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Nexperia USA Inc. BZT52-C33X
- Part No.:
- BZT52-C33X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C33X.pdf
- Description:
- DIODE ZENER 33V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,441
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Product details
Overview
BZT52-C33X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 33 V nominal Zener voltage at IZ = 2 mA, 250 mA maximum forward current, and 590 mW total power dissipation at Tamb ≤ 25 °C - used for precision voltage reference and overvoltage clamping in low-power analog signal conditioning circuits.
For engineers reviewing the BZT52-C33X datasheet, BZT52-C33X pinout, BZT52-C33X application, or BZT52-C33X equivalent, key selection criteria include Zener voltage tolerance (±5 %), differential resistance (250 Ω max), reverse leakage (≤ 0.05 μA at VR = 26.4 V), thermal resistance (210 K/W junction-to-solder point), and SOD123 surface-mount compatibility with standard reflow profiles.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 33 V nominal Zener voltage is specified at 2 mA test current, with a temperature coefficient of +0.05 mV/K at IZ = 5 mA, indicating minimal drift over temperature.
The device exhibits low differential resistance (≤ 250 Ω) and low reverse leakage (≤ 0.05 μA at 80 % of VZ), enabling accurate regulation in low-current bias networks and protection circuits where tight voltage control and minimal quiescent error are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 31.0 V to 35.0 V at IZ = 2 mA - defines clamping threshold for overvoltage protection and reference accuracy in feedback loops. |
| Differential Resistance rdif | ≤ 250 Ω - determines regulation stiffness; lower values reduce output voltage variation under load changes. |
| Reverse Leakage IR | ≤ 0.05 μA at VR = 26.4 V - ensures minimal standby current in high-impedance sensing or battery-powered bias networks. |
| Total Power Dissipation Ptot | 590 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on FR4 PCB with 1 cm² cathode pad. |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - enables use as low-drop rectifier or polarity indicator in dual-function circuits. |
| Junction Temperature Tj | −55 °C to +150 °C - supports operation in industrial ambient environments without derating below −40 °C. |
Pinout & Package
Package: SOD123 - surface-mount plastic package with 2 leads, 2.80 mm × 1.70 mm footprint, 1.30 mm height, and cathode-marking band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking band identifies this terminal for correct PCB orientation and polarity-sensitive placement. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction during Zener operation. |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tighter tolerances are unnecessary, reducing BOM cost vs. ±2 % B-series variants. |
| Low differential resistance (≤ 250 Ω) | Maintains <±100 mV regulation error across 0.5–5 mA load current range, suitable for op-amp reference buffers. |
| SOD123 package with standard reflow footprint | Supports automated assembly on high-density PCBs using IPC-7351-compliant land pattern (2.36 mm × 1.11 mm solder pad). |
| Non-repetitive peak reverse power: 40 W | Withstands transient surges up to 100 μs duration, providing robust ESD and lightning-induced spike suppression in sensor interfaces. |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC input scaling in temperature transmitters. IC Role / Device Role / Timing Role: Zener diode provides fixed 33 V reference to resistive divider network feeding ADC VREF pin. Use Value: ±5 % tolerance and 250 Ω rdif limit reference error to <±1.65 V across operating temperature, preserving 0.1 °C measurement resolution. |
Use Scenario: Clamping GPIO pins against ESD events exceeding IEC 61000-4-2 Level 4 (8 kV contact discharge). IC Role / Device Role / Timing Role: Reverse-biased BZT52-C33X shunts transient energy to ground before it reaches MCU input protection diodes. Use Value: 40 W non-repetitive surge rating absorbs 8 kV/150 pF pulses without degradation, extending system field life beyond 100,000 insertion cycles. |
| Low-Power Battery Monitor Circuit | Programmable Logic Supply Rail Clamp |
Use Scenario: Detecting end-of-life voltage drop in 36 V LiFePO4 battery packs using comparator-based cutoff. IC Role / Device Role / Timing Role: Zener establishes 33 V threshold at comparator inverting input; battery voltage feeds non-inverting input via resistor divider. Use Value: 0.05 μA reverse leakage draws <1 nA from monitoring circuit, enabling >10-year shelf life in maintenance-free remote sensors. |
Use Scenario: Preventing FPGA I/O bank overvoltage during hot-swap of daughter cards with mismatched supply sequencing. IC Role / Device Role / Timing Role: Connected between 3.3 V I/O rail and ground to clamp transients above 33 V caused by inductive coupling or backfeed. Use Value: 210 K/W Rth(j-sp) allows safe dissipation of 100 ms 1 A surge without exceeding 150 °C junction temperature, avoiding latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52-B33 | ±2 % VZ tolerance (32.3–33.7 V), lower rdif (≤ 170 Ω) | Higher precision needed in feedback loops requiring <±0.5 % output stability | Select when regulation accuracy outweighs cost sensitivity; requires same SOD123 layout. |
| MMBZ5265BLT1G | 33 V nominal, ±5 %, SOT-23 package, 350 mW Ptot | Higher board density required; lower power handling limits surge immunity | Choose only if space-constrained designs preclude SOD123; verify thermal relief on 0.5 mm pitch pads. |
Compared with BZT52-B33, the BZT52-C33X trades tighter voltage tolerance for lower unit cost and identical package fit; versus MMBZ5265BLT1G, it delivers 68 % higher power rating and superior thermal performance in PCB-mounted applications.
Availability
BZT52-C33X is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller I/O protection, and low-power battery monitor circuits requiring stable component supply with full traceability and no minimum order quantity.
Supply support for BZT52-C33X 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 and industrial-grade components.
The BZT52 series targets general-purpose voltage regulation and protection in cost-sensitive, space-constrained applications - designed for broad compatibility across consumer, industrial, and computing systems without automotive qualification requirements.
FAQ
What is the Zener test current for BZT52-C33X?
The nominal Zener voltage of 33 V is specified at IZ = 2 mA, per Table 9 in the datasheet. This test condition ensures consistent characterization across the C-series family and aligns with industry-standard measurement practices for mid-voltage Zeners.
Can BZT52-C33X be used in place of a 33 V TVS diode?
No - BZT52-C33X is a Zener regulator diode optimized for steady-state voltage reference and low-current clamping, not transient suppression. It lacks the low clamping voltage (VC) and high peak pulse current (IPP) ratings required for TVS applications per IEC 61000-4-5.
What is the maximum allowable PCB copper area for cathode thermal relief?
The 590 mW power rating assumes a 1 cm² tin-plated copper pad on FR4 single-sided board for the cathode terminal (Table 5, Note [3]). Larger pads improve thermal performance but require matching solder mask openings to avoid bridging during reflow.
Does BZT52-C33X meet automotive AEC-Q200 requirements?
No - this part is explicitly marked as non-automotive qualified in the revision history (Section 13). For automotive applications, Nexperia offers the -Q qualified BZT52-B33-Q variant with extended temperature testing and failure analysis reporting.
BZT52-C33X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6.1%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52-C33X FAQ
1.How can I place an order for BZT52-C33X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C33X 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 BZT52-C33X reliable?
The price and inventory of BZT52-C33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C33X is usually 5 days.
3.What payment methods are accepted for BZT52-C33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C33X?
BZT52-C33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C33X 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 BZT52-C33X?
For technical support, including BZT52-C33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C33X requirements.
6.How does Aetrix verify that BZT52-C33X is sourced from the original manufacturer or authorized distributors?
All BZT52-C33X 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 BZT52-C33X meets industry standards.
7.What is the process for return or replacement of BZT52-C33X?
All BZT52-C33X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C33X, 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 BZT52-C33X part is unused and in its original packaging.
Return procedure for BZT52-C33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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