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

NXP Semiconductors PDTA123ES,126

Name: PDTA123ES,126
Brand: NXP Semiconductors
SKU: PDTA123ES,126
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PDTA123ES,126

Manufacturer:: NXP Semiconductors

Category:: Single, Pre-Biased Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: PDTA123ES,126.pdf

Description:: TRANS PREBIAS PNP 50V TO92-3

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Product details

Overview

PDTA123ES,126 from NXP Semiconductors is a PNP resistor-equipped transistor in TO-92 (SOT54) through-hole package, featuring integrated 2.2 kΩ base bias resistors R1 and R2, −50 V V_CEO, −100 mA I_O, and −150 mV V_CEsat at I_C = −10 mA / I_B = −0.5 mA - used for low-power general-purpose switching in discrete logic interfaces and level-shifting circuits.

For engineers reviewing the PDTA123ES,126 datasheet, PDTA123ES,126 pinout, PDTA123ES,126 application, or PDTA123ES,126 equivalent, key selection criteria include its fixed-resistor PNP topology, through-hole SOT54 mechanical compatibility, guaranteed V_CEsat ≤ −150 mV, input-off voltage range of −1.2 V to −0.5 V, and suitability for DC-coupled inverter stages requiring minimal external components.

Technical Context

This device integrates two precision-matched 2.2 kΩ bias resistors (R1 = base-to-emitter, R2 = base-to-collector) to form a single-chip PNP digital transistor with built-in current-limiting and level-shifting capability. It operates as a saturated switch with guaranteed h_FE ≥ 30 at V_CE = −5 V and I_C = −20 mA.

Its −50 V absolute maximum V_CEO and V_CBO, −10 V V_EBO, and thermal resistance R_th(j-a) = 250 K/W (T_amb ≤ 25 °C) define its safe operating area in ambient-temperature-stable through-hole applications where PCB space and assembly cost reduction are prioritized over surface-mount density.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - supports reliable switching in 24 V and lower DC supply rails with margin against transients
I_O (DC)	−100 mA - sufficient drive capability for LED indicators, small relays, and logic-level translators
V_CEsat	≤ −150 mV at I_C = −10 mA / I_B = −0.5 mA - ensures low conduction loss and minimal self-heating during saturation
R1, R2	2.2 kΩ ±30% - factory-trimmed internal bias network eliminates need for external base resistors
h_FE	≥30 at V_CE = −5 V, I_C = −20 mA - guarantees predictable gain for consistent on/off behavior in digital switching
P_tot	500 mW at T_amb ≤ 25 °C - enables continuous operation without heatsinking in standard through-hole layouts

Pinout & Package

Package: Plastic single-ended leaded (through-hole) package; 3 leads - SOT54 (TO-92, SC-43A), body dimensions 4.8 × 4.2 × 14.5 mm (D × E × L), lead pitch 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Input node connected internally to R1 (to emitter) and R2 (to collector); accepts TTL/CMOS-compatible logic levels
2	Collector	High-side switched output; connects to load supply rail (e.g., +V_CC) when used in common-emitter configuration
3	Emitter	Common reference terminal; tied to ground or low-side return path; provides current sink path for driven loads

Key Features

Feature	Design Value
Integrated bias resistors	Eliminates two external SMT or through-hole resistors, reducing BOM count and PCB footprint in discrete logic interfaces
Guaranteed V_CEsat	≤ −150 mV ensures <150 mW dissipation at 10 mA load, enabling thermally stable operation without derating
Input-off voltage window	Vi(off) = −1.2 V to −0.5 V allows robust noise immunity against negative-going glitches in industrial control inputs
Through-hole mechanical reliability	SOT54 package withstands mechanical stress and thermal cycling better than SMT variants in serviceable or high-vibration environments

Applications

LED Driver Circuit	Microcontroller Interface
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins with current limiting. IC Role / Device Role / Timing Role: PNP current sink switch configured in common-emitter mode, turning LED on when GPIO is low. Use Value: Built-in R1/R2 resistors set base current automatically, eliminating external bias components and ensuring consistent LED brightness across production units.	Use Scenario: Level translation between 3.3 V MCU outputs and 5 V or 12 V peripheral enable lines. IC Role / Device Role / Timing Role: Inverting logic buffer with defined VIH/VIL thresholds via internal resistor ratio, providing clean high-to-low signal conversion. Use Value: Vi(on) = −2 V to −1.6 V and Vi(off) = −1.2 V to −0.5 V guarantee >0.5 V noise margin, preventing false triggering in electrically noisy systems.
Relay Coil Driver	Discrete Logic Inverter
Use Scenario: Switching 12 V relay coils drawing up to 80 mA in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Saturated PNP switch controlling coil current path to ground, with flyback diode protection externally added. Use Value: −100 mA I_O rating and 500 mW power dissipation allow continuous coil drive without thermal shutdown under nominal conditions.	Use Scenario: Constructing non-inverting or inverting gates using discrete transistors in legacy analog-digital hybrid circuits. IC Role / Device Role / Timing Role: Core active element in resistor-transistor logic (RTL) or diode-transistor logic (DTL) implementations. Use Value: Matched R1/R2 values ensure predictable input impedance (~1.1 kΩ) and symmetric switching thresholds, simplifying timing analysis in multi-stage logic chains.

LED Driver Circuit

Microcontroller Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins with current limiting.

IC Role / Device Role / Timing Role: PNP current sink switch configured in common-emitter mode, turning LED on when GPIO is low.

Use Value: Built-in R1/R2 resistors set base current automatically, eliminating external bias components and ensuring consistent LED brightness across production units.

Use Scenario: Level translation between 3.3 V MCU outputs and 5 V or 12 V peripheral enable lines.

IC Role / Device Role / Timing Role: Inverting logic buffer with defined VIH/VIL thresholds via internal resistor ratio, providing clean high-to-low signal conversion.

Use Value: Vi(on) = −2 V to −1.6 V and Vi(off) = −1.2 V to −0.5 V guarantee >0.5 V noise margin, preventing false triggering in electrically noisy systems.

Relay Coil Driver

Discrete Logic Inverter

Use Scenario: Switching 12 V relay coils drawing up to 80 mA in industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling coil current path to ground, with flyback diode protection externally added.

Use Value: −100 mA I_O rating and 500 mW power dissipation allow continuous coil drive without thermal shutdown under nominal conditions.

Use Scenario: Constructing non-inverting or inverting gates using discrete transistors in legacy analog-digital hybrid circuits.

IC Role / Device Role / Timing Role: Core active element in resistor-transistor logic (RTL) or diode-transistor logic (DTL) implementations.

Use Value: Matched R1/R2 values ensure predictable input impedance (~1.1 kΩ) and symmetric switching thresholds, simplifying timing analysis in multi-stage logic chains.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PDTC123ES,126	NPN complement with identical R1/R2 values, package, and ratings; polarity reversal required in circuit layout	Used where active-high drive or sourcing (vs sinking) is needed; incompatible in existing PNP-sink designs without schematic change	Select only if NPN logic polarity aligns with system architecture and board layout permits emitter/collector swap
MMBT3906LT1G	Standard PNP BJT without integrated resistors; requires two external 2.2 kΩ base resistors and occupies more PCB area	Offers higher h_FE (up to 300) and tighter V_CEsat spec but increases component count and assembly cost	Choose when design flexibility, gain variability, or replacement availability outweighs BOM simplification benefits of resistor-equipped type

Compared with PDTC123ES,126 and MMBT3906LT1G, PDTA123ES,126 delivers lowest assembly cost and smallest footprint for fixed-gain PNP sinking applications, while avoiding layout redesign (unlike PDTC123ES,126) and eliminating resistor placement risk (unlike MMBT3906LT1G).

Availability

PDTA123ES,126 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface modules, and relay coil drivers requiring stable component supply and long-term obsolescence management.

Supply support for PDTA123ES,126 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PDTA123E series belongs to NXP's resistor-equipped transistor product line, designed specifically to reduce component count and simplify discrete logic interface design in cost-sensitive, medium-volume industrial and consumer electronics.

FAQ

What is the pin configuration of PDTA123ES,126?

PDTA123ES,126 uses SOT54 (TO-92) package with standardized pinout: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter. This configuration is confirmed in the official NXP data sheet section "Simplified outline, symbol and pinning" and applies identically to all PDTA123ES variants including PDTA123ES,126.

Does PDTA123ES,126 require external base resistors?

No, PDTA123ES,126 does not require external base resistors. It integrates two 2.2 kΩ bias resistors (R1 between base and emitter, R2 between base and collector) as part of its monolithic structure. This eliminates the need for discrete base resistors in typical switching applications, directly reducing BOM count and PCB area.

What is the maximum continuous collector current for PDTA123ES,126?

The maximum continuous collector current (I_O) for PDTA123ES,126 is −100 mA, specified under DC conditions per the Absolute Maximum Ratings table. This value is validated across the full operating ambient temperature range and defines the upper limit for reliable steady-state switching without exceeding thermal limits in SOT54 package.

Can PDTA123ES,126 be used in place of a standard PNP transistor like BC807?

PDTA123ES,126 can replace standard PNP transistors such as BC807 only when the circuit relies on internal biasing and does not require adjustable base drive. Its fixed R1/R2 network sets gain and switching thresholds, so direct substitution in BC807-based designs would require removing external base resistors and verifying VIH/VIL compatibility - PDTA123ES,126 is not a drop-in replacement without schematic review.

What is the thermal resistance junction-to-ambient for PDTA123ES,126?

The thermal resistance junction-to-ambient (R_th(j-a)) for PDTA123ES,126 is 250 K/W at T_amb ≤ 25 °C, as specified in the Thermal Characteristics table for the SOT54 package. This value assumes standard mounting conditions on FR4 PCB and determines allowable power dissipation before junction temperature exceeds 150 °C.

PDTA123ES,126 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: PNP - Pre-Biased

Current - Collector (Ic) (Max):: 100 mA

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

Resistor - Base (R1):: 2.2 kOhms

Resistor - Emitter Base (R2):: 2.2 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 20mA, 5V

Vce Saturation (Max) @ Ib, Ic:: 150mV @ 500µA, 10mA

Current - Collector Cutoff (Max):: 1µA

Frequency - Transition:: -

Power - Max:: 500 mW

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

PDTA123ES,126 FAQ

1.How can I place an order for PDTA123ES,126 through Aetrix?

Please submit a Request for Quotation (RFQ) for PDTA123ES,126 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 PDTA123ES,126 reliable?

The price and inventory of PDTA123ES,126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTA123ES,126 is usually 5 days.

3.What payment methods are accepted for PDTA123ES,126?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTA123ES,126 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PDTA123ES,126?

PDTA123ES,126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PDTA123ES,126 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 PDTA123ES,126?

For technical support, including PDTA123ES,126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTA123ES,126 requirements.

6.How does Aetrix verify that PDTA123ES,126 is sourced from the original manufacturer or authorized distributors?

All PDTA123ES,126 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 PDTA123ES,126 meets industry standards.

7.What is the process for return or replacement of PDTA123ES,126?

All PDTA123ES,126 units undergo pre-shipment inspection (PSI). If there is an issue with PDTA123ES,126, 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 PDTA123ES,126 part is unused and in its original packaging.

Return procedure for PDTA123ES,126:

1.Submit a request within 90 days.

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

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