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Nexperia USA Inc. BZX79-B75,133
- Part No.:
- BZX79-B75,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B75,133.pdf
- Description:
- DIODE ZENER 75V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,960
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Product details
Overview
BZX79-B75,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 75 V, total power dissipation up to 500 mW at Tamb = 50 °C, differential resistance ≤500 Ω at IZtest = 2 mA, and non-repetitive peak reverse power dissipation of 40 W (tp = 100 μs). It operates as a precision low-power voltage reference in analog front-ends and power supply feedback networks.
For engineers reviewing the BZX79-B75,133 datasheet, BZX79-B75,133 pinout, BZX79-B75,133 application, or BZX79-B75,133 equivalent, this part serves in stable voltage referencing where tight tolerance, low temperature coefficient drift, and hermetic glass package reliability are required - especially in industrial sensor signal conditioning and legacy power supply designs.
Technical Context
This device is a single-junction, silicon planar Zener diode optimized for low-current regulation (IZtest = 2 mA), with cathode-indicated axial leads in a hermetically sealed SOD27 (DO-35) glass package. Its thermal resistance from junction to ambient is 380 K/W under standard mounting conditions.
The BZX79-B75,133 exhibits a positive temperature coefficient of +73.4 to +88.6 mV/K across its operating current range, enabling predictable voltage drift compensation in series-connected reference configurations. Reverse leakage remains ≤50 nA at VR = 0.7 × VZnom (52.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 73.5 V to 76.5 V at IZ = 2 mA - defines precise regulation point for feedback loops requiring high-voltage reference stability |
| Tolerance | ±2% - enables tighter output voltage control vs. ±5% C-series variants in critical biasing applications |
| Differential Resistance (rdif) | ≤500 Ω max at IZ = 2 mA - limits regulation error under load current variation in low-power references |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports transient overvoltage clamping in surge-protected input stages |
| Reverse Leakage (IR) | ≤50 nA at VR = 52.5 V - ensures minimal current draw in high-impedance reference dividers |
| Package | SOD27 (DO-35) - hermetically sealed glass axial package rated for −65 °C to +200 °C storage and operation |
| Junction-to-Ambient Rth | 380 K/W - determines maximum allowable ambient temperature for continuous 500 mW operation without heatsinking |
Pinout & Package
Hermetically sealed glass SOD27 (DO-35) package with axial leads; cathode identified by a colored band on the glass body. Device has two terminals only: anode and cathode - no internal circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower-potential node when used in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; connects to voltage source via current-limiting resistor to establish stable VZ at output |
Key Features
| Feature | Design Value |
|---|---|
| ±2% voltage tolerance | Enables direct replacement in circuits requiring tighter regulation than ±5% Zeners without recalculating bias resistors |
| Hermetic glass SOD27 package | Provides long-term parameter stability and moisture resistance in harsh environments without conformal coating |
| Low IR at high VR | 50 nA max at 52.5 V ensures <1 µW quiescent loss in high-impedance voltage divider references |
| Controlled temperature coefficient | +73.4 to +88.6 mV/K allows predictable drift compensation when paired with negative-TC components |
Applications
| Industrial Sensor Signal Conditioning | Legacy Linear Power Supply Feedback |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter ICs in temperature/pressure transducers. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed bias point for op-amp and current-loop driver circuitry. Use Value: ±2% tolerance and low IR ensure <0.5% full-scale error contribution in 16-bit measurement systems over −40 °C to +85 °C. | Use Scenario: Setting regulated output voltage in discrete 78xx-style linear regulators using external pass transistors. IC Role / Device Role / Timing Role: Precision voltage reference connected to base of series pass transistor for output voltage programming. Use Value: 75 V rating supports >60 V output designs; hermetic package prevents parameter shift during 10+ year field deployment. |
| High-Voltage Analog Front-End Biasing | Overvoltage Protection Clamping |
Use Scenario: Generating stable bias for high-side current sense amplifiers operating from 48 V bus rails. IC Role / Device Role / Timing Role: Low-power Zener shunt reference establishing common-mode voltage for isolated amplifier inputs. Use Value: Differential resistance ≤500 Ω maintains <2.5 mV regulation error across 10 µA to 1 mA load variations. | Use Scenario: Transient voltage suppression in telecom line interface circuits exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated during 100 µs overvoltage events exceeding 75 V threshold. Use Value: 40 W non-repetitive peak power rating absorbs IEC 61000-4-5 Level 4 surge energy without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5265B | Surface-mount SOT-23 package; same 75 V ±5%; Ptot = 350 mW; higher rdif (≤700 Ω) | Requires PCB redesign; unsuitable for through-hole legacy boards or high-temp solder rework cycles | Select when space-constrained layouts demand SMT integration and ±5% tolerance is acceptable |
| BZX85C75 | Through-hole DO-41 package; ±5% tolerance; Ptot = 1.3 W; rdif ≤200 Ω at IZ = 40 mA | Higher power handling but looser tolerance; requires larger current-limiting resistor for same Zener current | Select when higher surge robustness and lower dynamic impedance are prioritized over voltage accuracy |
Compared with MMBZ5265B and BZX85C75, the BZX79-B75,133 uniquely balances ±2% precision, through-hole compatibility, and hermetic reliability - making it irreplaceable in field-deployed instrumentation where calibration retention and long-term drift matter most.
Availability
BZX79-B75,133 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, legacy linear power supply feedback, high-voltage analog front-end biasing, and overvoltage protection clamping requiring stable component supply across extended production lifecycles.
Supply support for BZX79-B75,133 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 computing markets.
The BZX79 series belongs to Nexperia's legacy Zener diode portfolio designed specifically for cost-sensitive, high-stability voltage reference and regulation in through-hole-based industrial and consumer electronics.
FAQ
What is the maximum continuous power dissipation for BZX79-B75,133 at 50 °C ambient?
The maximum continuous total power dissipation is 500 mW when mounted on a PCB without metallization pad and with lead length ≤8 mm at Tamb = 50 °C. Derating applies above this temperature per the 380 K/W thermal resistance specification.
Does BZX79-B75,133 have a specified Zener test current, and what is its value?
Yes - the Zener voltage is specified at IZtest = 2 mA, as confirmed in Table 2 of the datasheet. This current level is used to measure VZ, differential resistance, and temperature coefficient, and must be maintained via appropriate series resistor selection in application circuits.
How is polarity identified on the BZX79-B75,133 package?
The cathode is marked by a distinct colored band on the glass body of the SOD27 (DO-35) package. When viewed with the band on the left, the lead on the right is the anode; correct orientation is essential for proper reverse-bias operation in Zener regulation mode.
Can BZX79-B75,133 be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing variance in VZ and rdif, causing current imbalance and thermal runaway when paralleled. For higher power, use a single higher-rated device like BZX85C75 or implement active regulation instead.
BZX79-B75,133 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):
- 75 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 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-B75,133 FAQ
1.How can I place an order for BZX79-B75,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B75,133 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-B75,133 reliable?
The price and inventory of BZX79-B75,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B75,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B75,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B75,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B75,133?
BZX79-B75,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B75,133 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-B75,133?
For technical support, including BZX79-B75,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B75,133 requirements.
6.How does Aetrix verify that BZX79-B75,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B75,133 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-B75,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B75,133?
All BZX79-B75,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B75,133, 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-B75,133 part is unused and in its original packaging.
Return procedure for BZX79-B75,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B75,133 Tags
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