Nexperia USA Inc. TDZ12J,115

Overview

TDZ12J,115 from Nexperia is a single Zener diode in SOD323F (SC-90) package, designed for precision voltage regulation and overvoltage protection in low-power circuits. It delivers a nominal Zener voltage of 12 V (11.8–12.2 V at I_Z = 5 mA), differential resistance of 150 Ω, temperature coefficient of +6.0 to +10 mV/K, and total power dissipation up to 500 mW at T_amb ≤ 25 °C - used in automotive body control modules for ECU reference rail stabilization.

For engineers reviewing the TDZ12J,115 datasheet, TDZ12J,115 pinout, TDZ12J,115 application, or TDZ12J,115 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_th(j-sp) = 25 K/W), AEC-Q101 qualification, non-repetitive surge capability (2.5 A peak reverse current), and SOD323F footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z tolerance (±2% at 12 V) and low dynamic impedance (150 Ω typical at 5 mA), enabling stable shunt regulation under varying load conditions. Its positive temperature coefficient (+6.0 to +10 mV/K) supports predictable drift behavior in ambient temperature ranges from −55 °C to +150 °C.

The device is qualified per AEC-Q101 for automotive use and features a thermal resistance from junction to solder point of 25 K/W when mounted on FR4 PCB with 16 mm² cathode pad - critical for transient power handling during ESD or load-dump events without thermal runaway.

Key Specifications

Pinout & Package

SOD323F (SC-90) surface-mount plastic package: 2-pin, ultra-compact (2.7 × 1.6 mm), flat lead, cathode marked by bar on top surface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with BZX384-B12,115 and MMSZ4687T1G, TDZ12J,115 offers tighter V_Z tolerance (±2% vs. ±5%), lower dynamic impedance (150 Ω vs. ≥200 Ω), superior thermal performance (25 K/W vs. ≥30 K/W), and mandatory AEC-Q101 compliance - making it the only choice for automotive 12 V rail stabilization where long-term parametric stability and surge resilience are design-critical.

Availability

TDZ12J,115 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, USB-C power delivery protection, and smart lighting driver reference circuits requiring stable component supply, consistent parametric performance, and AEC-Q101-compliant sourcing.

Supply support for TDZ12J,115 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

The TDZxJ series targets automotive and industrial voltage regulation applications, delivering AEC-Q101-qualified Zener diodes in ultra-small SOD323F packages for space-constrained, thermally demanding environments.

FAQ

What is the maximum continuous forward current rating for TDZ12J,115?

The absolute maximum forward current (I_F) is 250 mA per the datasheet Limiting Values table. However, sustained forward conduction is not its intended operation mode - the device is optimized for reverse-bias Zener regulation, and forward voltage is specified only for verification (V_F ≤ 1.1 V at 100 mA). Continuous forward bias above 10 mA risks accelerated degradation.

Does TDZ12J,115 require heatsinking for 500 mW operation?

No external heatsink is required. At 500 mW dissipation and T_amb = 25 °C, the junction temperature rise is calculated as ΔT = P × R_th(j-a) = 0.5 W × 250 K/W = 125 K, resulting in T_j = 150 °C - the absolute maximum rated value. Operation at full 500 mW is only safe at ambient ≤ 25 °C; derating is mandatory above that temperature per the thermal characteristics curve.

How does the +6.0 to +10 mV/K temperature coefficient impact circuit design?

This positive coefficient means V_Z increases linearly with junction temperature - e.g., a 50 °C rise causes +300 to +500 mV shift. In precision references, this must be compensated via resistor networks or matched-component topologies. In overvoltage protection, it provides inherent margin expansion at elevated temperatures, improving safety during thermal stress.

Can TDZ12J,115 replace TDZ12A in existing designs?

No - TDZ12A uses SOD123 package (3.7 × 1.6 mm) with different thermal resistance (R_th(j-a) ≈ 300 K/W) and higher Zener voltage tolerance (±5%). The SOD323F footprint, tighter ±2% V_Z, and lower R_th(j-sp) (25 K/W) of TDZ12J,115 require layout and thermal validation; direct substitution may cause solder joint stress or insufficient surge margin due to package size and thermal path differences.