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

onsemi 2SD1348T

Name: 2SD1348T
Brand: onsemi
SKU: 2SD1348T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1348T

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2SD1348T.pdf

Description:: TRANS NPN 50V 4A TO-126

Quantity:: RFQ Add To RFQ list

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Inventory:17,800

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Product details

Overview

2SD1348T from SANYO Semiconductor is an NPN epitaxial planar silicon power transistor designed for switching applications in power supplies, relay drivers, lamp drivers, and industrial equipment. It delivers 4 A continuous collector current, 50 V collector-emitter breakdown voltage, and low 0.19 V typical V_CE(sat) at I_C = 2 A / I_B = 100 mA, enabling efficient high-current switching.

For engineers reviewing the 2SD1348T datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-126 package thermal performance, h_FE range (100–560 at I_C = 100 mA), wide ASO, and suitability for DC/low-frequency switching where low saturation voltage and robust SOA are critical.

Technical Context

The 2SD1348T operates as a general-purpose NPN bipolar junction transistor optimized for linear and switching modes. Its FBET and MBIT fabrication processes yield low V_CE(sat), high current gain stability across I_C = 100 mA to 3 A, and a 150 MHz f_T-supporting reliable operation up to several hundred kHz in hard-switched topologies.

It features a rated 10 W collector dissipation at T_c = 25°C, junction temperature limit of 150°C, and guaranteed safe operating area (ASO) under pulsed and DC conditions-enabling use in thermally constrained industrial control circuits without forced cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum sustainable collector-emitter voltage before breakdown in common-emitter configuration.
I_C (continuous)	4 A - Continuous collector current rating defining maximum steady-state load drive capability.
V_CE(sat) (typ)	0.19 V @ I_C=2 A, I_B=100 mA - Low saturation voltage minimizes conduction loss and heat generation in switch-mode operation.
h_FE	100–560 - DC current gain range at V_CE=2 V, supporting stable base drive design across production lots.
f_T	150 MHz - Gain-bandwidth product indicating usable frequency limit for small-signal amplification or fast switching.
P_C @ T_c=25°C	10 W - Maximum power dissipation with case temperature held at 25°C, defining heatsink sizing baseline.
C_ob	25 pF @ V_CB=10 V - Output capacitance affecting switching speed and EMI in turn-off transitions.

Pinout & Package

2SD1348T is housed in a TO-126 plastic package with 3 leads, featuring a metal tab for mechanical mounting and thermal conduction. The package supports PCB through-hole assembly and direct heatsinking via the collector-connected tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitting terminal for majority carriers	Reference node for bias network; connected to ground or low-side return path in common-emitter switches.
2 (Collector)	Current collection terminal	Electrically tied to metal tab; must be isolated from chassis unless circuit design permits common-ground heatsinking.
3 (Base)	Control input for minority carrier injection	Receives current-limited drive signal; requires series resistor to ensure I_B ≤ 100 mA for specified V_CE(sat).

Key Features

Feature	Design Value
Low V_CE(sat)	0.19 V typical at 2 A enables <1.2 W conduction loss per device in 24 V relay driver designs.
Wide ASO	Guaranteed safe operating area supports 6 A pulsed current without secondary breakdown, easing surge handling in lamp ignition.
High h_FE consistency	Four h_FE rank bins (R–U) allow precise base drive optimization across production batches.
TO-126 thermal interface	Metal tab provides direct thermal path to heatsink, achieving ~2.5°C/W junction-to-case resistance in standard mounting.

Applications

Power Supply Switching	Relay Driver Circuit
Use Scenario: Used as main series pass transistor in 24 V, 3 A linear power supply with foldback current limiting. IC Role / Device Role / Timing Role: NPN switching transistor operating in active and saturation regions to regulate output voltage and limit fault current. Use Value: Low 0.19 V V_CE(sat) reduces dropout and thermal load, allowing compact heatsink design while maintaining ±2% regulation under full load.	Use Scenario: Drives 12 V/500 mA electromagnetic relay coil in industrial PLC output module. IC Role / Device Role / Timing Role: High-current saturated switch turning relay on/off under microcontroller GPIO control. Use Value: 4 A I_C rating and wide ASO tolerate relay coil inductive kickback without snubber, simplifying board layout and BOM.
Lamp Driver (Incandescent)	Industrial Equipment Control
Use Scenario: Switches 12 V/35 W automotive headlamp bulb in vehicle lighting control unit. IC Role / Device Role / Timing Role: High-current DC switch managing inrush current during cold filament startup. Use Value: 6 A pulsed I_CP rating handles 10× cold-filament surge current (up to ~30 A peak for 10 ms), preventing premature failure.	Use Scenario: Controls solenoid valve in HVAC system controller with 24 V/2 A load. IC Role / Device Role / Timing Role: Robust power stage transistor interfacing between logic-level MCU and high-power actuator. Use Value: 150°C T_j rating and 10 W P_C support continuous duty cycle in sealed enclosures without active cooling.

Power Supply Switching

Relay Driver Circuit

Use Scenario: Used as main series pass transistor in 24 V, 3 A linear power supply with foldback current limiting.

IC Role / Device Role / Timing Role: NPN switching transistor operating in active and saturation regions to regulate output voltage and limit fault current.

Use Value: Low 0.19 V V_CE(sat) reduces dropout and thermal load, allowing compact heatsink design while maintaining ±2% regulation under full load.

Use Scenario: Drives 12 V/500 mA electromagnetic relay coil in industrial PLC output module.

IC Role / Device Role / Timing Role: High-current saturated switch turning relay on/off under microcontroller GPIO control.

Use Value: 4 A I_C rating and wide ASO tolerate relay coil inductive kickback without snubber, simplifying board layout and BOM.

Lamp Driver (Incandescent)

Industrial Equipment Control

Use Scenario: Switches 12 V/35 W automotive headlamp bulb in vehicle lighting control unit.

IC Role / Device Role / Timing Role: High-current DC switch managing inrush current during cold filament startup.

Use Value: 6 A pulsed I_CP rating handles 10× cold-filament surge current (up to ~30 A peak for 10 ms), preventing premature failure.

Use Scenario: Controls solenoid valve in HVAC system controller with 24 V/2 A load.

IC Role / Device Role / Timing Role: Robust power stage transistor interfacing between logic-level MCU and high-power actuator.

Use Value: 150°C T_j rating and 10 W P_C support continuous duty cycle in sealed enclosures without active cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SD1761	Higher V_CEO (60 V), lower h_FE (60–240), same TO-126 package	Better suited for 48 V bus systems; reduced gain requires higher base drive current	Select when higher voltage margin is needed and base drive capability allows increased I_B.
MJD127	Same V_CEO (50 V), higher I_C (8 A), TO-220 package, no metal tab isolation	Requires larger PCB footprint and insulated mounting hardware; superior thermal capacity for sustained >4 A loads	Choose for higher current or improved thermal management where TO-220 layout is acceptable.

Compared with 2SD1348T, 2SD1761 offers greater voltage headroom but demands more base drive, while MJD127 provides double the current rating and better thermal derating at the cost of larger size and non-isolated tab-making 2SD1348T optimal for space-constrained 24–36 V industrial switching where its low V_CE(sat) and proven ASO deliver best-in-class efficiency and reliability.

Availability

2SD1348T is available at Aetrix Electronics and suitable for power supplies, relay drivers, lamp drivers, and industrial equipment requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for 2SD1348T 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

SANYO Semiconductor Co., Ltd. was a Japanese semiconductor manufacturer specializing in analog, power, and discrete devices before its acquisition by ON Semiconductor in 2011; its legacy products remain widely deployed in industrial and automotive systems.

The 2SD1348T belongs to SANYO's general-purpose power transistor family engineered for robust DC and low-frequency switching in cost-sensitive industrial controls, where thermal stability, SOA integrity, and process consistency are prioritized over RF or ultra-high-speed performance.

FAQ

What is the maximum continuous collector current rating for the 2SD1348T?

The 2SD1348T has a maximum continuous collector current (I_C) rating of 4 A at T_a = 25°C. This rating assumes adequate heatsinking and derates linearly with increasing ambient or case temperature per the PC–Ta and PC–Tc curves in the datasheet. At T_c = 25°C, it supports up to 10 W dissipation, enabling sustained 4 A operation only when the case is actively maintained near 25°C.

Does the 2SD1348T have a built-in base-emitter resistor?

No, the 2SD1348T is a standard three-terminal NPN bipolar transistor with no integrated base-emitter resistor. External base drive circuitry-including current-limiting resistors and optional pull-down resistors-must be provided by the designer to ensure proper turn-on/turn-off behavior and avoid latch-up or thermal runaway.

What is the typical V_CE(sat) of the 2SD1348T under standard test conditions?

The typical collector-emitter saturation voltage (V_CE(sat)) of the 2SD1348T is 0.19 V when tested at I_C = 2 A and I_B = 100 mA under pulse conditions. The maximum specified value is 0.5 V under the same conditions, ensuring predictable conduction loss across all units within the R–U h_FE bins.

Can the 2SD1348T be used in place of the 2SB986 in complementary pair designs?

Yes-the 2SD1348T is the NPN complement to the PNP 2SB986, sharing identical absolute maximum ratings, package (TO-126), pinout (E-C-B), and thermal characteristics. Their matched parameters-including V_CEO/V_CBO, I_C, P_C, and f_T-enable symmetrical push-pull or complementary emitter-follower configurations in audio and power amplifier outputs.

Is the metal tab of the 2SD1348T electrically connected to any internal terminal?

Yes, the metal tab on the 2SD1348T is internally connected to the collector terminal. This requires electrical isolation from the heatsink or chassis unless the collector node is referenced to system ground. Insulating pads or shoulder washers must be used when mounting to conductive surfaces to prevent short circuits.

2SD1348T Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 100mA, 2A

Current - Collector Cutoff (Max):: 1mA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 100mA, 2V

Power - Max:: 1.2 W

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126

2SD1348T FAQ

1.How can I place an order for 2SD1348T through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1348T 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 2SD1348T reliable?

The price and inventory of 2SD1348T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1348T is usually 5 days.

3.What payment methods are accepted for 2SD1348T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1348T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1348T?

2SD1348T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1348T 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 2SD1348T?

For technical support, including 2SD1348T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1348T requirements.

6.How does Aetrix verify that 2SD1348T is sourced from the original manufacturer or authorized distributors?

All 2SD1348T 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 2SD1348T meets industry standards.

7.What is the process for return or replacement of 2SD1348T?

All 2SD1348T units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1348T, 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 2SD1348T part is unused and in its original packaging.

Return procedure for 2SD1348T:

1.Submit a request within 90 days.

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

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