SDAA162 July   2026 ADS125H18 , ISO7721 , ISO7730 , ISO7731 , SN6505B , SN74LVC1G17 , TUSB320 , TVS3301

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Design Overview and Measurement Performance (Normal Operation)
    1. 1.1 Design Overview
    2. 1.2 EMC Test Board Voltage Measurement Performance During Normal Operation
    3. 1.3 EMC Test Board Current Measurement Performance During Normal Operation
  5. 2EMC Test Board Circuit and PCB Layout Considerations
    1. 2.1 Circuit Design Considerations for EMC Compliance
      1. 2.1.1 High-Voltage Capacitors and Resistors on Every Input Connector Pin
      2. 2.1.2 TVS Diodes
      3. 2.1.3 Protecting the Current Shunt: PTC and Zener Diodes
      4. 2.1.4 Series Resistors on Digital Signals
      5. 2.1.5 Digital Isolation
      6. 2.1.6 Power Supply and Protection
      7. 2.1.7 High-Voltage Capacitors and Resistors for Discharging Path
    2. 2.2 PCB Layout Considerations for EMC Compliance
      1. 2.2.1 PCB Layer Stack-up and Ground Plane
      2. 2.2.2 Avoiding a Long Return Path
      3. 2.2.3 Avoiding 90-Degree Bends in PCB Traces
      4. 2.2.4 Using a Guard Ring to Isolate Interference Signals
      5. 2.2.5 Decoupling Capacitors
      6. 2.2.6 Differential Signal Routing
      7. 2.2.7 Stitching Vias
      8. 2.2.8 Layout for Isolation Barrier
      9. 2.2.9 Component Placement
  6. 3EMC Test System, Standards, and Results
    1. 3.1 EMC Test System
    2. 3.2 EMC Test Standards
    3. 3.3 EMC Test Results
      1. 3.3.1 Electrostatic Discharge (ESD)
      2. 3.3.2 Radiated Immunity (RI)
      3. 3.3.3 Electrical Fast Transients (EFT)
      4. 3.3.4 Surge Immunity (SI)
      5. 3.3.5 Conducted Immunity (CI)
  7. 4Schematic, PCB Layout and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials (BOM)
  8. 5Summary
  9. 6References

4.3 Bill of Materials (BOM)

Table 4-1 lists the bill of materials (BOM) for the ADS125H18 EMC test board.

Table 4-1 Bill of Materials
DesignatorQuantityValueDescriptionPackage ReferencePart NumberManufacturer
C1, C2, C9, C10, C11, C12, C19, C20, C21, C22, C29, C30, C31, C32, C39, C4016100pFCAP, CERM, 100 pF, 50 V, +/- 5%, C0G/NP0, 0603603C0603C101J5GACKemet
C3, C4, C7, C8, C13, C14, C17, C18, C23, C24, C27, C28, C33, C34, C37, C38160.022uFCAP, CERM, 0.022 uF, 1000 V, +/- 10%, X7R, 12101210GRM32DR73A223KW01LMuRata
C5, C6, C15, C16, C25, C26, C35, C3681000pFCAP, CERM, 1000 pF, 100 V, +/- 5%, C0G/NP0, 0603603GRM1885C2A102JA01DMuRata
C41, C46, C56, C79447uFCAP, CERM, 47 uF, 25 V, +/- 20%, X5R, 1206_1901206_190C3216X5R1E476M160ACTDK
C42, C43, C59, C6042200pFCAP, CERM, 2200 pF, 3000 V, +/- 10%, X7R, 181218121812HC222KAT1AAVX
C44, C53, C57, C81447uFCAP, CERM, 47 uF, 10 V, +/- 20%, X5R, 0805805C2012X5R1A476M125ACTDK
C45, C58, C64, C65, C66, C67, C68, C69, C8091uFCAP, CERM, 1 µF, 25 V,+/- 10%, X7R, AEC-Q200 Grade 1, 0603603CGA3E1X7R1E105K080ACTDK
C47147uFCAP, AL, 47 uF, 35 V, +/- 20%, 1 ohm, SMDF55EMVY350ADA470MF55GChemi-Con
C4811000pFCAP, CERM, 1000 pF, 50 V, +/- 1%, C0G/NP0, 0603603GRM1885C1H102FA01JMuRata
C49, C52, C55, C78410uFCAP, CERM, 10 uF, 50 V, +/- 10%, X5R, 1206_1901206_190CL31A106KBHNNNESamsung Electro-Mechanics
C50, C62, C63, C70, C71, C74, C75, C9080.1uFCAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, 0603603C0603C104K5RACTUKemet
C51, C54, C7731uFCAP, CERM, 1 uF, 25 V, +/- 10%, X7R, 060360306033C105KAT2AAVX
C61, C7620.1uFCAP, CERM, 0.1 uF, 25 V, +/- 5%, X7R, 0603603C0603C104J3RACTUKemet
C72, C73210uFCAP, CERM, 10 uF, 25 V, +/- 10%, X7R, 1206_1901206_190C1206C106K3RACTUKemet
C82, C85, C8730.1uFCAP, CERM, 0.1 uF, 100 V, +/- 10%, X7R, 0805805CL21B104KCFSFNESamsung Electro-Mechanics
C83, C84, C86310uFCAP, CERM, 10 uF, 25 V, +/- 10%, X7R, 0805805GRM21BZ71E106KE15LMuRata
D1, D2, D3, D4, D5, D6, D7, D8, D10, D12, D14, D161211VDiode, Zener, 11 V, 550 mW, SMBSMB1SMB5926BT3GON Semiconductor
D1715VDiode, TVS, Uni, 5 V, 9.2 Vc, SMBSMBSMBJ5.0A-13-FDiodes Inc.
D18130VDiode, Schottky, 30 V, 5 A, SOD-128SOD-128PMEG3050EP,115Nexperia

D19, D20, D21, D27

440VDiode, Schottky, 40 V, 1 A, SOD-123SOD-1231N5819HW-7-FDiodes Inc.
D2213.3VDiode, TVS, Uni, 3.3 V, 7.3 Vc, AEC-Q101, SMBSMBSMBJ3V3-E3/52Vishay-Semiconductor
D23, D24, D25, D264GreenLED, Green, SMDLED_0805APT2012LZGCKKingbright
D28128VDiode, TVS, Uni, 28 V, 45.4 Vc, SMCSMC5.0SMDJ28ALittelfuse
D2916VDiode, TVS, Uni, 6 V, 10.3 Vc, SMBSMBSMBJ6.0A-13-FDiodes Inc.
D30113VDiode, TVS, Uni, 13 V, 21.5 Vc, SMCSMC5.0SMDJ13ALittelfuse
D311GreenLED, Green, SMD1.7x0.65x0.8mmLG L29K-G2J1-24-ZOSRAM
F1, F2, F3, F4, F6, F86Fuse, Resettable, 0.2 A, 24 VDC, SMD1206NANOASMDCH020F-2Littelfuse
FB1170 Ohms @ 100MHz 1 Power Line Ferrite Bead 0603 (1608 Metric) 4A 20mOhm603BLM18SG700TN1DMurata
H1, H5, H9, H114MACHINE SCREW PAN PHILLIPS 4-40Machine Screw, 4-40, 1/4 inchPMSSS 440 0025 PHB&F Fastener Supply
H2, H7, H10, H124Hex Standoff, #4-40, Aluminum, 1/4"1/4 inch Aluminum Hex Standoff1891Keystone
H3, H62Machine Screw Pan PHILLIPS M3RM3X4MM 2701APM HEXSEAL
H4, H82ROUND STANDOFF M3 STEEL 5MMROUND STANDOFF M3 STEEL 5MM9774050360RWurth Elektronik
J1, J2, J3, J4, J5, J6, J7, J88Terminal Block, 3.5mm, 2x1, Tin, THReceptacle, 3.5mm, 2x1, TH6.91214E+11Wurth Elektronik
J9, J132Terminal Block, 2x1, 3.81mm, R/A, THConnector, 2 pos. 3.8mm RA1803277Phoenix Contact
J101Header(Shrouded), 19.7mil, 30x2, Gold, SMTHeader (Shrouded), 19.7mil, 30x2, SMTQTH-030-01-L-D-ASamtec
J141Connector, Receptacle, USB Type C, R/AConnector, Receptacle, USB Type C, R/A, THT/SMT6.32723E+11Wurth Elektronik
JP11Header, 100mil, 3x1, Gold, TH3x1 HeaderTSW-103-07-G-SSamtec
K1, K22Relay, SPST-NO (1 Form A), 0.7 A, SMD4.089x3.81mmCPC1002NTRIXYS
L1, L221000 ohmFerrite Bead, 1000 ohm @ 100 MHz, 0.4 A, 12061206HZ1206D102R-10Laird-Signal Integrity Products
L312.2uHInductor, Shielded Drum Core, Ferrite, 2.2 uH, 1.15 A, 0.088 ohm, SMD2.8 x 1.35 x 2.8mm744029002Wurth Elektronik
R1, R2, R6, R7, R8, R9, R13, R14, R15, R16, R19, R20, R21, R22, R25, R2616100RES, 100, 0.1%, 0.1 W, 0603603RG1608P-101-B-T5Susumu Co Ltd
R3, R5, R10, R12, R18, R246249RES, 249, 0.1%, 0.25 W, 12061206TNPW1206249RBEEAVishay-Dale
R4, R112649RES, 649, 0.1%, 0.1 W, 0603603RT0603BRD07649RLYageo America
R27, R29, R49, R504RES SMD 3.3M OHM 1% 1/2W 20102010CHV2010-FX-3304ELFBourns
R28, R3720RES, 0, 1%, 0.5 W, 120612065108Keystone
R30, R33, R40, R9140.1RES, 0.1, 1%, 0.1 W, AEC-Q200 Grade 0, 0603603ERJ-3RSFR10VPanasonic
R31, R32, R34, R35, R43, R44, R47, R77, R78, R79, R80, R81, R82, R83, R84, R85, R86170RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603603CRCW06030000Z0EAVishay-Dale
R38, R39, R41, R4246.65kRES, 6.65 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402402CRCW04026K65FKEDVishay-Dale
R51, R55, R56, R63, R64, R74, R92710.0kRES, 10.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603603CRCW060310K0FKEAVishay-Dale
R52, R53, R54, R57, R58, R59, R61, R62, R65, R66, R67, R69, R71, R72, R731549.9RES, 49.9, 0.5%, 0.1 W, 0603603RT0603DRE0749R9LYageo America
R6810RES, 0, 0.75 W, AEC-Q200 Grade 0, 12061206CRCW12060000Z0EAHPVishay-Dale
R7010RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603603ERJ-3GEY0R00VPanasonic
R75, R7620RES, 0, 5%, 0.25 W, AEC-Q200 Grade 0, 12061206ERJ-8GEY0R00VPanasonic
R8915.00kRES, 5.00 k, 0.1%, 0.2 W, 0805805PNM0805E5001BST5Vishay Thin Film
R901156kRES, 156 k, 0.1%, 0.125 W, 0805805RT0805BRD07156KLYageo America
R9411.60kRES, 1.60 k, 0.1%, 0.1 W, 0603603RG1608P-162-B-T5Susumu Co Ltd
R951909kRES, 909 k, 1%, 0.1 W, 0603603RC0603FR-07909KLYageo
R99, R100, R101, R102, R103, R104, R105, R106, R107, R108, R109, R110, R111, R112, R113, R1141610MegRES, 10 M, 5%, 0.5 W, 20102010HVC2010-10MJT3TT Electronics/IRC
T11350uHTransformer, 350 uH, SMT7.14x6.73mm750316769Wurth Elektronik
U1, U2, U3, U4, U5, U6, U7, U8, U9, U10, U11, U12, U13, U14, U15, U161633 V Bidirectional Flat-Clamp Surge Protection Device, DRB0008A (VSON-8)DRB0008ATVS3301DRBRTexas Instruments
U17, U18, U20336V, 1A, 4.17μVRMS, RF Low-Dropout (LDO) Voltage Regulator, RGW0020A (VQFN-20)RGW0020ATPS7A4700RGWRTexas Instruments
U191Low-Noise 1 A, 420 kHz Transformer Driver, DBV0006A (SOT-23-6)DBV0006ASN6505BDBVRTexas Instruments
U211I2C BUS EEPROM (2-Wire), TSSOP-B8TSSOP-8BR24G32FVT-3AGE2Rohm
U221High Speed, Robust EMC Triple-Channel Digital Isolators, DW0016B (SOIC-16)DW0016BISO7731DWRTexas Instruments
U231High Speed, Robust EMC Reinforced Dual-Channel Digital Isolator, DW0016B (SOIC-16)DW0016BISO7721DWTexas Instruments
U241ADS125H18IRHBRVQFN36ADS125H18IRHBRTexas Instruments
U251High Speed, Robust EMC Triple-Channel Digital Isolators, DW0016B (SOIC-16)DW0016BISO7730DWRTexas Instruments
U261Single Schmitt-Trigger Buffer, DCK0005A, SMALL T&RDCK0005ASN74LVC1G17DCKTTexas Instruments
U27136V, 1A, 4.17μVRMS, RF Low-Dropout (LDO) Voltage Regulator, RGW0020A (VQFN-20)RGW0020ATPS7A4701RGWRTexas Instruments
U281USB Type-C for USB 2.0 CC Port Controller, RWB0012A (X2QFN-12)RWB0012ATUSB320IRWBRTexas Instruments
D9, D11, D13, D15011VDiode, Zener, 11 V, 550 mW, SMBSMB1SMB5926BT3GON Semiconductor
FID1, FID2, FID30Fiducial mark. There is nothing to buy or mount.N/AN/AN/A
J110Header, 100mil, 7x2, Gold, TH7x2 HeaderTSW-107-07-G-DSamtec
J120Header, 100mil, 8x2, Gold, TH8x2 HeaderTSW-108-07-G-DSamtec
R17, R230249RES, 249, 0.1%, 0.25 W, 12061206TNPW1206249RBEEAVishay-Dale
R36, R45, R46, R48, R60, R87, R88, R96, R97, R9800RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603603CRCW06030000Z0EAVishay-Dale
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP150Terminal, Turret, TH, DoubleKeystone1593-21593-2Keystone