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STMicroelectronics L7905CD2T-TR — Analog & Data Acquisition
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RoHS Compliant · Lead-Free EIA-481 Standard
STMicroelectronics / Analog & Data Acquisition

STMicroelectronics L7905CD2T-TR -5V Fixed Negative Regulator

MPN L7905CD2T-TR
Active Spot Stock · 24-48h Dispatch 100% Original Sealed

STMicroelectronics L7905CD2T-TR, fixed -5V negative linear regulator, 1.5A output, 60dB PSRR (120Hz), D2PAK surface-mount package, 0°C~125°C operating temperature.

In Stock: 91 pcs
MOQ: 1 pcs
Logistics: DHL / FedEx DAP (Global Express · 3-7d) Russia & CIS DDP (Door-to-Door Cleared)
Dispatch: Shenzhen / HK
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$1.25 / pc
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100% Original Sealed 45x Microscope QC 30-Day Warranty · COC USD T/T & PI · DAP/DDP
[SPEC] Essential Parameters Snapshot Full Specifications (14)
Package / Case TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
ALT
Facing long factory lead times or allocation on L7905CD2T-TR? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (3)

Full Technical Specifications

14 Parameters
L7905CD2T-TR specifications
Parameter / AttributeSpecification / Value
Output typeFixed
MountingSurface Mount
Voltage - input-35V
Voltage dropout1.4V @ 1A (Typ)
Voltage - output (Min (Fixed))-5V
Output current1.5A
Current - quiescent3 mA
Operating temperature0°C~125°C
PSRR60dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Protection featuresOver Temperature, Short Circuit
Number of regulators1
Output configurationNegative
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for L7905CD2T-TR?

Package: TO-220 / TO-220FP / D2PAK · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 99%
Supply Chain & Allocation Reality:

The 79xx series is the negative rail of every split supply that ever fed an op-amp, an audio stage or an instrument: -5V, -8V, -9V, -12V, -15V, -18V and -24V fixed 1.5A regulators in the same TO-220 body as the 78xx - and with a mirrored pinout that catches one swap per bench per year. The digits choose the voltage, the suffix grade (AC = 2 percent tolerance) chooses precision, and the prefixes (L, MC, KA, LM) are the familiar second-source names. The classic failure this page exists for: treating a 7905 as a misplaced 7805, when it differs in polarity, pin order AND tab potential - three separate ways to smoke a board at once.

Verified Pin-Compatible Replacements (3 verified alternatives)

L7912 STMicroelectronics TO-220
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The Voltage Choice, Same Three Pins

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The same regulator body at -12V: same 1.5A class, same GND / IN / OUT pin order, same input-potential tab - the digits after the 79 are a voltage decision, not a circuit decision.

Negative rails from -5V to -24V across the family; mind the minimum input magnitude the negative side needs beyond dropout.

Compatibility & Drop-In Notes: The repair question for any 79xx swap is the rail it feeds: split op-amp supplies tolerate small moves, reference-derived rails do not. Read the schematic rail before the drawer.
Package & Solder Footprint: Same TO-220 land and pin order as the rest of the negative family.
Shenzhen Warehouse Stock & MOQ: Stocked across the voltage ladder.
Request Volume Quote for L7912 Compare L7905CD2T-TR vs L7912 Spec Matrix
L79xxAC STMicroelectronics TO-220 / TO-220FP / D2PAK
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The 2 Percent Precision Grade

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The tightened-tolerance build of the same regulators: 2 percent output tolerance against the looser commercial grades, in the same pin map and the same power ratings.

Same rails; the grade buys accuracy, not headroom.

Compatibility & Drop-In Notes: Grade substitution rule as everywhere: precision upward is free; dropping from AC into a circuit that calibrated against it shifts the rail by the tolerance difference.
Package & Solder Footprint: TO-220 / insulated TO-220FP / D2PAK options across the family.
Shenzhen Warehouse Stock & MOQ: Stocked; quote the grade the schematic asked for.
Request Volume Quote for L79xxAC Compare L7905CD2T-TR vs L79xxAC Spec Matrix
LM337 TI / STMicroelectronics TO-220 / SOT-223
Functional Equivalent
Availability & Target Pricing:

The Adjustable Route Any Voltage

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The adjustable negative regulator: set any output below the reference with two resistors - the answer when the required rail is not one of the fixed catalogue values (or when the original was already adjustable).

Same negative input culture; the divider replaces the internal fixed reference tap.

Compatibility & Drop-In Notes: Choosing between them is a design-time fact, not a repair-time one: a board built for a fixed 79xx takes the fixed family; an adjustable socket takes the LM337 (or its grade variants).
Package & Solder Footprint: TO-220 with its own pin functions; see the dedicated page.
Shenzhen Warehouse Stock & MOQ: Stocked; the flexible end of the negative family.
Request Volume Quote for LM337 Compare L7905CD2T-TR vs LM337 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The mirror: 7905 is pin 1 GND, pin 2 IN, pin 3 OUT - against 7805 at 1 IN, 2 GND, 3 OUT. Inserted straight across, the negative part connects the input to what the board believes is ground.
  • The tab is live: on the 79xx the heatsink tab sits at input potential (the negative rail), where the 78xx tab is ground. Heatsink isolation and creepage belong to the design review of every swap and mounting.
  • Polarity is the third difference: the 79xx regulates a negative rail. The "7905 for 7805" belief fails on three independent counts - polarity, pin order, tab - which is why it fails so convincingly.
  • The negative family is fussier about input capacitance: the ~2.2uF-class input capacitor is a stability part here, and a repair that leaves it out gets oscillation or a drifting rail that looks like a bad regulator.
  • Read the whole orderable number: digits pick the voltage (05 / 08 / 09 / 12 / 15 / 18 / 24), the AC suffix the 2 percent grade, and the prefix (L / MC / KA / LM) the second source - the pin map is the family constant.
  • Split supplies share the ground reference: impedance between the positive and negative regulators shows up as tracking error between the rails - star-point the reference when a repair touches either side.
Frequently Asked Technical Questions

Q: Can a 7905 replace a 7805?

A: No, on three independent counts: it regulates a negative rail, its pin order is GND / IN / OUT where the 7805 is IN / GND / OUT, and its tab sits at input potential instead of ground. A straight-across swap connects the input to the board ground.

Q: What is the pinout of the L7905?

A: TO-220: pin 1 GND, pin 2 IN, pin 3 OUT, with the tab connected to the input - the mirror image of the 7805 arrangement, and the reason this family is a permanent entry in smoke-story collections.

Q: Which 79xx parts are interchangeable?

A: Inside the family the pins are constant: L / MC / KA / LM prefixes and the AC precision grade interchange, and the digits choose the voltage (-5V through -24V). Across voltages it is a rail decision; across families (fixed vs the adjustable LM337) it is a circuit change.

Technical Details & Description

Fixed -5V negative rail in a D2PAK

The STMicroelectronics L7905CD2T-TR is a fixed -5V negative linear regulator delivering up to 1.5A in a D2PAK surface-mount package. It takes a negative input up to -35V and regulates it down to a clean -5V output with 60dB of ripple rejection at 120Hz — useful for audio preamp rails, op-amp negative supplies, or any bipolar supply where the negative side needs a stable local regulator. The fixed output means no external resistor divider; just input and output caps and it runs.

The 1.5A output current covers a fair amount of local load. The 3 mA quiescent current is typical for a linear regulator of this class.

This is a D2PAK (TO-263) — three leads plus a large exposed tab. The tab is the output (common for negative regulators, the tab carries the output voltage, not ground). For rework: the tab soaks heat, so preheat the board from the bottom or use a hot-air station with a wide nozzle. The tab solder joint is what carries the current and the heat; a cold joint under the tab will show up as dropout under load. Orientation is clear from the tab shape; no ambiguity.

ROHS3 compliant, so it's fine for new designs going through EU markets. The base product number is L7905, meaning this is the surface-mount D2PAK variant of the standard series.

Sourcing this line item

If you're filling a BOM line for a -5V rail and need the D2PAK version, this is the active-production ST part.

Frequently asked questions

What is the output current of L7905CD2T-TR?

The output current rating is 1.5A — enough for a local negative rail feeding multiple op-amps, a small motor bias supply, or the negative side of a split-supply system.

Can I use L7905CD2T-TR as a replacement for L7905CV?

Electrically yes — both are fixed -5V, 1.5A regulators with the same protection features. The difference is package: L7905CD2T-TR is D2PAK surface mount, L7905CV is TO-220 through-hole. The board must be laid out for the D2PAK footprint.

What is L7905CD2T-TR's PSRR?

PSRR is 60dB at 120Hz — that's a 1000:1 reduction of 100/120Hz ripple from a rectified transformer secondary, which keeps hum out of audio and instrumentation rails.

L7905CD2T-TR
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