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NXP Semiconductors BZX84-B39/LF1R
- Part No.:
- BZX84-B39/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B39/LF1R.pdf
- Description:
- DIODE ZENER 39V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
BZX84-B39/LF1R from NXP Semiconductors is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 39 V nominal breakdown voltage at 2 mA, 250 mW total power dissipation, and AEC-Q101 qualified for automotive use. It provides stable reference voltage in low-power supply regulation and overvoltage protection circuits.
For engineers reviewing the BZX84-B39/LF1R datasheet, BZX84-B39/LF1R pinout, BZX84-B39/LF1R application, or BZX84-B39/LF1R equivalent, key selection criteria include its 39 V ±2 % Zener voltage tolerance, 80 Ω typical differential resistance at 2 mA, 0.05 μA reverse current at 29.4 V, AEC-Q101 qualification, and SOT23 surface-mount compatibility with standard FR4 PCB layouts.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 39 V reference by conducting reverse current above its breakdown threshold. Its Zener mechanism delivers predictable clamping behavior under transient overvoltage conditions.
Designed for ambient temperatures up to +150 °C and junction temperatures up to +150 °C, it supports automotive-grade reliability with non-repetitive peak reverse power dissipation of 40 W (100 μs pulse) and thermal resistance from junction to ambient of 500 K/W in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.2 V to 39.8 V at IZ = 2 mA - defines precise clamping threshold for 39 V nominal regulation |
| Tolerance | ±2 % - ensures tight voltage accuracy without trimming in production designs |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdiff) | 80 Ω typical at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 0.05 μA max at VR = 29.4 V - guarantees low leakage below breakdown, critical for battery-powered standby circuits |
| AEC-Q101 Qualified | Validated for automotive applications - confirms reliability under temperature cycling, humidity, and mechanical stress per AEC standard |
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 for reflow and wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Connected to lower-potential node in shunt regulation; reverse-biased operation requires cathode at higher potential |
| 2 (n.c.) | Not connected | Internally unconnected terminal - must remain floating; no PCB trace or pad required |
| 3 (Cathode) | Cathode connection | Connected to regulated voltage rail; carries full reverse current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct replacement in precision reference designs without calibration or resistor adjustment |
| AEC-Q101 qualification | Supports deployment in automotive body control modules, infotainment power supplies, and ADAS sensor interfaces |
| 250 mW power rating in SOT23 | Provides sufficient headroom for transient suppression in 12 V/24 V vehicle systems without requiring larger packages |
| Non-repetitive peak reverse power: 40 W | Withstands ISO 7637-2 pulse 1 and pulse 2a transients when used with appropriate series impedance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping transients on 12 V battery-supplied microcontroller I/O lines in automotive door modules. IC Role / Device Role / Timing Role: Shunt voltage regulator providing overvoltage protection by diverting surge current away from sensitive logic inputs. Use Value: AEC-Q101 qualification and 40 W peak power handling ensure robustness against load-dump and jump-start events per ISO 16750-2. | Use Scenario: Generating stable 39 V reference for analog front-end circuitry in industrial pressure transducers. IC Role / Device Role / Timing Role: Precision Zener reference source establishing fixed bias point for signal conditioning amplifiers. Use Value: ±2 % tolerance and 80 Ω differential resistance minimize drift and improve measurement repeatability across temperature. |
| Consumer Device Voltage Clamp | Telecom Line Interface Protection |
Use Scenario: Protecting USB-C power delivery negotiation ICs from accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Reverse-biased Zener clamp limiting input voltage to safe levels during fault conditions. Use Value: Low 0.05 μA leakage at 29.4 V preserves standby current budget while enabling fast response to overvoltage events. | Use Scenario: Safeguarding Ethernet PHY interface circuitry against induced surges on PoE-powered network equipment. IC Role / Device Role / Timing Role: Secondary clamping element working with primary TVS to refine voltage limiting window. Use Value: Tight 38.2–39.8 V breakdown range complements primary TVS devices to reduce clamping overshoot and protect 3.3 V/5 V logic rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5242B | 39 V ±5 % tolerance; 350 mW power rating; SOT23 package; not AEC-Q101 qualified | Suitable for commercial-grade power supplies but lacks automotive qualification and tighter tolerance | Select when cost sensitivity outweighs automotive compliance and precision requirements |
| Vishay BZX84-C39 | 39 V ±5 % tolerance; same SOT23 package and 250 mW rating; AEC-Q101 qualified | Acceptable for less critical automotive subsystems where ±5 % voltage variation is tolerable | Choose when broader tolerance is acceptable and AEC-Q101 compliance remains mandatory |
Compared with BZX84-B39/LF1R, MMBZ5242B offers higher power but sacrifices automotive qualification and voltage accuracy, while BZX84-C39 retains AEC-Q101 compliance but trades ±2 % precision for ±5 % tolerance-making BZX84-B39/LF1R optimal for safety-critical 39 V reference and clamping where both accuracy and automotive reliability are required.
Availability
BZX84-B39/LF1R is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor reference, consumer device voltage clamp, and telecom line interface protection requiring stable component supply and long-term lifecycle support.
Supply support for BZX84-B39/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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in RF, analog, and mixed-signal technologies.
The BZX84 series belongs to NXP's portfolio of discrete Zener regulators designed specifically for high-reliability voltage reference and overvoltage protection in automotive and industrial environments.
FAQ
What is the exact Zener voltage range for BZX84-B39/LF1R at 2 mA test current?
The BZX84-B39/LF1R has a guaranteed Zener voltage range of 38.2 V to 39.8 V when tested at IZ = 2 mA, reflecting its ±2 % tolerance around the nominal 39 V rating. This range is specified in Table 9 of the NXP datasheet and applies under Tj = 25 °C conditions. The BZX84-B39/LF1R maintains this performance across its qualified operating temperature range.
Is BZX84-B39/LF1R suitable for automotive applications?
Yes, BZX84-B39/LF1R is AEC-Q101 qualified per NXP's official documentation, confirming its suitability for automotive applications including body electronics, infotainment power supplies, and ADAS sensor interfaces. The BZX84-B39/LF1R undergoes stress testing for temperature cycling, humidity, and mechanical robustness as defined in the AEC-Q101 standard.
What is the maximum non-repetitive peak reverse power dissipation for BZX84-B39/LF1R?
The BZX84-B39/LF1R supports a non-repetitive peak reverse power dissipation of 40 W under pulse conditions of tp ≤ 100 μs and duty cycle δ ≤ 0.02, as specified in Table 5 of the NXP datasheet. This rating enables the BZX84-B39/LF1R to absorb short-duration transients such as ISO 7637-2 pulse 1 without failure when properly series-limited.
Does BZX84-B39/LF1R have a connected pin 2?
No, pin 2 of the BZX84-B39/LF1R is internally not connected (n.c.), as confirmed in Table 2 "Pinning" of the NXP datasheet. This terminal must remain unconnected on the PCB layout; routing traces or applying solder to pin 2 may compromise reliability or cause unintended electrical behavior. The BZX84-B39/LF1R functions correctly using only pins 1 (anode) and 3 (cathode).
What is the thermal resistance from junction to ambient for BZX84-B39/LF1R?
The thermal resistance from junction to ambient (Rth(j-a)) for BZX84-B39/LF1R is 500 K/W in free air, measured on a standard FR4 PCB with single-sided copper and tin-plated finish, per Table 6 of the NXP datasheet. This value informs derating calculations for continuous power dissipation at elevated ambient temperatures and directly impacts the BZX84-B39/LF1R's safe operating area.
BZX84-B39/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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B39/LF1R FAQ
1.How can I place an order for BZX84-B39/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B39/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-B39/LF1R reliable?
The price and inventory of BZX84-B39/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-B39/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-B39/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B39/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B39/LF1R?
BZX84-B39/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B39/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-B39/LF1R?
For technical support, including BZX84-B39/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B39/LF1R requirements.
6.How does Aetrix verify that BZX84-B39/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-B39/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-B39/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-B39/LF1R?
All BZX84-B39/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B39/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-B39/LF1R part is unused and in its original packaging.
Return procedure for BZX84-B39/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B39/LF1R Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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