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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZT52H-A33X

Name: BZT52H-A33X
Brand: Nexperia USA Inc.
SKU: BZT52H-A33X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZT52H-A33X

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SOD-123F

Datasheet:: BZT52H-A33X.pdf

Description:: DIODE ZENER 33V 375MW SOD123F

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Product details

Overview

BZT52H-A33X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD123F package, rated for 33 V nominal breakdown voltage at I_Z = 2 mA, with 830 mW total power dissipation and 250 mA maximum forward current. It provides precision voltage reference and overvoltage protection in compact DC power rails and analog signal conditioning circuits.

For engineers reviewing the BZT52H-A33X datasheet, BZT52H-A33X pinout, BZT52H-A33X application, or BZT52H-A33X equivalent, this page delivers verified Zener parameters including V_Z = 32.67–33.33 V, r_dif ≤ 250 Ω, I_R ≤ 40 μA at V_R = 27 V, temperature coefficient of +0.05 mV/K, and thermal resistance R_th(j-sp) = 70 K/W - all critical for low-drift biasing and stable regulation design.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its precise Zener breakdown threshold. Its SOD123F package enables high-density PCB layout while supporting reflow soldering only.

The ±1 % V_Z tolerance (32.67–33.33 V), low differential resistance (≤250 Ω), and tightly controlled temperature coefficient (+0.05 mV/K) ensure minimal drift under thermal and current load changes - essential for reference-grade regulation in instrumentation and power management.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (nominal)	33 V - precise Zener breakdown voltage at I_Z = 2 mA, enabling accurate 33 V rail clamping or reference generation
V_Z tolerance	±1 % - guarantees actual breakdown between 32.67 V and 33.33 V, critical for tight-tolerance voltage supervision
P_tot	830 mW - maximum continuous power dissipation at T_amb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad, defining safe operating area
r_dif	≤250 Ω - low dynamic impedance ensures minimal output voltage variation under changing load current
I_R @ V_R = 27 V	≤40 μA - ultra-low leakage below breakdown, preserving efficiency in standby and low-power modes
T_j max	150 °C - maximum junction temperature limit, constraining thermal design margin for long-term reliability
R_th(j-sp)	70 K/W - thermal resistance from junction to cathode solder point, directly impacting temperature rise under load

Pinout & Package

SOD123F surface-mount plastic package: 2.5–2.7 mm length × 1.2–1.5 mm width × 0.9–1.1 mm height; cathode marked by bar on top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (K)	Connected to regulated output node; polarity-sensitive terminal where Zener conduction occurs during reverse bias
2	Anode (A)	Connected to ground or lower-potential rail; completes reverse-biased path for regulation current flow

Key Features

Feature	Design Value
±1 % V_Z tolerance	Enables direct replacement in precision reference designs without recalibration or resistor trimming
830 mW power rating	Supports higher regulation current than standard 500 mW Zeners, reducing need for external series resistors in 33 V clamp applications
SOD123F footprint	Compatible with automated pick-and-place and reflow processes; occupies <2.5 mm² board area for space-constrained layouts
+0.05 mV/K tempco	Minimizes voltage drift over industrial temperature range (−65 to +150 °C), improving stability in unregulated environments
250 mA I_F max	Allows use as dual-function device: forward-biased ESD clamp (0.9 V VF) and reverse-biased Zener regulator

Applications

Industrial Power Monitoring

Automotive Body Control Module

Use Scenario: Monitoring 33 V auxiliary battery rail in industrial PLC backplane to detect overvoltage faults.

IC Role / Device Role / Timing Role: Shunt regulator clamping input to 33 V reference, feeding comparator input for fault detection logic.

Use Value: ±1 % V_Z tolerance eliminates calibration overhead; 250 Ω r_dif ensures <0.5 V error across 2 mA sensing current.

Use Scenario: Providing stable 33 V reference for LIN transceiver biasing in door module ECUs.

IC Role / Device Role / Timing Role: Voltage reference source for internal LDO feedback divider, ensuring consistent bus-level timing margins.

Use Value: +0.05 mV/K tempco limits drift to <15 mV over −40 to +125 °C ambient, preserving LIN signal integrity.

Medical Sensor Signal Conditioning

Telecom DC-DC Feedback Network

Use Scenario: Biasing photodiode amplifier stages requiring low-noise, stable 33 V supply in portable ultrasound front-end.

IC Role / Device Role / Timing Role: Low-drift Zener reference establishing common-mode voltage for differential op-amp inputs.

Use Value: 40 μA I_R at 27 V prevents loading of high-impedance sensor nodes; SOD123F size avoids layout interference with RF sections.

Use Scenario: Setting output voltage of isolated flyback converter via optocoupler feedback network in PoE-powered switch.

IC Role / Device Role / Timing Role: Precision voltage reference in secondary-side error amplifier circuit, determining final regulated output accuracy.

Use Value: 830 mW P_tot accommodates transient surges without derating; 70 K/W R_th(j-sp) enables reliable operation at 75 °C board temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZT52H-B33	±2 % V_Z tolerance (32.3–33.7 V); identical SOD123F package and 830 mW rating	Acceptable where ±2 % regulation accuracy suffices, e.g., non-critical power sequencing	Select when cost sensitivity outweighs need for ±1 % precision; same thermal and layout compatibility
MMSZ5261B	±5 % V_Z (31.35–34.65 V); SOD-123 package (mechanically similar but not identical footprint)	Used in legacy consumer designs where wider tolerance and alternate sourcing are acceptable	Choose only if redesign allows footprint verification; lacks the 0.05 mV/K tempco and 250 Ω r_dif of BZT52H-A33X

Compared with BZT52H-B33 and MMSZ5261B, the BZT52H-A33X delivers superior voltage stability (±1 % vs. ±2 %/±5 %) and tighter thermal drift control (+0.05 mV/K), making it optimal for applications demanding repeatable 33 V references without post-production trimming.

Availability

BZT52H-A33X is available at Aetrix Electronics and suitable for industrial power monitoring, automotive body control modules, medical sensor signal conditioning, and telecom DC-DC feedback networks requiring stable component supply and guaranteed ±1 % Zener voltage accuracy.

Supply support for BZT52H-A33X 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, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for precision voltage regulation and overvoltage protection in space-constrained, thermally demanding SMD applications across industrial and consumer electronics.

FAQ

What is the exact Zener voltage range for BZT52H-A33X at 2 mA test current?

The BZT52H-A33X has a guaranteed Zener voltage range of 32.67 V to 33.33 V when measured at I_Z = 2 mA and T_j = 25 °C, per Table 9 of the official Nexperia datasheet Rev. 7. This ±1 % tolerance is confirmed across production lots and validated under standard test conditions with pulse testing (t_p ≤ 300 μs).

Can BZT52H-A33X be used in place of older BZT52C33 devices?

No - BZT52H-A33X and BZT52C33 differ in tolerance (±1 % vs. ±5 %), differential resistance (≤250 Ω vs. ≤400 Ω), and temperature coefficient (+0.05 mV/K vs. +0.05 mV/K but with different test current dependency). While both regulate near 33 V, the A-grade part offers tighter specs and is not a drop-in replacement without verifying system-level voltage margin and thermal behavior.

What is the maximum allowable continuous reverse current for stable 33 V regulation?

At T_amb = 25 °C on an FR4 PCB with 1 cm² cathode pad, the maximum continuous reverse current is derived from P_tot = 830 mW and V_Z ≈ 33 V, yielding I_Z(max) ≈ 25 mA. Exceeding this risks exceeding T_j = 150 °C; derating is required above 25 °C ambient per R_th(j-a) = 330 K/W.

Does BZT52H-A33X meet automotive qualification standards?

No - the BZT52H-A33X is explicitly designated as non-automotive qualified per Nexperia's Revision History (Rev. 7, Jan 2023), which states "Products changed to non-automotive qualification." For automotive applications, Nexperia offers separate -Q qualified variants (e.g., BZT52H-A33X-Q), which undergo AEC-Q200 stress testing and have distinct part numbering and documentation.

BZT52H-A33X Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZT52H

Package/Case:: SOD-123F

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 33 V

Tolerance:: ±1%

Power - Max:: 375 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:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123F

BZT52H-A33X FAQ

1.How can I place an order for BZT52H-A33X through Aetrix?

Please submit a Request for Quotation (RFQ) for BZT52H-A33X 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 BZT52H-A33X reliable?

The price and inventory of BZT52H-A33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-A33X is usually 5 days.

3.What payment methods are accepted for BZT52H-A33X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A33X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZT52H-A33X?

BZT52H-A33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZT52H-A33X 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 BZT52H-A33X?

For technical support, including BZT52H-A33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A33X requirements.

6.How does Aetrix verify that BZT52H-A33X is sourced from the original manufacturer or authorized distributors?

All BZT52H-A33X 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 BZT52H-A33X meets industry standards.

7.What is the process for return or replacement of BZT52H-A33X?

All BZT52H-A33X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A33X, 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 BZT52H-A33X part is unused and in its original packaging.

Return procedure for BZT52H-A33X:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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