My Inquiry
My Account
Nexperia USA Inc. PDZ18B-QZ
- Part No.:
- PDZ18B-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ18B-QZ.pdf
- Description:
- DIODE ZENER 18V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,081
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PDZ18B-QZ from Nexperia is a single Zener diode designed for precision voltage regulation in low-power automotive and industrial circuits, with a nominal Zener voltage of 17.56 V to 18.35 V at IZ = 5 mA, ±2 % tolerance, 80 Ω maximum differential resistance, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the PDZ18B-QZ datasheet, PDZ18B-QZ pinout, PDZ18B-QZ application, or PDZ18B-QZ equivalent, this device serves as a surface-mount voltage reference in power supply feedback loops, overvoltage clamping, and ESD-protected bias networks where stable 18 V regulation at low current (5 mA) and low leakage (<0.05 µA at VR = 13 V) are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a hard knee characteristic, enabling sharp regulation onset at its specified working voltage. Its thermal coefficient of +14.4 mV/K at IZ = 5 mA indicates positive temperature drift-critical for compensating other circuit elements with negative coefficients.
Designed for FR4 PCB mounting with standard SOD323 footprint, it delivers 400 mW total power dissipation at Tamb ≤ 25 °C and derates linearly above that, supported by Rth(j-a) = 340 K/W and Rth(j-sp) = 130 K/W thermal resistances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 17.56 V to 18.35 V at IZ = 5 mA - defines precise regulation point for feedback or clamp circuits |
| Differential Resistance rdif | ≤ 80 Ω at IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Reverse Leakage IR | ≤ 0.05 µA at VR = 13 V - enables ultra-low standby current in battery-sensitive designs |
| Power Dissipation Ptot | 400 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous power handling in standard layout |
| Forward Voltage VF | 0.9 V at IF = 10 mA - confirms low-loss forward conduction for dual-direction protection schemes |
| Temperature Coefficient SZ | +14.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree, essential for thermal stability analysis |
| Package | SOD323 (SC-76) - 2-pin surface-mount package with 1.35 mm × 0.8 mm footprint, cathode marked by bar |
Pinout & Package
SOD323 plastic surface-mounted package (SC-76), 2-terminal device with cathode identified by a marking bar on the top surface. Dimensions: 1.35 mm × 0.8 mm × 0.45 mm height; recommended reflow solder land size 0.6 mm × 0.5 mm per pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node or voltage reference point; polarity must match reverse-bias configuration |
| 2 (A) | Anode | Connected to ground or lower-potential rail; establishes correct bias direction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use up to 150 °C junction temperature and humidity exposure |
| Hard breakdown knee | Sharp, well-defined Zener transition enables reliable clamping without soft saturation effects |
| Low dynamic impedance | 80 Ω max at 5 mA supports tight regulation in feedback paths with varying load currents |
| Very low leakage | 0.05 µA max at 13 V reverse bias minimizes quiescent current in always-on monitoring circuits |
| ±2 % voltage tolerance | Reduces need for post-production trimming in voltage reference and sensing applications |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs in door module ECUs exposed to 12 V battery transients. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference, stabilizing 18 V rail feeding analog front-end circuitry. Use Value: Maintains <±10 mV regulation error across −40 °C to +125 °C ambient due to AEC-Q101 thermal validation and +14.4 mV/K coefficient predictability. |
Use Scenario: Clamping amplifier input to prevent overvoltage damage from 4–20 mA loop surges in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Reverse-biased Zener placed across op-amp input pins to limit common-mode voltage excursion. Use Value: 80 Ω dynamic impedance ensures clamped voltage stays within ±0.4 V of 18 V during 100 µs surge events, protecting downstream ICs. |
| USB-C Power Delivery Monitor | Smart Energy Meter Reference |
|
Use Scenario: Providing stable 18 V reference for voltage supervisor ICs monitoring VBUS during USB-C negotiation phases. IC Role / Device Role / Timing Role: Shunt regulator supplying clean bias to enable/disable logic in PD controller auxiliary circuits. Use Value: 0.05 µA leakage prevents measurable loading on high-impedance monitor nodes, preserving accuracy of ±0.5 % PD voltage detection. |
Use Scenario: Generating precision 18 V reference for metrology-grade ADCs measuring grid voltage harmonics in DIN-rail meters. IC Role / Device Role / Timing Role: Primary Zener reference in cascaded divider network feeding SAR ADC reference buffer. Use Value: ±2 % initial tolerance and predictable +14.4 mV/K drift allow software-based thermal compensation to achieve <0.1 % total reference error over full operating range. |
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-C18LT1G | Zener voltage 17.1–18.9 V (±5 %), 350 mW Ptot, no AEC-Q101 qualification | Not rated for automotive under-hood use; suitable only for commercial-grade consumer electronics | Select when cost sensitivity outweighs automotive reliability requirements and thermal drift control |
| MMSZ5245B-TP | Zener voltage 17.1–18.9 V (±5 %), 500 mW Ptot, 100 Ω rdif, no AEC-Q101 | Higher power but looser regulation and unqualified for automotive environments | Prefer for non-automotive industrial supplies needing higher surge margin but tolerating wider voltage spread |
Compared with BZX84-C18LT1G and MMSZ5245B-TP, PDZ18B-QZ offers tighter ±2 % tolerance, lower 80 Ω dynamic impedance, and AEC-Q101 certification-making it uniquely suited for automotive voltage references where long-term drift and environmental robustness are design-critical.
Availability
PDZ18B-QZ is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, USB-C power delivery monitors, and smart energy meter reference circuits requiring stable component supply with guaranteed long-term sourcing.
Supply support for PDZ18B-QZ 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 technologies.
PDZ-B-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for stable voltage reference and clamping in harsh-environment automotive and industrial power systems.
FAQ
What is the maximum reverse current IZSM rating for PDZ18B-QZ?
The non-repetitive peak reverse current is 1.5 A at tp = 100 µs, Tamb = 25 °C, verified per IEC 60134 limiting values. This rating supports transient overvoltage suppression in automotive load-dump scenarios when used with appropriate series impedance.
Does PDZ18B-QZ require a heatsink in standard FR4 PCB layouts?
No heatsink is required: at 400 mW dissipation and Rth(j-a) = 340 K/W, junction temperature rise is ~136 K above ambient-within the 150 °C absolute maximum when Tamb ≤ 14 °C. For higher ambient, derating per Figure 1 applies.
How is cathode polarity identified on the PDZ18B-QZ package?
The cathode (pin 1) is marked by a visible bar on the top surface of the SOD323 package. The anode (pin 2) is the unmarked terminal, consistent with Nexperia's standard SOD323 marking convention shown in Figure 8 and Table 2.
Can PDZ18B-QZ be used in bidirectional ESD protection configurations?
No-it is a single Zener diode optimized for unidirectional reverse-bias regulation. For bidirectional ESD protection, Nexperia recommends dedicated TVS arrays like PESD5V0S1BA; PDZ18B-QZ lacks symmetric clamping capability and has no specified ESD rating.
PDZ18B-QZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ18B-QZ FAQ
1.How can I place an order for PDZ18B-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ18B-QZ 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 PDZ18B-QZ reliable?
The price and inventory of PDZ18B-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ18B-QZ is usually 5 days.
3.What payment methods are accepted for PDZ18B-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ18B-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ18B-QZ?
PDZ18B-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ18B-QZ 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 PDZ18B-QZ?
For technical support, including PDZ18B-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ18B-QZ requirements.
6.How does Aetrix verify that PDZ18B-QZ is sourced from the original manufacturer or authorized distributors?
All PDZ18B-QZ 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 PDZ18B-QZ meets industry standards.
7.What is the process for return or replacement of PDZ18B-QZ?
All PDZ18B-QZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ18B-QZ, 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 PDZ18B-QZ part is unused and in its original packaging.
Return procedure for PDZ18B-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ18B-QZ 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…
