Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi 2SD1805G-TL-E

Name: 2SD1805G-TL-E
Brand: onsemi
SKU: 2SD1805G-TL-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2SD1805G-TL-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: 2SD1805G-TL-E.pdf

Description:: TRANS NPN 20V 5A TP-FA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,072

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

2SD1805G-TL-E from onsemi is a low-saturation-voltage NPN bipolar power transistor in TP-FA (TO-252) package, rated for 20 V V_CEO, 5 A I_C, and 15 W P_C at T_c=25°C, with V_CE(sat) = 220–500 mV at I_C=3 A/I_B=60 mA. It serves as a high-current switch in lamp drivers, relay drivers, and strobe circuits.

For engineers reviewing the 2SD1805G-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat), h_FE rank G (280–560), fast switching (t_on/t_f ≤ 30/40 ns), TO-252 thermal performance, and Pb-free TP-FA reel packaging.

Technical Context

The 2SD1805G-TL-E is a silicon NPN planar epitaxial transistor optimized for medium-power linear and switching applications. Its design emphasizes low V_CE(sat) and fast turn-on/turn-off times, enabled by high-current gain (h_FE = 280–560 at I_C = 500 mA) and 120 MHz f_T.

It operates within a junction temperature range of –55°C to +150°C and supports pulsed collector current up to 8 A. The device uses a single-die TP-FA (TO-252) leadframe package with exposed drain pad for enhanced thermal conduction and is qualified per JEDEC SC-63 standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum safe collector-emitter voltage under open-base conditions; defines upper rail limit in switching applications.
I_C	5 A - Continuous DC collector current rating; determines maximum load drive capability at T_c = 25°C.
V_CE(sat)	220–500 mV @ I_C=3 A/I_B=60 mA - Low saturation voltage minimizes conduction loss and heat generation in saturated-switch mode.
h_FE Rank	G (280–560) - Guaranteed DC current gain range at I_C=500 mA/V_CE=2 V; enables predictable base drive sizing.
f_T	120 MHz - Gain-bandwidth product confirms suitability for high-speed switching up to ~10–20 MHz practical operation.
t_on/t_f	30 ns / 40 ns - Fast switching transitions reduce switching losses and support efficient PWM control in lamp/strobe drivers.
P_C @ T_c=25°C	15 W - Thermal power dissipation limit with heatsink; defines PCB copper area and thermal interface requirements.

Pinout & Package

Package: TP-FA (TO-252, SC-63), surface-mount, thermally enhanced with exposed collector pad. Dimensions: 7.0 × 5.0 × 2.3 mm (L × W × H), mass = 0.282 g.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires ≥60 mA DC drive for full saturation at 3 A load.
2	Collector	Main current path input; electrically connected to exposed metal pad for thermal and electrical conduction.
3	Emiter	Current return path; tied to system ground or low-side reference in common-emitter configurations.
4	Collector	Second collector connection; paralleled with Pin 2 to reduce bondwire inductance and improve current sharing.

Key Features

Feature	Design Value
Low V_CE(sat)	220–500 mV at 3 A ensures <1.5 W conduction loss, reducing heatsink requirements in 5 A lamp drivers.
Fast switching	30 ns t_on/40 ns t_f enables clean square-wave output in strobe flash timing with minimal overlap loss.
High h_FE rank G	280–560 gain range allows smaller base drive circuitry and lower MCU GPIO current burden.
Thermally robust TP-FA	TO-252 package with exposed collector pad achieves ≤ 3.5°C/W θ_JC, supporting 15 W dissipation at T_c=25°C.

Applications

Lamp Driver	Relay Driver
Use Scenario: Driving high-intensity incandescent or halogen lamps in automotive interior lighting or industrial panel indicators. IC Role / Device Role / Timing Role: NPN power switch operating in saturation mode to sink lamp current to ground. Use Value: Low V_CE(sat) minimizes voltage drop and self-heating, enabling stable 5 A lamp current without forced air cooling.	Use Scenario: Controlling 12 V/24 V electromagnetic relays in PLC I/O modules and HVAC control panels. IC Role / Device Role / Timing Role: High-gain NPN switch interfacing microcontroller GPIO to relay coil. Use Value: h_FE rank G ensures reliable turn-on with ≤10 mA MCU drive, eliminating need for Darlington stages.
Strobe Flash Circuit	Voltage Regulator Pass Element
Use Scenario: High-current pulse switching in photographic strobes or emergency beacon flashers requiring sub-100 ns edge fidelity. IC Role / Device Role / Timing Role: Fast-switching NPN transistor gated by pulse generator to discharge capacitor into flash tube. Use Value: 30 ns t_on/40 ns t_f and low Cob (45 pF) preserve pulse integrity and minimize energy loss during rapid discharge.	Use Scenario: Series pass element in linear voltage regulators delivering up to 5 A at ≤20 V input-to-output differential. IC Role / Device Role / Timing Role: Adjustable current-source transistor biased in active region to regulate output voltage. Use Value: 15 W P_C rating and 150°C T_j allow continuous operation under worst-case dropout and load conditions.

Lamp Driver

Relay Driver

Use Scenario: Driving high-intensity incandescent or halogen lamps in automotive interior lighting or industrial panel indicators.

IC Role / Device Role / Timing Role: NPN power switch operating in saturation mode to sink lamp current to ground.

Use Value: Low V_CE(sat) minimizes voltage drop and self-heating, enabling stable 5 A lamp current without forced air cooling.

Use Scenario: Controlling 12 V/24 V electromagnetic relays in PLC I/O modules and HVAC control panels.

IC Role / Device Role / Timing Role: High-gain NPN switch interfacing microcontroller GPIO to relay coil.

Use Value: h_FE rank G ensures reliable turn-on with ≤10 mA MCU drive, eliminating need for Darlington stages.

Strobe Flash Circuit

Voltage Regulator Pass Element

Use Scenario: High-current pulse switching in photographic strobes or emergency beacon flashers requiring sub-100 ns edge fidelity.

IC Role / Device Role / Timing Role: Fast-switching NPN transistor gated by pulse generator to discharge capacitor into flash tube.

Use Value: 30 ns t_on/40 ns t_f and low Cob (45 pF) preserve pulse integrity and minimize energy loss during rapid discharge.

Use Scenario: Series pass element in linear voltage regulators delivering up to 5 A at ≤20 V input-to-output differential.

IC Role / Device Role / Timing Role: Adjustable current-source transistor biased in active region to regulate output voltage.

Use Value: 15 W P_C rating and 150°C T_j allow continuous operation under worst-case dropout and load conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G-TP	V_CEO = 100 V, I_C = 8 A, V_CE(sat) = 1.5 V @ 4 A - higher voltage rating but higher saturation loss.	Suitable for higher bus voltages (>24 V); less efficient at 12–20 V due to higher V_CE(sat).	Select when V_CEO margin >40 V is required; avoid if low-loss 20 V switching is critical.
2SD2142-Y	V_CEO = 20 V, I_C = 5 A, V_CE(sat) = 250–600 mV, h_FE = 200–400 - similar specs but lower h_FE range and no TP-FA tape/reel option.	Compatible in lamp/relay driver layouts but lacks Pb-free 700 pcs./reel packaging and G-rank consistency.	Use only if TP-FA tape format and guaranteed h_FE ≥280 are not required.

Compared with MJD127G-TP and 2SD2142-Y, the 2SD1805G-TL-E delivers superior efficiency at 20 V systems via its 220–500 mV V_CE(sat), consistent G-rank h_FE, and factory-optimized TP-FA reel packaging - making it preferred for cost-sensitive, high-volume lamp and strobe designs where thermal and drive optimization matter.

Availability

2SD1805G-TL-E is available at Aetrix Electronics and suitable for lamp drivers, relay drivers, strobe flash circuits, and linear regulator pass elements requiring stable component supply, Pb-free compliance, and TO-252 surface-mount reliability.

Supply support for 2SD1805G-TL-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The 2SD1805G-TL-E belongs to onsemi's general-purpose bipolar power transistor family, engineered for high-current, low-saturation switching in space-constrained surface-mount applications such as lighting controls and electromechanical actuation.

FAQ

What is the h_FE range guaranteed for 2SD1805G-TL-E?

The 2SD1805G-TL-E is binned to h_FE Rank G, guaranteeing DC current gain between 280 and 560 at V_CE = 2 V and I_C = 500 mA. This range is confirmed per the ordering information table and electrical characteristics section of the official datasheet (No.2115). The 2SD1805G-TL-E's consistent h_FE simplifies base resistor design across production lots.

Is 2SD1805G-TL-E pin-compatible with 2SD1805F-TL-E?

Yes - both 2SD1805G-TL-E and 2SD1805F-TL-E share identical TP-FA (TO-252) package, pinout (Base/Collector/Emitter/Collector), and absolute maximum ratings. The only difference is h_FE binning: F-rank is 160–320, while G-rank is 280–560. No PCB layout change is needed when upgrading from 2SD1805F-TL-E to 2SD1805G-TL-E.

What is the thermal resistance θ_JA for 2SD1805G-TL-E in standard PCB layout?

The datasheet does not specify θ_JA for 2SD1805G-TL-E; it provides θ_JC = 2.0°C/W (typical) from junction to case (collector pad). For a 1-inch² 2-oz copper pad, typical θ_JA is ~50–60°C/W. Actual θ_JA depends on PCB copper area, layer count, and airflow - users must validate thermal performance using the 2SD1805G-TL-E's 15 W P_C rating at T_c = 25°C.

Does 2SD1805G-TL-E support Pb-free reflow soldering?

Yes - the "-TL-E" suffix denotes Pb-free, RoHS-compliant construction and tape-and-reel packaging (700 pcs./reel). The 2SD1805G-TL-E is qualified for standard SnAgCu reflow profiles per J-STD-020, with peak temperature up to 260°C. Its TP-FA package meets JEDEC moisture sensitivity level MSL-1, eliminating bake requirements prior to assembly.

Can 2SD1805G-TL-E be used in avalanche mode?

No - the 2SD1805G-TL-E is not rated or characterized for repetitive avalanche operation. Its absolute maximum V_CEO = 20 V and V_CB0 = 60 V are non-repetitive stress limits. For inductive load switching, external clamping (e.g., flyback diode) is mandatory to prevent breakdown. The 2SD1805G-TL-E datasheet explicitly warns against exceeding recommended operating conditions to ensure reliability.

2SD1805G-TL-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 60mA, 3A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 280 @ 500mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 120MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TP-FA

2SD1805G-TL-E FAQ

1.How can I place an order for 2SD1805G-TL-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1805G-TL-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2SD1805G-TL-E reliable?

The price and inventory of 2SD1805G-TL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1805G-TL-E is usually 5 days.

3.What payment methods are accepted for 2SD1805G-TL-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1805G-TL-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1805G-TL-E?

2SD1805G-TL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1805G-TL-E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2SD1805G-TL-E?

For technical support, including 2SD1805G-TL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1805G-TL-E requirements.

6.How does Aetrix verify that 2SD1805G-TL-E is sourced from the original manufacturer or authorized distributors?

All 2SD1805G-TL-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2SD1805G-TL-E meets industry standards.

7.What is the process for return or replacement of 2SD1805G-TL-E?

All 2SD1805G-TL-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1805G-TL-E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2SD1805G-TL-E part is unused and in its original packaging.

Return procedure for 2SD1805G-TL-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…