Diodes Incorporated DDTA123JUA-7-F

Overview

DDTA123JUA-7-F from Diodes Incorporated is a PNP pre-biased small-signal transistor in SOT-323 package, featuring integrated bias resistors R1 = 2.2 kΩ and R2 = 47 kΩ (R1 ≠ R2), −50 V V_CEO, −100 mA I_C(max), and DC current gain (h_FE) of 80 at −10 mA/−5 V. It serves as a logic-level interface switch in low-power digital control circuits.

For engineers reviewing the DDTA123JUA-7-F datasheet, DDTA123JUA-7-F pinout, DDTA123JUA-7-F application, or DDTA123JUA-7-F equivalent, key selection factors include input voltage thresholds (V_IN(on) = −3.0 V), output saturation voltage (V_O(on) = −0.3 V), resistor tolerance (±30%), gain-bandwidth product (250 MHz), and thermal resistance (625 °C/W).

Technical Context

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

The SOT-323 package supports surface-mount assembly on FR4 PCBs with recommended pad layout AP02001, delivering 200 mW power dissipation and operation across −55 °C to +150 °C. Thermal resistance of 625 °C/W reflects its suitability for thermally constrained consumer and industrial control nodes.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount package (2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm height), RoHS-compliant, moisture sensitivity level 1, UL 94V-0 rated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTA123YUA-7-F and DDTA143XUA-7-F, DDTA123JUA-7-F offers optimal balance of precise −3.0 V activation, low saturation voltage, and wide temperature stability-making it ideal for mixed-voltage MCU interfacing where both noise margin and power efficiency matter.

Availability

DDTA123JUA-7-F is available at Aetrix Electronics and suitable for industrial sensor interface, USB port power control, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for DDTA123JUA-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, consumer, and communications markets with high-reliability, cost-optimized components.

This part belongs to the DDTA R1≠R2 series of pre-biased transistors, designed specifically to simplify digital logic interfacing in space-constrained, low-power embedded systems without external bias components.

FAQ

What is the absolute maximum input voltage for DDTA123JUA-7-F?

The absolute maximum input voltage (V_IN) is specified as +5 V to −12 V at T_A = 25 °C. Exceeding −12 V risks breakdown of the internal R1 resistor or base-emitter junction. Operation above +5 V is not supported and may cause irreversible damage due to forward biasing of the base-collector junction.

Can DDTA123JUA-7-F replace a standard PNP BJT like BC807 in existing designs?

No direct replacement is recommended without circuit review. Unlike BC807, DDTA123JUA-7-F has fixed internal bias resistors (R1 = 2.2 kΩ, R2 = 47 kΩ), so removing external base resistors is required. Its −3.0 V V_IN(on) also differs significantly from BC807's base-emitter threshold (~−0.7 V), necessitating logic-level adaptation.

Is thermal derating required for continuous operation at 85 °C ambient?

Yes. At 85 °C ambient, the allowable power dissipation drops to 130 mW per the derating curve (Fig. 1), calculated as 200 mW × [1 − (85 − 25)/625]. This corresponds to ~−65 mA continuous collector current at V_O(on) = −0.3 V, requiring design margin verification for sustained loads.

Does DDTA123JUA-7-F support bidirectional signal translation?

No. It functions strictly as an active-low unidirectional switch: input applied to Pin 2 controls current flow from Pin 3 (collector) to Pin 1 (emitter). The internal resistor topology prevents reverse current conduction or voltage translation from output to input; it lacks symmetrical clamping or ESD diodes for bidirectional use.