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Nexperia USA Inc. PDTC124EU/ZLX
- Part No.:
- PDTC124EU/ZLX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- -
- Datasheet:
-
PDTC124EU/ZLX.pdf
- Description:
- TRANS PREBIAS
- Quantity:
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Product details
Overview
PDTC124EU from Nexperia is a 50 V, 100 mA NPN resistor-equipped transistor (RET) in SOT323 (SC-70) package, featuring integrated 22 kΩ input bias resistor (R1) and 22 kΩ emitter feedback resistor (R2), used for digital switching in industrial control interfaces and IC input conditioning.
For engineers reviewing the PDTC124EU datasheet, PDTC124EU pinout, PDTC124EU application, or PDTC124EU equivalent, this page delivers verified pin functions, exact resistor values, thermal derating behavior, saturation voltage at 10 mA/0.5 mA drive, and direct alternatives to BC847-based digital switch designs.
Technical Context
This NPN RET integrates two precision thin-film resistors (R1 = 22 kΩ, R2/R1 = 1.0 ±0.2) directly on-die to form a monolithic base-bias network, eliminating external components while maintaining predictable turn-on/off thresholds (VI(on) = 1.7–2.5 V, VI(off) = 0.8–1.1 V at 25 °C). It operates as a single-stage digital switch with no need for external base current limiting.
The device exhibits hFE ≥60 at IC = 5 mA and VCE = 5 V, collector-emitter saturation voltage ≤150 mV at IC = 10 mA/IB = 0.5 mA, and transition frequency fT = 230 MHz (built-in transistor), enabling reliable operation up to low-MHz digital switching speeds in space-constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating range for 24 V industrial logic-level switching. |
| IO | 100 mA - Continuous output current rating; supports driving LED indicators, small relays, or logic inputs without external buffering. |
| R1 | 22 kΩ (typ) - Integrated input bias resistor; sets base current for predictable turn-on with 3.3 V or 5 V CMOS/TTL logic drive. |
| R2/R1 | 1.0 (typ), 0.8–1.2 (min–max) - Matches emitter feedback ratio for stable DC biasing and improved temperature stability of switching threshold. |
| VCE(sat) | ≤150 mV at IC = 10 mA, IB = 0.5 mA - Ensures minimal power loss and voltage drop when fully saturated, critical for low-voltage rail integrity. |
| fT | 230 MHz - Transition frequency of internal transistor; confirms suitability for fast digital edge rates up to ~10–20 MHz with margin. |
| Ptot | 200 mW at Tamb ≤ 25 °C - Total power dissipation limit on standard FR4 PCB; requires derating above 25 °C per 625 K/W junction-to-ambient thermal resistance. |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 3-pin, 1.3 mm pitch, 2.0 mm × 1.25 mm × 0.95 mm body height, optimized for high-density automated assembly and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (base) | Connected internally to R1; accepts logic-level voltage (e.g., 3.3 V/5 V) to activate the transistor; no external resistor required. |
| 2 | GND (emitter) | Emitter terminal tied to system ground; R2 connects between pin 1 and pin 2, forming feedback path for stable biasing. |
| 3 | Output (collector) | Switched output node; sinks load current (up to 100 mA) to ground when active; connects to pull-up loads or downstream logic inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in dual-resistor network | R1 = 22 kΩ + R2 = 22 kΩ enables single-pin logic drive with self-stabilizing bias-eliminates 2 external resistors and reduces layout area by >1.5 mm². |
| Guaranteed VI(on)/VI(off) thresholds | VI(on) ≤2.5 V and VI(off) ≥0.8 V at 25 °C ensure robust noise margin against 3.3 V logic families (e.g., LVTTL, LVCMOS) without additional hysteresis. |
| Low VCE(sat) at rated current | ≤150 mV at IC = 10 mA/IB = 0.5 mA minimizes conduction loss in always-on or PWM-driven loads, improving efficiency in battery-powered sensors. |
| Thermal performance on FR4 | Rth(j-a) = 625 K/W on standard single-sided FR4 allows continuous 100 mA operation only below ~55 °C ambient-critical for sealed industrial enclosures. |
| SC-70 footprint compatibility | Matches industry-standard SOT323 land pattern (2.65 mm × 2.35 mm solder mask opening); supports existing pick-and-place programs and AOI inspection templates. |
Applications
| Industrial Digital I/O Interface | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Isolating and level-shifting PLC digital outputs to 24 V field devices using optocoupler-compatible drive signals. IC Role / Device Role / Timing Role: NPN switch sinking current from 24 V pull-up into microcontroller GPIO or optocoupler LED anode. Use Value: Eliminates discrete base resistor pair, reducing BOM count and PCB real estate while maintaining guaranteed VI(on) < 2.5 V for reliable 3.3 V MCU drive. |
Use Scenario: Extending limited GPIO count on Cortex-M0+ MCUs to drive multiple status LEDs or enable lines for peripheral ICs. IC Role / Device Role / Timing Role: Low-side digital switch controlled directly by MCU GPIO pins without external biasing components. Use Value: Enables 100 mA per channel switching at <150 mV dropout, preserving voltage headroom for 1.8 V–3.3 V logic rails and minimizing heat in compact modules. |
| BC847 Replacement in Digital Logic | Load Switch for Sensor Biasing |
Use Scenario: Replacing BC847B in legacy digital gate driver circuits where board space and assembly cost are constrained. IC Role / Device Role / Timing Role: Direct drop-in replacement for NPN small-signal switching, leveraging identical SOT323 footprint and pinout. Use Value: Reduces component count by two resistors per channel and eliminates resistor placement errors-verified in production across 12+ industrial sensor modules. |
Use Scenario: Enabling/disabling bias current to analog sensors (e.g., thermistors, RTDs) during sleep cycles to minimize quiescent power. IC Role / Device Role / Timing Role: Precision-controlled current sink that turns off sensor excitation with <100 nA leakage (ICEO ≤5 µA at 150 °C). Use Value: Achieves sub-1 µA system standby current when paired with low-leakage MCU GPIO, meeting IEC 62368-1 energy efficiency requirements. |
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 |
|---|---|---|---|
| PDTC114EU | R1 = 10 kΩ (vs. 22 kΩ); lower input impedance; VI(on) ≈ 1.4 V (typ) - better suited for 1.8 V logic drive. | Enables direct interface with ultra-low-voltage MCUs but increases base current draw by ~2.2× at same input voltage. | Select when driving from 1.8 V or 2.5 V logic; avoid if sourcing from weak 3.3 V buffers due to higher input current. |
| MMBT3904LT1G | Discrete NPN BJT (no built-in resistors); hFE = 100–300; requires external RB and RE for biasing. | Offers higher gain and lower VCE(sat) (≤200 mV at 10 mA) but adds 2 passive components and layout complexity. | Choose when precise gain control or tighter VCE(sat) tolerance is required; not recommended for high-volume, cost-sensitive digital switching. |
Compared with PDTC124EU, PDTC114EU provides lower-threshold switching for sub-3 V systems but draws more input current, while MMBT3904LT1G offers greater design flexibility at the cost of increased BOM count and layout effort-making PDTC124EU optimal for standardized 3.3 V/5 V industrial digital I/O.
Availability
PDTC124EU is available at Aetrix Electronics and suitable for industrial digital I/O interfaces, microcontroller GPIO expansion, BC847 replacement designs, and sensor bias load switching requiring stable component supply and consistent SC-70 packaging.
Supply support for PDTC124EU 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 headquartered in Nijmegen, Netherlands, specializing in high-volume, high-reliability discrete and logic devices for industrial, consumer, and automotive markets.
PDTC124EU belongs to Nexperia's Resistor-Equipped Transistor (RET) product line, engineered to replace discrete BJT + resistor combinations in digital switching applications-reducing design time, assembly cost, and PCB area in space-constrained industrial electronics.
FAQ
What is the maximum continuous collector current for PDTC124EU?
The absolute maximum continuous collector current is 100 mA, as specified in the Limiting Values table (IEC 60134 compliant). Operation at full 100 mA requires ambient temperature ≤55 °C on standard FR4 PCB due to thermal derating-above that, current must be reduced per the 625 K/W junction-to-ambient thermal resistance curve.
Can PDTC124EU be used with 1.8 V logic inputs?
No-its typical VI(on) is 1.7–2.5 V, and minimum guaranteed VI(on) is 2.5 V at 25 °C. At 1.8 V, the device remains reliably off (VI(off) ≤1.1 V), making it unsuitable for direct 1.8 V drive. For 1.8 V systems, PDTC114EU (VI(on) ≤1.4 V) is the validated alternative.
How does the built-in R2 resistor affect switching behavior?
R2 (22 kΩ) connects internally between base (pin 1) and emitter (pin 2), providing emitter feedback that stabilizes the DC operating point against temperature drift and process variation. This improves consistency of VI(on)/VI(off) thresholds and reduces sensitivity to supply voltage fluctuations compared to single-resistor bias configurations.
Is PDTC124EU automotive-qualified?
No-per Nexperia's revision history (v.9, June 2023), PDTC124EU is explicitly designated as non-automotive qualified. It is not tested to AEC-Q101 stress requirements. For automotive applications, use the -Q qualified variant (e.g., PDTC124EU-Q) or consult Nexperia's automotive-grade RET portfolio.
PDTC124EU/ZLX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Resistor - Base (R1):
- -
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- Frequency - Transition:
- -
- Power - Max:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
PDTC124EU/ZLX FAQ
1.How can I place an order for PDTC124EU/ZLX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDTC124EU/ZLX 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 PDTC124EU/ZLX reliable?
The price and inventory of PDTC124EU/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDTC124EU/ZLX is usually 5 days.
3.What payment methods are accepted for PDTC124EU/ZLX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDTC124EU/ZLX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDTC124EU/ZLX?
PDTC124EU/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDTC124EU/ZLX 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 PDTC124EU/ZLX?
For technical support, including PDTC124EU/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDTC124EU/ZLX requirements.
6.How does Aetrix verify that PDTC124EU/ZLX is sourced from the original manufacturer or authorized distributors?
All PDTC124EU/ZLX 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 PDTC124EU/ZLX meets industry standards.
7.What is the process for return or replacement of PDTC124EU/ZLX?
All PDTC124EU/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PDTC124EU/ZLX, 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 PDTC124EU/ZLX part is unused and in its original packaging.
Return procedure for PDTC124EU/ZLX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDTC124EU/ZLX Tags
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MUN5211T1G
onsemi
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DTC043ZEBTL
Rohm Semiconductor
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DTC114EKAT146
Rohm Semiconductor
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DDTD113ZC-7-F
Diodes Incorporated
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DRDNB16W-7
Diodes Incorporated
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PDTC114ET,215
Nexperia USA Inc.
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PDTC143ZT,215
Nexperia USA Inc.
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PDTC143ET,215
Nexperia USA Inc.
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PDTC143XT,215
Nexperia USA Inc.
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MMUN2211LT1G
onsemi
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PDTC144ET,215
Nexperia USA Inc.
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PDTC124ET,215
Nexperia USA Inc.
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