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

Nexperia USA Inc. PMBTA45-QR

Name: PMBTA45-QR
Brand: Nexperia USA Inc.
SKU: PMBTA45-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBTA45-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: PMBTA45-QR.pdf

Description:: TRANS NPN 500V 0.15A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,840

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Product details

Overview

PMBTA45-QR from Nexperia is an NPN high-voltage low-V_CEsat transistor in SOT23 package, rated for 500 V V_CEO, 150 mA I_C, and 65 mV typical V_CEsat at I_C = 50 mA / I_B = 6 mA. It delivers high h_FE (50–100) at 30 mA and is AEC-Q101 qualified for automotive motor management and flyback converters.

For engineers reviewing the PMBTA45-QR datasheet, PMBTA45-QR pinout, PMBTA45-QR application, or PMBTA45-QR equivalent, this page provides verified pin functions, thermal resistance (R_th(j-sp) = 70 K/W), switching timing (t_on = 2780 ns), saturation behavior across temperature, and automotive-grade reliability context - all critical for high-voltage switch design validation.

Technical Context

This device operates as a high-voltage switching transistor with open-base V_CEO = 500 V and peak V_CESM = 500 V under zero-bias conditions. Its low saturation voltage (≤90 mV max at I_C/I_B = 5) enables efficient operation in LED chain drivers and electronic ballasts where conduction loss minimization is essential.

It features robust thermal performance: R_th(j-a) = 417 K/W on FR4 PCB and R_th(j-sp) = 70 K/W to solder point. The f_T = 35 MHz and C_c = 4 pF support fast switching in SMPS topologies up to several hundred kHz without excessive Miller-induced delay.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	500 V - supports direct switching of 380 V AC rectified rails without snubber networks
I_C	150 mA continuous - suitable for driving small solenoids, LED strings, or gate resistors in auxiliary power stages
V_CEsat	65 mV typ. @ I_C=50 mA/I_B=6 mA - reduces conduction loss to <3.25 mW at rated current
h_FE	50–100 @ V_CE=10 V, I_C=30 mA - ensures stable base drive margin across temperature (-55 °C to 150 °C)
t_on	2780 ns - enables reliable operation in 100–300 kHz flyback and buck-derived topologies
R_th(j-sp)	70 K/W - allows direct thermal coupling to PCB copper for improved power handling in space-constrained layouts
f_T	35 MHz - supports clean square-wave switching with minimal rise/fall distortion in gate driver applications

Pinout & Package

SOT23 plastic surface-mounted package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch); 3-terminal configuration optimized for automated placement and reflow soldering on FR4 PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input requiring ~6 mA drive for full saturation at 50 mA collector load
2	Emitter (E)	Reference node for bias network; connected to ground or low-side return path
3	Collector (C)	High-voltage output terminal; handles up to 500 V transient peaks in flyback snubbers

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive motor control and lighting modules per stress test requirements
Low V_CEsat at high I_C	65 mV typical at 50 mA enables >99% efficiency in low-power switching nodes
High h_FE stability	50–100 range maintained from −55 °C to 100 °C per Fig. 3, easing thermal design margining
Peak I_C capability	500 mA single-pulse rating supports inrush current handling in LED startup circuits
Low C_c capacitance	4 pF collector-base capacitance minimizes Miller feedback in high-dV/dt environments

Applications

Electronic Ballasts

LED Chain Drivers

Use Scenario: High-frequency AC lamp ignition in compact fluorescent lamps using resonant topology.

IC Role / Device Role / Timing Role: Main switching transistor controlling resonant tank current during preheat and run phases.

Use Value: 500 V V_CEO withstands lamp open-circuit transients; low V_CEsat reduces heating in thermally constrained lamp bases.

Use Scenario: Constant-current regulation for series-connected white LEDs in signage or architectural lighting.

IC Role / Device Role / Timing Role: Low-side switch modulating current through LED string via PWM or linear dimming.

Use Value: Stable h_FE across ambient temperature ensures consistent current setting without recalibration.

Automotive Motor Management

Flyback Converters

Use Scenario: Driving small DC motors in HVAC actuators or mirror positioning systems.

IC Role / Device Role / Timing Role: High-side or low-side switch enabling bidirectional control via H-bridge complement.

Use Value: AEC-Q101 qualification guarantees operation over −40 °C to +125 °C junction range in engine bay environments.

Use Scenario: Primary-side switch in isolated 5–24 W offline flyback supplies for industrial sensors.

IC Role / Device Role / Timing Role: Energy transfer switch turning on/off at 65–130 kHz to regulate output via optocoupler feedback.

Use Value: 35 MHz f_T and 2700 ns tr ensure minimal overlap loss during switching transitions.

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
ZTX653	V_CEO = 300 V, V_CEsat = 150 mV min @ I_C=100 mA - lower voltage rating, higher saturation drop	Not suitable for 380 V rectified rail switching; limited to ≤250 V DC applications	Select only if system peak voltage remains below 280 V and thermal budget permits higher V_CEsat loss
MPSA44	V_CEO = 400 V, h_FE = 25–100 @ I_C=10 mA - narrower gain range, no AEC-Q101 certification	Lacks automotive qualification; requires external derating for extended temperature operation	Acceptable for industrial non-automotive flyback use where qualification is not mandated

Compared with ZTX653 and MPSA44, PMBTA45-QR uniquely combines 500 V rating, 65 mV V_CEsat, AEC-Q101 compliance, and SOT23 footprint - making it the only option among the three qualified for automotive LED drivers operating directly from rectified mains.

Availability

PMBTA45-QR is available at Aetrix Electronics and suitable for electronic ballasts, LED chain drivers, and automotive motor management requiring stable component supply across production lifecycles.

Supply support for PMBTA45-QR 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 leadership in automotive-qualified components and advanced packaging.

The PMBTA45-QR belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for energy-efficient switching in automotive lighting, industrial power conversion, and telecom infrastructure where voltage robustness and thermal predictability are critical.

FAQ

What is the maximum allowable junction temperature for PMBTA45-QR?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent parametric shift or failure. Derating begins at Tamb = 25 °C, with P_tot reduced by 2.4 mW/°C above 25 °C per Fig. 1's 417 K/W thermal resistance curve.

Does PMBTA45-QR support pulsed operation beyond its DC current rating?

Yes - the peak collector current (I_CM) is rated at 500 mA for single pulses ≤1 ms. This enables short-duration inrush handling in LED startup or relay coil driving, provided duty cycle and average power remain within P_tot = 300 mW limits at the operating ambient temperature.

How does the base-emitter saturation voltage behave across temperature?

V_BEsat ranges from 0.75 V to 0.9 V at I_C = 50 mA / I_B = 5 mA, increasing slightly with temperature per Fig. 6. At −55 °C, V_BEsat ≈ 0.75 V; at 100 °C, it reaches ~0.85 V - requiring minor base drive adjustment in wide-temperature designs.

Is PMBTA45-QR compatible with standard SOT23 reflow profiles?

Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended footprint (Fig. 13) uses 0.6 mm × 0.6 mm solder pads with 0.5 mm spacing; peak temperature must not exceed 260 °C for ≤30 seconds to avoid package delamination or marking degradation.

PMBTA45-QR 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):: 150 mA

Voltage - Collector Emitter Breakdown (Max):: 500 V

Vce Saturation (Max) @ Ib, Ic:: 75mV @ 2mA, 20mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 30mA, 10V

Power - Max:: 300 mW

Frequency - Transition:: 35MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PMBTA45-QR FAQ

1.How can I place an order for PMBTA45-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBTA45-QR 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 PMBTA45-QR reliable?

The price and inventory of PMBTA45-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBTA45-QR is usually 5 days.

3.What payment methods are accepted for PMBTA45-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBTA45-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBTA45-QR?

PMBTA45-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBTA45-QR 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 PMBTA45-QR?

For technical support, including PMBTA45-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBTA45-QR requirements.

6.How does Aetrix verify that PMBTA45-QR is sourced from the original manufacturer or authorized distributors?

All PMBTA45-QR 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 PMBTA45-QR meets industry standards.

7.What is the process for return or replacement of PMBTA45-QR?

All PMBTA45-QR units undergo pre-shipment inspection (PSI). If there is an issue with PMBTA45-QR, 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 PMBTA45-QR part is unused and in its original packaging.

Return procedure for PMBTA45-QR:

1.Submit a request within 90 days.

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

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