UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 4
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
(X) Check this box if no longer subject to Section 16.
Form 4 or Form 5 obligations may continue. See Instructions 1(b).
1. Name and Address of Reporting Person
   Erdmann, Dietrich
   c/o Unitrode Corporation
   7Continental Boulevard
   Merrimack, NH  03054
   USA
2. Issuer Name and Ticker or Trading Symbol
   Unitrode Corporation
   UTR
3. IRS or Social Security Number of Reporting Person (Voluntary)

4. Statement for Month/Year
   October 31, 1999
5. If Amendment, Date of Original (Month/Year)

6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
   (X) Director ( ) 10% Owner ( ) Officer (give title below) ( ) Other
   (specify below)

7. Individual or Joint/Group Filing (Check Applicable Line)
   (X) Form filed by One Reporting Person
   ( ) Form filed by More than One Reporting Person
<TABLE>
<CAPTION>
___________________________________________________________________________________________________________________________________
 Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned                                                 |
___________________________________________________________________________________________________________________________________|
1. Title of Security       |2.    |3.    |4.Securities Acquired (A)         |5.Amount of        |6.Dir |7.Nature of Indirect       |
                           | Transaction |  or Disposed of (D)              |  Securities       |ect   |  Beneficial Ownership     |
                           |      |      |                                  |  Beneficially     |(D)or |                           |
                           |      |    | |                  | A/|           |  Owned at         |Indir |                           |
                           | Date |Code|V|    Amount        | D |    Price  |  End of Month     |ect(I)|                           |
___________________________________________________________________________________________________________________________________|
<S>                        <C>    <C>  <C><C>               <C> <C>         <C>                 <C>    <C>
Common Stock               |10/15/|J (1| |605,212           |D  |(1)        |0                  |D     |                           |
                           |99    |)   | |                  |   |           |                   |      |                           |
-----------------------------------------------------------------------------------------------------------------------------------|
___________________________________________________________________________________________________________________________________|
<CAPTION>
___________________________________________________________________________________________________________________________________
 Table II -- Derivative Securitites Acquired, Disposed of, or Beneficially Owned                                                   |
___________________________________________________________________________________________________________________________________|
1.Title of Derivative |2.Con-  |3.   |4.    |5.Number of De |6.Date Exer|7.Title and Amount  |8.Price|9.Number    |10.|11.Nature of|
  Security            |version |Transaction | rivative Secu |cisable and|  of Underlying     |of Deri|of Deriva   |Dir|Indirect    |
                      |or Exer |     |      | rities Acqui  |Expiration |  Securities        |vative |tive        |ect|Beneficial  |
                      |cise    |     |      | red(A) or Dis |Date(Month/|                    |Secu   |Securities  |(D)|Ownership   |
                      |Price of|     |      | posed of(D)   |Day/Year)  |                    |rity   |Benefi      |or |            |
                      |Deriva- |     |      |               |Date |Expir|                    |       |ficially    |Ind|            |
                      |tive    |     |      |           | A/|Exer-|ation|   Title and Number |       |Owned at    |ire|            |
                      |Secu-   |     |    | |           | D |cisa-|Date |   of Shares        |       |End of      |ct |            |
                      |rity    |Date |Code|V|  Amount   |   |ble  |     |                    |       |Month       |(I)|            |
___________________________________________________________________________________________________________________________________|
<S>                   <C>      <C>   <C>  <C><C>        <C> <C>   <C>   <C>          <C>     <C>     <C>          <C> <C>
Stock Option (right to|$13.50  |10/15|J (2| |4,000      |D  |2/3/9|8/3/0|Common Stock|4,000  |(2)    |0           |D  |            |
 buy)                 |        |/99  |)   | |           |   |9    |8    |            |       |       |            |   |            |
-----------------------------------------------------------------------------------------------------------------------------------|
                      |        |     |    | |           |   |     |     |            |       |       |            |   |            |
___________________________________________________________________________________________________________________________________|
</TABLE>
Explanation of Responses:
(1) Exchanged for303,997.98 shares of common stock of Texas Instruments
Incorporated ("TXN"), having a value of
$83.375 per share, pursuant to a merger of Unitrode Corporation ("UTR") and TXN
(the"Merger").
(2) These options were assumed by TXN in the Merger and are now exercisable for
 .5023 shares (the "Exchange
Ratio") of TXN common stock for each share of UTR common stock, on the same
terms, at an exercise price for TXN
options determined by dividing the UTR exercise price by the Exchange
Ratio.
SIGNATURE OF REPORTING PERSON
/s/ Dietrich Erdmann
DATE
November 1, 1999
[{"type": "4", "sequence": "1", "description": "FORM 4 - OCTOBER 31, 1999", "secsgml_size_bytes": 5935}]
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 4
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
(X) Check this box if no longer subject to Section 16.
Form 4 or Form 5 obligations may continue. See Instructions 1(b).
1. Name and Address of Reporting Person
   Erdmann, Dietrich
   c/o Unitrode Corporation
   7Continental Boulevard
   Merrimack, NH  03054
   USA
2. Issuer Name and Ticker or Trading Symbol
   Unitrode Corporation
   UTR
3. IRS or Social Security Number of Reporting Person (Voluntary)

4. Statement for Month/Year
   October 31, 1999
5. If Amendment, Date of Original (Month/Year)

6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
   (X) Director ( ) 10% Owner ( ) Officer (give title below) ( ) Other
   (specify below)

7. Individual or Joint/Group Filing (Check Applicable Line)
   (X) Form filed by One Reporting Person
   ( ) Form filed by More than One Reporting Person
___________________________________________________________________________________________________________________________________
 Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned                                                 |
___________________________________________________________________________________________________________________________________|
1. Title of Security       |2.    |3.    |4.Securities Acquired (A)         |5.Amount of        |6.Dir |7.Nature of Indirect       |
                           | Transaction |  or Disposed of (D)              |  Securities       |ect   |  Beneficial Ownership     |
                           |      |      |                                  |  Beneficially     |(D)or |                           |
                           |      |    | |                  | A/|           |  Owned at         |Indir |                           |
                           | Date |Code|V|    Amount        | D |    Price  |  End of Month     |ect(I)|                           |
___________________________________________________________________________________________________________________________________|
Common Stock               |10/15/|J (1| |605,212           |D  |(1)        |0                  |D     |                           |
                           |99    |)   | |                  |   |           |                   |      |                           |
-----------------------------------------------------------------------------------------------------------------------------------|
___________________________________________________________________________________________________________________________________|
___________________________________________________________________________________________________________________________________
 Table II -- Derivative Securitites Acquired, Disposed of, or Beneficially Owned                                                   |
___________________________________________________________________________________________________________________________________|
1.Title of Derivative |2.Con-  |3.   |4.    |5.Number of De |6.Date Exer|7.Title and Amount  |8.Price|9.Number    |10.|11.Nature of|
  Security            |version |Transaction | rivative Secu |cisable and|  of Underlying     |of Deri|of Deriva   |Dir|Indirect    |
                      |or Exer |     |      | rities Acqui  |Expiration |  Securities        |vative |tive        |ect|Beneficial  |
                      |cise    |     |      | red(A) or Dis |Date(Month/|                    |Secu   |Securities  |(D)|Ownership   |
                      |Price of|     |      | posed of(D)   |Day/Year)  |                    |rity   |Benefi      |or |            |
                      |Deriva- |     |      |               |Date |Expir|                    |       |ficially    |Ind|            |
                      |tive    |     |      |           | A/|Exer-|ation|   Title and Number |       |Owned at    |ire|            |
                      |Secu-   |     |    | |           | D |cisa-|Date |   of Shares        |       |End of      |ct |            |
                      |rity    |Date |Code|V|  Amount   |   |ble  |     |                    |       |Month       |(I)|            |
___________________________________________________________________________________________________________________________________|
Stock Option (right to|$13.50  |10/15|J (2| |4,000      |D  |2/3/9|8/3/0|Common Stock|4,000  |(2)    |0           |D  |            |
 buy)                 |        |/99  |)   | |           |   |9    |8    |            |       |       |            |   |            |
-----------------------------------------------------------------------------------------------------------------------------------|
                      |        |     |    | |           |   |     |     |            |       |       |            |   |            |
___________________________________________________________________________________________________________________________________|
Explanation of Responses:
(1) Exchanged for303,997.98 shares of common stock of Texas Instruments
Incorporated ("TXN"), having a value of
$83.375 per share, pursuant to a merger of Unitrode Corporation ("UTR") and TXN
(the"Merger").
(2) These options were assumed by TXN in the Merger and are now exercisable for
 .5023 shares (the "Exchange
Ratio") of TXN common stock for each share of UTR common stock, on the same
terms, at an exercise price for TXN
options determined by dividing the UTR exercise price by the Exchange
Ratio.
SIGNATURE OF REPORTING PERSON
/s/ Dietrich Erdmann
DATE
November 1, 1999