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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

Nexperia USA Inc. PDTD123YT-QR

Name: PDTD123YT-QR
Brand: Nexperia USA Inc.
SKU: PDTD123YT-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PDTD123YT-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single, Pre-Biased Bipolar Transistors

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

Datasheet:: PDTD123YT-QR.pdf

Description:: TRANS PREBIAS NPN 50V TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:6,725

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Product details

Overview

PDTD123YT-QR from Nexperia is an AEC-Q101-qualified NPN resistor-equipped transistor (RET) in SOT23 package, integrating 2.2 kΩ input bias resistor (R1) and 10 kΩ feedback resistor (R2), rated for 50 V V_CEO and 500 mA output current, used as a digital load switch in automotive body control modules.

For engineers reviewing the PDTD123YT-QR datasheet, PDTD123YT-QR pinout, PDTD123YT-QR application, or PDTD123YT-QR equivalent, this page delivers verified electrical specs, validated SOT23 terminal mapping, automotive-grade thermal limits, and direct alternatives for BC817-Q replacement in high-reliability digital switching circuits.

Technical Context

This RET integrates two precision bias resistors to eliminate external base drive components, enabling direct logic-level interfacing with microcontrollers. Its R2/R1 ratio of 4.55 ±10% ensures stable saturation under varying temperature conditions from −40 °C to +150 °C.

The device operates as a single-stage digital switch with defined VI(on) (0.5–1.4 V at IC = 20 mA) and VI(off) (0.4–1 V at IC = 100 µA), supporting robust noise immunity in 12 V automotive systems where V_CEsat ≤ 300 mV at IC = 50 mA/IB = 2.5 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum safe collector-emitter voltage before breakdown in open-base configuration
I_O	500 mA - Continuous DC output current capability without derating at T_amb ≤ 25 °C
R1	2.2 kΩ ±30% - Integrated base-input resistor enabling direct 3.3 V/5 V MCU interface
R2/R1	4.55 ±10% - Fixed feedback ratio ensuring predictable h_FE-independent saturation behavior
V_CEsat	≤300 mV at IC = 50 mA, IB = 2.5 mA - Low on-state loss critical for thermally constrained PCB layouts
P_tot	250 mW at T_amb = 25 °C on FR4 - Power dissipation limit defining maximum continuous switching duty cycle
h_FE	≥70 at V_CE = 5 V, IC = 50 mA - Minimum DC current gain guaranteeing reliable turn-on with minimal drive current

Pinout & Package

Supplied in SOT23 (TO-236AB) plastic surface-mount package measuring 2.9 mm × 1.3 mm × 1.0 mm with 1.9 mm lead pitch and standard footprint for reflow/wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
1 (I)	Input (base node)	Internal connection to R1; accepts logic-level voltage directly from MCU GPIO or buffer
2 (GND)	Ground (emitter node)	Emitter tied to system ground; provides return path for bias and load current
3 (O)	Output (collector node)	Switched high-side output connected to load; supports up to 500 mA sink current

Key Features

Feature	Design Value
Built-in R1 + R2 network	Eliminates 2 external resistors, reducing BOM count and PCB area by ≥3 mm² per instance
AEC-Q101 qualification	Validated for automotive underhood applications with full stress testing across −40 °C to +150 °C
±10% R2/R1 tolerance	Ensures consistent saturation behavior across production lots without calibration or trimming
Low V_CEsat	Guarantees <300 mV drop at rated 50 mA drive, minimizing self-heating in dense layouts
Standard SOT23 footprint	Enables drop-in replacement of discrete transistors without PCB redesign or tooling change

Applications

Automotive Body Control

Industrial PLC I/O

Use Scenario: Driving LED status indicators and small solenoids in door modules and lighting controllers.

IC Role / Device Role / Timing Role: Digital load switch interfacing between 3.3 V microcontroller outputs and 12 V loads.

Use Value: Eliminates need for level-shifting circuitry while maintaining AEC-Q101 compliance and <300 mV conduction loss.

Use Scenario: Isolating field-side digital inputs from controller logic in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Input conditioning stage converting 24 V industrial signals to clean 3.3 V logic levels.

Use Value: Reduces component count by replacing discrete BJT + two bias resistors with single qualified RET.

Consumer Appliance Control

Medical Diagnostic Equipment

Use Scenario: Controlling relay coils and fan motors in smart HVAC and washing machine mainboards.

IC Role / Device Role / Timing Role: High-side switching element activated by MCU PWM or on/off signals.

Use Value: Enables direct 5 V logic drive with guaranteed 500 mA capability and thermal margin up to 150 °C junction.

Use Scenario: Enabling/disabling sensor bias rails and signal path switches in portable diagnostic devices.

IC Role / Device Role / Timing Role: Precision-controlled enable switch for low-noise analog front-end subsystems.

Use Value: Provides stable VI(on)/VI(off) thresholds across temperature, ensuring deterministic activation timing in battery-powered operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN resistor-equipped transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40-Q	Discrete NPN BJT requiring external R1/R2; h_FE = 250–630; no integrated resistors	Higher gain but needs 2 extra resistors and layout space; not pre-biased	Select when fine-tuned biasing or higher h_FE is required; avoid if minimizing BOM count is priority
PDTB123YT-Q	PNP complement with identical R1/R2 values and AEC-Q101 rating; V_CEO = 50 V, I_O = 500 mA	Used for high-side switching where emitter connects to supply rail instead of ground	Choose for complementary load switching in H-bridge or dual-rail driver designs

Compared with BC817-40-Q and PDTB123YT-Q, PDTD123YT-QR delivers lowest assembly cost via resistor integration, best thermal predictability due to fixed R2/R1 ratio, and native automotive qualification-making it optimal for volume automotive digital switching where reliability and BOM simplification are jointly prioritized.

Availability

PDTD123YT-QR is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC I/O modules, and consumer appliance motor drivers requiring stable component supply with AEC-Q101 assurance and SOT23 compatibility.

Supply support for PDTD123YT-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 essential efficiency technologies, delivering high-performance, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.

This part belongs to Nexperia's Automotive-Qualified Resistor-Equipped Transistor (RET) product line, engineered specifically to replace discrete BJT + bias resistor combinations in cost-sensitive, space-constrained digital switching applications.

FAQ

What is the maximum ambient temperature for continuous operation at full 500 mA load?

The device supports continuous 500 mA output only at T_amb ≤ 25 °C on standard FR4 PCB per datasheet limiting values. At higher ambient temperatures, derating is required: power dissipation must stay within 250 mW, and junction temperature must remain below 150 °C. For example, at T_amb = 85 °C, maximum sustainable current drops to approximately 220 mA based on R_th(j-a) = 500 K/W.

Can PDTD123YT-QR be used as a linear amplifier?

No-it is designed exclusively for digital switching operation. Its integrated bias network fixes base current relative to collector current, eliminating independent base control needed for linear amplification. The specified h_FE minimum (70) applies only under saturated switching conditions, and V_CEsat is optimized for low-loss on-state, not analog linearity.

Is the marking code %7X traceable to manufacturing lot and date?

Yes-the "%" placeholder represents Nexperia's manufacturing site code, and "7X" encodes week/year and process lot information per internal traceability standards. Full decoding requires Nexperia's proprietary marking guide; Aetrix Electronics provides full traceability documentation including date code, wafer lot, and test report upon request for automotive customers.

Does PDTD123YT-QR support PWM switching above 10 kHz?

Yes-its typical collector capacitance is 7 pF, and V_CEsat settles within nanoseconds, enabling clean switching at frequencies up to 100 kHz in resistive loads. For inductive loads like relays or solenoids, external flyback diode protection is mandatory, and rise/fall times remain sub-100 ns per characterization curves in Figures 1–4.

PDTD123YT-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 - Pre-Biased

Current - Collector (Ic) (Max):: 500 mA

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

Resistor - Base (R1):: 2.2 kOhms

Resistor - Emitter Base (R2):: 10 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 70 @ 50mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 2.5mA, 50mA

Current - Collector Cutoff (Max):: 500nA

Frequency - Transition:: -

Power - Max:: 250 mW

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PDTD123YT-QR FAQ

1.How can I place an order for PDTD123YT-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for PDTD123YT-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 PDTD123YT-QR reliable?

The price and inventory of PDTD123YT-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTD123YT-QR is usually 5 days.

3.What payment methods are accepted for PDTD123YT-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTD123YT-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PDTD123YT-QR?

PDTD123YT-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PDTD123YT-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 PDTD123YT-QR?

For technical support, including PDTD123YT-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTD123YT-QR requirements.

6.How does Aetrix verify that PDTD123YT-QR is sourced from the original manufacturer or authorized distributors?

All PDTD123YT-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 PDTD123YT-QR meets industry standards.

7.What is the process for return or replacement of PDTD123YT-QR?

All PDTD123YT-QR units undergo pre-shipment inspection (PSI). If there is an issue with PDTD123YT-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 PDTD123YT-QR part is unused and in its original packaging.

Return procedure for PDTD123YT-QR:

1.Submit a request within 90 days.

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

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