Diodes Incorporated DDZ5V1BQ-7

Overview

DDZ5V1BQ-7 from Diodes Incorporated is a surface-mount precision Zener diode engineered for voltage regulation and reference applications in automotive and industrial circuits. It delivers a tightly controlled zener voltage of 4.94–5.20 V at 20 mA test current, with low dynamic impedance (17 Ω at 1 kHz), <±0.05% typical temperature coefficient, and AEC-Q101 qualification for under-hood power management and sensor biasing.

For engineers reviewing the DDZ5V1BQ-7 datasheet, DDZ5V1BQ-7 pinout, DDZ5V1BQ-7 application, or DDZ5V1BQ-7 equivalent, this device is selected for stable low-voltage reference generation where tight V_Z tolerance, low thermal drift, and automotive-grade reliability are required - especially in 5 V rail monitoring, ADC reference buffering, and overvoltage clamp circuits.

Technical Context

This Zener diode operates in reverse breakdown to maintain a precise DC reference voltage across its terminals. Its SOD123 package enables high-density PCB layouts while supporting automated reflow assembly. The device exhibits minimal voltage variation over temperature (TC ≈ ±0.05%/°C) and maintains stable regulation down to 1 mA zener current.

Designed for use in series-shunt or shunt-regulator topologies, it supports fast transient response due to low junction capacitance (~80 pF at V_R = 1 V) and low thermal resistance (R_θJA = 425 °C/W on minimal pad layout). Its 294 mW derated power dissipation at +25°C ensures robust operation in compact, thermally constrained environments.

Key Specifications

Pinout & Package

DDZ5V1BQ-7 uses the SOD123 surface-mount plastic package with cathode band marking. Terminals consist of anode and cathode leads formed from Alloy 42 leadframe with matte tin annealed finish, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C5V1LT1G and MMSZ5222BT1G, DDZ5V1BQ-7 provides superior voltage accuracy (±2.5% vs. ±5%) and lower temperature drift, making it preferred for automotive sensor interfaces and precision ADC references where calibration overhead must be minimized.

Availability

DDZ5V1BQ-7 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC analog front-ends, and medical sensor modules requiring stable component supply with full AEC-Q101 documentation and traceable lot history.

Supply support for DDZ5V1BQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.

The DDZ series targets precision voltage reference needs in harsh-environment applications, with design emphasis on tight V_Z tolerance, low thermal drift, and AEC-Q101-compliant packaging for under-hood and chassis-mounted electronics.

FAQ

What is the maximum continuous zener current for DDZ5V1BQ-7 at 85°C ambient?

At T_A = +85°C, the derated power dissipation is approximately 180 mW (based on Figure 1 derating curve). With V_Z ≈ 5.1 V, the maximum continuous zener current is ~35 mA. Exceeding this risks thermal runaway or accelerated parametric shift, especially without adequate copper pour.

Can DDZ5V1BQ-7 replace a 5.0 V TL431-based reference in low-power applications?

No - DDZ5V1BQ-7 is a passive two-terminal Zener diode requiring external current limiting, whereas TL431 is an active three-terminal adjustable shunt regulator. For fixed 5.1 V references with <1 mA quiescent current, DDZ5V1BQ-7 is simpler and more cost-effective; for programmable or buffered references, TL431 remains necessary.

Is the cathode band polarity consistent across all SOD123-packaged Diodes Zeners?

Yes - all SOD123 Zeners from Diodes Incorporated, including DDZ5V1BQ-7, mark the cathode with a visible band at the top edge in top-view orientation. This aligns with JEDEC standard SOD-123 pinout: banded end = cathode, opposite end = anode.

Does DDZ5V1BQ-7 require a minimum zener current to maintain specified voltage accuracy?

Yes - the datasheet specifies V_Z and Z_ZT at I_ZT = 20 mA. At I_Z < 5 mA, V_Z drops by up to 50 mV and Z_ZT rises sharply. For stable 5.1 V operation, maintain I_Z ≥ 10 mA using appropriate series resistor calculation based on supply voltage and load current.