Diodes Incorporated DDTA113ZUA-7

Overview

DDTA113ZUA-7 from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = 1 kΩ and R2 = 10 kΩ (R1 ≠ R2), V_CEO = −50 V, I_C(max) = −100 mA, and DC current gain (h_FE) ≥ 33 at I_C = −10 mA, V_CE = −10 V. It serves as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA113ZUA-7 datasheet, DDTA113ZUA-7 pinout, DDTA113ZUA-7 application, or DDTA113ZUA-7 equivalent, key selection criteria include input voltage thresholds (V_IN(on) = −3.0 V @ I_O = −20 mA), output saturation voltage (V_O(on) ≤ −0.3 V), resistor tolerance (±30% on R1), and thermal resistance (R_θJA = 625 °C/W).

Technical Context

This device integrates a PNP bipolar junction transistor with two discrete external-base bias resistors-R1 connected between base and input, R2 between base and emitter-enabling single-resistor logic-level drive without external bias network. Its R1 ≠ R2 configuration provides asymmetric input threshold behavior ideal for TTL-to-CMOS level translation.

Designed for surface-mount operation at ambient temperatures from −55 °C to +150 °C, it delivers stable switching performance up to 250 MHz f_T under V_CE = −10 V, I_E = 5 mA conditions, with guaranteed I_O(off) ≤ −0.5 μA at V_CC = −50 V and V_I = 0 V.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic package (2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm height), RoHS-compliant, moisture sensitivity level 1, weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA123YUA-7 and DDTA143XUA-7, the DDTA113ZUA-7 offers the lowest input resistance (1 kΩ), delivering highest base drive current for fastest turn-on in high-speed digital interfaces, while maintaining identical thermal limits and package compatibility.

Availability

DDTA113ZUA-7 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and consumer IoT power sequencing requiring stable component supply and consistent SOT-323 tape-and-reel delivery.

Supply support for DDTA113ZUA-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, with design and manufacturing operations across Asia and the Americas.

The DDTA series targets cost-sensitive, space-constrained digital interface applications requiring simplified transistor biasing, particularly in automotive, industrial, and portable electronics where reliability and RoHS compliance are mandatory.

FAQ

What is the absolute maximum input voltage for DDTA113ZUA-7?

The absolute maximum input voltage (V_IN) is specified as +5 V to −10 V relative to emitter (pin 1). Exceeding −10 V risks forward-biasing the base-emitter junction beyond its safe limit, potentially causing irreversible degradation. This rating assumes operation within the full −55 °C to +150 °C temperature range and accounts for transient overshoot in real-world digital signal environments.

Can DDTA113ZUA-7 be used as a high-side load switch?

Yes - configured with emitter tied to V_CC, collector driving the load to ground, and input applied to base (pin 2), it functions as a saturated PNP high-side switch. Its −100 mA I_C(max) and ≤ −0.3 V V_O(on) support loads up to ~100 mA at 3.3 V or 5 V rails, provided power dissipation remains below 200 mW under worst-case ambient conditions.

How does the R1 ≠ R2 configuration affect switching behavior?

The unequal resistors create asymmetric input hysteresis: R1 dominates turn-on (low-impedance path to base), while R2 dominates turn-off (higher-impedance discharge path). This yields faster turn-on (t_ON < 100 ns) and slower, more noise-immune turn-off (t_OFF > 200 ns), making it ideal for debouncing digital inputs or suppressing EMI-induced glitches in harsh environments.

Is DDTA113ZUA-7 compatible with lead-free reflow profiles?

Yes - it is RoHS-compliant with matte tin-plated leads and qualified for standard lead-free reflow (J-STD-020C Level 1 moisture sensitivity). The package withstands peak temperatures up to 260 °C for 30 seconds, and its green molding compound meets UL 94V-0 flammability rating, ensuring robustness in automated assembly processes.