Diodes Incorporated DDZ7V5CS-7

Overview

DDZ7V5CS-7 from Diodes Incorporated is a surface-mount precision Zener diode with nominal zener voltage 7.45 V (max), ±3% tolerance (7.29–7.67 V), 6 Ω dynamic impedance at 20 mA test current, and 0.5 µA reverse leakage at 6.0 V. It operates in SOD123 package, supports 470 mW power dissipation at +25°C ambient, and serves as voltage reference or overvoltage clamp in low-power analog circuits.

For engineers reviewing the DDZ7V5CS-7 datasheet, DDZ7V5CS-7 pinout, DDZ7V5CS-7 application, or DDZ7V5CS-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (425 °C/W on minimal pad), cathode-band polarity marking, and automotive-grade availability via Q-suffix variants.

Technical Context

This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode. Its tight 3% V_Z tolerance (7.29–7.67 V) and low 6 Ω zener impedance at I_ZT = 20 mA ensure stable regulation under moderate load variation. Temperature coefficient is +0.06%/°C typical in this voltage range, minimizing drift across –65°C to +150°C operating range.

Designed for automated SMT assembly, it uses matte tin–annealed Alloy 42 leadframe and green molding compound (UL 94V-0). Moisture sensitivity level is MSL 1 per J-STD-020, eliminating bake requirements prior to reflow.

Key Specifications

Pinout & Package

DDZ7V5CS-7 is a two-terminal SOD123 surface-mount Zener diode. The cathode is marked by a visible band on the body; the anode is unmarked. No internal circuitry or control logic exists - terminals serve only as bidirectional current path with asymmetric conduction (forward ~0.9 V, reverse breakdown at V_Z).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDZ7V5CS-7, BZX84-C7V5 offers SOT-23 compatibility but sacrifices 2× higher impedance and wider tolerance; MMSZ5235B shares the SOD123 form factor but lacks automotive qualification and delivers inferior regulation accuracy under varying load conditions.

Availability

DDZ7V5CS-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB protection circuits, PLC input stages, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for DDZ7V5CS-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 North America.

This device belongs to the DDZ series of precision Zener diodes engineered for high-accuracy voltage referencing and clamping in space-constrained, thermally demanding applications - especially where automated assembly and environmental compliance are mandatory.

FAQ

What is the maximum continuous reverse power dissipation for DDZ7V5CS-7 at +75°C ambient?

The maximum power dissipation at T_L = +75°C is 500 mW, as specified in the Absolute Maximum Ratings table. This derated value accounts for reduced thermal resistance at elevated lead temperature and allows safe operation in compact enclosures with limited airflow, provided the PCB layout follows Diodes' recommended 1 in² copper pad area.

Does DDZ7V5CS-7 have automotive qualification?

DDZ7V5CS-7 itself is the commercial-grade part. Its automotive-qualified counterpart is DDZ7V5CSQ-7, which is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. The "Q" suffix denotes full automotive change control and traceability - essential for body control modules and infotainment power rails.

How is polarity identified on the DDZ7V5CS-7 package?

Polarity is marked by a distinct cathode band printed on the top surface of the SOD123 body. When viewed from the top with the band on the left, the left terminal is cathode and the right terminal is anode. This matches standard SOD123 orientation per JEDEC MO-203AB and Diodes' package outline drawings.

Can DDZ7V5CS-7 replace a 7.5 V Zener in a feedback loop of a switching regulator?

Yes - its 6 Ω dynamic impedance and tight 3% tolerance make it suitable for secondary-side feedback in isolated DC-DC converters where ±1% output accuracy is acceptable. However, it must be used with appropriate series current-limiting resistor to maintain I_Z ≥ 5 mA and avoid entering the high-impedance knee region below 0.5 mA.