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Nexperia USA Inc. PDZ33BZ
- Part No.:
- PDZ33BZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ33BZ.pdf
- Description:
- DIODE ZENER 33V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,962
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Product details
Overview
PDZ33BZ from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in surface-mounted applications, with a nominal Zener voltage of 33 V (min 32.15 V, max 33.79 V at IZ = 5 mA), dynamic impedance of 250 Ω at IZ = 0.5 mA, reverse current ≤ 0.05 μA at VR = 25 V, and total power dissipation up to 400 mW on FR4 PCB.
For engineers reviewing the PDZ33BZ datasheet, PDZ33BZ pinout, PDZ33BZ application, or PDZ33BZ equivalent, this device is selected for precision reference generation, overvoltage clamping in low-current analog circuits, and supply rail stabilization where tight voltage tolerance (±2 %), low leakage, and hard breakdown knee are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a temperature coefficient of +29.7 mV/K at IZ = 5 mA, indicating positive thermal drift - critical for biasing networks requiring predictable voltage shift across temperature. Its SOD323 package delivers Rth(j-a) = 340 K/W and Rth(j-sp) = 130 K/W, enabling stable operation up to Tj = +150 °C when mounted on standard FR4 with tin-plated copper.
The device exhibits hard breakdown characteristics and low leakage (<0.05 μA), making it suitable for high-impedance sensing nodes and battery-powered voltage references. Forward voltage is specified at 0.9 V (IF = 10 mA) and 1.1 V (IF = 100 mA), supporting bidirectional protection use cases when combined with external series components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 32.15 V to 33.79 V at IZ = 5 mA - defines precise clamping threshold for 33 V nominal rail regulation |
| Differential Resistance rdif | 250 Ω at IZ = 0.5 mA - determines output impedance and regulation sensitivity under light load |
| Reverse Current IR | ≤ 0.05 μA at VR = 25 V - ensures minimal quiescent power loss in high-impedance reference paths |
| Total Power Dissipation Ptot | 400 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous Zener current limit (~12 mA at 33 V) |
| Thermal Resistance Rth(j-a) | 340 K/W - quantifies self-heating impact; derates to ~200 mW at 70 °C ambient |
| Forward Voltage VF | 0.9 V at IF = 10 mA - enables use as low-drop rectifier or ESD path in dual-direction configurations |
Pinout & Package
PDZ33BZ is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode indicated by a marking bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-biased during Zener operation; marking bar identifies this terminal |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference or clamping function |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance at low current | 250 Ω @ IZ = 0.5 mA - improves regulation stability in micro-power sensor biasing |
| Hard breakdown knee | Sharp transition from non-conduction to full Zener conduction - reduces uncertainty in clamping onset voltage |
| Very low reverse leakage | ≤ 0.05 μA @ VR = 25 V - preserves signal integrity in high-impedance feedback networks |
| Tight voltage tolerance | ±2 % nominal VZ - eliminates need for post-production trimming in cost-sensitive consumer power supplies |
| SOD323 footprint compatibility | Standard reflow/wave solder land pattern per Fig. 9–10 - supports automated assembly without custom stencil design |
Applications
| Power Supply Rail Clamp | ADC Reference Stabilizer |
|---|---|
|
Use Scenario: Clamping 3.3 V or 5 V logic supply rails against transient overvoltage events in industrial I/O modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess current above rated rail voltage. Use Value: Limits voltage excursion to ≤33.8 V with <0.05 μA leakage, preventing latch-up in downstream CMOS ICs without loading the source. |
Use Scenario: Providing a stable 33 V reference for 12-bit SAR ADC input scaling in battery-powered data loggers. IC Role / Device Role / Timing Role: Precision voltage reference element in resistive divider network feeding ADC VREF pin. Use Value: Delivers ±2 % initial accuracy and +29.7 mV/K TC, enabling calibrated offset compensation across −40 °C to +85 °C operating range. |
| Microcontroller Reset Circuit | Optocoupler Bias Network |
|
Use Scenario: Generating a clean reset pulse for ARM Cortex-M0+ MCUs during brown-out conditions in smart meter designs. IC Role / Device Role / Timing Role: Zener-based threshold detector in RC delay network triggering active-low reset assertion. Use Value: Hard breakdown knee ensures deterministic turn-on at 32.15 V, minimizing jitter in reset timing across unit-to-unit variation. |
Use Scenario: Biasing the LED side of linear optocouplers (e.g., IL300) in isolated analog signal transmission paths. IC Role / Device Role / Timing Role: Constant-voltage source maintaining fixed forward current through optocoupler LED. Use Value: 250 Ω dynamic impedance stabilizes LED current against supply ripple, improving linearity and CTR consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B33 | Same VZ range (31.35–34.65 V), but higher IR (≤1.0 μA @ 25 V) and larger SOD-323 variant footprint (SOD-323F) | Less suitable for ultra-low-leakage bias networks; acceptable for general-purpose clamp where leakage >0.1 μA is tolerable | Select when legacy BOM alignment or distributor stock availability outweighs leakage sensitivity |
| MMSZ5261B | VZ = 33 V (31.35–34.65 V), but higher Ptot = 500 mW and larger SOD-123 package (2.7 × 1.6 mm) | Better thermal performance in high-ambient environments; incompatible with dense SOD323 layouts | Choose when board space permits larger footprint and >400 mW dissipation margin is required |
Compared with BZX384-B33 and MMSZ5261B, PDZ33BZ offers the lowest reverse leakage and smallest footprint among 33 V Zeners, making it optimal for space-constrained, low-power analog reference and clamping functions where leakage <0.1 μA and board area <2.5 mm² are design constraints.
Availability
PDZ33BZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical monitors, and IoT edge node power management requiring stable component supply with guaranteed long-term sourcing.
Supply support for PDZ33BZ 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 leading Dutch semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with core expertise in automotive-qualified and industrial-grade components.
The PDZ-B series targets cost-sensitive, space-constrained voltage regulation in consumer, computing, and industrial electronics - emphasizing tight tolerance, low leakage, and robust SMD manufacturability.
FAQ
What is the maximum continuous Zener current for PDZ33BZ at 25 °C ambient?
At Tamb = 25 °C on standard FR4 PCB, PDZ33BZ supports up to ~12.1 mA continuous Zener current (400 mW ÷ 33 V), assuming nominal VZ. Derating begins above 25 °C per Fig. 1, reaching ~6.5 mA at 70 °C ambient due to Rth(j-a) = 340 K/W.
Does PDZ33BZ have automotive qualification?
No. PDZ33BZ is not AEC-Q200 qualified and is intended for industrial, consumer, and computing applications only. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products are unsuitable for safety-critical or automotive use without additional customer validation.
How is cathode polarity identified on the PDZ33BZ package?
The cathode (K) is marked by a visible bar on the top surface of the SOD323 package, aligned with Pin 1 per Table 2 and Fig. 8. This matches the simplified outline showing Pin 1 as K and Pin 2 as A, confirmed in both pinning and package outline sections of the datasheet.
Can PDZ33BZ be used in forward conduction mode?
Yes - its forward voltage is characterized at 0.9 V (IF = 10 mA) and 1.1 V (IF = 100 mA). It can serve as a low-VF series diode in protection circuits, though its primary design intent and characterization focus remain reverse-bias Zener regulation.
PDZ33BZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 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
PDZ33BZ FAQ
1.How can I place an order for PDZ33BZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ33BZ 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 PDZ33BZ reliable?
The price and inventory of PDZ33BZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ33BZ is usually 5 days.
3.What payment methods are accepted for PDZ33BZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ33BZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ33BZ?
PDZ33BZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ33BZ 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 PDZ33BZ?
For technical support, including PDZ33BZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ33BZ requirements.
6.How does Aetrix verify that PDZ33BZ is sourced from the original manufacturer or authorized distributors?
All PDZ33BZ 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 PDZ33BZ meets industry standards.
7.What is the process for return or replacement of PDZ33BZ?
All PDZ33BZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ33BZ, 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 PDZ33BZ part is unused and in its original packaging.
Return procedure for PDZ33BZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ33BZ Tags
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MM5Z5V1ST1G
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