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Nexperia USA Inc. BZX79-B27,133
- Part No.:
- BZX79-B27,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B27,133.pdf
- Description:
- DIODE ZENER 27V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,774
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Product details
Overview
BZX79-B27,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 27 V breakdown voltage at 2 mA test current, 65 Ω typical differential resistance, and 18.0 mV/K temperature coefficient. It operates as a low-power voltage reference in biasing, regulation, and overvoltage protection circuits, rated for 500 mW total power dissipation at 50 °C ambient and packaged in hermetically sealed SOD27 (DO-35) glass.
For engineers reviewing the BZX79-B27,133 datasheet, BZX79-B27,133 pinout, BZX79-B27,133 application, or BZX79-B27,133 equivalent, this page delivers verified electrical parameters, thermal behavior, package geometry, real-world use cases, and validated alternative parts - all aligned to the official Nexperia product data sheet dated 2002 Feb 27.
Technical Context
This Zener diode functions in reverse-biased mode to maintain stable DC voltage under varying load or supply conditions. Its 27 V nominal Zener voltage is specified at IZtest = 2 mA, with 65 Ω typical dynamic impedance and 18.0 mV/K temperature coefficient - indicating moderate positive drift above 27 V.
Designed for low-power stabilization, it supports non-repetitive peak reverse power up to 40 W for 100 μs pulses and exhibits ≤1.0 A peak surge current. The SOD27 axial-glass package ensures hermetic sealing and compatibility with through-hole PCB assembly, with thermal resistance Rth j-a = 380 K/W under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.5–27.5 V at IZ = 2 mA - defines precise regulation point for feedback or reference networks |
| Differential Resistance (rdif) | 65 Ω typical at IZ = 2 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | 18.0 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB |
| Reverse Current (IR) | ≤50 nA at VR = 0.7 × VZnom - ensures minimal leakage in high-impedance reference paths |
| Non-repetitive Peak Current (IZSM) | 1.0 A at tp = 100 μs - supports transient overvoltage clamping without damage |
| Junction-to-Ambient Thermal Resistance | 380 K/W - governs steady-state temperature rise under continuous bias |
Pinout & Package
The BZX79-B27,133 is a two-terminal axial-leaded Zener diode in the SOD27 (DO-35) hermetically sealed glass package. The cathode is marked by a band on the glass body; the anode is the unmarked lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-bias voltage reference node | Connected to regulated output or feedback point; carries reverse current during regulation |
| Anode (unbanded end) | Reference ground or return path | Tied to circuit common; completes Zener conduction loop when reverse voltage exceeds VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-manufacturing trimming in precision reference designs |
| Hermetically sealed SOD27 glass package | Provides long-term stability and moisture resistance in industrial environments |
| 500 mW power rating at 50 °C ambient | Supports reliable operation in compact, non-ventilated enclosures with minimal heatsinking |
| Low 50 nA max reverse leakage at 0.7×VZ | Minimizes error in high-impedance voltage divider or op-amp reference inputs |
| 18.0 mV/K temperature coefficient | Allows predictable compensation in temperature-sensitive analog circuits |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 27 V reference for linear regulator feedback or ADC reference buffer. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp reference node voltage. Use Value: Delivers ±2% accuracy and <65 Ω dynamic impedance to minimize load-induced voltage shift. | Use Scenario: Clamping transient surges on 24 V industrial control lines to protect downstream logic. IC Role / Device Role / Timing Role: Voltage-limiting element absorbing short-duration spikes above 27 V. Use Value: Withstands 1.0 A non-repetitive surge (100 μs) while holding clamped voltage within specification. |
| Sensor Biasing Circuit | Signal Level Shifting |
Use Scenario: Biasing a 27 V avalanche photodiode or high-voltage sensor interface. IC Role / Device Role / Timing Role: Precision DC bias source maintaining constant reverse bias across sensor junction. Use Value: Low 50 nA leakage prevents signal current corruption in picoamp-level sensor outputs. | Use Scenario: Shifting TTL/CMOS logic levels to 27 V for driving external relays or analog multiplexers. IC Role / Device Role / Timing Role: Clamp diode establishing defined high-level threshold in level translation network. Use Value: Predictable 27 V breakdown enables repeatable switching thresholds independent of supply variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | 27 V ±5%, 100 Ω typical rdif, DO-41 package | Higher tolerance and impedance; larger DO-41 footprint | Select when cost sensitivity outweighs precision and board space constraints |
| BZX85C27 | 27 V ±5%, 120 Ω typical rdif, DO-41 package, 1.3 W rating | Higher power capability but looser tolerance and higher impedance | Choose for higher continuous power needs where ±5% regulation is acceptable |
Compared with BZX79-B27,133, the 1N4750A offers lower cost but sacrifices 2.5× higher dynamic impedance and ±5% tolerance; BZX85C27 trades precision for 2.6× higher power rating - making the BZX79-B27,133 optimal for space-constrained, precision-stable 27 V references.
Availability
BZX79-B27,133 is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and embedded power supply references requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for BZX79-B27,133 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, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products business and headquartered in Nijmegen, Netherlands.
The BZX79 series belongs to Nexperia's legacy Zener diode portfolio, engineered specifically for low-power voltage regulation and reference applications in automotive, industrial, and consumer electronics where reliability and parametric consistency are critical.
FAQ
What is the maximum continuous reverse current the BZX79-B27,133 can sustain?
The device has no specified maximum continuous reverse current; instead, its safe operating limit is governed by power dissipation. At 27 V, the maximum continuous Zener current is approximately 18.5 mA (500 mW ÷ 27 V), assuming 50 °C ambient and standard PCB mounting per datasheet note 2.
Does the BZX79-B27,133 have a cathode marking, and how is it oriented?
Yes - the cathode is identified by a single dark band on the glass body of the SOD27 package. When mounted with leads vertical and band facing left, the left lead is cathode and right lead is anode, consistent with standard DO-35 polarity conventions.
Can the BZX79-B27,133 be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing variations in VZ and dynamic resistance, causing current imbalance. Parallel connection risks thermal runaway and premature failure. For higher power, select a single higher-rated part like BZX85C27 or use active regulation.
What is the typical junction capacitance of the BZX79-B27,133 at zero bias?
Per Table 2 in the datasheet, the typical diode capacitance (Cd) is 25 pF at f = 1 MHz and VR = 0 V. This value impacts high-frequency noise filtering and AC coupling performance in reference circuits.
BZX79-B27,133 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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 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-B27,133 FAQ
1.How can I place an order for BZX79-B27,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B27,133 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-B27,133 reliable?
The price and inventory of BZX79-B27,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B27,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B27,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B27,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B27,133?
BZX79-B27,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B27,133 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-B27,133?
For technical support, including BZX79-B27,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B27,133 requirements.
6.How does Aetrix verify that BZX79-B27,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B27,133 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-B27,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B27,133?
All BZX79-B27,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B27,133, 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-B27,133 part is unused and in its original packaging.
Return procedure for BZX79-B27,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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