Nexperia USA Inc. BZX79-B11,133

Overview

BZX79-B11,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 11 V nominal working voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 85 Ω typical differential resistance. It serves as a precision low-power voltage reference in analog signal conditioning circuits and power supply feedback paths.

For engineers reviewing the BZX79-B11,133 datasheet, BZX79-B11,133 pinout, BZX79-B11,133 application, or BZX79-B11,133 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (380 K/W), reverse leakage (100 nA at 8 V), temperature coefficient (+5.4 to +9.0 mV/K), and non-repetitive surge capability (85 A peak reverse current).

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified current range (1–20 mA). Its low differential resistance (50–150 Ω) ensures stable output under varying load conditions, while its positive temperature coefficient (+5.4 to +9.0 mV/K at I_Z = 5 mA) enables predictable drift compensation in temperature-sensitive references.

The device uses axial-leaded SOD27 packaging with hermetic glass sealing for long-term stability and moisture resistance. Its junction-to-ambient thermal resistance of 380 K/W (lead length ≤8 mm, no PCB metallization pad) defines maximum continuous power derating above 50 °C ambient, and its non-repetitive peak reverse power rating (40 W, 100 μs square wave) supports transient overvoltage clamping in low-energy protection circuits.

Key Specifications

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking. Dimensions: D = 1.85 mm max., L = 25.4 mm min., b = 0.56 mm max. Lead spacing not standardized; intended for through-hole mounting with 8 mm max. lead length for thermal compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240B,215 and BZX84-C11,215, the BZX79-B11,133 offers superior voltage accuracy (±2% vs. ±5%), higher power handling (500 mW vs. ≤350 mW), and lower dynamic impedance-making it the preferred choice for industrial-grade analog references requiring long-term stability and through-hole assembly.

Availability

BZX79-B11,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reference circuits, switch-mode power supply feedback networks, and low-energy overvoltage clamping requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B11,133 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

Nexperia is a global leader in discrete semiconductors, formed in 2017 from the former NXP Standard Products division, with core expertise in high-reliability Zener diodes, logic, and PowerMOS devices.

The BZX79 series belongs to Nexperia's precision voltage regulator diode product line, engineered specifically for stable, low-power voltage referencing in industrial, automotive, and computing applications where long-term parametric consistency is critical.

FAQ

What is the maximum continuous reverse current the BZX79-B11,133 can sustain without damage?

The BZX79-B11,133 has no specified maximum continuous reverse current rating; instead, its safe operating limit is defined by power dissipation. At 25 °C ambient, it supports up to ~45 mA (P = V × I = 11 V × 0.045 A ≈ 500 mW), derating linearly to zero at 150 °C junction temperature per the 380 K/W thermal resistance. Exceeding this causes irreversible thermal runaway.

Can the BZX79-B11,133 be used in series or parallel configurations for higher voltage or current capability?

Series connection is viable for higher reference voltages (e.g., two 11 V diodes yield ~22 V), but requires matched units to avoid current imbalance due to V_Z tolerance. Parallel operation is strongly discouraged-minor V_Z mismatches cause current hogging and thermal failure, as confirmed in Nexperia's application notes on Zener derating.

How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?

At I_Z = 5 mA, the BZX79-B11,133 exhibits +5.4 to +9.0 mV/K drift. Over a 165 K range, this yields +0.89 V to +1.49 V total shift-approximately +8.1% to +13.5% of nominal V_Z. For high-stability applications, this must be compensated via circuit design or selected alongside complementary-coefficient diodes.

Is the SOD27 package RoHS-compliant and lead-free?

Yes-the BZX79-B11,133 manufactured by Nexperia meets RoHS Directive 2011/65/EU and is lead-free. The SOD27 glass body contains no restricted substances, and the axial leads are matte tin-plated copper. Full compliance documentation, including IEC 62474 declaration, is available via Nexperia's product portal under document number 9397 750 09387.