My Inquiry
My Account
Nexperia USA Inc. PZU84-B27R
- Part No.:
- PZU84-B27R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B27R.pdf
- Description:
- DIODE ZENER 27V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,277
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PZU84-B27R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 27 V nominal regulation at 5 mA with 21 Ω typical differential resistance and −21.4 mV/K temperature coefficient. It delivers stable reference voltage for power supply feedback loops, overvoltage protection clamping, and analog signal conditioning in industrial control modules.
For engineers reviewing the PZU84-B27R datasheet, PZU84-B27R pinout, PZU84-B27R application, or PZU84-B27R equivalent, this page details its verified Zener breakdown behavior, thermal derating limits, low-leakage performance at 27 V, and SOT23 terminal mapping-critical for PCB layout, ESD-sensitive bias networks, and precision voltage reference design.
Technical Context
This Zener diode operates in reverse-biased avalanche mode to maintain a stable 27 V reference across load variations from 0.5 mA to 200 mA. Its hard breakdown knee and low dynamic impedance (21 Ω @ IZ = 5 mA) ensure minimal voltage deviation under transient current steps.
Designed for ambient temperatures from −55 °C to +150 °C, it features a junction-to-ambient thermal resistance of 500 K/W on FR4 PCB and supports non-repetitive 40 W surge pulses (100 μs square wave), enabling robust overvoltage clamp response in DC-DC converter input stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 27 V nominal at IZ = 5 mA; ±2 % tolerance ensures tight regulation for feedback sensing |
| Differential Resistance rdif | 21 Ω typical at IZ = 5 mA; low impedance maintains voltage stability under load transients |
| Temperature Coefficient SZ | −21.4 mV/K at IZ = 5 mA; predictable negative drift enables compensation in precision references |
| Reverse Current IR | 0.05 μA max at VR = 21.6 V; ultra-low leakage preserves accuracy in high-impedance bias networks |
| Total Power Dissipation Ptot | 250 mW at Tamb = 25 °C; derates linearly above 25 °C per 500 K/W thermal resistance |
| Non-repetitive Peak Power PZSM | 40 W for 100 μs pulse; enables single-event surge suppression without device failure |
| Forward Voltage VF | 0.9 V max at IF = 10 mA; defines forward conduction threshold in dual-direction protection circuits |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault conditions |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or via allowed |
| 3 | Cathode (K) | Connected to regulated output or reference node; provides Zener breakdown path to ground or supply rail |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct use in 1% feedback loops without external trimming resistors |
| Hard breakdown knee | Sharp transition into regulation reduces uncertainty in clamping threshold for overvoltage events |
| Ultra-low leakage (0.05 μA) | Minimizes error current in high-impedance voltage divider networks used with op-amp references |
| Optimized for low-current operation | Stable regulation down to 0.5 mA allows use in battery-powered standby circuits with microamp quiescent draw |
| SOT23 footprint compatibility | Matches industry-standard 3-pin SMT land pattern (0.6 mm pad width, 1.9 mm pitch) for seamless PCB reuse |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback or buck-boost converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Provides stable 27 V reference to TL431 shunt regulator or comparator input, defining primary-side voltage setpoint. Use Value: ±2 % tolerance and 21 Ω dynamic impedance reduce output voltage drift to < ±0.3 V across line/load/temperature. |
Use Scenario: Clamping transient surges on 24 V industrial bus lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Acts as passive crowbar element between bus and ground, conducting only when voltage exceeds 27.54 V (27 V + 2%). Use Value: 40 W non-repetitive surge rating absorbs 100 μs spikes without degradation, protecting downstream MOSFET gate drivers. |
| High-Impedance Analog Reference | Low-Power Sensor Biasing |
Use Scenario: Generating precision bias voltage for instrumentation amplifier inputs in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Supplies 27 V reference to resistor-divider network feeding op-amp non-inverting input, rejecting supply ripple. Use Value: 0.05 μA max leakage introduces < 1.3 nA error current into 2 MΩ divider, limiting offset error to < 2.6 μV. |
Use Scenario: Biasing thermistor or RTD measurement bridges in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Delivers stable excitation voltage to bridge arms while drawing < 1 μA quiescent current in sleep mode. Use Value: Regulation maintained down to 0.5 mA enables 27 V bias at 500 nA average current, extending 10-year coin-cell life. |
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-C27 | ±5 % tolerance, 30 Ω rdif @ 5 mA, −21 mV/K SZ, same SOT23 package | Higher voltage variation (±1.35 V vs. ±0.54 V) and higher impedance reduce regulation accuracy in precision feedback | Select when cost sensitivity outweighs 0.81 V tighter tolerance requirement and 9 Ω lower rdif is unnecessary |
| MMSZ5256B | ±5 % tolerance, 35 Ω rdif @ 20 mA, −2 mV/K SZ, SOD-123 package (larger footprint) | Positive temperature coefficient causes voltage rise with temperature-unsuitable for compensated references | Choose only for non-critical clamping where SOD-123 board space and thermal mass are acceptable trade-offs |
Compared with BZX84-C27 and MMSZ5256B, PZU84-B27R offers tighter tolerance, lower dynamic impedance, and a verified negative temperature coefficient-making it uniquely suitable for precision 27 V references requiring stability across −40 °C to +125 °C.
Availability
PZU84-B27R is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning circuits, and overvoltage protection systems requiring stable component supply with guaranteed long-term continuity.
Supply support for PZU84-B27R 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 high-volume, high-reliability discrete and logic devices, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered specifically for compact SMT designs needing accurate, low-leakage voltage references across wide temperature ranges.
FAQ
What is the maximum continuous reverse current the PZU84-B27R can sustain without exceeding its 250 mW power limit?
At 27 V Zener voltage, the absolute maximum continuous reverse current is 9.26 mA (250 mW ÷ 27 V). However, derating begins above 25 °C ambient-junction temperature must stay ≤150 °C, requiring current reduction by 0.5 mA/°C above 25 °C using the 500 K/W thermal resistance.
Does the 'R' suffix in PZU84-B27R indicate RoHS compliance or a packaging variant?
The 'R' suffix denotes tape-and-reel packaging per standard SOT23 carrier tape (EIA-481 compliant), not RoHS status. All PZU84 series devices are RoHS-compliant and halogen-free per Nexperia's product declaration-no separate marking is used for environmental compliance.
Can PZU84-B27R be used in forward-bias mode as a standard silicon diode?
Yes-it exhibits 0.9 V forward voltage at 10 mA, matching typical silicon diode behavior. However, its anode (pin 1) and cathode (pin 3) are asymmetrically optimized for reverse breakdown; forward conduction is secondary and not characterized beyond VF max, so it should not replace purpose-built rectifiers or switching diodes.
How does the 'B' series differ from the 'C' series in the PZU84 family for the same nominal voltage?
The 'B' series (e.g., PZU84-B27R) uses tighter ±2 % tolerance and targets low-leakage, high-precision applications, while the 'C' series (e.g., PZU84-C27) offers approximately ±5 % tolerance and is optimized for fast-switching and noise reduction via controlled leakage increase-making 'B' preferred for references and 'C' for transient clamping.
PZU84-B27R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PZU84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
PZU84-B27R FAQ
1.How can I place an order for PZU84-B27R through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B27R 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-B27R reliable?
The price and inventory of PZU84-B27R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B27R is usually 5 days.
3.What payment methods are accepted for PZU84-B27R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B27R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B27R?
PZU84-B27R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B27R 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-B27R?
For technical support, including PZU84-B27R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B27R requirements.
6.How does Aetrix verify that PZU84-B27R is sourced from the original manufacturer or authorized distributors?
All PZU84-B27R 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-B27R meets industry standards.
7.What is the process for return or replacement of PZU84-B27R?
All PZU84-B27R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B27R, 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-B27R part is unused and in its original packaging.
Return procedure for PZU84-B27R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B27R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
