Diodes Incorporated DDZ36ASF-7

Overview

DDZ36ASF-7 from Diodes Incorporated is a precision 36V Zener diode in SOD323F package, designed for voltage regulation and reference applications with ±2.5% V_Z tolerance (32.14–33.79V @ I_ZT = 5mA), 90Ω max zener impedance, and 0.07µA reverse leakage at 30.5V. It delivers stable 500mW power dissipation on FR-4 PCBs and supports automotive-grade reliability via IATF 16949 manufacturing.

For engineers reviewing the DDZ36ASF-7 datasheet, DDZ36ASF-7 pinout, DDZ36ASF-7 application, or DDZ36ASF-7 equivalent, this part serves as a surface-mount precision voltage reference in power supply feedback loops, overvoltage protection circuits, and analog sensor biasing-where tight V_Z tolerance, low thermal resistance (250°C/W), and AEC-Q200-aligned production are critical selection criteria.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals. Its 36V nominal zener voltage is specified at 5mA test current with temperature coefficient optimized near zero crossing (see Fig. 3), and it exhibits <0.07µA reverse leakage at 30.5V, enabling low-power standby regulation.

The SOD323F package features matte tin–annealed copper alloy leads, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 molded plastic housing. Thermal derating begins above 25°C ambient per Fig. 1, with full 500mW rating only at T_A ≤ 25°C due to R_θJA = 250°C/W.

Key Specifications

Pinout & Package

SOD323F is a two-terminal surface-mount package with cathode identified by a band on the top surface. The device has no internal circuitry beyond the Zener junction; terminal polarity is fixed: anode (unmarked end) and cathode (banded end).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C36LT1G and MMSZ5245B-TP, DDZ36ASF-7 provides tighter V_Z tolerance, superior thermal performance (250°C/W vs ≥300°C/W), and automotive-grade process control-making it preferred for high-accuracy, thermally constrained, or safety-critical applications.

Availability

DDZ36ASF-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, test equipment calibration, and medical sensor biasing requiring stable component supply and long-term lifecycle support.

Supply support for DDZ36ASF-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

The DDZ series targets precision voltage reference needs in space-constrained, high-reliability applications-emphasizing tight V_Z tolerance, low leakage, and automotive-compliant production processes.

FAQ

What is the exact zener voltage range for DDZ36ASF-7 at 25°C?

The DDZ36ASF-7 has a guaranteed zener voltage range of 32.14V to 33.79V when measured at I_ZT = 5mA and T_A = +25°C, per DS31987 Rev. 23–2 page 3. This ±2.5% tolerance is tighter than standard Zeners and reflects binning for precision applications.

Can DDZ36ASF-7 be used in automotive applications?

Yes-DDZ36ASF-7 is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q200, its production controls, traceability, and thermal robustness (−65°C to +150°C) make it suitable for non-safety-critical automotive modules like body control units and infotainment power rails.

What is the maximum allowable power dissipation at 85°C ambient?

Per Fig. 1 in DS31987, the power derating curve shows linear reduction from 500mW at 25°C to 300mW at 85°C ambient. Therefore, maximum continuous dissipation at T_A = 85°C is 300mW-exceeding this risks junction overheating given R_θJA = 250°C/W.

Does DDZ36ASF-7 have a specified temperature coefficient?

No single TC value is listed, but Figure 3 shows typical temperature coefficient vs. V_Z curves. For 36V-class Zeners, TC is approximately +3.5 mV/°C near room temperature-consistent with the positive slope observed for V_Z > 30V devices in the graph, indicating moderate positive drift with temperature.