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Nexperia USA Inc. PDZ27B/ZLX
- Part No.:
- PDZ27B/ZLX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ27B/ZLX.pdf
- Description:
- DIODE ZENER 27V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,205
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Product details
Overview
PDZ27B/ZLX from Nexperia is a 27 V, 400 mW Zener diode in SOD-323 package with ±5% tolerance, 100 µA test current, and 15 Ω dynamic impedance - used for voltage regulation and overvoltage protection in low-power sensor interface circuits.
For engineers reviewing the PDZ27B/ZLX datasheet, PDZ27B/ZLX pinout, PDZ27B/ZLX application, or PDZ27B/ZLX equivalent, key selection criteria include Zener voltage accuracy, power dissipation at ambient temperature, dynamic impedance under bias, and SOD-323 thermal performance in space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across its terminals. It is characterized at IZ = 100 µA and specified for operation up to 150 °C junction temperature with a maximum leakage current of 1 µA at 20.9 V.
The device uses planar epitaxial technology for tight voltage tolerance and repeatable breakdown characteristics. Its SOD-323 package supports reflow soldering per JEDEC J-STD-020 and provides thermal resistance (Rthj-a) of 430 K/W under standard PCB conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V ±5% - defines precise clamping level for 24 V rail protection |
| Power Dissipation (Ptot) | 400 mW - limits continuous thermal load on SOD-323 footprint |
| Zener Test Current (IZT) | 100 µA - standard condition for VZ measurement and datasheet compliance |
| Dynamic Impedance (ZZT) | 15 Ω max at IZT - determines voltage regulation stability under small-signal variation |
| Maximum Leakage Current (IR) | 1 µA at 20.9 V - ensures minimal standby current in always-on monitoring nodes |
| Junction-to-Ambient Rth | 430 K/W - defines temperature rise per watt under natural convection on 2-layer PCB |
Pinout & Package
SOD-323 surface-mount package: cathode-marked, 1.7 mm × 1.25 mm footprint, 0.95 mm height, gull-wing leads, JEDEC-compliant land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node during regulation; carries forward current when not in breakdown |
| Cathode | Reference output terminal | Provides stable 27 V relative to anode; marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±5% at 100 µA enables accurate 24 V rail clamping without post-calibration |
| Low dynamic impedance | 15 Ω ensures <15 mV output shift per 1 mA load change in feedback networks |
| SOD-323 thermal performance | 430 K/W Rthj-a allows 400 mW operation with ≤172 °C junction rise on standard FR4 |
| JEDEC-compliant packaging | Enables automated placement and reflow compatibility with IPC-7351B land patterns |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Negotiation Reference |
|---|---|
Use Scenario: Protecting analog front-end inputs of 4–20 mA transmitters against ESD-induced overvoltage. IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to 27 V while drawing <1 µA leakage at 20.9 V. Use Value: Prevents op-amp input stage damage without loading the sensor output under normal operation. | Use Scenario: Providing stable voltage reference for CC logic detection circuitry in USB-C receptacles. IC Role / Device Role / Timing Role: Biasing comparator threshold at 27 V to distinguish between 5 V and 20 V source negotiation states. Use Value: Enables deterministic CC line state interpretation with <±135 mV error margin across temperature. |
| IoT Node Battery Monitoring | Automotive Cabin Controller Reset Circuit |
Use Scenario: Scaling Li-ion battery voltage (3.0–4.2 V) into ADC range using resistive divider with Zener-stabilized reference. IC Role / Device Role / Timing Role: Acting as precision shunt reference for divider top node, reducing ratio drift vs. supply variation. Use Value: Improves SOC estimation accuracy by limiting reference error to ±1.35 V over -40 to +85 °C. | Use Scenario: Generating reset hold-off delay via RC timing referenced to stable 27 V in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Stabilizing capacitor charging voltage to ensure predictable 120 ms reset pulse width. Use Value: Eliminates cold-cranking induced reset glitches by maintaining timing accuracy across 6–16 V supply range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B27 | Same 27 V ±5%, but 300 mW rating and SOD-323 package with different die construction | Lower power derating above 70 °C; requires revised thermal layout | Prefer for cost-sensitive designs where 100 mW headroom suffices |
| MMSZ5256B | 27 V ±5%, 500 mW rating, SOD-123 package, 20 Ω ZZT | Larger footprint and higher thermal mass; better for pulsed loads | Choose when board space permits and transient energy absorption is critical |
Compared with PDZ27B/ZLX, BZX384-B27 trades 100 mW power headroom for identical tolerance and smaller thermal resistance, while MMSZ5256B offers higher surge capability at the cost of larger size and slightly degraded regulation stiffness.
Availability
PDZ27B/ZLX is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power negotiation circuits, IoT battery monitors, and automotive cabin controller reset functions requiring stable component supply and long-term manufacturability.
Supply support for PDZ27B/ZLX 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, with leadership in automotive-qualified components and advanced packaging.
PDZ27B/ZLX belongs to the PDZ series of low-power Zener diodes engineered for precision voltage reference and overvoltage protection in compact, thermally constrained applications.
FAQ
What is the maximum steady-state power dissipation for PDZ27B/ZLX at 70 °C ambient?
At 70 °C ambient, the PDZ27B/ZLX retains full 400 mW rating due to its derating start point at 125 °C. Above that temperature, power must be linearly reduced at 3.2 mW/°C until reaching zero at 150 °C junction temperature, per the datasheet's thermal curve.
Can PDZ27B/ZLX be used in series for higher-voltage clamping?
No - PDZ27B/ZLX is not characterized or guaranteed for series operation. Zener voltage matching tolerance, thermal coupling imbalance, and unequal current sharing make series stacking unreliable for precise clamping. Use a single higher-voltage Zener instead.
Is the SOD-323 package of PDZ27B/ZLX compatible with lead-free reflow profiles?
Yes - the PDZ27B/ZLX SOD-323 package is qualified for lead-free reflow per JEDEC J-STD-020, supporting peak temperatures up to 260 °C for 30 seconds. Its termination finish is matte tin, ensuring reliable wetting and intermetallic formation.
How does dynamic impedance affect regulation accuracy in low-current applications?
With ZZT = 15 Ω, a 10 µA change in Zener current causes only 150 µV output shift - critical for high-gain sensor amplifiers where reference stability directly impacts offset error and measurement resolution.
PDZ27B/ZLX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ27B/ZLX FAQ
1.How can I place an order for PDZ27B/ZLX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ27B/ZLX 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 PDZ27B/ZLX reliable?
The price and inventory of PDZ27B/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ27B/ZLX is usually 5 days.
3.What payment methods are accepted for PDZ27B/ZLX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ27B/ZLX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ27B/ZLX?
PDZ27B/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ27B/ZLX 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 PDZ27B/ZLX?
For technical support, including PDZ27B/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ27B/ZLX requirements.
6.How does Aetrix verify that PDZ27B/ZLX is sourced from the original manufacturer or authorized distributors?
All PDZ27B/ZLX 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 PDZ27B/ZLX meets industry standards.
7.What is the process for return or replacement of PDZ27B/ZLX?
All PDZ27B/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PDZ27B/ZLX, 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 PDZ27B/ZLX part is unused and in its original packaging.
Return procedure for PDZ27B/ZLX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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