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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics BAT43

Name: BAT43
Brand: STMicroelectronics
SKU: BAT43
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAT43

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BAT43.pdf

Description:: DIODE SCHOTTKY 30V 200MA DO35

Quantity:: RFQ Add To RFQ list

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Inventory:31,751

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Product details

Overview

BAT43 from STMicroelectronics is a small-signal Schottky barrier diode in DO-35 package, designed for low-voltage, high-speed switching applications. It features a typical forward voltage of 0.26 V at 2 mA, 30 V repetitive peak reverse voltage, 200 mA continuous forward current, and 5 ns reverse recovery time - enabling use in RF detector circuits, sample-and-hold clamps, and low-loss DC power path steering.

For engineers reviewing the BAT43 datasheet, BAT43 pinout, BAT43 application, or BAT43 equivalent, key selection criteria include its ultra-low VF at microamp/milliamp bias levels, minimal junction capacitance (7 pF at 1 V), thermal resistance (300 °C/W), and compatibility with hand-soldering (230 °C for 10 s).

Technical Context

The BAT43 employs a metal–silicon Schottky junction to achieve majority-carrier conduction, eliminating minority-carrier storage delay and enabling nanosecond-scale switching. Its low forward voltage drop stems from a low barrier height design optimized for signal-level rectification rather than power handling.

Thermal performance is defined by a 300 °C/W junction-to-ambient resistance under natural convection with 4 mm lead length, and operation is rated from –65 °C to +125 °C junction temperature. The device lacks integrated ESD protection beyond inherent junction robustness.

Key Specifications

Parameter	Value and Actual Design Meaning
V_F @ 2 mA	0.26 V - Enables signal detection below 0.3 V threshold, critical for weak RF envelope detection
V_RRM	30 V - Supports operation in 24 V logic-supplied analog front-ends and telecom line interfaces
I_F Continuous	200 mA - Sufficient for biasing low-current active circuits without heatsinking
t_rr	5 ns - Allows reliable operation up to ~45 MHz switching in clipping/clamping topologies
C_j @ 1 V	7 pF - Minimizes capacitive loading in high-impedance RF detector nodes
R_th(j-a)	300 °C/W - Limits self-heating to <15 °C rise at 100 mW dissipation in open-air mounting

Pinout & Package

DO-35 glass axial package with cathode identified by a ring at one end; leads are tinned copper alloy, 0.458–0.558 mm diameter, 3.05–4.50 mm body length, 1.53–2.00 mm body diameter, weight 0.15 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node in rectifier or clamp; requires no series resistor for signal-level currents
Cathode	Forward current exit / reverse blocking terminal	Marked with color ring; ties to reference or higher-potential rail; reverse leakage <0.5 µA at 25 V

Key Features

Feature	Design Value
Ultra-low forward voltage	0.26 V at 2 mA - Reduces signal loss in RF detector diodes and precision clamp circuits
Nanosecond reverse recovery	5 ns - Eliminates tail current in fast-switching sample-and-hold and pulse shaping
Low junction capacitance	7 pF at 1 V reverse bias - Preserves high-frequency response in 45 MHz RF mixer/limiter stages
Wide operating temperature range	–65 °C to +125 °C - Validated for industrial and automotive under-hood sensor interface use

Applications

RF Detector Circuit

Low-Voltage Clamp

Use Scenario: Demodulating AM signals in portable radios and RFID readers using passive envelope detection.

IC Role / Device Role / Timing Role: Signal-level rectifier converting RF carrier amplitude into baseband voltage.

Use Value: 0.26 V V_F enables detection of sub-100 mV input envelopes without preamplification.

Use Scenario: Protecting ADC inputs from transient overvoltage in data acquisition systems.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting input swing to V_DD + 0.3 V.

Use Value: 5 ns t_rr prevents latch-up during multi-MHz sampling edge transients.

Sample-and-Hold Input Stage

DC Power Path Steering

Use Scenario: Isolating hold capacitor from op-amp output during acquisition phase in precision ADC front-ends.

IC Role / Device Role / Timing Role: Low-leakage, low-V_F switch enabling <10 nA hold capacitor discharge error.

Use Value: 0.5 µA I_R at 25 V ensures <0.1 mV/sec drift on 1 nF hold capacitor.

Use Scenario: OR-ing two 3.3 V supply rails in redundant power architectures.

IC Role / Device Role / Timing Role: Passive ideal diode replacement minimizing forward drop and heat generation.

Use Value: 0.33 V V_F at 15 mA reduces power loss by >60% vs. standard silicon diodes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5711	V_F = 0.45 V @ 10 mA; C_j = 4 pF @ 0 V; t_rr = 500 ps	Higher V_F limits weak-signal detection; lower C supports >100 MHz RF use	Prefer for UHF detector where capacitance dominates, accept higher V_F
BAT54	SOT-23 package; dual configuration; V_F = 0.33 V @ 10 mA; I_F = 200 mA	Surface-mount only; not axial; higher thermal resistance (~400 °C/W)	Choose for space-constrained PCBs requiring dual diodes or automated assembly

Compared with BAT43, 1N5711 offers superior RF bandwidth but sacrifices low-bias sensitivity, while BAT54 trades axial through-hole reliability and thermal performance for SMT density and dual functionality - selection depends on layout constraints and signal amplitude requirements.

Availability

BAT43 is available at Aetrix Electronics and suitable for RF detector circuits, low-voltage clamping, sample-and-hold input stages, and DC power path steering requiring stable component supply across industrial, test equipment, and consumer electronics production.

Supply support for BAT43 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The BAT series targets general-purpose, low-power signal conditioning - emphasizing low V_F, fast switching, and rugged DO-35 packaging for legacy and cost-sensitive designs.

FAQ

What is the maximum soldering temperature for BAT43?

The BAT43 is rated for a maximum soldering temperature of 230 °C for 10 seconds at 4 mm from the case. This specification assumes convection-only heating; wave soldering profiles must limit peak temperature exposure to avoid glass-body cracking or internal bond degradation.

Can BAT43 replace BAT42 in existing designs?

Yes - BAT43 and BAT42 share identical DO-35 packaging, absolute ratings, and thermal characteristics. The primary difference is forward voltage: BAT43 has lower V_F (0.26 V @ 2 mA) versus BAT42 (0.4 V @ 2 mA), making it preferable in ultra-low-signal applications without circuit modification.

Is BAT43 suitable for reverse polarity protection?

No - BAT43 is not recommended for reverse polarity protection due to its 30 V V_RRM and lack of surge current rating beyond 4 A single-pulse (10 ms). Dedicated protection diodes like SMAJ33A offer higher robustness, standardized TVS clamping, and guaranteed avalanche energy handling.

What is the typical reverse leakage at 100 °C?

At 100 °C junction temperature and 25 V reverse bias, BAT43 exhibits typical reverse leakage current of 100 µA. This value is specified in the datasheet's Fig. 3 and impacts hold capacitor discharge rate in high-temperature sample-and-hold applications.

BAT43 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 30 V

Current - Average Rectified (Io):: 200mA

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 200 mA

Speed:: Small Signal =< 200mA (Io), Any Speed

Reverse Recovery Time (trr):: 5 ns

Current - Reverse Leakage @ Vr:: 500 nA @ 25 V

Capacitance @ Vr, F:: 7pF @ 1V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

Operating Temperature - Junction:: -65°C ~ 125°C

BAT43 FAQ

1.How can I place an order for BAT43 through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT43 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 BAT43 reliable?

The price and inventory of BAT43 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT43 is usually 5 days.

3.What payment methods are accepted for BAT43?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT43 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT43?

BAT43 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT43 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 BAT43?

For technical support, including BAT43 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT43 requirements.

6.How does Aetrix verify that BAT43 is sourced from the original manufacturer or authorized distributors?

All BAT43 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 BAT43 meets industry standards.

7.What is the process for return or replacement of BAT43?

All BAT43 units undergo pre-shipment inspection (PSI). If there is an issue with BAT43, 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 BAT43 part is unused and in its original packaging.

Return procedure for BAT43:

1.Submit a request within 90 days.

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

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