
87C51/80C51BH/80C31BH
Thermal Impedance
All thermal impedance data is approximate for static
air conditions at 1W of power dissipation. Values will
change depending on operating conditions and ap-
plications. See the Intel Packaging Handbook (Order
No. 240800) for a description of Intel's thermal im-
pedance test methodology.
θJA
θJC
Device
45
°C/W
16
°C/W
87C51
75
°C/W
23
°C/W
BH
45
°C/W
15
°C/W
87C51
36
°C/W
13
°C/W
BH
46
°C/W
16
°C/W
All
98
°C/W
24
°C/W
All
DATA SHEET REVISION HISTORY
Data sheets are changed as new device information
becomes available. Verify with your local Intel sales
office that you have the latest version before finaliz-
ing a design or ordering devices.
The following differences exist between this data-
sheet (272335-003) and the previous version
(272335-002):
1. Removed – 20 and – 3 spec, replaced with – 24
spec.
2. Added – 24 spec.
3. 80C51BHP is replaced by 80C51BH with 64-byte
encryption table submitted and lock bit 1 set.
4. 80C51BH/80C31BH are now having some addi-
tional features as 87C51.
5. Revised PRST value and ICC idle values.
6. Added P3.3 control pin to programming and veri-
fication.
7. Added 80C51BH signature byte.
The following differences exist between the ``-002''
and the ``-001'' version of the 87C51/80C51BH/
80C31BH datasheet.
1. Removed - L, IOL = ± 10 mA from Float Wave-
forms figure.
2. Removed QP, QD and QN (commercial with ex-
tended burn-in) from Table 3. Prefix Identification.
This data sheet (272335-001) replaces the following:
80C51BH/80C31BH Express
270218-003
80C51BHP
270603-004
87C51/80C51BH/80C31BH
270147-008
87C51 Express
270430-002
87C51-20/-3
272082-002
21
87C51
BH
87C51
BH
All
The following differences exist between this data-
sheet (272335-004) and the previous version
(272335-003):
1. Product prefix variables are now indicated with an x.