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 2SB1205T-TL-EX

Name: 2SB1205T-TL-EX
Brand: onsemi
SKU: 2SB1205T-TL-EX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2SB1205T-TL-EX

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SB1205T-TL-EX.pdf

Description:: TRANS PNP 20V 5A DPAK/TP-FA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:30,800

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

Product details

Overview

2SB1205T-TL-EX from onsemi is a PNP bipolar junction transistor (BJT) optimized for medium-power switching applications, featuring –20 V V_CEO, –5 A I_C, –250 mV typical V_CE(sat) at –3 A/–60 mA, 320 MHz f_T, and SC-63 (TO-252) TP-FA package with 4-pin configuration (dual collector). It is used in flash circuits, relay drivers, and lamp drivers where low saturation voltage and fast switching are critical.

For engineers reviewing the 2SB1205T-TL-EX datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) at high current, h_FE rank classification (T-grade: 200–400 at 500 mA), TO-252 thermal performance, and JEDEC-compliant taping for automated assembly.

Technical Context

This PNP BJT employs FBET and MBIT fabrication processes to achieve low V_CE(sat) and fast switching (t_on = 40 ns, t_f = 10 ns). Its dual-collector TP-FA package enables higher current handling and improved thermal dissipation versus standard 3-pin TO-252 variants.

Designed for DC and pulse operation up to –8 A (I_CP), it supports stable gain (h_FE = 60 min at –4 A) and low leakage (I_CBO ≤ –500 nA), with junction temperature rated to 150°C and storage range from –55°C to +150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–20 V - Maximum safe collector-emitter voltage under open-base conditions; defines blocking capability in relay/lamp driver off-state
I_C	–5 A - Continuous DC collector current; supports sustained load switching without derating at T_c = 25°C
V_CE(sat)	–250 to –500 mV @ –3 A/–60 mA - Low conduction loss enabling high-efficiency power stage design
f_T	320 MHz - Sufficient bandwidth for fast digital switching and PWM-driven loads up to ~100 kHz
h_FE (T-rank)	200–400 @ –500 mA - Tight DC gain binning ensures predictable base drive requirements in production
P_C (T_c=25°C)	10 W - Thermal limit at case temperature; requires heatsinking for continuous –5 A operation
C_ob	60 pF @ –10 V - Output capacitance impacts turn-off speed and EMI in high-frequency switching

Pinout & Package

Package: TP-FA (JEITA/JEDEC SC-63, equivalent to TO-252AA), surface-mount, 4-terminal, lead-free, tape-and-reel (700 pcs./reel). Features dual collector terminals for enhanced current sharing and thermal path optimization.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input; requires –60 mA drive for full saturation at –3 A output
2	Collector	Main high-current output terminal; electrically tied to Pin 4
3	Emitter	Common return path; connected to system ground or negative rail in PNP switch topology
4	Collector	Second collector terminal; parallel connection with Pin 2 reduces effective R_DS(on)-like resistance and improves thermal spreading

Key Features

Feature	Design Value
Low V_CE(sat)	–250 mV typical at –3 A enables <1.5 W conduction loss, reducing heatsink requirements in lamp/relay drivers
Fast switching	t_on/t_f = 40 ns/10 ns supports clean edge transitions in 50–100 kHz PWM circuits without excessive ringing
T-rank h_FE binning	200–400 at 500 mA ensures consistent base resistor selection across production lots for reliable turn-on margin
Dual-collector TP-FA layout	Parallel collector terminals improve current density distribution and reduce localized heating in TO-252 footprint

Applications

Flash Circuit Driver	DC Relay Driver
Use Scenario: High-current pulse discharge for camera flash capacitors requiring rapid turn-on and minimal voltage drop. IC Role / Device Role / Timing Role: Main PNP switch controlling flash tube anode current path; operates in saturated switching mode. Use Value: –250 mV V_CE(sat) preserves >95% of capacitor energy during discharge; 10 ns fall time prevents arcing delay.	Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial control panels with microcontroller GPIO interface. IC Role / Device Role / Timing Role: Level-shifting, current-amplifying switch translating logic-low signal into high-side load activation. Use Value: T-rank h_FE guarantees ≥200 gain at 50 mA base drive, ensuring robust relay coil energization across temperature.
Lamp Driver (Incandescent/Halogen)	Voltage Regulator Pass Element
Use Scenario: Dimmable 12 V automotive interior lighting with PWM-controlled brightness and inrush current limiting. IC Role / Device Role / Timing Role: High-side series pass switch modulated at 200–500 Hz to regulate average lamp power. Use Value: 320 MHz f_T and 40 ns t_on support clean PWM edges; dual collector handles peak inrush >–4 A without saturation collapse.	Use Scenario: Linear post-regulation stage in low-noise 5 V/3.3 V supplies powering analog sensors or RF modules. IC Role / Device Role / Timing Role: Adjustable emitter-follower pass transistor controlled by error amplifier feedback loop. Use Value: Low V_BE(sat) (–1.0 to –1.3 V) minimizes dropout voltage; 150°C T_j rating sustains reliability under thermal stress.

Flash Circuit Driver

DC Relay Driver

Use Scenario: High-current pulse discharge for camera flash capacitors requiring rapid turn-on and minimal voltage drop.

IC Role / Device Role / Timing Role: Main PNP switch controlling flash tube anode current path; operates in saturated switching mode.

Use Value: –250 mV V_CE(sat) preserves >95% of capacitor energy during discharge; 10 ns fall time prevents arcing delay.

Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial control panels with microcontroller GPIO interface.

IC Role / Device Role / Timing Role: Level-shifting, current-amplifying switch translating logic-low signal into high-side load activation.

Use Value: T-rank h_FE guarantees ≥200 gain at 50 mA base drive, ensuring robust relay coil energization across temperature.

Lamp Driver (Incandescent/Halogen)

Voltage Regulator Pass Element

Use Scenario: Dimmable 12 V automotive interior lighting with PWM-controlled brightness and inrush current limiting.

IC Role / Device Role / Timing Role: High-side series pass switch modulated at 200–500 Hz to regulate average lamp power.

Use Value: 320 MHz f_T and 40 ns t_on support clean PWM edges; dual collector handles peak inrush >–4 A without saturation collapse.

Use Scenario: Linear post-regulation stage in low-noise 5 V/3.3 V supplies powering analog sensors or RF modules.

IC Role / Device Role / Timing Role: Adjustable emitter-follower pass transistor controlled by error amplifier feedback loop.

Use Value: Low V_BE(sat) (–1.0 to –1.3 V) minimizes dropout voltage; 150°C T_j rating sustains reliability under thermal stress.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955G	V_CEO = –60 V, I_C = –10 A, V_CE(sat) = –1.2 V @ –5 A - higher voltage rating but significantly higher saturation voltage	Better suited for high-voltage industrial controls; less efficient in low-drop applications like lamp drivers	Select when V_CEO > –40 V is required; avoid if V_CE(sat) < –500 mV is critical
2SB1182T-TL-E	V_CEO = –20 V, I_C = –3 A, V_CE(sat) = –200 mV @ –2 A - lower current rating but slightly lower saturation voltage	Optimized for space-constrained 2–3 A loads; not suitable for 5 A continuous duty	Choose for compact designs with <–3 A load; verify thermal margin at target ambient

Compared with MJD2955G and 2SB1182T-TL-E, the 2SB1205T-TL-EX uniquely balances –5 A current capacity, –250 mV V_CE(sat), and TO-252 thermal performance-making it optimal for cost-sensitive, thermally constrained 12–24 V switching loads where efficiency and footprint matter.

Availability

2SB1205T-TL-EX is available at Aetrix Electronics and suitable for flash circuits, relay drivers, and lamp drivers requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT line integration.

Supply support for 2SB1205T-TL-EX 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, serving automotive, industrial, cloud, and IoT markets with discrete, analog, and power management solutions.

The 2SB1205 series belongs to onsemi's general-purpose PNP BJT portfolio, engineered specifically for high-reliability, medium-current switching in consumer and industrial power interfaces-emphasizing low V_CE(sat), fast response, and robust thermal design in surface-mount packages.

FAQ

What is the package type and lead count of the 2SB1205T-TL-EX?

The 2SB1205T-TL-EX uses the TP-FA package (JEDEC TO-252AA), a 4-terminal surface-mount outline with dual collector pins (Pins 2 and 4), single base (Pin 1), and single emitter (Pin 3). It is supplied in 700-piece tape-and-reel format per the ordering code "TL" marking.

Does the 2SB1205T-TL-EX have a specified h_FE range, and how is it binned?

Yes-the 2SB1205T-TL-EX is T-rank binned with h_FE = 200–400 measured at V_CE = –2 V and I_C = –500 mA. This tight gain range ensures predictable base drive design and consistent switching behavior across production units of the 2SB1205T-TL-EX.

What is the maximum pulsed collector current rating for the 2SB1205T-TL-EX?

The 2SB1205T-TL-EX supports a peak pulsed collector current (I_CP) of –8 A under specified test conditions (single pulse, duty cycle ≤1%, T_c = 25°C). This rating enables short-duration surge handling in flash discharge or motor startup circuits using the 2SB1205T-TL-EX.

Is the 2SB1205T-TL-EX RoHS compliant and lead-free?

Yes-the 2SB1205T-TL-EX is lead-free and RoHS compliant, as confirmed by its "Pb Free" designation in the onsemi ordering information table and compliance with JEDEC standards for the TP-FA package. This applies to all units shipped under the 2SB1205T-TL-EX part number.

How does the dual-collector configuration of the 2SB1205T-TL-EX improve thermal performance?

The dual-collector (Pins 2 and 4) configuration in the 2SB1205T-TL-EX reduces effective current density and spreads heat across two parallel paths, lowering thermal resistance from junction-to-case. This allows higher continuous current (–5 A) within the TO-252 footprint without exceeding the 10 W P_C limit at T_c = 25°C.

2SB1205T-TL-EX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 2SB1205

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

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

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):: 500nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 500mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 320MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK/TP-FA

2SB1205T-TL-EX FAQ

1.How can I place an order for 2SB1205T-TL-EX through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SB1205T-TL-EX 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 2SB1205T-TL-EX reliable?

The price and inventory of 2SB1205T-TL-EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB1205T-TL-EX is usually 5 days.

3.What payment methods are accepted for 2SB1205T-TL-EX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB1205T-TL-EX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SB1205T-TL-EX?

2SB1205T-TL-EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SB1205T-TL-EX 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 2SB1205T-TL-EX?

For technical support, including 2SB1205T-TL-EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB1205T-TL-EX requirements.

6.How does Aetrix verify that 2SB1205T-TL-EX is sourced from the original manufacturer or authorized distributors?

All 2SB1205T-TL-EX 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 2SB1205T-TL-EX meets industry standards.

7.What is the process for return or replacement of 2SB1205T-TL-EX?

All 2SB1205T-TL-EX units undergo pre-shipment inspection (PSI). If there is an issue with 2SB1205T-TL-EX, 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 2SB1205T-TL-EX part is unused and in its original packaging.

Return procedure for 2SB1205T-TL-EX:

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…