My Inquiry
My Account
Nexperia USA Inc. BZX79-C30,133
- Part No.:
- BZX79-C30,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C30,133.pdf
- Description:
- DIODE ZENER 30V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX79-C30,133 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 30 V regulation at 2 mA test current, 70 Ω typical differential resistance, and −20.6 mV/K temperature coefficient. It operates in low-power voltage reference and stabilization circuits, such as power supply feedback networks and analog sensor biasing, within industrial control and consumer electronics.
For engineers reviewing the BZX79-C30,133 datasheet, BZX79-C30,133 pinout, BZX79-C30,133 application, or BZX79-C30,133 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, thermal coefficient, peak surge capability (50 A non-repetitive), and DO-35 package compatibility with through-hole PCB assembly.
Technical Context
This device functions as a two-terminal passive voltage reference, relying on controlled reverse breakdown conduction. Its regulation accuracy depends on stable test current (IZ = 2 mA), junction temperature (Tj = 25 °C), and thermal management via axial leads with Rth j-a = 380 K/W.
The BZX79-C30,133 exhibits a negative temperature coefficient (−20.6 mV/K), meaning its Zener voltage decreases with rising temperature - critical for compensation design in precision references. Its 50 nA max reverse leakage at VR = 0.7 × VZ (21 V) ensures minimal quiescent current draw in battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4 V to 30.6 V at IZ = 2 mA - defines stable regulation band for feedback loop setpoints |
| Differential Resistance (rdif) | 70 Ω typical at IZ = 2 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | −20.6 mV/K at IZ = 2 mA - enables thermal drift prediction and compensation circuit design |
| Reverse Leakage (IR) | 50 nA max at VR = 21 V - ensures low standby current in always-on reference nodes |
| Non-repetitive Peak Current (IZSM) | 1.0 A at tp = 100 μs - supports transient overvoltage clamping without failure |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB |
| Package | SOD27 (DO-35) glass axial - provides hermetic sealing and proven reliability in legacy designs |
Pinout & Package
Hermetically sealed glass SOD27 (DO-35) package with axial leads; cathode identified by a single black band near one lead end. No active die-side terminals - device operates as a two-terminal bilateral component in reverse-bias configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side of regulation path; defines polarity for Zener operation |
| Cathode | Reverse breakdown terminal / Voltage reference output node | Marked with black band; connected to regulated voltage rail or feedback divider top node |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required, e.g., non-critical power rail monitoring |
| 500 mW total power dissipation | Supports continuous operation in compact through-hole designs without heatsinking under ambient ≤50 °C |
| Hermetic glass SOD27 package | Ensures long-term parameter stability and moisture resistance in industrial environments |
| 40 W non-repetitive peak reverse power | Provides robust transient suppression capability during short-duration surges (e.g., ESD or inductive kick) |
Applications
| Power Supply Feedback Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in linear or switching power supplies using TL431-compatible feedback topology. IC Role / Device Role / Timing Role: Zener diode serves as precision voltage reference node in resistive divider feeding error amplifier input. Use Value: 30 V nominal Zener voltage enables stable 24 V rail regulation with margin; ±5% tolerance aligns with industrial supply accuracy requirements. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding absolute maximum ratings. IC Role / Device Role / Timing Role: Acts as shunt clamp, conducting excess energy to ground when voltage exceeds 30 V threshold. Use Value: 1.0 A non-repetitive peak current rating allows safe absorption of 100 μs surges up to 40 W without degradation. |
| Sensor Biasing Reference | ADC Input Level Shifting |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or pressure sensors in data acquisition modules. IC Role / Device Role / Timing Role: Supplies constant bias current through series resistor to generate known reference potential across sensor element. Use Value: Low 50 nA reverse leakage minimizes measurement error in high-impedance sensor bridges; −20.6 mV/K coefficient supports predictable drift modeling. | Use Scenario: Scaling analog sensor outputs to match full-scale input range of 12-bit ADCs with 3.3 V reference. IC Role / Device Role / Timing Role: Forms part of resistive divider network that attenuates and offsets signal before ADC sampling. Use Value: Stable 30 V Zener voltage enables precise ratio-based attenuation; DO-35 package allows manual prototyping and field repairability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 30 V nominal, ±5%, 1 W Ptot, DO-41 package | Higher power rating supports higher continuous current but requires larger PCB footprint | Select when >500 mW steady-state dissipation is needed; not drop-in due to DO-41 vs DO-35 lead spacing |
| BZX79-B30,113 | 30 V nominal, ±2%, same DO-35 package and 500 mW rating | Tighter tolerance improves accuracy in precision feedback loops but increases cost | Select when regulation stability <±2% is required; identical mechanical fit and thermal behavior |
Compared with BZX79-C30,133, the 1N4745A offers higher power headroom but larger size, while the BZX79-B30,113 delivers tighter voltage control at same form factor - choice depends on whether cost-sensitive tolerance or thermal/power margin dominates the design priority.
Availability
BZX79-C30,133 is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C30,133 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, specializing in high-volume, high-reliability components for automotive, industrial, and consumer markets.
The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered for cost-effective, stable voltage regulation in general-purpose analog and power management circuits.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX79-C30,133 has no specified maximum continuous reverse current rating - it is designed for regulated Zener operation at IZ = 2 mA. Continuous current must be limited by external series resistance to maintain Ptot ≤ 500 mW and Tj ≤ 200 °C. Exceeding this risks thermal runaway and permanent damage.
Can this diode be used in surface-mount designs?
No - the BZX79-C30,133 uses a through-hole SOD27 (DO-35) glass axial package and is not compatible with SMT reflow processes. For surface-mount equivalents, consider Nexperia's MMBZ52xx series or similar SOD-123 packaged Zeners with matching voltage and tolerance.
How does the temperature coefficient affect long-term stability?
With a typical SZ of −20.6 mV/K, the BZX79-C30,133's Zener voltage drops ~0.62 V over a 30 °C rise (e.g., from 25 °C to 55 °C). This drift must be accounted for in precision references; compensation techniques include pairing with positive-TC components or operating at constant temperature.
Is the cathode marking consistent across all production lots?
Yes - per Nexperia's SOD27 package specification, the cathode is always marked by a single black band located near one lead end. This marking is laser-etched or ink-printed during final test and remains consistent across all manufacturing lots since 2002, including post-Nexperia transition revisions.
BZX79-C30,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- 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-C30,133 FAQ
1.How can I place an order for BZX79-C30,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C30,133 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-C30,133 reliable?
The price and inventory of BZX79-C30,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C30,133 is usually 5 days.
3.What payment methods are accepted for BZX79-C30,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C30,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C30,133?
BZX79-C30,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C30,133 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-C30,133?
For technical support, including BZX79-C30,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C30,133 requirements.
6.How does Aetrix verify that BZX79-C30,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-C30,133 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-C30,133 meets industry standards.
7.What is the process for return or replacement of BZX79-C30,133?
All BZX79-C30,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C30,133, 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-C30,133 part is unused and in its original packaging.
Return procedure for BZX79-C30,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-C30,133 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…
