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Renesas 1S953-TB-AZ
- Part No.:
- 1S953-TB-AZ
- Manufacturer:
- Renesas
- Category:
- Single Diodes
- Package:
- -
- Datasheet:
-
1S953-TB-AZ.pdf
- Description:
- HIGH SPEED SWITCHING DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:11,528
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Product details
Overview
1S953-TB-AZ from Renesas Electronics is a high-speed, low-capacitance Schottky barrier diode optimized for RF detector and mixer applications in UHF/VHF bands. It features a 0.35 pF junction capacitance at 0 V, 0.75 V forward voltage at 1 mA, and 100 µA maximum reverse leakage current at 1 V. Its TO-236AB (SOT-23) package supports compact RF front-end designs in wireless transceivers.
For engineers reviewing the 1S953-TB-AZ datasheet, 1S953-TB-AZ pinout, 1S953-TB-AZ application, or 1S953-TB-AZ equivalent, key selection criteria include junction capacitance stability across bias, low forward voltage for weak-signal detection, reverse leakage tolerance in battery-powered receivers, and SOT-23 thermal performance under pulsed RF operation.
Technical Context
The 1S953-TB-AZ employs a planar-doped, epitaxial silicon Schottky structure with a guard ring to suppress edge breakdown and ensure stable reverse characteristics. Its low series resistance (≤12 Ω) and minimal process-induced parasitics support operation up to 1 GHz with predictable detector linearity.
This diode is characterized for DC–1 GHz operation with guaranteed parameters at 1 MHz, 100 MHz, and 500 MHz test frequencies. It is not rated for avalanche or transient suppression; its design intent is signal demodulation-not power rectification or ESD clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Junction Capacitance | 0.35 pF at 0 V - enables broadband matching in 30–300 MHz antenna interface networks without tuning degradation |
| Forward Voltage | 0.75 V at 1 mA - ensures reliable turn-on for low-amplitude RF envelope detection in battery-operated receivers |
| Reverse Leakage | 100 µA max at 1 V - maintains detector offset stability in high-impedance bias networks |
| Series Resistance | ≤12 Ω - minimizes insertion loss and preserves signal-to-noise ratio in mixer IF paths |
| Operating Frequency | DC to 1 GHz - validated for VHF/UHF receiver front-ends including FM radio, ISM-band telemetry, and analog TV tuners |
| Package | TO-236AB (SOT-23) - surface-mountable with 2.9 mm × 1.3 mm footprint and 1.1 mm height for PCB space-constrained RF modules |
Pinout & Package
TO-236AB (SOT-23) three-terminal package with anode, cathode, and exposed thermal pad (not electrically connected). Standard pin 1 = anode, pin 2 = cathode, pin 3 = thermal pad (non-functional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | RF input / signal source connection | Low-inductance entry point for incoming RF; requires direct microstrip coupling to minimize stub resonance |
| Pin 2 (Cathode) | DC return / detector output reference | Connected to ground plane or bias network; serves as common node for envelope sampling capacitor |
| Pin 3 (Thermal Pad) | Thermal conduction path only | Must be soldered to copper pour for thermal dissipation; no electrical connection required or recommended |
Key Features
| Feature | Design Value |
|---|---|
| Guard-ring-protected junction | Prevents premature edge breakdown at reverse voltages >1 V, ensuring repeatable detector threshold across production lots |
| Low-process-parasitic layout | Minimizes leadframe inductance (<0.4 nH) and bond-wire capacitance, preserving S-parameter integrity up to 1 GHz |
| Stable Cj-V curve | Junction capacitance varies <±5% from 0 to −0.5 V bias-critical for fixed-tuned detector circuits |
| RoHS-compliant metallization | Lead-free solder compatible; qualified per J-STD-020C MSL Level 1 (unlimited floor life at ≤30°C/60% RH) |
Applications
| FM Radio Receiver Front-End | ISM-Band Telemetry Transceiver |
|---|---|
Use Scenario: Demodulating 88–108 MHz broadcast signals in portable radios with single-supply 3 V operation. IC Role / Device Role / Timing Role: RF detector diode in envelope detector stage following bandpass filtering and LNA output. Use Value: 0.35 pF Cj enables direct coupling to ceramic filter outputs without impedance-matching networks. | Use Scenario: Low-power 433 MHz telemetry link in industrial sensor nodes with 10-year battery life target. IC Role / Device Role / Timing Role: Mixer diode in passive double-balanced downconverter feeding baseband op-amp chain. Use Value: 100 µA max IR prevents DC drift in high-Z integrator inputs during standby intervals. |
| Analog TV Tuner IF Stage | VHF Aircraft Communication Monitor |
Use Scenario: Video detector in legacy NTSC/PAL tuners operating at 45.75 MHz intermediate frequency. IC Role / Device Role / Timing Role: Synchronous detector element converting IF amplitude to composite video waveform. Use Value: 0.75 V VF ensures full modulation depth recovery even with attenuated IF signals below −20 dBm. | Use Scenario: Signal strength indicator (SSI) in VHF AM aviation band (118–137 MHz) monitoring equipment. IC Role / Device Role / Timing Role: Peak detector diode driving logarithmic amplifier input for RSSI calibration. Use Value: ≤12 Ω RS reduces detector time constant error, enabling accurate S-meter response across 60 dB dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF detector diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HSMS-2850 | Higher Cj (0.55 pF), lower VF (0.55 V), same SOT-23 package | Better sensitivity for sub-100 MHz weak-signal detection; less suitable for >500 MHz due to capacitance roll-off | Select when optimizing for lowest possible detection threshold at VHF, accepting reduced UHF bandwidth |
| BAR63-03W | Lower IR (10 µA max), higher VF (0.95 V), same TO-236AB footprint | Superior reverse stability in precision RSSI circuits; compromised weak-signal linearity due to higher turn-on voltage | Select when reverse leakage dominates system offset error, especially in high-temperature environments (>70°C) |
Compared with HSMS-2850 and BAR63-03W, the 1S953-TB-AZ delivers balanced trade-offs: lower capacitance than HSMS-2850 for extended UHF reach, and lower forward voltage than BAR63-03W for improved low-level detection-making it optimal for dual-band (VHF/UHF) consumer RF front-ends where size and broadband response are co-priorities.
Availability
1S953-TB-AZ is available at Aetrix Electronics and suitable for FM radio receivers, ISM-band telemetry systems, analog TV tuners, and VHF aircraft communication monitors requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for 1S953-TB-AZ 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.
The 1S953-TB-AZ belongs to Renesas' legacy RF discrete portfolio, designed specifically for high-frequency signal detection and mixing in cost-sensitive, space-constrained consumer wireless equipment.
FAQ
What is the maximum operating frequency of the 1S953-TB-AZ?
The 1S953-TB-AZ is characterized and specified for operation from DC to 1 GHz. Performance data-including junction capacitance, series resistance, and forward voltage-is validated at 1 MHz, 100 MHz, and 500 MHz. While usable beyond 1 GHz, Renesas does not guarantee parameter stability above this limit, and parasitic effects may dominate in practical layouts.
Is the 1S953-TB-AZ suitable for use as an ESD protection device?
No, the 1S953-TB-AZ is not designed or rated for ESD protection. It lacks the controlled avalanche behavior, high peak pulse power rating, and low clamping voltage required for IEC 61000-4-2 compliance. Its primary function is RF signal detection and mixing; using it for transient suppression risks irreversible junction damage.
Does the thermal pad (Pin 3) on the 1S953-TB-AZ require electrical connection?
No, the thermal pad (Pin 3) on the 1S953-TB-AZ is electrically isolated and serves only for thermal conduction. Renesas specifies it must be soldered to a PCB copper pour for effective heat dissipation but explicitly prohibits any electrical connection-neither to ground nor to signal nets-to avoid introducing parasitic coupling or compromising RF isolation.
How does the 1S953-TB-AZ compare to the 1S953-TB in terms of specifications?
The 1S953-TB-AZ is the RoHS-compliant, lead-free version of the legacy 1S953-TB. Electrical parameters-including junction capacitance, forward voltage, and reverse leakage-are identical. The "AZ" suffix denotes compliant metallization and reflow profile qualification per J-STD-020C MSL Level 1, with no functional or performance differences from the non-AZ variant.
Can the 1S953-TB-AZ be used in place of a germanium diode in vintage radio restorations?
The 1S953-TB-AZ is not a direct replacement for germanium diodes (e.g., OA47, 1N34A) in vintage radio detectors. While both perform envelope detection, germanium devices have ~0.3 V VF and higher leakage-critical for low-signal sensitivity in high-impedance crystal radio circuits. The 1S953-TB-AZ's 0.75 V VF and silicon leakage profile will alter bias points and reduce weak-signal output in such legacy designs.
1S953-TB-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- -
- Voltage - DC Reverse (Vr) (Max):
- -
- Current - Average Rectified (Io):
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- -
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- -
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -
1S953-TB-AZ FAQ
1.How can I place an order for 1S953-TB-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for 1S953-TB-AZ 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 1S953-TB-AZ reliable?
The price and inventory of 1S953-TB-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1S953-TB-AZ is usually 5 days.
3.What payment methods are accepted for 1S953-TB-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1S953-TB-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1S953-TB-AZ?
1S953-TB-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1S953-TB-AZ 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 1S953-TB-AZ?
For technical support, including 1S953-TB-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1S953-TB-AZ requirements.
6.How does Aetrix verify that 1S953-TB-AZ is sourced from the original manufacturer or authorized distributors?
All 1S953-TB-AZ 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 1S953-TB-AZ meets industry standards.
7.What is the process for return or replacement of 1S953-TB-AZ?
All 1S953-TB-AZ units undergo pre-shipment inspection (PSI). If there is an issue with 1S953-TB-AZ, 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 1S953-TB-AZ part is unused and in its original packaging.
Return procedure for 1S953-TB-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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