My Inquiry
My Account
Nexperia USA Inc. BZX79-B51,113
- Part No.:
- BZX79-B51,113
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B51,113.pdf
- Description:
- DIODE ZENER 51V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX79-B51,113 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 51 V breakdown voltage at 5 mA test current, 90 Ω typical differential resistance, and −3.5 to +0.4 mV/K temperature coefficient. It operates as a low-power precision voltage reference in biasing, regulation, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient and housed in hermetically sealed SOD27 (DO-35) glass package.
For engineers reviewing the BZX79-B51,113 datasheet, BZX79-B51,113 pinout, BZX79-B51,113 application, or BZX79-B51,113 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient stability across operating current, reverse leakage at specified VR, and thermal resistance in PCB-mounted configuration.
Technical Context
This device functions as a two-terminal passive voltage reference relying on controlled reverse-biased Zener breakdown. Its regulation performance is defined by test current (IZ = 5 mA), differential resistance (rdif = 90 Ω typ.), and temperature coefficient (SZ = −3.5 to +0.4 mV/K), which varies nonlinearly with IZ and junction temperature.
The SOD27 package imposes thermal constraints: Rth j-a = 380 K/W (lead length max., no copper pad), limiting sustained power handling; non-repetitive surge capability is 40 W for 100 μs pulses, with peak reverse current IZSM = 0.4 A under those conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 50.0 V to 52.0 V at IZ = 5 mA - defines stable regulation point with ±2% tolerance |
| Differential Resistance (rdif) | 90 Ω typical at IZ = 5 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | −3.5 to +0.4 mV/K at IZ = 5 mA - quantifies VZ drift vs. junction temperature |
| Reverse Leakage (IR) | 50 nA max. at VR = 0.7 × VZnom (35.7 V) - sets minimum bias current for stable operation |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - maximum continuous DC power before thermal derating applies |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - surge rating for transient overvoltage clamping |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a band. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to lower potential node; conducts forward current up to 250 mA |
| Cathode | Zener regulation terminal / high-side connection | Marked with band; reverse-biased to maintain regulated voltage across load |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation accuracy than ±5% BZX79-C series, reducing need for trimming in reference designs |
| Low differential resistance (90 Ω typ.) | Minimizes output voltage variation under changing load current, improving regulation linearity |
| Controlled temperature coefficient range | Supports predictable VZ drift behavior across −65 °C to +200 °C junction range for stable biasing |
| Hermetic SOD27 glass package | Provides long-term reliability and moisture resistance in industrial environments without conformal coating |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 51 V reference for feedback loop of isolated DC-DC converter. IC Role / Device Role / Timing Role: Passive voltage reference establishing precise output setpoint via optocoupler feedback network. Use Value: ±2% VZ tolerance and 90 Ω rdif ensure <±0.5% output regulation error across line/load/temperature. | Use Scenario: Clamping transient surges on 48 V telecom power rail during hot-swap events. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy when rail exceeds 51 V threshold. Use Value: 40 W non-repetitive peak power rating handles 100 μs transients without degradation. |
| Sensor Biasing Circuit | Industrial Analog Input Protection |
Use Scenario: Supplying stable excitation voltage to 500 Ω RTD bridge in temperature transmitter. IC Role / Device Role / Timing Role: Low-noise, low-drift Zener source replacing active reference IC where cost and simplicity are critical. Use Value: SZ range (−3.5 to +0.4 mV/K) allows compensation design for <50 ppm/°C total drift in bridge output. | Use Scenario: Protecting 16-bit ADC input against ESD and overvoltage in programmable logic controller module. IC Role / Device Role / Timing Role: Front-end clamp limiting input to 51 V while maintaining low leakage (<50 nA) to avoid signal offset. Use Value: 50 nA IR at 35.7 V ensures <1 μV offset error in 1 MΩ input impedance path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | 51 V nominal, ±5% tolerance, 17 Ω rdif, higher leakage (1 μA @ 38.3 V) | Lower precision, higher stability under varying current due to lower rdif | Select when cost sensitivity outweighs tight tolerance requirements |
| BZX84-C51 | 51 V nominal, ±5%, SOT-23 package, 450 mW Ptot, 100 Ω rdif | Surface-mount alternative with reduced thermal mass and PCB footprint | Select for space-constrained designs requiring reflow compatibility |
Compared with BZX79-B51,113, the 1N4733A trades ±2% tolerance for lower impedance but higher leakage, while the BZX84-C51 offers SMT assembly at the expense of ±5% tolerance and reduced surge capability.
Availability
BZX79-B51,113 is available at Aetrix Electronics and suitable for industrial sensor conditioning, telecom power supervision, and analog front-end protection requiring stable component supply and long-lifecycle support.
Supply support for BZX79-B51,113 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, specializing in high-volume, high-reliability components for automotive, industrial, and consumer markets.
The BZX79 series belongs to Nexperia's legacy Zener diode portfolio designed for general-purpose voltage regulation and reference applications where precision, reliability, and cost-efficiency are balanced in through-hole implementations.
FAQ
What is the maximum continuous power dissipation for BZX79-B51,113 at 70 °C ambient?
At 70 °C ambient, BZX79-B51,113 must be derated from its 500 mW rating at 50 °C. Using Rth j-a = 380 K/W, the allowable power drops to approximately 395 mW to maintain Tj ≤ 200 °C. Derating curves in Figure 2 of the datasheet confirm this linear reduction above 50 °C.
Can BZX79-B51,113 be used in series for higher voltage references?
Yes - multiple BZX79-B51,113 diodes can be connected in series to achieve higher reference voltages (e.g., two in series yield ~102 V). However, mismatched temperature coefficients and dynamic impedances may degrade overall stability; parallel use is not recommended due to current-sharing imbalance.
Is the cathode marking consistent across all SOD27-packaged BZX79-B devices?
Yes - all SOD27-packaged BZX79-B variants, including BZX79-B51,113, feature a single dark band near one end indicating the cathode terminal. This marking aligns with JEDEC DO-35 standards and is verified in the package outline diagram (page 9 of the datasheet).
How does reverse leakage compare between BZX79-B51,113 and BZX79-C51 variants?
BZX79-B51,113 specifies max. 50 nA IR at VR = 35.7 V, while the ±5% BZX79-C51 variant has identical leakage limits per datasheet Table 2. Both share the same process and structure; tolerance grade does not affect leakage performance at matched VR conditions.
BZX79-B51,113 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-B51,113 FAQ
1.How can I place an order for BZX79-B51,113 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B51,113 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZX79-B51,113 reliable?
The price and inventory of BZX79-B51,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B51,113 is usually 5 days.
3.What payment methods are accepted for BZX79-B51,113?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B51,113 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B51,113?
BZX79-B51,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B51,113 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZX79-B51,113?
For technical support, including BZX79-B51,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B51,113 requirements.
6.How does Aetrix verify that BZX79-B51,113 is sourced from the original manufacturer or authorized distributors?
All BZX79-B51,113 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX79-B51,113 meets industry standards.
7.What is the process for return or replacement of BZX79-B51,113?
All BZX79-B51,113 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B51,113, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZX79-B51,113 part is unused and in its original packaging.
Return procedure for BZX79-B51,113:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B51,113 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
