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MMBV2105LT1
Electronics Part Number
MMBV2105LT1-WXManufacturer
Texas Instruments
MMBV2105LT1
Description
30V SS tuning diode in SOT-23 package.Inventory
686 Pcs New Original In Stock
SOT-23-3 varactor diode; 30V; stable capacitance tuning, low leakage; for oscillator tuning, RF filters, and frequency synthesizers.
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Minimum 1
Minimum 1
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Basic cost: USD 70.00
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Technical Specifications
Category
Linear, Amplifiers, Audio Amplifiers
Manufacturer
Texas Instruments
Packaging
Tube
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
36-BSSOP (0.433", 11.00mm Width) Exposed Pad
Series
PurePath Digital™
Features
Digital Inputs, Short-Circuit and Thermal Protection, Shutdown
Base Product Number
TAS5121
Product Status
Obsolete
Type
Class D
Output Type
1-Channel (Mono)
Voltage - Supply
10.8V ~ 13.2V
Supplier Device Package
36-HSSOP
Max Output Power x Channels @ Load
100W x 1 @ 4Ohm
Data Sheet Document (D)
Datasheets
Download TAS5121IDKD Product Specification (PDF)
HTML Datasheet
TAS5121IDKD-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
4 (72 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.33.0001
Additional Information
Other Names
TEXTISTAS5121IDKD 2156-TAS5121IDKD -TAS5121IDKDE4-NDR -296-17474-5-DG -296-17474-5 296-17474-5 -TAS5121IDKD-NDR -TAS5121IDKDE4
Standard Package
29
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the TAS5121IDKD in a new audio amplifier design given it
Using the TAS5121IDKD in new designs carries significant supply chain risks due to its obsolete status, which may lead to long-term availability issues and increased component costs. Engineers should evaluate alternative active parts like the TPA3220DDWR early in the design cycle. If proceeding with the TAS5121IDKD, secure lifetime buys and verify stocking distributor inventory levels regularly. Consider designing with drop-in-compatible footprints or programmable digital interfaces to ease future migrations. Also, assess firmware compatibility if replacing with newer PurePath Digital™ devices requiring different control protocols.
How does the TAS5121IDKD compare to the TPA3220DDWR for high-power Class D amplifier replacement in
The TAS5121IDKD and TPA3220DDWR both support high-efficiency Class D amplification, but the TPA3220DDWR offers higher power flexibility (up to 300W into 4Ω) and is actively recommended for new designs. Unlike the obsolete TAS5121IDKD, the TPA3220DDWR includes advanced PWM optimization and better EMI reduction features. Pin-to-pin compatibility is not guaranteed—careful footprint and layout review is required. Additionally, the TPA3220DDWR operates with a wider supply range (8V to 26V) and includes cycle-by-cycle current limiting, making it more robust in harsh industrial environments where voltage transients occur.
What thermal management considerations are critical when integrating the TAS5121IDKD in a compact 10
The TAS5121IDKD dissipates significant heat at full 100W output into 4Ω, requiring an effective thermal path via the exposed pad to minimize junction temperature. Use a minimum 4-layer PCB with ample vias under the thermal pad connected to a ground plane. Avoid placing temperature-sensitive components nearby. Monitor die temperature during operation, especially in enclosed spaces or ambient temperatures above 70°C. Since the device has thermal shutdown protection, transient thermal spikes can cause audio dropouts—design for 20–30°C below max rating (85°C ambient) to ensure reliability over long duty cycles.
Can the TAS5121IDKD safely drive 3Ω or lower speaker loads in automotive audio systems, and what are
The TAS5121IDKD is specified for 4Ω minimum load impedance. Driving 3Ω or lower increases output current beyond design limits, risking overcurrent stress, excessive power dissipation, and thermal shutdown. While short-circuit protection is built-in, sustained low-impedance operation degrades reliability and may trigger protection circuits during peak transients. In automotive applications with variable battery voltages, avoid loads below 4Ω. If lower impedance drivers are needed, use a bridge-tied load (BTL) configuration compatible with these demands or consider robust replacements like the TPA3220DDWR, which better handles dynamic loads.
What are the signal integrity best practices for routing digital audio inputs to the TAS5121IDKD in
The TAS5121IDKD uses digital inputs (e.g., I2S, TDM), making it sensitive to clock jitter and EMI. Route differential clock and data lines with controlled impedance and keep them short and away from switching nodes like the H-bridge outputs. Use ground shielding or guard traces around digital lines. Terminate clock lines if trace length exceeds 2 inches. Power the digital I/O section with a clean LDO, separate from the power stage supply. Ensure solid ground plane continuity between the source IC and TAS5121IDKD to prevent ground loops, which can introduce audible noise in high-SNR audio systems.
What are the key design-in risks when using the TAS5121IDKD in a new audio amplifier design given it
Using the TAS5121IDKD in new designs carries significant supply chain risks due to its obsolete status, which may lead to long-term availability issues and increased component costs. Engineers should evaluate alternative active parts like the TPA3220DDWR early in the design cycle. If proceeding with the TAS5121IDKD, secure lifetime buys and verify stocking distributor inventory levels regularly. Consider designing with drop-in-compatible footprints or programmable digital interfaces to ease future migrations. Also, assess firmware compatibility if replacing with newer PurePath Digital™ devices requiring different control protocols.
How does the TAS5121IDKD compare to the TPA3220DDWR for high-power Class D amplifier replacement in
The TAS5121IDKD and TPA3220DDWR both support high-efficiency Class D amplification, but the TPA3220DDWR offers higher power flexibility (up to 300W into 4Ω) and is actively recommended for new designs. Unlike the obsolete TAS5121IDKD, the TPA3220DDWR includes advanced PWM optimization and better EMI reduction features. Pin-to-pin compatibility is not guaranteed—careful footprint and layout review is required. Additionally, the TPA3220DDWR operates with a wider supply range (8V to 26V) and includes cycle-by-cycle current limiting, making it more robust in harsh industrial environments where voltage transients occur.
What thermal management considerations are critical when integrating the TAS5121IDKD in a compact 10
The TAS5121IDKD dissipates significant heat at full 100W output into 4Ω, requiring an effective thermal path via the exposed pad to minimize junction temperature. Use a minimum 4-layer PCB with ample vias under the thermal pad connected to a ground plane. Avoid placing temperature-sensitive components nearby. Monitor die temperature during operation, especially in enclosed spaces or ambient temperatures above 70°C. Since the device has thermal shutdown protection, transient thermal spikes can cause audio dropouts—design for 20–30°C below max rating (85°C ambient) to ensure reliability over long duty cycles.
Can the TAS5121IDKD safely drive 3Ω or lower speaker loads in automotive audio systems, and what are
The TAS5121IDKD is specified for 4Ω minimum load impedance. Driving 3Ω or lower increases output current beyond design limits, risking overcurrent stress, excessive power dissipation, and thermal shutdown. While short-circuit protection is built-in, sustained low-impedance operation degrades reliability and may trigger protection circuits during peak transients. In automotive applications with variable battery voltages, avoid loads below 4Ω. If lower impedance drivers are needed, use a bridge-tied load (BTL) configuration compatible with these demands or consider robust replacements like the TPA3220DDWR, which better handles dynamic loads.
What are the signal integrity best practices for routing digital audio inputs to the TAS5121IDKD in
The TAS5121IDKD uses digital inputs (e.g., I2S, TDM), making it sensitive to clock jitter and EMI. Route differential clock and data lines with controlled impedance and keep them short and away from switching nodes like the H-bridge outputs. Use ground shielding or guard traces around digital lines. Terminate clock lines if trace length exceeds 2 inches. Power the digital I/O section with a clean LDO, separate from the power stage supply. Ensure solid ground plane continuity between the source IC and TAS5121IDKD to prevent ground loops, which can introduce audible noise in high-SNR audio systems.
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Sep 15 2026
