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Intel 486SX Processors
 

A80486SX
Package
Vcc
TCASE
Level 1 Cache		 168—pin ceramic PGA
5V ± 10%
0°C - +85°C
8—Kbyte, set—associative, unified code & data cache

Core Speed

Condition

16MHz

Desoldered
A80486SX-16
SX431
Core Speed 16MHz A80486SX-16 SX431 (sSpec on second line)
Core Speed 16MHz A80486SX-16 SX545 LOW POWER
Core Speed 16MHz
A80486SX-16
SX548
Core Speed 16MHz A80486SX-16 SX677
Core Speed

Reset ID
Stepping

 20MHz

0420
A0
A80486SX-20
SX406

Core Speed

20MHz

 A80486SX-20 SX467
Core Speed 20MHz A80486SX-20 SX492 LOW POWER

Core Speed

Reset ID
Stepping

20MHz

0422
B0
A80486SX-20
SX678

Core Speed

25MHz

 A80486SX-25 SK798 (Remarked from A80486SX-33 SX798)
Core Speed 25MHz A80486SX-25 SX411
Core Speed

Reset ID
Stepping

 25MHz

0422
B0
A80486SX-25
SX468

Core Speed

25MHz

 A80486SX-25 SX514 LOW POWER

Core Speed

Reset ID
Stepping

25MHz

0422
B0
A80486SX-25
SX679

Core Speed

25MHz

 A80486SX-25 SX693
Core Speed 25MHz A80486SX-25 SX719 LOW POWER

Core Speed

CPUID
Stepping

25MHz

042A
aA0 or aA1
A80486SX-25
SX790

Core Speed

CPUID
Stepping

25MHz

0423
bBx
A80486SX-25
SX798

Core Speed

Reset ID
Stepping

25MHz

0422
B0
A80486SX-25
SX826

Core Speed

25MHz

 A80486SX-25 SX846

Core Speed

CPUID
Stepping

25MHz

0423
bBx
A80486SX-25
SX903

Core Speed

25MHz

 A80486SX-25 SX930
Core Speed 33MHz A80486SX-33 Q0575 ES
Core Speed 33MHz A80486SX-33 SK903 (Remarked from A80486SX-25 SX903)
Core Speed 33MHz A80486SX-33 SK798 (Remarked from A80486SX-25 SX798)

Core Speed

Reset ID
Stepping

33MHz

0422
B0
A80486SX-33
SX680

Core Speed

CPUID
Stepping

33MHz

042A
aA0 or aA1
A80486SX-33
SX789

Core Speed

CPUID
Stepping

33MHz

0423
bBx
A80486SX-33
SX797

Core Speed

CPUID
Stepping

33MHz

042B
aB0 or aC0
A80486SX-33
SX847

Core Speed

CPUID
Stepping

33MHz

0423
bBx
A80486SX-33
SX902

Core Speed

CPUID
Stepping

33MHz

042B
aB0 or aC0
A80486SX33
SX931
Core Speed 33MHz A80486SX33 SX931 (White Print)

FA80486SX
Package
Vcc
TCASE
Level 1 Cache
Comment:		 176—lead TQFP
3V ± 10%
0°C - +85°C
8—Kbyte, write—through, unified code & data cache
Embedded Ultra-Low Power 486SX
Core Speed 33MHz FA08486SX-33 Q0742
Core Speed 33MHz FA80486SX-33 Q0743

FA80486SXSF
Package
Vcc
 
TCASE
Level 1 Cache
Comment:		 176—lead TQFP
3V +10% / -20% (25MHz)
3V ± 10% (33MHz)
0°C - +85°C
8—Kbyte, write—through, unified code & data cache
Embedded Ultra-Low Power 486SX
Core Speed 33MHz or 25MHz FA80486SXSF-33

KU80486SX
Package
Vcc
TCASE
Level 1 Cache		 196—pin PQFP
5V -10% / +5%
0°C - +85°C
8—Kbyte, set—associative, unified code & data cache
Core Speed 20MHz KU80486SX-20 SX587
Core Speed 20MHz KU80486SX-20 SX632
Core Speed 20MHz KU80486SX-20 SZ700
Core Speed 25MHz KU80486SX-25 SX586
Core Speed 25MHz KU80486SX-25-LP

Core Speed

Reset ID
Stepping

25MHz

0422
B0
KU80486SX25
SX673
Core Speed 25MHz KU80486SX-25 SX676

Core Speed

Reset ID
Stepping

25MHz

0428
cB0
KU80486SX25
SX683
Core Speed 25MHz KU80486SX-25 SX763
Core Speed 25MHz KU80486SX-25 SX779
Core Speed 25MHz KU80486SX-25 SX788
Core Speed 25MHz KU80486SX-25 SX792
Core Speed 25MHz
KU80486SX25
SX800
Core Speed 20MHz KU80486SX-33 SX587
This is a fake. SX587 runs at 20MHz.

Core Speed

Reset ID
Stepping

Comment

 

33MHz

0422
B0

Should be 0428
(cB0), probably
fake

KU80486SX33
SX684

Core Speed

Reset ID
Stepping

33MHz

0428
cB0
KU80486SX33
SX684
Core Speed 33MHz KU80486SX-33 SX724
Core Speed 33MHz KU80486SX-33 SX780
Core Speed 33MHz KU80486SX-33 SX791
Core Speed 33MHz KU80486SX-33 SX799
Core Speed 33MHz KU80486SX-33 SX849

KU80486SXSA (Embedded)
Package
Vcc
TCASE
Level 1 Cache
Comment:		 196—lead PQFP
5V ± 5%
0°C - +85°C
8—Kbyte, write—through, unified code & data cache
Embedded 486SX
Core Speed 33MHz KU80486SXSA33

SB80486SX
Package
Vcc
TCASE
Level 1 Cache		 208—lead SQFP
3.3V ± 0.3V
0°C - +85°C
8—Kbyte, set—associative, unified code & data cache
Core Speed 25MHz SB80486SX-25 SX764
Core Speed 25MHz SB80486SX-25 SX796
Core Speed 33MHz
SB80486SX-33
SX774
Core Speed 33MHz SB80486SX-33 SX830
Core Speed 33MHz
SB80486SX-33
SX855

SB80486SXSC (Embedded)
Package
Vcc
TCASE
Level 1 Cache
Comment:		 208—lead SQFP
3.3V ± 0.3V
0°C - +85°C
8—Kbyte, write—through, unified code & data cache
Embedded 486SX
Core Speed 33MHz SB80486SXSC33

A80486SX2
Package
Vcc
TCASE
Level 1 Cache		 168—pin ceramic PGA
5V ± 10%
0°C - +85°C
8—Kbyte, set—associative, unified code & data cache

Core Speed
Bus Speed

40MHz
20MHz

 A80486SX2-40 SX722

Core Speed
Bus Speed

CPUID
Stepping

50MHz
25MHz

045B
aC0
A80486SX2-50
SX845

Core Speed
Bus Speed

CPUID
Stepping

50MHz
25MHz

045B
aC0
A80486SX2-50
SX845

Core Speed
Bus Speed

50MHz
25MHz

 A80486SX2-50 SZ901

Core Speed
Bus Speed

66MHz
33MHz

 A80486SX2-66 Q0569