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

Nexperia USA Inc. PMBTA44,215

Name: PMBTA44,215
Brand: Nexperia USA Inc.
SKU: PMBTA44,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBTA44,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PMBTA44,215.pdf

Description:: TRANS NPN 400V 0.3A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PMBTA44 from Nexperia is a discrete NPN high-voltage bipolar junction transistor in SOT23 package, designed for switching applications requiring 400 V V_CEO, 300 mA I_C, and low 750 mV V_CEsat at I_C/I_B = 10. It serves as a high-voltage switch in LED chain drivers and SMPS primary-side control stages.

For engineers reviewing the PMBTA44 datasheet, PMBTA44 pinout, PMBTA44 application, or PMBTA44 equivalent, key selection criteria include verified V_CEO = 400 V, guaranteed h_FE ≥ 50 at 10 mA, SOT23 thermal resistance of 500 K/W on FR4, and confirmed low-saturation performance under pulsed 50 mA/5 mA drive.

Technical Context

This NPN transistor operates with open-base collector-emitter breakdown voltage rated at 400 V and supports continuous collector current up to 300 mA. Its DC current gain ranges from 50 to 200 at V_CE = 10 V and I_C = 10 mA, with reduced gain (≥40) maintained at 100 mA under pulsed conditions.

V_CEsat is specified at ≤750 mV with I_C = 50 mA and I_B = 5 mA, confirming low conduction loss in switching duty. Transition frequency f_T reaches 20 MHz at V_CE = 10 V and I_C = 10 mA, supporting moderate-speed digital and analog switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Maximum safe collector-emitter voltage with base open; enables use in 380 V AC rectified rails and HID lamp ballasts.
I_C	300 mA - Continuous collector current rating; sufficient for driving LED strings up to 200 mA with margin.
V_CEsat	750 mV @ I_C/I_B = 10 - Low saturation voltage reduces power dissipation to ≤37.5 mW at 50 mA, easing thermal design.
h_FE	50–200 @ V_CE = 10 V, I_C = 10 mA - Wide DC gain range allows flexible base drive design without active current regulation.
R_th(j-a)	500 K/W on FR4 PCB - Junction-to-ambient thermal resistance defines maximum allowable power dissipation (250 mW at T_amb ≤ 25 °C).
f_T	20 MHz @ V_CE = 10 V, I_C = 10 mA - Supports switching frequencies up to ~1–2 MHz in non-resonant SMPS topologies.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, standard footprint per Fig. 10 and Fig. 11.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires ≥1 mA drive to saturate at 50 mA collector load, enabling direct MCU GPIO interfacing.
2	Emitter (E)	Current return path; internally connected to package tab in SOT23 - no thermal pad; must be routed to ground plane for stability.
3	Collector (C)	High-voltage output node; rated for 400 V blocking; connects to LED anode or SMPS transformer primary.

Key Features

Feature	Design Value
High-voltage capability	400 V V_CEO rating enables direct interface with 277 V AC lighting circuits and 380 V DC bus lines.
Low saturation voltage	V_CEsat ≤ 750 mV at I_C = 50 mA ensures <1% efficiency loss in LED driver series-switch configuration.
Wide DC current gain	h_FE = 50–200 allows single-resistor base biasing across temperature and production spread without feedback.
SOT23 thermal performance	500 K/W R_th(j-a) on FR4 permits 250 mW dissipation at 25 °C ambient - adequate for intermittent 300 mA pulses.

Applications

LED Chain Driver

LCD Backlighting

Use Scenario: Driving 12–24 V LED chains in signage modules with constant-current regulation via external sense resistor.

IC Role / Device Role / Timing Role: High-side NPN switch controlling current flow through LED string; operated in saturation for minimal dropout.

Use Value: 400 V V_CEO headroom prevents breakdown during inductive flyback from long traces; 750 mV V_CEsat limits heat rise to <10 °C on 2-layer FR4.

Use Scenario: Sequential backlight dimming in industrial LCD panels using PWM-controlled current sink topology.

IC Role / Device Role / Timing Role: Low-side switching element modulating current through CCFL or white LED array at 1–20 kHz.

Use Value: 20 MHz f_T ensures clean PWM edge response; h_FE ≥ 50 guarantees full saturation even at -40 °C ambient.

HID Front Lighting

SMPS Primary Switch

Use Scenario: Ignition pulse generation and steady-state current control in automotive-grade HID headlamp ballasts.

IC Role / Device Role / Timing Role: Fast-switching NPN transistor handling 350 V transient spikes during arc initiation.

Use Value: 500 V V_CBO and 150 °C T_j rating support reliable operation in thermally constrained headlamp housings.

Use Scenario: Low-power offline flyback converter (<5 W) for auxiliary supplies in industrial controllers and IoT gateways.

IC Role / Device Role / Timing Role: Self-oscillating or controller-driven primary-side switch in discontinuous conduction mode.

Use Value: 300 mA I_C and 400 V V_CEO accommodate 230 V AC input with safety margin; SOT23 footprint eases layout in space-constrained designs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC846B,215	V_CEO = 65 V, I_C = 100 mA, h_FE = 200–450 - lower voltage/current, higher gain.	Not suitable for >100 V applications; limited to low-voltage logic-level switching and signal amplification.	Select only when operating below 60 V and requiring tighter h_FE tolerance; not drop-in for PMBTA44's 400 V role.
MMBT5401-7-F	V_CEO = 150 V, I_C = 200 mA, V_CEsat = 500 mV @ 10 mA - medium-voltage, lower saturation but insufficient for 400 V rails.	Applicable in telecom hook-switch and mid-range SMPS, but fails 400 V isolation requirement in HID or 277 V AC systems.	Choose where 150 V rating suffices and lower V_CEsat at light loads is prioritized; verify creepage/clearance for HV compliance.

Compared with BC846B,215 and MMBT5401-7-F, PMBTA44 uniquely delivers 400 V blocking with 300 mA current capacity in SOT23 - essential for mains-connected lighting and industrial power interfaces where alternatives require derating or redesign.

Availability

PMBTA44 is available at Aetrix Electronics and suitable for LED chain driver modules, LCD backlight inverters, and low-power SMPS designs requiring stable component supply, consistent parametric performance, and long-term SOT23 footprint compatibility.

Supply support for PMBTA44 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.

The PMBTA44 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for cost-sensitive, thermally constrained switching applications in lighting, power conversion, and telecom infrastructure.

FAQ

Is PMBTA44 suitable for automotive applications?

No. The datasheet explicitly states this device is non-automotive qualified and lacks AEC-Q101 certification. It is not tested to automotive temperature, reliability, or qualification standards. For automotive use, Nexperia offers Q-qualified variants such as PMBTA44-Q, which must be selected separately and verified against vehicle-specific requirements.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 100 mA (single pulse, t_p ≤ 1 ms), but continuous base current must be limited by thermal constraints. With typical h_FE ≥ 50, 6 mA base current supports 300 mA collector current; sustained I_B > 10 mA risks exceeding P_tot = 250 mW on FR4, especially above 50 °C ambient.

Does PMBTA44 have a built-in ESD protection diode?

No. The datasheet does not specify any integrated ESD protection structure. The device exhibits standard bipolar junction behavior with V_EBO = 6 V and ICBO leakage <100 nA at 25 °C - users must implement external TVS or RC snubbers in high-noise environments like SMPS or telecom line interfaces.

Can PMBTA44 replace BCW66 in existing designs?

Only with circuit validation. BCW66 has V_CEO = 60 V and I_C = 800 mA in SOT323 - higher current but far lower voltage rating. Substituting PMBTA44 introduces 400 V capability but reduces max current by 62.5%; layout, drive strength, and thermal margins must be re-evaluated, especially in high-duty-cycle switching.

PMBTA44,215 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 300 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 10mA, 10V

Power - Max:: 250 mW

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMBTA44,215 FAQ

1.How can I place an order for PMBTA44,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBTA44,215 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 PMBTA44,215 reliable?

The price and inventory of PMBTA44,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBTA44,215 is usually 5 days.

3.What payment methods are accepted for PMBTA44,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBTA44,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBTA44,215?

PMBTA44,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBTA44,215 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 PMBTA44,215?

For technical support, including PMBTA44,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBTA44,215 requirements.

6.How does Aetrix verify that PMBTA44,215 is sourced from the original manufacturer or authorized distributors?

All PMBTA44,215 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 PMBTA44,215 meets industry standards.

7.What is the process for return or replacement of PMBTA44,215?

All PMBTA44,215 units undergo pre-shipment inspection (PSI). If there is an issue with PMBTA44,215, 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 PMBTA44,215 part is unused and in its original packaging.

Return procedure for PMBTA44,215:

1.Submit a request within 90 days.

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

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