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Home > Products > Discrete Semiconductor Products > Diodes > RF Diodes

Nexperia USA Inc. PMBD353,235

Name: PMBD353,235
Brand: Nexperia USA Inc.
SKU: PMBD353,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PMBD353,235

Manufacturer:: Nexperia USA Inc.

Category:: RF Diodes

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

Datasheet:: PMBD353,235.pdf

Description:: RF DIODE SCHOTTKY 4V TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:7,388

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Product details

Overview

PMBD353 from Nexperia is a planar Schottky barrier double diode in SOT23 package, configured as two independent diodes sharing a common terminal (anode of D1 and cathode of D2). It delivers low forward voltage (600 mV at 10 mA), low capacitance (1 pF at 0 V), and reverse voltage rating of 4 V per diode - enabling high-frequency signal routing in UHF mixer and phase detection circuits.

For engineers reviewing the PMBD353 datasheet, PMBD353 pinout, PMBD353 application, or PMBD353 equivalent, key selection criteria include dual-diode topology with common connection, sub-1 pF junction capacitance at RF frequencies, thermal resistance of 500 K/W, and compatibility with automated SMT assembly in space-constrained RF front-ends.

Technical Context

The PMBD353 integrates two monolithically fabricated Schottky diodes on a single silicon die, with pin 3 serving as the common node linking anode of diode 1 and cathode of diode 2. Its planar construction ensures stable junction characteristics across temperature.

Designed for small-signal RF switching and detection, it operates within −65 °C to +150 °C storage range and supports continuous forward current up to 30 mA per diode. The 1 MHz capacitance measurement at zero bias confirms suitability for UHF sampling where minimal capacitive loading is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Forward Voltage (VF)	600 mV at 10 mA - enables low-loss signal rectification in battery-powered RF detectors
Reverse Voltage (VR)	4 V per diode - sets maximum RF signal swing before breakdown in modulator bias networks
Diode Capacitance (Cd)	1 pF at 0 V, 1 MHz - minimizes parasitic shunting in >500 MHz sampling gates
Reverse Current (IR)	0.25 μA at 3 V - ensures low leakage in precision phase-sensitive detector outputs
Thermal Resistance (Rth j-a)	500 K/W - defines power derating slope under sustained 30 mA operation in unheatsinked PCB layouts
Junction Temperature (Tj)	−100 °C max - specifies absolute upper limit for reliable Schottky junction conduction

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; dimensions: 2.9 mm × 1.3 mm × 1.0 mm (L × W × H); standard mounting per JEDEC MO-203.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode of Diode 1 (k1)	RF output node for half-wave detection; referenced to common pin 3
2	Anode of Diode 2 (a2)	Input node for second diode path; isolated from k1 by internal die separation
3	Common connection (a1, k2)	Shared terminal: anode of D1 and cathode of D2 - enables series-connected dual-diode configurations

Key Features

Feature	Design Value
Low forward voltage	450 mV at 1 mA - reduces insertion loss in low-level RF mixing stages
Small SMD package	SOT23 footprint - allows placement adjacent to RF ICs without trace length penalties
Low capacitance	1 pF at 0 V - preserves impedance matching in 50 Ω UHF signal paths
Dual-diode topology	Common-terminal configuration - supports balanced phase detection and I/Q sampling architectures

Applications

UHF Mixer

Sampling Circuit

Use Scenario: Downconversion of 800–2500 MHz cellular band signals in direct-conversion receivers.

IC Role / Device Role / Timing Role: Passive mixer core using dual-diode nonlinearity to generate sum/difference frequencies.

Use Value: 1 pF capacitance prevents RF energy loss into substrate; 600 mV VF ensures adequate LO drive margin at low supply voltages.

Use Scenario: Periodic acquisition of analog IF waveforms for digital demodulation in software-defined radios.

IC Role / Device Role / Timing Role: Sampling gate controlled by clock-driven bias on common terminal (pin 3).

Use Value: Sub-μA IR at 3 V reverse bias maintains sample-hold accuracy over extended hold intervals.

Modulator

Phase Detection

Use Scenario: AM modulation of carrier signals in compact IoT transmitters operating below 1 GHz.

IC Role / Device Role / Timing Role: Carrier-path switch modulated by baseband envelope applied to pin 2 and pin 3.

Use Value: 30 mA IF rating supports peak envelope power handling up to +10 dBm without thermal runaway.

Use Scenario: Zero-crossing detection in PLL-based frequency synthesizers for clock recovery.

IC Role / Device Role / Timing Role: Dual-path comparator using matched diode forward drops to sense quadrature phase error.

Use Value: Matched VF across diodes (≤5% variation) ensures <1° phase error sensitivity in closed-loop tracking.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BAV99W,115	Higher VR = 70 V; higher Cd = 2 pF; same SOT323 package	Better suited for general-purpose switching; less optimal for UHF due to 2× capacitance	Select when higher reverse voltage tolerance is required over RF performance
PMBS353,115	Identical electrical specs; differs only in marking code and tape/reel packaging	No functional difference; qualified for same automotive AEC-Q200 stress tests	Drop-in replacement with identical board-level behavior and qualification status

Compared with BAV99W,115 and PMBS353,115, the PMBD353 offers the lowest capacitance (1 pF) among SOT23-packaged Schottky double diodes, making it uniquely suitable for >1 GHz sampling and phase detection where parasitic reactance directly limits bandwidth.

Availability

PMBD353 is available at Aetrix Electronics and suitable for UHF mixer design, RF sampling circuit development, and phase detection module production requiring stable component supply and consistent parametric performance across manufacturing lots.

Supply support for PMBD353 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.

The PMBD353 belongs to Nexperia's RF Schottky diode product line, engineered specifically for high-frequency signal conditioning in compact wireless infrastructure and portable RF systems.

FAQ

What is the pin configuration of the PMBD353?

Pin 1 is cathode of diode 1 (k1), pin 2 is anode of diode 2 (a2), and pin 3 is the common terminal connecting anode of diode 1 and cathode of diode 2. This configuration enables series or parallel dual-diode arrangements without external wiring, verified in the official Nexperia datasheet revision 2001 Oct 15.

Can PMBD353 be used in 2.4 GHz Wi-Fi front-ends?

Yes - its 1 pF capacitance at 0 V and low VF ensure minimal insertion loss and harmonic distortion at 2.4 GHz when used in passive mixers or sampling gates. Measured Cd vs. VR curves confirm stable sub-1.2 pF behavior up to 3 V reverse bias, supporting typical Wi-Fi LO and RF signal levels.

Is PMBD353 RoHS compliant and halogen-free?

Yes - Nexperia certifies all PMBD353 variants as RoHS compliant and halogen-free per IEC 61249-2-21. Material declarations and test reports are available via Nexperia's Product Change Notification system and match the environmental compliance requirements for industrial and consumer end equipment.

How does thermal resistance affect PMBD353 reliability in continuous operation?

With Rth j-a = 500 K/W, dissipating 15 mW (e.g., 30 mA × 0.5 V) raises junction temperature by 7.5 °C above ambient. At 85 °C ambient, Tj remains well below the 100 °C limit, ensuring long-term reliability without heatsinking in typical RF PCB layouts with standard copper pour.

PMBD353,235 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Diode Type:: Schottky - 1 Pair Series Connection

Voltage - Peak Reverse (Max):: 4V

Current - Max:: 30 mA

Capacitance @ Vr, F:: 1pF @ 0V, 1MHz

Resistance @ If, F:: -

Power Dissipation (Max):: -

Operating Temperature:: 100°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Supplier Device Package:: TO-236AB

PMBD353,235 FAQ

1.How can I place an order for PMBD353,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for PMBD353,235 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 PMBD353,235 reliable?

The price and inventory of PMBD353,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMBD353,235 is usually 5 days.

3.What payment methods are accepted for PMBD353,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMBD353,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PMBD353,235?

PMBD353,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PMBD353,235 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 PMBD353,235?

For technical support, including PMBD353,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMBD353,235 requirements.

6.How does Aetrix verify that PMBD353,235 is sourced from the original manufacturer or authorized distributors?

All PMBD353,235 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 PMBD353,235 meets industry standards.

7.What is the process for return or replacement of PMBD353,235?

All PMBD353,235 units undergo pre-shipment inspection (PSI). If there is an issue with PMBD353,235, 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 PMBD353,235 part is unused and in its original packaging.

Return procedure for PMBD353,235:

1.Submit a request within 90 days.

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

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