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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Zener Diode Arrays

Diodes Incorporated AZ23C51-7-F

Name: AZ23C51-7-F
Brand: Diodes Incorporated
SKU: AZ23C51-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AZ23C51-7-F

Manufacturer:: Diodes Incorporated

Category:: Zener Diode Arrays

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AZ23C51-7-F.pdf

Description:: DIODE ZENER ARRAY 51V SOT23-3

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Inventory:5,858

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Product details

Overview

AZ23C51-7-F from Diodes Incorporated is a dual common-anode 300 mW surface-mount Zener diode with nominal Zener voltage 51 V (48–54 V range), 100 Ω maximum Zener impedance at 5 mA, +0.110 %/°C temperature coefficient, and 38 V minimum reverse voltage - used for precision voltage reference and overvoltage protection in power supply feedback loops and industrial sensor interfaces.

For engineers reviewing the AZ23C51-7-F datasheet, AZ23C51-7-F pinout, AZ23C51-7-F application, or AZ23C51-7-F equivalent, key selection criteria include dual-Zener matching tolerance (≤5% ΔV_Z), SOT23 thermal resistance (417 °C/W), JEDEC-qualified reliability, and automotive-grade availability via Q-suffix variants.

Technical Context

This dual Zener operates in common-anode configuration: both cathodes are electrically isolated, enabling independent clamping or bidirectional reference generation. It supports stable regulation under 5 mA test current with low dynamic impedance and tightly controlled voltage drift across -65 °C to +150 °C.

The device meets AEC-Q101 stress testing (HBM ESD 8 kV, IEC 61000-4-2 contact discharge 8 kV) and is qualified per JEDEC high-reliability standards. Its SOT23 package uses matte tin-plated Alloy 42 leadframe and green molding compound rated UL 94V-0.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage Range	48 V to 54 V - defines usable regulation window for 51 V nominal design; enables ±6% tolerance budget in feedback networks.
Power Dissipation	300 mW - sets maximum continuous DC power handling on FR-4 PCB with recommended pad layout.
Zener Impedance	100 Ω max @ 5 mA - determines output voltage stability under load transients; lower than AZ23C47 (750 Ω).
Temperature Coefficient	+0.110 %/°C - indicates positive drift with temperature; critical for high-accuracy references above 40 °C ambient.
Min Reverse Voltage	38 V - ensures reliable blocking below Zener knee; prevents premature conduction in series-clamp configurations.
Thermal Resistance	417 °C/W - quantifies junction-to-ambient rise per watt; requires thermal derating above 70 °C ambient per Fig. 1.

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3 terminals, 0.008 g mass, moisture sensitivity level 1, and UL 94V-0 flammability rating.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (common)	Shared anode connection for both Zener elements; must be tied to lowest potential node in dual-reference topology.
Pin 2	Cathode (Zener 1)	First Zener cathode; used for primary 51 V reference or clamp path in feedback divider.
Pin 3	Cathode (Zener 2)	Second Zener cathode; enables redundant reference, differential sensing, or dual-rail protection.

Key Features

Feature	Design Value
Dual Zeners, common anode	Enables compact dual-voltage reference or bidirectional overvoltage clamp without external wiring.
ΔV_Z ≤ 5%	Guarantees tight matching between two Zeners in same package - essential for differential error detection.
JEDEC-qualified reliability	Validated for high-reliability applications including industrial control and automotive subsystems (AEC-Q101).
Lead-free & halogen-free	Complies with RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb).

Applications

Switch-Mode Power Supply Feedback

Industrial Sensor Signal Conditioning

Use Scenario: Regulating 48 V output in isolated flyback converter using optocoupler-coupled feedback loop.

IC Role / Device Role / Timing Role: Primary-side Zener reference establishing precise 51 V threshold for TL431-like comparator action.

Use Value: Tight 48–54 V tolerance and +0.110 %/°C TC ensure ±1.5% output accuracy across -40 °C to +105 °C operating range.

Use Scenario: Protecting 24 V analog input of PLC module against transient surges up to ±100 V.

IC Role / Device Role / Timing Role: Dual-Zener clamp limiting input voltage swing while preserving signal integrity via matched breakdown.

Use Value: Common-anode configuration allows symmetrical clamping to ground and rail with ≤5% V_Z mismatch.

Automotive Body Control Module

Medical Equipment Power Monitoring

Use Scenario: Providing redundant 51 V reference for battery management system monitoring 48 V mild-hybrid bus.

IC Role / Device Role / Timing Role: Dual Zener delivering fault-tolerant voltage sense point compliant with ISO 16750-2 pulse tests.

Use Value: AEC-Q101 qualification and 8 kV HBM ESD rating ensure robustness in noisy vehicle electrical environments.

Use Scenario: Stabilizing reference voltage for ADC measuring auxiliary 48 V DC-DC converter output in diagnostic imaging equipment.

IC Role / Device Role / Timing Role: Precision Zener setting absolute scale for 16-bit medical-grade voltage measurement chain.

Use Value: Low 100 Ω Z_ZT minimizes regulation error under varying load, supporting <0.05% full-scale accuracy.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-Zener reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX79-C51 (Nexperia)	Single Zener, DO-35 through-hole, 500 mW, ±5% V_Z, no dual-element or SOT23 footprint.	Lacks dual-Zener functionality and surface-mount compatibility; requires board redesign.	Select only when through-hole assembly is mandated and dual-Zener matching is unnecessary.
DZ23C51-7-F (Diodes Inc.)	Common-cathode dual Zener in SOT23; identical V_Z range but inverted polarity vs. AZ23C51.	Requires circuit-level polarity inversion; not drop-in replaceable without schematic change.	Choose when common-cathode topology aligns with existing feedback architecture (e.g., grounded-cathode shunt regulator).

Compared with BZX79-C51 and DZ23C51-7-F, AZ23C51-7-F uniquely delivers matched dual-Zener performance in a space-constrained SOT23 common-anode layout - critical for compact, high-precision, and fault-resilient voltage reference designs.

Availability

AZ23C51-7-F is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and medical equipment power monitoring requiring stable component supply and JEDEC-qualified reliability.

Supply support for AZ23C51-7-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.

AZ23C51-7-F belongs to the AZ23 series of dual Zener diodes engineered for high-precision voltage referencing and overvoltage protection in space-constrained, thermally demanding applications such as industrial automation and automotive subsystems.

FAQ

What is the maximum continuous Zener current for AZ23C51-7-F at 25°C?

The maximum continuous Zener current is derived from P_D = 300 mW and V_Z ≈ 51 V, yielding ~5.9 mA. However, the datasheet specifies test current I_ZT = 5.0 mA for parameter characterization, and operation beyond this requires thermal derating per Fig. 1's power derating curve.

Can AZ23C51-7-F be used in place of a single 51 V Zener diode?

Yes - Pin 1 (common anode) and Pin 2 (cathode) form one functional 51 V Zener; Pin 3 remains unused. This preserves all electrical specs but forfeits the dual-Zener matching benefit. Layout must accommodate unused cathode terminal per SOT23 pinout.

Does AZ23C51-7-F meet automotive qualification requirements?

The standard AZ23C51-7-F is commercial-grade. Automotive-qualified versions carry a "Q" suffix (e.g., AZ23C51Q-7-F), are manufactured in IATF 16949-certified facilities, and undergo full AEC-Q101 stress testing - confirmed on Diodes' automotive products page.

How does the +0.110 %/°C temperature coefficient affect long-term stability?

At +100 °C ambient, the Zener voltage increases by ~7.7 V relative to 25 °C (ΔT = 75 °C × 0.110 %/°C × 51 V), resulting in ~58.7 V regulation. System-level compensation or TC-matched resistor networks are required for sub-1% total error across wide temperature ranges.

AZ23C51-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Configuration:: 1 Pair Common Anode

Voltage - Zener (Nom) (Vz):: 51 V

Tolerance:: ±5%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AZ23C51-7-F FAQ

1.How can I place an order for AZ23C51-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for AZ23C51-7-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 AZ23C51-7-F reliable?

The price and inventory of AZ23C51-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ23C51-7-F is usually 5 days.

3.What payment methods are accepted for AZ23C51-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ23C51-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AZ23C51-7-F?

AZ23C51-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AZ23C51-7-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 AZ23C51-7-F?

For technical support, including AZ23C51-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ23C51-7-F requirements.

6.How does Aetrix verify that AZ23C51-7-F is sourced from the original manufacturer or authorized distributors?

All AZ23C51-7-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 AZ23C51-7-F meets industry standards.

7.What is the process for return or replacement of AZ23C51-7-F?

All AZ23C51-7-F units undergo pre-shipment inspection (PSI). If there is an issue with AZ23C51-7-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 AZ23C51-7-F part is unused and in its original packaging.

Return procedure for AZ23C51-7-F:

1.Submit a request within 90 days.

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

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