Diodes Incorporated SMAZ9V1-13-F

Overview

SMAZ9V1-13-F from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal zener voltage of 9.1 V (±5%), maximum zener impedance of 4.0 Ω at 50 mA test current, and maximum reverse leakage current of 1.0 µA at 7.0 V. It features SMA package, RoHS-compliant matte tin plating, and is rated for operation from –65 °C to +150 °C - used for voltage regulation and overvoltage protection in DC power rails.

For engineers reviewing the SMAZ9V1-13-F datasheet, SMAZ9V1-13-F pinout, SMAZ9V1-13-F application, or SMAZ9V1-13-F equivalent, key selection criteria include zener voltage tolerance, thermal resistance (R_θJA = 100 °C/W), power derating above +50 °C, and cathode-band polarity marking for automated assembly verification.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 9.1 V nominal regulation is specified at I_ZT = 50 mA, with low dynamic impedance (Z_ZT ≤ 4.0 Ω) ensuring tight voltage control during transient current changes.

The device uses silicon PN junction construction in an SMA molded plastic case (UL 94V-0), with cathode identified by a band. Thermal performance is defined for FR-4 PCB mounting per Diodes Inc. pad layout - junction-to-ambient thermal resistance is 100 °C/W, and power dissipation derates linearly at 10 mW/°C above +50 °C.

Key Specifications

Pinout & Package

Package: SMA (Surface Mount Adapter), molded plastic case with UL 94V-0 flammability rating; dimensions: 4.00–4.60 mm length × 2.29–2.92 mm width × 1.27–1.63 mm height; cathode identified by a visible band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1,115 and 1N4739A, SMAZ9V1-13-F uniquely balances 1.0 W SMT power capability, low 4.0 Ω impedance at 50 mA, and automated-assembly compatibility - making it optimal for high-reliability, medium-current industrial regulators.

Availability

SMAZ9V1-13-F is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, and IoT sensor node voltage reference requiring stable component supply across multi-year production cycles.

Supply support for SMAZ9V1-13-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

This device belongs to the SMAZ series of surface-mount Zener diodes, designed specifically for automated high-volume production of compact, thermally efficient voltage regulation and transient suppression circuits in industrial and automotive environments.

FAQ

What is the maximum reverse voltage (V_R) at which leakage current is guaranteed?

The datasheet specifies maximum reverse leakage current of 1.0 µA at V_R = 7.0 V. This is measured under standard conditions (T_A = +25 °C) and defines the upper bound of off-state conduction before reaching the zener knee. At voltages below 7.0 V, leakage remains well within this limit, supporting low-power standby operation.

Can SMAZ9V1-13-F be used in parallel for higher power dissipation?

No - Zener diodes exhibit negative temperature coefficient and mismatched V_Z tolerances, causing current hogging and thermal runaway when paralleled. For >1.0 W requirements, use a single higher-rated device (e.g., 3.0 W SMAJ series) or active regulation instead of parallel Zeners.

Is the SMA package compatible with standard IPC-7351B land patterns?

Yes - the SMA outline matches IPC-7351B "SMA" footprint (JEDEC DO-214AC). Diodes Incorporated's recommended pad layout (4.80–5.59 mm length, 2.29–2.92 mm width) aligns with IPC Class B density and supports both reflow and wave soldering with proper stencil aperture design.

Does this Zener diode have a specified capacitance value?

No specific capacitance is listed in the datasheet for SMAZ9V1-13-F. However, Figure 2 shows typical total capacitance of ~100 pF at 0 V for SMAZ12 and ~45 pF for SMAZ27 at 1 MHz; extrapolating, SMAZ9V1 likely exhibits ~120–150 pF - sufficient for DC/low-frequency regulation but not RF bypassing.