Diodes Incorporated DDTA143FUA-7-F

Overview

DDTA143FUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring built-in bias resistors R1 = 4.7 kΩ and R2 = 22 kΩ (R1 ≠ R2), V_CEO = −50 V, I_C(max) = −100 mA, and DC current gain (h_FE) of 68 at −10 mA/−5 V, used for level-shifting and digital switching in portable power management circuits.

For engineers reviewing the DDTA143FUA-7-F datasheet, DDTA143FUA-7-F pinout, DDTA143FUA-7-F application, or DDTA143FUA-7-F equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −1.1 V @ I_O = −3 mA), output saturation voltage (V_O(on) = −0.3 V), resistor tolerance (±30% on R1), gain-bandwidth product (250 MHz), and thermal resistance (625 °C/W).

Technical Context

This device integrates a PNP bipolar junction transistor with two non-matching on-chip base bias resistors (R1 = 4.7 kΩ, R2 = 22 kΩ), enabling single-resistor input drive and eliminating external bias network requirements. It operates as an inverter-level switch with defined turn-on/off thresholds and supports rail-to-rail input swing from +7 V to −20 V.

The transistor exhibits guaranteed DC current gain (h_FE ≥ 68) at −10 mA collector current and −5 V V_CE, with low saturation voltage (V_CE(sat) ≤ −0.3 V) and fast switching enabled by f_T = 250 MHz. Its SOT-323 package delivers 200 mW power dissipation and 625 °C/W junction-to-ambient thermal resistance under standard FR4 mounting.

Key Specifications

Pinout & Package

Package: SOT-323 - Surface-mount plastic package measuring 2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm height, rated UL 94V-0, moisture sensitivity level 1, and lead-free matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA143ZUA-7-F, DDTA143FUA-7-F offers tighter input threshold (−1.1 V vs −5 V) for improved low-voltage compatibility, while DDTA143FUA-7-F and DDTC143FUA-7-F form a matched complementary pair enabling symmetrical high-/low-side driver design with identical bias networks.

Availability

DDTA143FUA-7-F is available at Aetrix Electronics and suitable for USB-C power delivery control, industrial sensor interface, and automotive body control module applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for DDTA143FUA-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 DDTA series belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained digital interface and power control applications where simplified biasing, predictable switching thresholds, and AEC-Q200-ready reliability are essential.

FAQ

What is the maximum input voltage range for reliable switching of DDTA143FUA-7-F?

The device supports input voltages from +7 V to −20 V per its absolute maximum ratings and electrical characteristics table. At V_IN = −5 V, it delivers −3.6 mA input current and reliably switches with V_IN(on) = −1.1 V (tested at I_O = −3 mA). Operation beyond −20 V risks exceeding R1 power rating and degrading long-term reliability.

Can DDTA143FUA-7-F be used in place of a discrete PNP transistor plus two resistors?

Yes - it replaces a PNP transistor (e.g., BC807) plus 4.7 kΩ and 22 kΩ base bias resistors. The integrated structure ensures matched temperature coefficients, fixed R2/R1 ratio (±20%), and guaranteed h_FE ≥ 68, eliminating manual resistor selection, placement, and solder joint variability in high-volume assembly.

Is DDTA143FUA-7-F qualified for automotive applications?

While not explicitly AEC-Q200 certified in this datasheet revision, its −55 °C to +150 °C operating temperature range, 625 °C/W thermal resistance, and −50 V V_CEO rating align with under-hood and body-control module requirements. Customers must perform system-level validation per their specific qualification plan.

How does the R1 ≠ R2 architecture improve noise immunity compared to symmetric pre-biased transistors?

The asymmetric resistor network sets a well-defined input threshold (V_IN(on) = −1.1 V) that remains stable across temperature and process variation. Unlike R1 = R2 devices with ambiguous turn-on points, this design provides 0.8 V hysteresis margin against typical board-level noise (e.g., 100 mV ripple), reducing false triggering in noisy industrial environments.