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NXP Semiconductors BZX84-B33/LF1R
- Part No.:
- BZX84-B33/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B33/LF1R.pdf
- Description:
- DIODE ZENER 33V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,885
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Product details
Overview
BZX84-B33/LF1R from NXP Semiconductors is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, with nominal breakdown voltage 33 V, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use. It provides stable reference voltage in low-power supply regulation and overvoltage protection circuits.
For engineers reviewing the BZX84-B33/LF1R datasheet, BZX84-B33/LF1R pinout, BZX84-B33/LF1R application, or BZX84-B33/LF1R equivalent, key selection factors include its 33 V ±2 % Zener voltage tolerance, 75 Ω typical differential resistance at IZ = 2 mA, 0.05 μA maximum reverse current at VR = 27 V, AEC-Q101 qualification, and SOT23 surface-mount compatibility with standard FR4 PCB layout.
Technical Context
The BZX84-B33/LF1R operates as a two-terminal shunt voltage regulator, maintaining a stable 33 V reference across its cathode-anode terminals under reverse bias. Its Zener breakdown mechanism delivers predictable regulation with 75 Ω typical dynamic impedance and −2.0 to +0.2 mV/K temperature coefficient at IZ = 2 mA.
Designed for low-power applications, it supports continuous operation up to 150 °C junction temperature and withstands non-repetitive peak reverse power of 40 W (tp ≤ 100 μs). The device is mounted on FR4 PCB with single-sided copper and standard SOT23 footprint per JEDEC TO-236AB outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.3 V to 33.7 V at IZ = 2 mA - defines tight ±2 % regulation window for precision reference generation |
| Differential Resistance (rdif) | 75 Ω typical at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤0.05 μA at VR = 27 V - ensures minimal leakage in standby or high-impedance sensing nodes |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W for tp ≤ 100 μs - enables transient overvoltage clamping without damage |
| Thermal Resistance (Rth(j-a)) | 500 K/W in free air - informs derating requirements for ambient temperature operation |
| AEC-Q101 Qualified | Validated for automotive-grade reliability - supports deployment in engine control, body electronics, and ADAS subsystems |
Pinout & Package
Package: SOT23 (TO-236AB), plastic surface-mounted package with 3 leads; dimensions 2.9 mm × 1.3 mm × 1.0 mm (L × W × H), standard footprint per Fig 9/10 in datasheet Rev. 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 (n.c.) | Not connected | Internally unconnected; must remain floating-no PCB trace or solder joint required |
| 3 (Cathode) | Cathode connection | Reverse-biased terminal; connects to regulated voltage rail or clamping point |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants (BZX84-C), reducing need for post-regulation trimming |
| SOT23 surface-mount package | Supports automated pick-and-place assembly and high-density PCB layouts with 0.95 mm lead pitch |
| AEC-Q101 qualification | Validates robustness for automotive environments including thermal cycling, humidity, and mechanical shock |
| 250 mW power rating at 25 °C | Permits direct integration into low-current bias networks without external heat sinking |
| Low 0.05 μA IR at 27 V | Minimizes quiescent current draw in battery-powered systems and high-impedance feedback paths |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V microcontroller supply rail fed from 12 V vehicle battery with load dump transients. IC Role / Device Role / Timing Role: Shunt voltage clamp protecting downstream LDO input during ISO 7637-2 pulse 5a events. Use Value: Withstands 40 W non-repetitive surges and maintains 33 V clamping threshold within ±2 %, preventing LDO overvoltage failure. |
Use Scenario: Providing stable reference for 16-bit ADC measuring thermocouple output in PLC analog input module. IC Role / Device Role / Timing Role: Precision Zener reference source for ratiometric measurement circuitry. Use Value: 75 Ω dynamic impedance and −2.0 to +0.2 mV/K tempco ensure <0.1 % reference drift over −40 °C to +85 °C operating range. |
| Consumer Power Adapter Feedback | Medical Device Overvoltage Protection |
Use Scenario: Secondary-side voltage sensing in flyback converter for USB-C PD adapter. IC Role / Device Role / Timing Role: Zener-based optocoupler feedback reference setting output voltage accuracy. Use Value: Tight 32.3–33.7 V tolerance directly translates to ±1.5 % output regulation without trimming resistors. |
Use Scenario: Input-stage clamping on ECG front-end amplifier to prevent electrode overvoltage damage. IC Role / Device Role / Timing Role: Fast-acting shunt protector limiting common-mode voltage to safe levels. Use Value: 100 ns response to transients and 0.05 μA leakage preserve signal integrity and patient safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5262BS-7-F | 33 V ±5 % tolerance, 350 mW Ptot, SOT23 package, no AEC-Q101 qualification | Higher power but looser tolerance; suitable for cost-sensitive industrial supplies where automotive reliability not required | Select when higher continuous power margin is needed and ±5 % regulation is acceptable |
| Vishay BZX84-C33-TP | 33 V ±5 % tolerance, 300 mW Ptot, SOT23, AEC-Q101 qualified | Same automotive qualification but wider tolerance; better surge handling due to higher Ptot | Select when AEC-Q101 compliance is mandatory but ±2 % precision is unnecessary |
Compared with MMBZ5262BS-7-F and BZX84-C33-TP, the BZX84-B33/LF1R uniquely balances ±2 % voltage accuracy, AEC-Q101 qualification, and 250 mW dissipation-making it optimal for automotive and industrial designs requiring both precision and reliability without over-spec'ing power capability.
Availability
BZX84-B33/LF1R is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical device protection circuits requiring stable component supply and long-term lifecycle support.
Supply support for BZX84-B33/LF1R 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The BZX84 series belongs to NXP's discrete voltage regulator portfolio, engineered specifically for high-reliability, low-power Zener reference and clamping applications in harsh environments including automotive under-hood and industrial control cabinets.
FAQ
What is the Zener voltage tolerance of BZX84-B33/LF1R?
The BZX84-B33/LF1R has a nominal Zener voltage of 33 V with a ±2 % tolerance, meaning its actual breakdown voltage falls between 32.3 V and 33.7 V when tested at IZ = 2 mA. This tighter tolerance than the ±5 % BZX84-C variants makes BZX84-B33/LF1R suitable for applications demanding higher regulation accuracy without external calibration.
Is BZX84-B33/LF1R qualified for automotive use?
Yes, BZX84-B33/LF1R is AEC-Q101 qualified per the NXP product data sheet Rev. 6. This certification confirms its reliability under automotive stress conditions including temperature cycling, humidity, and mechanical shock-enabling use in engine control units, body control modules, and ADAS power domains.
What is the maximum reverse current for BZX84-B33/LF1R at 27 V?
At VR = 27 V, the maximum reverse current (IR) for BZX84-B33/LF1R is 0.05 μA, as specified in Table 9 of the NXP datasheet. This ultra-low leakage supports energy-efficient design in battery-powered systems and high-impedance feedback networks where standby current must be minimized.
Does BZX84-B33/LF1R have a connected pin 2?
No, pin 2 of BZX84-B33/LF1R is marked "n.c." (not connected) per Table 2 in the NXP datasheet. It is internally unconnected and must remain electrically floating-no PCB trace, solder joint, or grounding should be applied to this terminal to avoid unintended parasitic paths or mechanical stress.
What is the differential resistance of BZX84-B33/LF1R at 2 mA test current?
The typical differential resistance (rdif) of BZX84-B33/LF1R is 75 Ω at IZ = 2 mA, as listed in Table 9 of the NXP datasheet. This value quantifies the dynamic impedance across the Zener region and directly affects output voltage stability under varying load or current conditions in regulation circuits.
BZX84-B33/LF1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (TO-236AB)
BZX84-B33/LF1R FAQ
1.How can I place an order for BZX84-B33/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B33/LF1R 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 BZX84-B33/LF1R reliable?
The price and inventory of BZX84-B33/LF1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B33/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-B33/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B33/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B33/LF1R?
BZX84-B33/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B33/LF1R 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 BZX84-B33/LF1R?
For technical support, including BZX84-B33/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B33/LF1R requirements.
6.How does Aetrix verify that BZX84-B33/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-B33/LF1R 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 BZX84-B33/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-B33/LF1R?
All BZX84-B33/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B33/LF1R, 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 BZX84-B33/LF1R part is unused and in its original packaging.
Return procedure for BZX84-B33/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B33/LF1R Tags
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