TDA5100 - ASK/FSK RF Transmitter 433/868MHz | Infineon
MPN: TDA5100 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.3 | $230.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
Drop-in alternatives for TDA5100 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TDA5100B2
β Drop-Inπ Reference alternative (not in catalog)
TDA5150
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
TDA5100 Maximum Ratings & Electrical Characteristics
| Function | Single-chip ASK/FSK RF transmitter |
| Frequency Bands | 433 MHz to 435 MHz, 866 MHz to 870 MHz |
| Modulation | ASK, FSK |
| Maximum Output Power | 5 dBm |
| Maximum Data Rate | 20 kbps |
| Supply Voltage | 2.5 V / 3.3 V |
| Frequency Synthesizer | Fully integrated on-chip |
| Antenna | PCB or surface mount antenna |
| Package | 16-TSSOP (4.40 mm width) |
| Mounting Type | Surface Mount |
| Integration Level | Requires only a few external components |
| Application Focus | Low-power short-range ISM-band links |
| Product Family | Infineon RF Transmitters |
| Datasheet Length | 39 pages |
TDA5100 16-tssop (4.40 mm width) Pin Configuration Guide
Complete pinout information for TDA5100 (16-tssop (4.40 mm width) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for TDA5100.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TDA5100 is suitable for 6 applications: Remote Keyless Entry (RKE), 868 MHz ISM Telemetry, Wireless Sensor Node Transmitters, Home Automation Control Links, Industrial Short-Range Actuation, Legacy and Retrofit BOM Maintenance.
Remote Keyless Entry (RKE)
The TDA5100 fits remote keyless entry transmitters because it combines the exact requirements of this application in one chip: 433-435 MHz or 866-870 MHz ISM operation, ASK modulation for simple low-cost receivers, +5 dBm output for tens-of-meters link range, and a 20 kbps data rate that easily accommodates rolling-code or fixed-code key fob frames. Its fully integrated frequency synthesizer locked to a single crystal means the carrier stays stable over temperature without factory trimming, and the small external-component count keeps the fob PCB tiny and battery-friendly at a 2.5 V or 3.3 V supply. Placed with a loop filter, crystal, and short matched antenna trace, the transmitter keys on/off rapidly between button presses to conserve coin-cell charge; the main design trade-off is keeping PLL lock time within the allowed frame preamble.
Recommended
868 MHz ISM Telemetry
For low-power telemetry nodes transmitting sensor data on the European 866-870 MHz SRD band, the TDA5100 provides a compliant, low-cost transmit chain: FSK modulation gives better noise immunity than ASK for interference-prone 868 MHz environments, the 20 kbps rate covers typical short telemetry frames, and the integrated synthesizer keeps frequency error within SRD channel tolerances. Supplied at 3.3 V from the node's logic rail, the transmitter drives a PCB antenna via a simple matching network with +5 dBm output, sufficient for building-scale ranges. Because it is transmit-only, the node pairs with a dedicated receiver or transceiver at the gateway. Designers should schedule transmissions to respect 868 MHz duty-cycle limits and allow the PLL to settle before the frame preamble to avoid transmitting during lock.
Recommended
Wireless Sensor Node Transmitters
Battery-powered sensor nodes benefit from the TDA5100's transmit-only architecture, which avoids the standby cost of a full transceiver. Operating from 2.5 V, the chip runs directly from two alkaline cells or a lithium coin cell without regulation, and the few required external components (crystal, loop filter, decoupling, antenna match) minimize board area in compact node form factors. The 20 kbps maximum rate permits short, low-energy bursts: a sensor reading of tens of bytes transmits in milliseconds, after which the transmitter is fully disabled between reports. ASK mode suits simplest receivers; FSK improves reliability where 433 MHz interference from other ISM users is present. The key energy trade-off is output power - +5 dBm is ample for room-to-room links, and firmware should disable the amplifier immediately after the last frame byte to maximize battery life.
Recommended
Home Automation Control Links
One-way control links for smart-home devices - wall switches, socket relays, blind and lighting controllers - are a classic fit for the TDA5100. The dual-band support lets a single transmitter design serve both the 433 MHz regional market and the 868 MHz market with a component change, while ASK modulation keeps receiver hardware in the controlled device minimal and inexpensive. The +5 dBm output with a simple wire or PCB antenna achieves whole-apartment range through typical walls at 433 MHz, and the 20 kbps rate handles command frames with address and checksum fields comfortably. Its fully integrated synthesizer removes tuning labor from manufacturing. Design attention should go to crystal tolerance across temperature so that low-cost receivers with wideband ASK detectors keep receiving at band edges.
Recommended
Industrial Short-Range Actuation
In industrial settings, the TDA5100 serves short-range one-way actuation links such as crane and hoist remote controls, gate openers, and machine start/stop transmitters. The 868 MHz band option avoids the crowded 433 MHz environment typical of factory floors, and FSK modulation provides the robustness needed around motors and switching equipment that generate broadband impulse noise. The transmitter's crystal-referenced synthesizer maintains channel accuracy despite wide factory temperature swings, and the TSSOP-16 surface-mount package survives conformal coating and vibration better than hand-tuned discrete transmitter modules. At 2.5-3.3 V it pairs directly with the handheld unit's battery rail. Safety-critical designs should add redundant command encoding and acknowledge-by-channel monitoring, since the TDA5100 provides no receive path.
Recommended
Legacy and Retrofit BOM Maintenance
The TDA5100 remains valuable for maintaining long-lived products whose radio boards were designed around it - automotive accessory transmitters, installed-base remote controls, and legacy industrial radios. Because the TDA5100B2 variant shares the same TSSOP-16 footprint and function, existing PCBs can be kept in production without layout changes, protecting certification test reports tied to the original design. The part's simplicity also makes counterfeits common in gray-market channels, so purchasing through authorized distributors with lot traceability is important for retrofit quality. This application is about continuity rather than new performance: engineers should verify remaining lifetime buys, keep the Infineon datasheet revision on file, and budget a migration path toward a modern sub-GHz transmitter for the next board spin.
Recommended
Recommended Products Summary
Engineering reference data for TDA5100 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TDA5100B2 | TDA5150 |
|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP - same | 16-TSSOP - same (verify pin map) |
| Brand | Infineon | Infineon | Infineon |
| Frequency Bands | 433-435 MHz / 866-870 MHz | 433-435 MHz / 866-870 MHz | Sub-GHz ISM bands (verify exact range) |
| Modulation | ASK / FSK | ASK / FSK | ASK / FSK |
| Maximum Output Power | 5 dBm | 5 dBm | [DATA_NEEDED] |
| Maximum Data Rate | 20 kbps | 20 kbps | [DATA_NEEDED] |
| Supply Voltage | 2.5 V / 3.3 V | 2.5 V / 3.3 V | [DATA_NEEDED] |
| Drop-in Status | Reference part | Drop-in (same family/footprint) | Candidate - verify pin map and config before substitution |
Key Differentiators
- Dual-band single-chip coverage (vs TDA5100B2)
- Dual modulation (ASK and FSK) (vs TDA5100B2)
- Fully integrated frequency synthesizer (vs TDA5150)
Design Notes
Keep the crystal, PLL loop filter, and antenna matching network physically separated and short. The TDA5100 integrates the full synthesizer, so the remaining layout risks are reference pulling and RF-to-PLL coupling. Route the antenna trace away from the loop filter nodes, use a solid ground plane under the TSSOP-16, and place 100 nF decoupling capacitors directly at each supply pin with a bulk capacitor nearby. Follow the evaluation-board layout in the Infineon datasheet as the baseline for matching-network component values.
The TDA5100 operates from 2.5 V or 3.3 V; shared supply rails between a microcontroller and the transmitter can inject digital noise into the synthesizer, producing spurious modulation. Filter the transmitter supply with a ferrite bead plus ceramic capacitors, and key the power amplifier off between transmissions to cut average current. Estimated: at a 10 ms frame every 10 s, even modest transmit current yields a negligible duty-cycle-averaged battery draw, so coin-cell lifetime is dominated by MCU sleep current instead.
The TDA5100 is transmit-only: it has no receiver, RSSI, or acknowledge mechanism, so protocols must tolerate one-way delivery (repetition, CRC at the receiver, or channel monitoring elsewhere). Also note that variant suffixes (e.g., TDA5100B2) carry variant-specific configuration - confirm band and modulation selection pins for your exact ordering code against the Infineon datasheet before release, and source only through authorized channels because this mature part is widely counterfeited.
Compliance Information
Compliance data was not present in the provided verified web data; confirm against the official Infineon product page and material declaration before procurement.
