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Nexperia USA Inc. PZU84-B39-QR
- Part No.:
- PZU84-B39-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B39-QR.pdf
- Description:
- DIODE ZENER 36V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,023
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Product details
Overview
PZU84-B39-QR from Nexperia is a 39 V ±2 % tolerance Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and overvoltage protection in automotive power rails. It delivers 350 Ω differential resistance at IZ = 2 mA, 0.05 μA reverse current at VR = 33.4 V, and operates across −55 °C to +150 °C ambient range - validated per AEC-Q101 for under-hood engine control units.
For engineers reviewing the PZU84-B39-QR datasheet, PZU84-B39-QR pinout, PZU84-B39-QR application, or PZU84-B39-QR equivalent, key selection criteria include Zener voltage accuracy (±2 %), low leakage (<0.05 μA), hard breakdown knee, thermal resistance (Rth(j-a) = 500 K/W), and automotive qualification status.
Technical Context
This Zener diode belongs to the PZU84-Q series' high-precision B-tolerance group, featuring a sharp breakdown knee and very low leakage current optimized for stable reference generation. Its 39 V nominal Zener voltage is specified at IZ = 2 mA with temperature coefficient of +27.3 mV/K, enabling predictable drift compensation in feedback loops.
The device uses silicon planar technology with an anode-cathode–no-connect pinout in SOT23, supporting bidirectional surge handling up to 40 W (100 μs square wave). Junction-to-ambient thermal resistance of 500 K/W ensures reliable operation on standard FR4 PCBs without heatsinking in low-power regulation circuits.
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 12 V/24 V automotive supply monitoring |
| Tolerance | ±2 % - enables tight regulation without post-production trimming in safety-critical voltage supervision |
| Differential Resistance rdif | 350 Ω at IZ = 2 mA - ensures minimal output voltage shift under load transients in reference circuits |
| Reverse Current IR | ≤0.05 μA at VR = 33.4 V - guarantees negligible standby power loss in always-on vehicle modules |
| Power Dissipation Ptot | 250 mW at Tamb = 25 °C - supports continuous operation in compact SOT23 footprint without derating below 85 °C |
| Junction Temperature | −55 °C to +150 °C - meets extended temperature requirements for engine control, transmission, and ADAS subsystems |
| AEC-Q101 Qualified | Yes - certified for automotive discrete semiconductor stress testing including HTGB, HTRB, and temperature cycling |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads and tin-plated terminations compatible with reflow and wave soldering per IPC-J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in reverse-biased Zener configuration |
| 2 | No Connect (n.c.) | Internally unconnected; must remain floating - no PCB trace or thermal pad connection permitted |
| 3 | Cathode (K) | Zener breakdown terminal; ties to regulated voltage rail or error amplifier input in feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Enables clean, repeatable clamping onset - critical for overvoltage detection in CAN/LIN bus power domains |
| Very low leakage current | ≤0.05 μA at 85 % VZ - preserves battery life in always-on telematics and gateway ECUs |
| AEC-Q101 qualification | Validated for automotive use including HTGB (1000 hrs @ 150 °C) and mechanical shock per JESD22-A114 |
| Low dynamic impedance | 350 Ω at 2 mA - maintains <±10 mV regulation error during 10–100 mA load steps in sensor bias supplies |
| E24 voltage coverage | 39 V nominal point within 2.4 V–51 V range - supports standardized BOM consolidation across multiple vehicle platforms |
Applications
| Engine Control Unit (ECU) Power Supervision | Infotainment System Voltage Reference |
|---|---|
Use Scenario: Monitoring 12 V battery rail for brown-out and overvoltage events in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Zener clamp in comparator input stage providing precise 39 V threshold for fault flag generation. Use Value: ±2 % VZ tolerance ensures consistent trip point across temperature and lifetime, eliminating calibration drift in production ECUs. |
Use Scenario: Generating stable 3.3 V LDO reference from switched 5 V supply in head-unit audio processors. IC Role / Device Role / Timing Role: Precision shunt reference feeding TL431 feedback network to regulate auxiliary supply rails. Use Value: 350 Ω rdif minimizes output ripple under dynamic audio load, preserving SNR in analog signal chains. |
| ADAS Camera Module Protection | Body Control Module (BCM) Reset Circuit |
Use Scenario: Clamping transient spikes on 5 V imaging sensor interface lines exposed to ESD and load dump. IC Role / Device Role / Timing Role: Fast-response overvoltage protector placed directly at connector entry point before serializer ICs. Use Value: 40 W non-repetitive peak power rating absorbs ISO 7637-2 Pulse 5a surges without degradation. |
Use Scenario: Providing clean reset voltage threshold for microcontroller startup sequencing after ignition key turn-on. IC Role / Device Role / Timing Role: Zener-based reset supervisor generating POR signal when main 5 V rail crosses 4.75 V. Use Value: Hard breakdown knee ensures monotonic rise of reset signal, preventing false MCU resets during slow-ramp battery recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39 | ±5 % tolerance, higher rdif (500 Ω), no AEC-Q101 qualification | Acceptable for industrial/non-automotive designs where cost > reliability | Select only if automotive qualification and <±2 % accuracy are not required |
| MMSZ4702T1G | 39 V ±5 %, 500 mW Ptot, TO-236AB package (larger footprint), no AEC-Q101 | Higher power handling but incompatible with space-constrained SOT23 layouts | Choose only when thermal margin exceeds 250 mW and board area permits larger package |
Compared with BZX84-C39 and MMSZ4702T1G, PZU84-B39-QR uniquely combines AEC-Q101 compliance, ±2 % tolerance, and SOT23 size - making it the sole option for production automotive Zener references requiring zero field return risk and layout compatibility with legacy footprints.
Availability
PZU84-B39-QR is available at Aetrix Electronics and suitable for automotive ECU power supervision, ADAS camera protection, and BCM reset circuitry requiring stable component supply across multi-year vehicle production cycles.
Supply support for PZU84-B39-QR 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 semiconductor expert focused on essential efficiency-enhancing components, delivering high-performance, high-reliability diodes, MOSFETs, and logic devices for automotive, industrial, and consumer markets.
The PZU84-Q series is part of Nexperia's automotive-qualified Zener portfolio, engineered specifically for robust voltage reference and transient suppression in harsh-environment vehicle electronics.
FAQ
What is the maximum allowable reverse voltage before breakdown for PZU84-B39-QR?
The rated Zener voltage is 39 V nominal, with guaranteed minimum and maximum values of 38.2 V and 39.8 V respectively at IZ = 2 mA. Below 38.2 V, the device remains in high-impedance reverse-blocking state with ≤0.05 μA leakage. Breakdown is not abrupt but follows the specified differential resistance curve above the knee voltage.
Can PZU84-B39-QR be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For >250 mW applications, use a single higher-rated device or add external ballast resistors with individual thermal monitoring per diode.
Is the n.c. pin (pin 2) safe to connect to ground or leave floating on PCB?
Pin 2 is internally unconnected and must remain electrically floating - no trace, copper pour, or solder mask opening should contact it. Grounding or routing to any net risks internal shorting, parametric shift, or premature failure due to unintended parasitic coupling.
How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
At 39 V nominal, the temperature coefficient is +27.3 mV/K. Over a 165 K range, this yields ~4.5 V total drift - but actual system impact is mitigated by operating at fixed IZ and using the diode in closed-loop feedback (e.g., with TL431), where drift contributes <±0.5 % error to final regulated output.
PZU84-B39-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PZU84-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
PZU84-B39-QR FAQ
1.How can I place an order for PZU84-B39-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B39-QR 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 PZU84-B39-QR reliable?
The price and inventory of PZU84-B39-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B39-QR is usually 5 days.
3.What payment methods are accepted for PZU84-B39-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B39-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B39-QR?
PZU84-B39-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B39-QR 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 PZU84-B39-QR?
For technical support, including PZU84-B39-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B39-QR requirements.
6.How does Aetrix verify that PZU84-B39-QR is sourced from the original manufacturer or authorized distributors?
All PZU84-B39-QR 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 PZU84-B39-QR meets industry standards.
7.What is the process for return or replacement of PZU84-B39-QR?
All PZU84-B39-QR units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B39-QR, 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 PZU84-B39-QR part is unused and in its original packaging.
Return procedure for PZU84-B39-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B39-QR Tags
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