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

Diodes Incorporated DDTB122JC-7-F

Name: DDTB122JC-7-F
Brand: Diodes Incorporated
SKU: DDTB122JC-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTB122JC-7-F

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

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

Datasheet:: DDTB122JC-7-F.pdf

Description:: TRANS PREBIAS PNP 50V SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,679

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Product details

Overview

DDTB122JC-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package, featuring integrated 220 Ω and 4.7 kΩ bias resistors, −50 V collector-base breakdown voltage, −40 V collector-emitter breakdown voltage, and −0.3 V saturation voltage at −50 mA. It serves as an input-stage switch or level translator in low-voltage logic interface circuits.

For engineers reviewing the DDTB122JC-7-F datasheet, DDTB122JC-7-F pinout, DDTB122JC-7-F application, or DDTB122JC-7-F equivalent, key selection criteria include verified R1/R2 resistor values, guaranteed V_CE(sat) under −50 mA load, confirmed SOT23 mechanical compatibility, and documented AEC-Q101 suitability for automotive signal conditioning.

Technical Context

This device integrates two precision thin-film resistors (R1 = 220 Ω, R2 = 4.7 kΩ) directly on the die to configure base biasing for predictable turn-on/turn-off thresholds. Its PNP topology enables active-low switching with emitter-connected supply rail and collector-driven load.

The transistor operates within −55 °C to +150 °C, supports −500 mA absolute maximum output current, and delivers DC current gain (h_FE) of 47 at −50 mA collector current - validated per DS30385 Rev. 10–2 electrical test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
R1 (Nominal)	220 Ω - sets base current path for defined turn-on threshold
R2 (Nominal)	4.7 kΩ - provides stable base-emitter shunt for noise immunity and leakage suppression
V_CE(sat)	−0.3 V @ −50 mA - ensures minimal power loss and thermal rise in saturated switching
BV_CEO	−40 V - defines maximum allowable collector-to-emitter reverse voltage in cutoff
h_FE	47 @ −50 mA - guarantees minimum current amplification for reliable drive capability
P_D	200 mW - limits continuous power dissipation on standard FR4 PCB with recommended pad layout
f_T	200 MHz - supports high-speed digital switching up to ~10–20 MHz practical edge rates

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3 terminals, 0.008 g mass, UL 94V-0 rated molding compound, and matte tin-plated leads compliant with MIL-STD-202 solderability requirements.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal	Connected to positive supply rail in PNP common-emitter configuration
2 (Base)	Bias control node	Internally tied to R1 and R2; accepts logic-level input for switching control
3 (Collector)	Current sink terminal	Drives load to ground; output voltage swings between V_CC and near-V_EE

Key Features

Feature	Design Value
Integrated bias network	Factory-trimmed R1 = 220 Ω and R2 = 4.7 kΩ eliminate external resistor placement and tolerance stack-up
SOT23 footprint	Standardized 3-pin outline (2.9 mm × 1.3 mm × 1.0 mm) enables automated pick-and-place and reflow compatibility
Lead-free & green construction	Halogen- and antimony-free molding compound (<900 ppm Br+Cl, <1000 ppm Sb) meets RoHS 3 and IATF 16949 requirements
Automotive-grade qualification	Qualified to AEC-Q101 with PPAP support and manufactured in IATF 16949 certified facilities

Applications

Industrial Sensor Interface

Automotive Door Module

Use Scenario: Converting open-collector sensor outputs (e.g., Hall effect switches) to clean CMOS-compatible signals.

IC Role / Device Role / Timing Role: Level-shifting PNP switch translating −12 V sensor pulses to 3.3 V microcontroller inputs.

Use Value: Eliminates discrete resistor bias network, reduces BOM count by two components, and improves signal integrity via matched internal R1/R2.

Use Scenario: Driving LED status indicators and small solenoids in door latch assemblies.

IC Role / Device Role / Timing Role: Low-side driver for 5 V-tolerant indicator loads with fast turn-off enabled by R2 pull-down.

Use Value: Achieves <1 μs turn-off delay due to 4.7 kΩ base shunt, meeting automotive response timing requirements.

Consumer Appliance Control

Power Supply Enable Circuit

Use Scenario: Enabling/disabling auxiliary rails (e.g., 5 V standby) based on microcontroller GPIO state.

IC Role / Device Role / Timing Role: Active-low enable switch controlling PMOS gate drive in buck converter sequencing.

Use Value: Guaranteed −0.3 V V_CE(sat) ensures <15 mW conduction loss at 50 mA, minimizing thermal impact in sealed enclosures.

Use Scenario: Isolating enable signals between isolated domains in AC/DC adapters.

IC Role / Device Role / Timing Role: Signal-level translator providing galvanic separation between primary-side controller and secondary-side feedback.

Use Value: −40 V BV_CEO withstands transient coupling across Y-capacitors without latch-up or degradation.

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
DDTB113ZC-7-F	R1 = 1 kΩ, R2 = 10 kΩ; higher input impedance, lower base current drive	Better suited for high-impedance MCU GPIOs with weak drive strength	Select when input signal sourcing capability is limited to <1 mA
DDTB123YC-7-F	R1 = 2.2 kΩ, R2 = 10 kΩ; intermediate bias ratio, h_FE = 56	Optimized for 3.3 V logic systems requiring tighter V_IL/V_IH margins	Choose for improved noise margin in noisy industrial environments

Compared with DDTB122JC-7-F, DDTB113ZC-7-F offers higher input impedance but reduced switching speed, while DDTB123YC-7-F trades lower saturation voltage for greater noise immunity - making DDTB122JC-7-F optimal for high-current, low-loss 5 V interface applications.

Availability

DDTB122JC-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive door modules, consumer appliance controls, and power supply enable circuits requiring stable component supply despite its obsolete status through controlled legacy inventory channels.

Supply support for DDTB122JC-7-F 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DDTB series targets cost-sensitive, space-constrained applications requiring integrated biasing - specifically engineered for automotive signal conditioning, industrial I/O, and consumer logic interfacing where reliability and AEC-Q101 compliance are mandatory.

FAQ

Is DDTB122JC-7-F still in active production?

No - DDTB122JC-7-F is marked "Obsolete" in Diodes' official ordering information. However, Aetrix Electronics maintains limited legacy stock with full traceability and provides last-time-buy support, including batch documentation and extended warranty coverage for qualified industrial and automotive programs.

What is the exact marking code on the SOT23 package?

The top-side marking for DDTB122JC-7-F is "P64", followed by a two-character date code (e.g., "L2" for December 2022). This matches Diodes' standardized SOT23 marking scheme per DS30385 Rev. 10–2, and is verified on physical units and official package drawings.

Can DDTB122JC-7-F replace a standard PNP transistor like MMBT3906?

Yes - with circuit redesign. Unlike MMBT3906, DDTB122JC-7-F includes built-in 220 Ω and 4.7 kΩ bias resistors, so external base resistors must be removed. The pinout (Emitter-Base-Collector) matches SOT23-standard orientation, and V_CE(sat) (−0.3 V) is lower than MMBT3906's typical −0.4 V, improving efficiency.

Does this part meet AEC-Q101 requirements?

Yes - Diodes explicitly states that DDTB-series parts intended for automotive use are qualified to AEC-Q101, PPAP-capable, and manufactured in IATF 16949 certified facilities. This is confirmed in the "Features" section of DS30385 Rev. 10–2 and on Diodes' quality portal.

DDTB122JC-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP - Pre-Biased

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

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

Resistor - Base (R1):: 220 Ohms

Resistor - Emitter Base (R2):: 4.7 kOhms

DC Current Gain (hFE) (Min) @ Ic, Vce:: 47 @ 50mA, 5V

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

Current - Collector Cutoff (Max):: 500nA

Frequency - Transition:: 200 MHz

Power - Max:: 200 mW

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

DDTB122JC-7-F FAQ

1.How can I place an order for DDTB122JC-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTB122JC-7-F 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 DDTB122JC-7-F reliable?

The price and inventory of DDTB122JC-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTB122JC-7-F is usually 5 days.

3.What payment methods are accepted for DDTB122JC-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTB122JC-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTB122JC-7-F?

DDTB122JC-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTB122JC-7-F 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 DDTB122JC-7-F?

For technical support, including DDTB122JC-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTB122JC-7-F requirements.

6.How does Aetrix verify that DDTB122JC-7-F is sourced from the original manufacturer or authorized distributors?

All DDTB122JC-7-F 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 DDTB122JC-7-F meets industry standards.

7.What is the process for return or replacement of DDTB122JC-7-F?

All DDTB122JC-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTB122JC-7-F, 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 DDTB122JC-7-F part is unused and in its original packaging.

Return procedure for DDTB122JC-7-F:

1.Submit a request within 90 days.

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

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