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AZ1117C low dropout regulator connection guide

AZ1117C low dropout regulator (SOT-223 H) connection guide. Wire the regulator for 3.3 V.

SOT-223 H

4 contacts Current package
SOT-223 H2 4 contacts
SOT-89 R 4 contacts
SOT-89 R2 4 contacts
TO-252 D 4 contacts

Diodes Incorporated · Order prefix AZ1117CH.

3.3 V fixed output. Marking: GH16D.

Wire the regulator for 3.3 V

Required

Check the package code and the tab net before soldering. Bypass the input and output close to the part. Use at least 10 µF effective output capacitance and less than 20 Ω ESR.

  • Input
    • CIN.1
    • Current-limited 5.3 V supply
  • Output
    • →
    • COUT.1
    • Meter positive
  • Ground
    • CIN.2
    • COUT.2
    • Supply return
    • Meter common
CIN 10 µF between Input and GroundInputCIN 10 µFGround
COUT 22 µF between Output and GroundOutputCOUT 22 µFGround

Bench checks

  • Verify pin and tab continuity with power off. Do not let a heatsink short the tab to another net.
  • Measure OUT relative to GND. This fixture uses 2 V of headroom; check junction temperature before increasing load.

Diodes DS36676 Rev. 5-2, p. 3, Typical Applications Circuit and note 4. The 2 V headroom follows the 3.3 V example for this bench fixture.

SOT-223 H wiring map

External wiring example · Wire the regulator for 3.3 V

Highlighted contacts are used in the required step or selected circuit. Select a contact to highlight its wiring nets.

SOT-223 H
Marked side, tab above the body and pins 1–3 below, left to right.
Selected pin details

1 · GND

Return · Ground

Reference and return for the fixed regulator. Connect to input and output capacitor returns.

Diodes DS36676 Rev. 5-2, p. 2

Connected nets

Electrical limits · Pin in the reference

  • Ground
    • CIN.2
    • COUT.2
    • Supply return
    • Meter common
    • Via CIN 10 µF to Input · IN (3), CIN.1, Current-limited 5.3 V supply
    • Via COUT 22 µF to Output · OUT (2), OUT (TAB), COUT.1, Meter positive

Models and documents

The second line 816TI5 fits the SOT-223 YWWAXX traceability format (year digit 8, work week 16, assembly code T, batch suffix I5). The format does not identify the decade. The D variants share their electrical assignment, but the short center lead and package drawing options require checking the land pattern.

AZ1117CH-ADJTRG1
Adjustable output. Marking: GH15B.
AZ1117CH-1.2TRG1
1.2 V fixed output. Marking: GH16B.
AZ1117CH-1.5TRG1
1.5 V fixed output. Marking: GH15C.
AZ1117CH-1.8TRG1
1.8 V fixed output. Marking: GH16C.
AZ1117CH-2.5TRG1
2.5 V fixed output. Marking: GH15D.
AZ1117CH-3.3TRG1
3.3 V fixed output. Marking: GH16D.
AZ1117CH-5.0TRG1
5.0 V fixed output. Marking: GH15E.
  • Datasheet for AZ1117C· DS36676 Rev. 5-2; see pp. 2–4 for wiring and pp. 11–12 for order and marking codes.
  • Source register· Original document URLs, revisions and file checksums.