Diodes Incorporated DDTA124EKA-7-F

Overview

DDTA124EKA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SC-59 package with integrated bias resistors R1 = R2 = 22 kΩ, −40 V V_IN rating, −30 mA I_O output current, and 200 mW power dissipation, used for level-shifting and digital switching in low-power logic interfaces.

For engineers reviewing the DDTA124EKA-7-F datasheet, DDTA124EKA-7-F pinout, DDTA124EKA-7-F application, or DDTA124EKA-7-F equivalent, key selection factors include verified input voltage range (−40 V), guaranteed DC current gain (G_L = 56 min at V_O = −5 V, I_O = −5 mA), and SC-59 thermal resistance (R_θJA = 625 °C/W on FR4).

Technical Context

This device implements a single PNP bipolar junction transistor with monolithically integrated base-emitter and base-collector bias resistors (R1 = R2 = 22 kΩ ±30%), enabling direct logic-level drive without external biasing. It operates as an inverting switch with defined V_IN(on) (−1.9 to −3 V) and V_O(on) (−0.1 to −0.3 V) under specified load conditions.

The transistor supports rail-to-rail input swing up to −40 V relative to emitter, delivers −5 mA output current with G_L ≥ 56, and maintains stable operation across −55 °C to +150 °C ambient temperature, validated per J-STD-020C Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: SC-59 surface-mount plastic package (0.008 g), UL 94V-0 rated, lead-free matte tin plating, moisture sensitivity Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA124EKA-7-F, DDTA124ECA-7-F trades thermal margin for size reduction, while NSVD2101PT3G offers extended voltage range at the cost of gain consistency and threshold precision-making the original optimal for cost-sensitive, thermally stable logic interface designs.

Availability

DDTA124EKA-7-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and consumer appliance control boards requiring stable component supply and long-term manufacturing continuity.

Supply support for DDTA124EKA-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, serving industrial, computing, communications, and consumer markets with high-reliability components.

This part belongs to the DDTA R1 = R2 series of pre-biased transistors, designed specifically to simplify digital interface design by integrating matched bias resistors into standard SMT packages for plug-and-play logic translation.

FAQ

What is the maximum safe operating voltage for DDTA124EKA-7-F?

The absolute maximum input voltage (V_IN) is −40 V, and the maximum supply voltage (V_CC) is −50 V. Operation beyond −40 V at the input pin risks exceeding the internal R1/R2 power rating and may cause irreversible resistor drift or open-circuit failure. Derating is required above 25 °C ambient per the 625 °C/W thermal resistance.

Can DDTA124EKA-7-F replace a standard PNP transistor like BC807-25?

No-it cannot directly replace a bare PNP transistor because its base is internally connected to two 22 kΩ resistors (R1 to collector, R2 to emitter). Using it without accounting for this network will result in incorrect biasing. It replaces both the transistor and its two external bias resistors-not the transistor alone.

Is the 22 kΩ resistor value exact across production lots?

No-the datasheet specifies ±30% tolerance on R1, and R2/R1 ratio is 0.8–1.2. Measured R1 values range from 15.4 kΩ to 28.6 kΩ. Designs relying on precise threshold voltage must accommodate this variation; typical V_IN(on) spans −1.9 V to −3 V under load.

Does DDTA124EKA-7-F support PWM switching at 10 kHz?

Yes-its f_T is 250 MHz (transistor-only, not including resistor effects), and typical switching times (t_ON/t_OFF) are sub-microsecond under −5 mA load. At 10 kHz, duty-cycle fidelity is maintained; however, output rise/fall edges may slow slightly due to RC time constants formed by internal resistors and load capacitance.