels of “O” and “H”. STF EMI Input Filters, Rev A - 20070509. This revision supercedes all previous releases. All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. STF Series is a trademark of Interpoint. Copyright © 1999 - 2007 Interpoint Corporation. All rights reserved. www.craneae.com Page 10 of 10