Diodes Incorporated BZX84C11W-7

Overview

BZX84C11W-7 from Diodes Incorporated is a 11 V, 200 mW surface-mount Zener diode in SOT-323 package, with nominal zener voltage 11.0 V (min 10.4 V, max 11.6 V at I_ZT = 5 mA), zener impedance 20 Ω at 5 mA, and reverse current ≤0.1 µA at 8.0 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the BZX84C11W-7 datasheet, BZX84C11W-7 pinout, BZX84C11W-7 application, or BZX84C11W-7 equivalent, key selection considerations include zener voltage tolerance (±5.5%), thermal resistance (625 K/W), ultra-small SOT-323 footprint, RoHS-compliant lead-free plating, and temperature coefficient (+5.4 to +9.0 mV/°C).

Technical Context

This device operates as a silicon planar Zener diode optimized for stable voltage clamping and reference generation in ambient temperatures from –65 °C to +125 °C. Its breakdown behavior is characterized by a well-defined knee at I_ZK = 1.0 mA and specified dynamic impedance (Z_ZT = 20 Ω) measured at 1 kHz.

The SOT-323 package enables high-density PCB layout while maintaining thermal performance via FR4 board mounting per recommended pad layout. Polarity is unidirectional with cathode marked; no series resistance or integrated protection is included - it functions as a discrete two-terminal voltage reference element.

Key Specifications

Pinout & Package

SOT-323 package: three-terminal plastic case with anode, cathode, and exposed heat sink pad (non-electrical). Cathode is marked by a band; polarity follows standard diode convention (cathode = banded end).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5242BS-7-F and 1SMA5918BT3G, BZX84C11W-7 offers tighter voltage targeting at 11 V with ultra-compact size and lowest cost for low-power (<20 mA) reference use, though with higher zener impedance and narrower tempco range.

Availability

BZX84C11W-7 is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and low-power sensor biasing requiring stable component supply and consistent parametric performance across production batches.

Supply support for BZX84C11W-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, serving industrial, computing, consumer, and communications markets with high-reliability components.

The BZX84C series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for space-constrained, cost-sensitive applications demanding stable voltage regulation at low currents and full RoHS compliance.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZX84C11W-7 has a nominal zener voltage of 11.0 V with a guaranteed breakdown range of 10.4 V to 11.6 V at test current I_ZT = 5 mA. It does not specify a distinct "maximum reverse voltage" - operation above 11.6 V initiates controlled avalanche conduction, not destructive failure, provided power dissipation remains within 200 mW limits.

Is this diode suitable for use in automotive applications?

Yes, the BZX84C11W-7 operates across –65 °C to +125 °C and meets AEC-Q200 stress test recommendations for passive components when used within its rated power and voltage limits. However, it is not AEC-Q101 qualified as a discrete semiconductor; automotive designs requiring qualification should verify compliance with Tier-1 requirements.

How does the temperature coefficient affect circuit accuracy?

With a specified tempco of +5.4 to +9.0 mV/°C, the zener voltage increases linearly with junction temperature. Over a 50 °C rise, V_Z shifts +270 to +450 mV - a +2.5% to +4.1% change. For precision references, this must be compensated via circuit topology or paired with negative-coefficient elements like thermistors.

Can this part replace a through-hole 1N4740A in an existing design?

No - the 1N4740A is a 10 V, 1 W axial-leaded Zener in DO-41 package. While both regulate near 11 V, BZX84C11W-7 has only 200 mW rating, different thermal behavior, and SOT-323 footprint. Direct replacement requires verifying power derating, PCB layout changes, and thermal management adjustments to avoid overheating.