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

Diodes Incorporated DDTA142JU-7

Name: DDTA142JU-7
Brand: Diodes Incorporated
SKU: DDTA142JU-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTA142JU-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTA142JU-7.pdf

Description:: TRANS PREBIAS PNP 200MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:3,236

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Product details

Overview

DDTA142JU-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT-323 package, featuring integrated 470 Ω (R1) and 10 kΩ (R2) biasing resistors, −50 V V_CBO, −40 V V_CEO, and −0.3 V V_CE(sat) at −5 mA/−0.25 mA. It delivers DC current gain (h_FE) of 100–600 and operates across −55 °C to +150 °C for discrete logic-level switching in space-constrained industrial control modules.

For engineers reviewing the DDTA142JU-7 datasheet, DDTA142JU-7 pinout, DDTA142JU-7 application, or DDTA142JU-7 equivalent, this page provides verified electrical parameters, terminal mapping, real-world use cases in level-shifting and load switching, and validated alternative parts with documented R1/R2 value differences and saturation behavior.

Technical Context

This device implements a monolithic PNP bipolar junction transistor with on-die base-emitter and base-collector bias resistors-R1 = 470 Ω (nominal), R2 = 10 kΩ (nominal)-enabling single-resistor drive interface without external bias network. Its −50 V collector-base breakdown and −40 V collector-emitter breakdown support robust operation in negative-rail signal conditioning.

The transistor achieves −0.3 V saturation voltage at −5 mA collector current and −0.25 mA base current, with f_T = 200 MHz (V_CE = −10 V, I_E = −5 mA), confirming suitability for medium-speed digital switching up to ~50 MHz edge rates in compact DC-DC feedback paths and IO buffering.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−50 V - supports safe operation with up to 50 V reverse bias between collector and base
V_CEO	−40 V - enables reliable switching in −40 V rail systems without breakdown
V_CE(sat)	−0.3 V @ I_C = −5 mA, I_B = −0.25 mA - minimizes conduction loss in high-efficiency low-voltage loads
h_FE	100–600 @ I_C = −1 mA, V_CE = −5 V - ensures stable current amplification across production lots
R1 / R2	470 Ω / 10 kΩ (nominal) - provides fixed base bias ratio for predictable turn-on threshold at −2.0 V input
P_D	200 mW @ T_A = 25 °C - defines maximum continuous power dissipation on standard FR4 PCB
f_T	200 MHz @ V_CE = −10 V, I_E = −5 mA - confirms usable bandwidth for fast digital switching

Pinout & Package

Package: SOT-323 (JEDEC TO-236AB), plastic molded, lead-free matte tin plating over Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Connected to most positive potential in PNP configuration; source of output current
2 (Base)	Base terminal with internal R1/R2 network	Input node tied to R1 (470 Ω) and R2 (10 kΩ); accepts logic-level voltage for direct microcontroller drive
3 (Collector)	Collector terminal	Sinks current from load to negative supply; primary switching node in high-side or inverting configurations

Key Features

Feature	Design Value
Integrated bias resistors	R1 = 470 Ω, R2 = 10 kΩ - eliminates need for two external resistors in standard inverter or switch layouts
Low saturation voltage	V_CE(sat) ≤ −0.3 V - reduces power loss and self-heating in battery-powered load switches
High DC current gain range	h_FE = 100–600 - accommodates wide process variation while maintaining functional margin in feedback circuits
Extended temperature range	−55 °C to +150 °C - supports deployment in automotive engine control units and industrial motor drives

Applications

Logic-Level Inverter

Microcontroller GPIO Driver

Use Scenario: Converting 3.3 V CMOS logic output to inverted −5 V signal for legacy interface compatibility.

IC Role / Device Role / Timing Role: PNP pre-biased transistor acting as active-low level shifter with fixed bias network.

Use Value: Eliminates external resistor network; achieves clean −0.3 V low-state with <10 ns propagation delay due to 200 MHz f_T.

Use Scenario: Driving LED anode or small relay coil from MCU GPIO pin with limited sink capability.

IC Role / Device Role / Timing Role: High-side load switch enabling sourcing current to load when GPIO is low.

Use Value: Delivers −100 mA output with guaranteed V_CE(sat) ≤ −0.3 V, reducing thermal stress vs. discrete BJT + resistor solutions.

Power Rail Monitor

Current-Limited Switch

Use Scenario: Detecting undervoltage condition on −12 V supply by triggering comparator input via emitter-follower output.

IC Role / Device Role / Timing Role: Emitter follower buffer isolating sensitive analog circuitry from rail noise.

Use Value: Maintains stable −11.7 V output under 1 mA load due to low V_CE(sat) and high h_FE consistency.

Use Scenario: Enabling/disabling 5 V peripheral bus with built-in current limiting to prevent fault propagation.

IC Role / Device Role / Timing Role: Current-limited PNP switch using R1/R2 to set base drive and constrain peak I_C.

Use Value: Limits short-circuit current to ≈ −20 mA at −5 V supply, avoiding latch-up in downstream ICs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP pre-biased transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DDTA142TU-7-F	R2 = open (no pull-down resistor); higher h_FE min = 100 vs. same max = 600	Requires external pull-down for defined off-state; better for high-gain analog amplification	Select when precise base bias control is needed and external resistor placement is acceptable
NSV142JUXT5G	R1 = 470 Ω, R2 = 10 kΩ (identical), but V_CEO = −30 V and P_D = 150 mW	Lower voltage rating limits use in −40 V systems; reduced power handling requires derating above 75 °C	Choose only for cost-sensitive consumer designs operating below −30 V with ambient < 85 °C

Compared with DDTA142JU-7, DDTA142TU-7-F offers greater flexibility in bias configuration but adds design overhead, while NSV142JUXT5G matches resistor values but sacrifices 10 V breakdown margin and 50 mW power headroom-critical for industrial reliability.

Availability

DDTA142JU-7 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and medical sensor interface modules requiring stable component supply and long-term obsolescence mitigation support.

Supply support for DDTA142JU-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, communications, and consumer markets since 1960.

This part belongs to Diodes' DDTA/ DDTC pre-biased transistor family, engineered specifically for eliminating external bias components in space-constrained digital interface and power management circuits.

FAQ

Is DDTA142JU-7 still in active production?

No-Diodes Incorporated marked DDTA142JU-7 as obsolete in June 2021 per DS30402 Rev. 7. Aetrix Electronics maintains legacy inventory with full traceability and offers qualified replacements with documented parameter alignment and qualification reports upon request.

What is the exact pin configuration for DDTA142JU-7 in SOT-323?

Pin 1 is Emitter, Pin 2 is Base (with internal R1/R2 connection), and Pin 3 is Collector-confirmed by the official schematic diagram on page 2 of DS30402, matching JEDEC TO-236AB mechanical outline and Diodes' marking code "P82".

Can DDTA142JU-7 replace a standard PNP BJT like MMBT3906?

Yes, but only with circuit modification: DDTA142JU-7 integrates R1 = 470 Ω and R2 = 10 kΩ, so it replaces both the transistor and its two base bias resistors. Direct substitution without removing external resistors will cause incorrect biasing and possible saturation failure.

What does the "JU" suffix indicate in DDTA142JU-7?

The "JU" suffix identifies the specific R1/R2 combination: R1 = 470 Ω (J), R2 = 10 kΩ (U), per Diodes' ordering matrix on page 3 of DS30402. This distinguishes it from DDTA142TU-7 (R2 = open) and DDTA122JU-7 (R1 = 220 Ω).

DDTA142JU-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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:: -

DDTA142JU-7 FAQ

1.How can I place an order for DDTA142JU-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTA142JU-7 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 DDTA142JU-7 reliable?

The price and inventory of DDTA142JU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA142JU-7 is usually 5 days.

3.What payment methods are accepted for DDTA142JU-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA142JU-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTA142JU-7?

DDTA142JU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTA142JU-7 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 DDTA142JU-7?

For technical support, including DDTA142JU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA142JU-7 requirements.

6.How does Aetrix verify that DDTA142JU-7 is sourced from the original manufacturer or authorized distributors?

All DDTA142JU-7 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 DDTA142JU-7 meets industry standards.

7.What is the process for return or replacement of DDTA142JU-7?

All DDTA142JU-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA142JU-7, 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 DDTA142JU-7 part is unused and in its original packaging.

Return procedure for DDTA142JU-7:

1.Submit a request within 90 days.

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

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