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

Diodes Incorporated BZT52C3V9SQ-7-F

Name: BZT52C3V9SQ-7-F
Brand: Diodes Incorporated
SKU: BZT52C3V9SQ-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZT52C3V9SQ-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: BZT52C3V9SQ-7-F.pdf

Description:: DIODE ZENER 3.9V 200MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:2,430

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Product details

Overview

BZT52C3V9SQ-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 3.9 V (±5%), 200 mW power dissipation, and SOD323 package. It provides precise voltage regulation in low-power biasing, reference, and overvoltage protection circuits for automotive and industrial control modules.

For engineers reviewing the BZT52C3V9SQ-7-F datasheet, BZT52C3V9SQ-7-F pinout, BZT52C3V9SQ-7-F application, or BZT52C3V9SQ-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), low reverse leakage (≤3 µA at 1.0 V), temperature coefficient (−3.5 to 0 mV/°C), and AEC-Q101 qualification for automotive reliability.

Technical Context

This Zener diode operates in reverse breakdown mode with a test current of 5 mA and exhibits low dynamic impedance (90 Ω typical at 5 mA). Its planar die construction ensures stable voltage regulation across temperature and lifetime.

The device features a cathode band polarity marker, matte tin-plated alloy 42 leadframe, and UL 94V-0 molded plastic case. It is rated for operation from −65 °C to +150 °C and qualified to AEC-Q101 for high-reliability automotive applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.9 V nominal, 3.7–4.1 V range at I_ZT = 5 mA - defines regulation threshold in precision reference circuits
Power Dissipation (P_D)	200 mW - limits continuous power handling on standard FR-4 PCB with recommended pad layout
Zener Impedance (Z_ZT)	90 Ω max at 1 kHz, 5 mA - determines regulation stability under varying load current
Reverse Leakage (I_R)	≤3 µA at V_R = 1.0 V - ensures minimal quiescent current in battery-powered sensing nodes
Temperature Coefficient	−3.5 to 0 mV/°C - enables predictable drift compensation in temperature-sensitive references
Package	SOD323 - 1.3 × 1.7 mm footprint supports high-density PCB layouts and automated placement

Pinout & Package

Package: SOD323 surface-mount plastic case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.0049 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference node	Connected to lower-potential side in reverse-bias regulation configuration
Cathode	Zener breakdown terminal / voltage reference output	Marked by band; supplies regulated voltage when reverse biased above 3.9 V

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing
Lead-free & RoHS compliant	Fully EU Directive 2011/65/EU compliant with <900 ppm Br/Cl and <1000 ppm Sb
Low thermal resistance	R_θJA = 625 °C/W - enables operation up to +150 °C ambient with derated power
Automated assembly compatible	SOD323 footprint and matte tin plating support reflow soldering per J-STD-020 Level 1

Applications

Automotive Body Control Module (BCM)

Industrial Sensor Signal Conditioning

Use Scenario: Voltage clamping for LIN bus transceiver input protection against load dump transients.

IC Role / Device Role / Timing Role: Zener clamp protecting 3.3 V logic interface from >12 V surges.

Use Value: Limits transient voltage to ≤4.1 V while drawing <3 µA at standby, preserving low-power sleep mode integrity.

Use Scenario: Precision 3.9 V reference for 12-bit ADC biasing in RTD temperature measurement circuits.

IC Role / Device Role / Timing Role: Stable shunt reference providing excitation and scaling reference.

Use Value: ±5% voltage tolerance and −3.5 mV/°C TC enable <0.2% full-scale error over −40 to +125 °C.

Consumer IoT Power Management

Medical Diagnostic Equipment Biasing

Use Scenario: Overvoltage protection for coin-cell powered BLE microcontroller reset circuitry.

IC Role / Device Role / Timing Role: Reverse-biased shunt regulator holding reset line at 3.9 V during brown-out recovery.

Use Value: 200 mW rating and 90 Ω Z_ZT ensure fast response to supply spikes without latch-up or thermal runaway.

Use Scenario: Low-noise bias source for op-amp front-end stages in portable ECG signal amplifiers.

IC Role / Device Role / Timing Role: Low-leakage (<3 µA) voltage reference stabilizing gain-setting networks.

Use Value: Minimal reverse current prevents DC offset drift in high-impedance analog paths, maintaining ≥86 dB CMRR.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5227BS-7-F	Zener voltage 3.6 V (±5%), 350 mW P_D, SOT-23 package	Higher power rating but larger footprint; not AEC-Q101 qualified	Select for non-automotive designs requiring higher surge margin and board space availability
BZX384-C3V9,115	Zener voltage 3.9 V (±5%), 300 mW P_D, SOD-323 package, no AEC-Q101 qualification	Same footprint and voltage but lacks automotive reliability validation	Prefer for cost-sensitive consumer applications where AEC-Q101 is not mandated

Compared with MMBZ5227BS-7-F and BZX384-C3V9,115, BZT52C3V9SQ-7-F uniquely combines AEC-Q101 qualification, SOD323 size, and 3.9 V regulation in a single automotive-grade solution-critical for BCM, ADAS sensor hubs, and engine control submodules requiring zero-failure field performance.

Availability

BZT52C3V9SQ-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for BZT52C3V9SQ-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BZT52C series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage regulation, transient suppression, and reference generation in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage (V_R) before significant leakage occurs?

At V_R = 1.0 V, reverse current is guaranteed ≤3 µA. Leakage rises to ≤10 µA at V_R = 2.0 V per datasheet Fig. 2. Operation above 3.7 V enters breakdown region; sustained reverse bias below 3.7 V maintains sub-microamp leakage essential for battery-critical systems.

Is BZT52C3V9SQ-7-F compatible with lead-free reflow profiles?

Yes. The device uses matte tin finish over alloy 42 leadframe and is qualified for Pb-free reflow per J-STD-020. Peak temperature tolerance is 260 °C for 10 seconds, matching standard SAC305 profile requirements without degradation to Zener characteristics or mechanical integrity.

How does the −3.5 mV/°C temperature coefficient affect accuracy over temperature?

Over −40 °C to +125 °C, total drift is ≤0.58 V (165 °C × 3.5 mV/°C), resulting in ~15% relative shift from 3.9 V nominal. For precision use, this requires either TC compensation in circuit design or selection of tighter-tolerance variants like BZT52C3V9S (same TC, tighter V_Z bin).

Can this Zener be used in series for higher-voltage regulation?

No. Series connection introduces mismatched temperature coefficients and dynamic impedances, causing uneven voltage division and thermal runaway risk. For >4.1 V regulation, use a single higher-voltage Zener (e.g., BZT52C5V1S) or a dedicated voltage reference IC with built-in thermal tracking.

BZT52C3V9SQ-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.9 V

Tolerance:: ±5.13%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323

BZT52C3V9SQ-7-F FAQ

1.How can I place an order for BZT52C3V9SQ-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZT52C3V9SQ-7-F 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 BZT52C3V9SQ-7-F reliable?

The price and inventory of BZT52C3V9SQ-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C3V9SQ-7-F is usually 5 days.

3.What payment methods are accepted for BZT52C3V9SQ-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C3V9SQ-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZT52C3V9SQ-7-F?

BZT52C3V9SQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZT52C3V9SQ-7-F 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 BZT52C3V9SQ-7-F?

For technical support, including BZT52C3V9SQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C3V9SQ-7-F requirements.

6.How does Aetrix verify that BZT52C3V9SQ-7-F is sourced from the original manufacturer or authorized distributors?

All BZT52C3V9SQ-7-F 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 BZT52C3V9SQ-7-F meets industry standards.

7.What is the process for return or replacement of BZT52C3V9SQ-7-F?

All BZT52C3V9SQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C3V9SQ-7-F, 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 BZT52C3V9SQ-7-F part is unused and in its original packaging.

Return procedure for BZT52C3V9SQ-7-F:

1.Submit a request within 90 days.

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

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