Diodes Incorporated SMAZ27-13

Overview

SMAZ27-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal zener voltage of 27.0V (±5%), 25mA maximum zener test current, 200Ω maximum zener impedance at 15mA, and 0.5µA maximum reverse leakage at 20.5V. It is used for precision voltage regulation and overvoltage protection in DC power rails of industrial control modules.

For engineers reviewing the SMAZ27-13 datasheet, SMAZ27-13 pinout, SMAZ27-13 application, or SMAZ27-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 100°C/W), power derating above +50°C, cathode band polarity marking, and RoHS-compliant matte tin plating for lead-free reflow assembly.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at V_Z = 27.0V ±5% when reverse-biased above its knee voltage. Its 1.0W power rating is specified at T_A = +25°C and derates linearly at 10mW/°C above +50°C on FR-4 PCB per Diodes Inc. layout.

It exhibits low dynamic impedance (Z_ZT ≤ 200Ω @ I_ZT = 15mA) and tight leakage control (I_R ≤ 0.5µA @ V_R = 20.5V), enabling stable regulation under varying load conditions in low-power analog and digital supply monitoring circuits.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode identified by a visible band or notch on the body, weight ≈ 0.064g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C27LT1G and 1N5361B, SMAZ27-13 uniquely balances 1.0W surface-mount capability, industry-standard SMA footprint, and tight 200Ω impedance-making it optimal for automated production of space-constrained industrial power interfaces requiring repeatable 27V regulation.

Availability

SMAZ27-13 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive ECU voltage clamp, and programmable logic supply clamp applications requiring stable component supply across extended production cycles.

Supply support for SMAZ27-13 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, serving industrial, computing, consumer, and automotive markets with high-reliability components.

The SMAZ series belongs to Diodes Inc.'s surface-mount Zener diode product line, engineered specifically for automated assembly into compact, thermally managed power regulation circuits operating from -65°C to +150°C.

FAQ

What is the maximum steady-state power dissipation for SMAZ27-13 at +70°C ambient?

At +70°C ambient, SMAZ27-13 dissipates a maximum of 0.8W. This is calculated using the 10mW/°C derating factor above +50°C: (70 − 50) × 10mW = 200mW reduction from 1.0W base rating, resulting in 800mW absolute maximum under natural convection on standard FR-4 PCB.

How is polarity identified on the SMAZ27-13 package?

Polarity is marked by a distinct cathode band on the body of the SMA package - a visible inked or molded stripe adjacent to the cathode terminal. This aligns with the standard DO-214AC outline and must be oriented toward the higher-potential node during circuit design and placement.

Does SMAZ27-13 meet JEDEC moisture sensitivity level requirements?

Yes, SMAZ27-13 is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH without baking prior to reflow soldering, supporting standard SMT manufacturing flow without special handling.

Can SMAZ27-13 replace SMAZ24-13 in a 24V system without redesign?

No - SMAZ27-13 has a 27V nominal zener voltage versus 24V for SMAZ24-13. Substituting it would raise the clamping threshold by 3V, potentially allowing damaging overvoltage to reach downstream ICs. Circuit analysis and validation are required before any voltage-grade substitution.