# Voltage Regulator Part# Does Not Match Exactly **URL:** \ **Category:** Integrated Circuits (ICs)\ **Tags:** stmicroelectronics, cross-reference, power-management-pmic, part-comparison\ **Created:** [August 28, 2020, 6:01pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304 "2020-08-28T18:01:14Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![hp-je513l](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@hp-je513l](https://forum.digikey.com/u/hp-je513l)\ **Post date:** [August 28, 2020, 6:01pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/1 "2020-08-28T18:01:14Z")
Hi, I need L78M05ABV but digikey gives me 497-15725-5-ND and 497-1461-5-ND. What’s the difference and which would work for me? Also I need L78M06ABV but it only show up in digikey as L7806ABV, without the M. After using the later part number it gives me 497-19132-ND and 497-1444-5-ND. What’s the difference and which would work for me? ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [August 28, 2020, 7:59pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/2 "2020-08-28T19:59:52Z")
Hello, Please verify specifications of [497-1444-5-ND | 497-1461-5-ND, click here.](https://www.digikey.com/en/products/filter/power-management-pmic/voltage-regulators-linear-low-drop-out-ldo-regulators/699?s=N4IgTCBcDaICwE4DsBaAjHTKCsKByAIgAQA%20RiqGAbGjvgSALoC%20QA) These should be a suitable fit. ---
**Author:** ![hp-je513l](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@hp-je513l](https://forum.digikey.com/u/hp-je513l)\ **Post date:** [August 28, 2020, 8:04pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/3 "2020-08-28T20:04:58Z")
Perfect thank you! ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [August 28, 2020, 8:07pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/4 "2020-08-28T20:07:14Z")
Please see page 3/30 for the ‘‘M’’ difference. [https://www.st.com/content/ccc/resource/sales\_and\_marketing/promotional\_material/selection\_guide/f6/95/21/05/d5/33/44/0c/Selection%20guide.pdf/files/Selection%20guide.pdf/jcr:content/translations/en.Selection%20guide.pdf](https://www.st.com/content/ccc/resource/sales_and_marketing/promotional_material/selection_guide/f6/95/21/05/d5/33/44/0c/Selection%20guide.pdf/files/Selection%20guide.pdf/jcr:content/translations/en.Selection%20guide.pdf) Have a great day! ---
**Author:** ![hp-je513l](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@hp-je513l](https://forum.digikey.com/u/hp-je513l)\ **Post date:** [August 28, 2020, 9:07pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/5 "2020-08-28T21:07:12Z")
Hmm… if I have a L78M06ABV, are you saying the L7806ABV (no M) still works? ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [August 28, 2020, 9:10pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/6 "2020-08-28T21:10:30Z")
I would think it would work, I see slightly higher quiescent current and slightly higher tolerance on the replacement, usually this wouldn’t matter but depending how fussy your design is, it would be best to verify the datasheets however to be sure. Thank you! ---
**Author:** ![hp-je513l](https://avatars.discourse-cdn.com/v4/letter/h/a4c791/32.png) [@hp-je513l](https://forum.digikey.com/u/hp-je513l)\ **Post date:** [August 28, 2020, 9:35pm UTC](https://forum.digikey.com/t/voltage-regulator-part-does-not-match-exactly/8304/7 "2020-08-28T21:35:54Z")
It’s for a climate control module that died in a car. L78M06ABV terminals 1 to 2 read 0.8 Ohms, 1 to 3 = 9.47, 2 to 3 = 8.67. With the leads reversed 1 to 2 = 0.8, 1 to 3 = 9.07, 2 to 3 = 8.22. I thought it was shorted because 1 to 2 was low. But L78M05ABV terminals 1 to 2 read 3.60, 1 to 3 = 12.31, 2 to 3 = 8.67. With the leads reversed 1 to 2 = 3.64, 1 to 3 = 12.03, 2 to 3 = 8.22. I had assumed this one was ok.