ba15218和4558哪个好

看你干嘛用。ba15218设计是耳放专用型运放，具有低噪声和高推力的特性（输出电流在50ma），功率在耳放运放里算中上等（再高的还有70ma级的JRC4556和三菱的一个型号忘了的，罕见的100ma级怪物）。
4558的话是通用运放，输出电流在15ma左右，噪声高，相位差较明显，相比之下不适合推耳机。
不过要是一般的信号放大用途，4558足够用的前提下，用耳放专用运放也可代换，不过是大材小用而已。

是不是找集成运放芯片，一般用LM324就可以了，价格也便宜。LM324内有4个运算放大器
protel中 点击search 搜索栏内输入 LM324 搜索即可找到。号是扩大搜索范围，否则很难找到完全匹配的元件名
集成运算放大器
通用运放(130种)

ALD1704X
ALD1722X
ALD2704X
ALD2722X
ALD4704X
APA4558
APC558
BA10358X
BA14741X
BA4558X
ELM842A
ELM854xA
FAN4272 G1211
G1212
HA17301P
HA17324X
HA17358X
HA17741X
HA17747X
KA1458X
KA201A
KA224
KA248
KA258
KA2902 KA2904
KA301A
KA324
KA3303
KA3403
KA348
KA358
KA4558X
KA5532
KA741X
KF347X
KF351
KF353 KF442X
KIA324X
KIA358X
LM258
LM2904X
LM358
LM6142
LM6144
LMH6645
LMH6646
LMH6647
LS404
MAX4352 MAX4353
MAX4354
MAX4452
MAX4453
MAX4454
MB3614
MB3615
MB47358
MC3405
MM3002
NCV2904
NE5230
NJM12902 NJM12904
NJM13403
NJM13404
NJM14558
NJM1458
NJM2058
NJM2059
NJM2060
NJM2100
NJM2107
NJM2112
NJM2115
NJM2119 NJM2120
NJM2123
NJM2125
NJM2143
NJM2172
NJM2902
NJM324
NJM3403A
NJM3404A
NJM353
NJM4558
NJM4559
NJM4560 NJM4562
NJM4565
NJM4580
NJM4741
NJM741
OP02
OP04
OP09
OP11
OP14
SA5230
TA74358P
TA75060P TA75061P
TA75062X
TA75064X
TA75070P
TA75071X
TA75072X
TA75074X
TA75254P
TA75324X
TA75358X
TA75458X
TA75557X
TA75558X TA75559X
TA75902X
TA75S01F
TA75W01FU
TLC252X
TLC254X
TS274X
TS902
TS912
TS914
TSH24
UA741
UTCM2100

宽频带运放(21种)

AD840
AD841
BB3554
MC33071X
MC33072X MC33074X
MC34071X
MC34072X
MC34074X
MC4558 MX3554
NJM2116
NJM2136
TS612
TS613 TS634
TSH110
TSH111
TSH112
TSH113 TSH114
精密运放(含低漂移、零漂移、低偏流、低偏压、低失调运放和仪器运放)(75种)

AD704
AD705
AD706
AD707
AD708
AD824
AD845
AD846 ALD1702X
ALD1703
ALD1712X
ALD2702X
ALD2711X
ALD4702X
LMV301
LT1006 LT1013
LT1014
LT1152
LT1250
LT1884
LT1885
LTC1051
LTC1053 LTC2050X
LTC2051
LTC2052
MAX400
MAX480
MM1278
MM6558
MXL1001 MXL1013
MXL1014
MXL1178
MXL1179
NJM062
NJM064
NJM072X
NJM074 NJM082X
NJM084
NJM2097
NJMOP-07
NJU7042
NJU7051
NJU7052
NJU7054 NJU7061
NJU7062
NJU7064
OP07-1
OP07-2
OP07C
OP-10
OP-12 OP-15
OP-16
OP-17
OP177
OP193
OP200
OP293
OP493 OP-80
OP90
OP-90
OP-97
PM-1012
PM-155A
PM-156A
PM-157A TS27M4X
TS512X
UA748
低电压运放(63种)

AD8517
AD8527
AD8631
AD8632
CMC7101A
CMV7101
CMV7106
DS4802
FAN4113
FAN4114
LMV921
LMV922
LMV924 LMV981
LT1884
LT1885
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
MAX4289
MAX4291
MAX4292
MAX4294
MAX4464 MAX4470
MAX4471
MAX4472
MAX4474
MC33501
MC33502
MC33503
MIC7111
NCS2001
NCS7101
NE5230
NE5234
NJU7001 NJU7002
NJU7004
NJU7007
NJU7008
NJU7017
NJU7018
NJU7019
NJU7021
NJU7022
NJU7024
NJU7031
NJU7032
NJU7034 SA5230
SA5234
TS1851
TS1852
TS1854
TS1871
TS1872
TS1874
UTCLMV358
XC221A1100MR
XC221A1200MR
比较器(7种)

ALD2301X ALD2302X ALD2303X ALD4302X MB4204 SA58603 TA75W393FU
低功率微功耗运放(90种)
ALD1701X
ALD1706X
ALD1721X
ALD1726X
ALD2701X
ALD2706X
ALD2721X
ALD2726X
ALD4701X ALD4706X
CMC7106
CMV1010
CMV1016
CMV1020
CMV1026
CMV1030
CMV1036
ELM832A LM124
LM158
LM158x
LM224-1
LM224-2
LM258-1
LM258-2
LM258x
LM2902 LM2902X
LM2904-1
LM2904-2
LM2904X
LM324X-1
LM324X-2
LM358
LM358x-1
LM358x-2 LMC6442
LMH6642
LMH6643
LMH6644
MAX4330
MAX4331
MAX4332
MAX4333
MAX4334 MC3303
MC33171
MC33172
MC3403
MC3503
MC35171
MC35172
MCP606
MCP607 MCP608
MCP609
MIC861
MIC910
MIC911
MIC912
MIC913
MIC914
MIC915 MIC916
MIC918
MIC919
NCV2902
NCV2904
NE532
NJM022
NJM022B
NJM2130 NJU7011
NJU7012
NJU7013
NJU7014
NJU7015
NJU7016
NJU7091A
NJU7092A
NJU7093A NJU7094
NJU7095
NJU7096
SA532
SA534
SE532
TS931
TS932
TS934
低噪声运放(45种)
HA-5127X
HA-5137
HA-5137A
HA-5147
HS-5104ARH
HS-5104ARH-T
KIA4558X
KIA4559X
LM381X LM387X
LM833
LMH6654
LMH6655
LT1792
LT1793
MC33077
MC33078
MC33079-1 MC33079-2
MXL1007
NE5532X-1
NE5532X-2
NE5534X-1
NE5534X-2
NJM2041
NJM2043
NJM2068 NJM2114
NJM2122
NJM5532
NJM5534
OP113
OP213
OP27
OP37
OP413 RF2304
RF2314
SA5534X
SE5532X
SE5534X-1
SE5534X-2
TC7652
TS522
TS524
高速运放(29种)

AD711
AD712
AD713
AD843
AD844
AD847 AD848
AD849
ALD1502
ALD2502
ALD4501
BA15218X BA15532X
BA4510X
BA4560X
FAN4230
NJM2121
NJM2710 NJM2716
NJM318
TL3X071X
TL3X072X
TL3X074X
TLV2780X TLV2781X
TLV2782X
TLV2783X
TLV2784X
TLV2785X
低失真运放(5种)

INA103 INA163 LT1115 LT1806 LT1807
高输出电流高驱动能力运放(12种)

AD842
LMH6672
MAX4230 MAX4231
MAX4232
MAX4233 MAX4234
MC33076
NJM3414A NJM4556A
OP176
OP279
可编程运放(5种)

LC7972X LT1167 TLC251X TS271X TS652
其他特殊运放(18种)
BA10324X
BA3131FS
CA3160X
ICL7650X
ICL7652X ICL7653X
LM10
LM201A
LM301A
LT1794 MAX420
MAX421
MAX422
MAX423
MM1462X NJM13600
NJM13700
NJM2140

好。
1、ba15218设计是耳放专用型运放，具有低噪声和高推力的特性（输出电流在50ma），功率在耳放运放里算中上等。
2、该耳机采用最新音量合成装置，声音音质更加稳定较好，更加流畅。

是不是找集成运放芯片，一般用LM324就可以了，价格也便宜。LM324内有4个运算放大器
protel中 点击search 搜索栏内输入 LM324 搜索即可找到。号是扩大搜索范围，否则很难找到完全匹配的元件名
集成运算放大器
通用运放(130种)

ALD1704X
ALD1722X
ALD2704X
ALD2722X
ALD4704X
APA4558
APC558
BA10358X
BA14741X
BA4558X
ELM842A
ELM854xA
FAN4272 G1211
G1212
HA17301P
HA17324X
HA17358X
HA17741X
HA17747X
KA1458X
KA201A
KA224
KA248
KA258
KA2902 KA2904
KA301A
KA324
KA3303
KA3403
KA348
KA358
KA4558X
KA5532
KA741X
KF347X
KF351
KF353 KF442X
KIA324X
KIA358X
LM258
LM2904X
LM358
LM6142
LM6144
LMH6645
LMH6646
LMH6647
LS404
MAX4352 MAX4353
MAX4354
MAX4452
MAX4453
MAX4454
MB3614
MB3615
MB47358
MC3405
MM3002
NCV2904
NE5230
NJM12902 NJM12904
NJM13403
NJM13404
NJM14558
NJM1458
NJM2058
NJM2059
NJM2060
NJM2100
NJM2107
NJM2112
NJM2115
NJM2119 NJM2120
NJM2123
NJM2125
NJM2143
NJM2172
NJM2902
NJM324
NJM3403A
NJM3404A
NJM353
NJM4558
NJM4559
NJM4560 NJM4562
NJM4565
NJM4580
NJM4741
NJM741
OP02
OP04
OP09
OP11
OP14
SA5230
TA74358P
TA75060P TA75061P
TA75062X
TA75064X
TA75070P
TA75071X
TA75072X
TA75074X
TA75254P
TA75324X
TA75358X
TA75458X
TA75557X
TA75558X TA75559X
TA75902X
TA75S01F
TA75W01FU
TLC252X
TLC254X
TS274X
TS902
TS912
TS914
TSH24
UA741
UTCM2100

宽频带运放(21种)

AD840
AD841
BB3554
MC33071X
MC33072X MC33074X
MC34071X
MC34072X
MC34074X
MC4558 MX3554
NJM2116
NJM2136
TS612
TS613 TS634
TSH110
TSH111
TSH112
TSH113 TSH114
精密运放(含低漂移、零漂移、低偏流、低偏压、低失调运放和仪器运放)(75种)

AD704
AD705
AD706
AD707
AD708
AD824
AD845
AD846 ALD1702X
ALD1703
ALD1712X
ALD2702X
ALD2711X
ALD4702X
LMV301
LT1006 LT1013
LT1014
LT1152
LT1250
LT1884
LT1885
LTC1051
LTC1053 LTC2050X
LTC2051
LTC2052
MAX400
MAX480
MM1278
MM6558
MXL1001 MXL1013
MXL1014
MXL1178
MXL1179
NJM062
NJM064
NJM072X
NJM074 NJM082X
NJM084
NJM2097
NJMOP-07
NJU7042
NJU7051
NJU7052
NJU7054 NJU7061
NJU7062
NJU7064
OP07-1
OP07-2
OP07C
OP-10
OP-12 OP-15
OP-16
OP-17
OP177
OP193
OP200
OP293
OP493 OP-80
OP90
OP-90
OP-97
PM-1012
PM-155A
PM-156A
PM-157A TS27M4X
TS512X
UA748
低电压运放(63种)

AD8517
AD8527
AD8631
AD8632
CMC7101A
CMV7101
CMV7106
DS4802
FAN4113
FAN4114
LMV921
LMV922
LMV924 LMV981
LT1884
LT1885
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
MAX4289
MAX4291
MAX4292
MAX4294
MAX4464 MAX4470
MAX4471
MAX4472
MAX4474
MC33501
MC33502
MC33503
MIC7111
NCS2001
NCS7101
NE5230
NE5234
NJU7001 NJU7002
NJU7004
NJU7007
NJU7008
NJU7017
NJU7018
NJU7019
NJU7021
NJU7022
NJU7024
NJU7031
NJU7032
NJU7034 SA5230
SA5234
TS1851
TS1852
TS1854
TS1871
TS1872
TS1874
UTCLMV358
XC221A1100MR
XC221A1200MR
比较器(7种)

ALD2301X ALD2302X ALD2303X ALD4302X MB4204 SA58603 TA75W393FU
低功率微功耗运放(90种)
ALD1701X
ALD1706X
ALD1721X
ALD1726X
ALD2701X
ALD2706X
ALD2721X
ALD2726X
ALD4701X ALD4706X
CMC7106
CMV1010
CMV1016
CMV1020
CMV1026
CMV1030
CMV1036
ELM832A LM124
LM158
LM158x
LM224-1
LM224-2
LM258-1
LM258-2
LM258x
LM2902 LM2902X
LM2904-1
LM2904-2
LM2904X
LM324X-1
LM324X-2
LM358
LM358x-1
LM358x-2 LMC6442
LMH6642
LMH6643
LMH6644
MAX4330
MAX4331
MAX4332
MAX4333
MAX4334 MC3303
MC33171
MC33172
MC3403
MC3503
MC35171
MC35172
MCP606
MCP607 MCP608
MCP609
MIC861
MIC910
MIC911
MIC912
MIC913
MIC914
MIC915 MIC916
MIC918
MIC919
NCV2902
NCV2904
NE532
NJM022
NJM022B
NJM2130 NJU7011
NJU7012
NJU7013
NJU7014
NJU7015
NJU7016
NJU7091A
NJU7092A
NJU7093A NJU7094
NJU7095
NJU7096
SA532
SA534
SE532
TS931
TS932
TS934
低噪声运放(45种)
HA-5127X
HA-5137
HA-5137A
HA-5147
HS-5104ARH
HS-5104ARH-T
KIA4558X
KIA4559X
LM381X LM387X
LM833
LMH6654
LMH6655
LT1792
LT1793
MC33077
MC33078
MC33079-1 MC33079-2
MXL1007
NE5532X-1
NE5532X-2
NE5534X-1
NE5534X-2
NJM2041
NJM2043
NJM2068 NJM2114
NJM2122
NJM5532
NJM5534
OP113
OP213
OP27
OP37
OP413 RF2304
RF2314
SA5534X
SE5532X
SE5534X-1
SE5534X-2
TC7652
TS522
TS524
高速运放(29种)

AD711
AD712
AD713
AD843
AD844
AD847 AD848
AD849
ALD1502
ALD2502
ALD4501
BA15218X BA15532X
BA4510X
BA4560X
FAN4230
NJM2121
NJM2710 NJM2716
NJM318
TL3X071X
TL3X072X
TL3X074X
TLV2780X TLV2781X
TLV2782X
TLV2783X
TLV2784X
TLV2785X
低失真运放(5种)

INA103 INA163 LT1115 LT1806 LT1807
高输出电流高驱动能力运放(12种)

AD842
LMH6672
MAX4230 MAX4231
MAX4232
MAX4233 MAX4234
MC33076
NJM3414A NJM4556A
OP176
OP279
可编程运放(5种)

LC7972X LT1167 TLC251X TS271X TS652
其他特殊运放(18种)
BA10324X
BA3131FS
CA3160X
ICL7650X
ICL7652X ICL7653X
LM10
LM201A
LM301A
LT1794 MAX420
MAX421
MAX422
MAX423
MM1462X NJM13600
NJM13700
NJM2140

ba15218引脚功能为8脚双列直插式塑料封装。根据查询相关公开信息显示BA15218是双运算放大器，为8脚双列直插式塑封，广泛用于录像机、影碟机电路中。在JVCHR-D660ED／HR-D36ED型录像机和马兰士CDV-70K型影碟机上的正常工作电压典型检测数据分别所列，用MF14型三用表测得（DC挡）。

好。XRA15218N是音频信号放大电路，为8脚双列直插式塑料封装，在松下TC－29V30R、TC25V40R型大屏幕彩电右（R）声道超低音。xra15218运放音质好；其音色很有个性、低噪声、声音轮廓鲜明、解析力高、声音柔顺、中频具有胆机柔美润泽的特点。

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