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Diodes Incorporated SD101B-T
- Part No.:
- SD101B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
SD101B-T.pdf
- Description:
- DIODE SCHOTTKY 50V 15MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,661
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Product details
Overview
SD101B-T from Diodes Incorporated is a low-leakage, ultrafast Schottky barrier diode in DO-35 glass package, rated for 50 V peak repetitive reverse voltage, 15 mA forward current, and 1.0 ns reverse recovery time, used in high-frequency signal demodulation and RF detector circuits.
For engineers reviewing the SD101B-T datasheet, SD101B-T pinout, SD101B-T application, or SD101B-T equivalent, key selection criteria include its 0.41 V forward voltage at 1.0 mA, 200 nA reverse leakage at 40 V, 2.1 pF junction capacitance at 0 V, DO-35 mechanical compatibility, and cathode-band polarity marking.
Technical Context
This discrete Schottky diode leverages guard ring construction to suppress transient-induced breakdown and supports high-speed switching with sub-nanosecond reverse recovery. Its low CT (2.1 pF) and low VFM enable efficient RF envelope detection in AM receivers and low-power sampling circuits.
The device operates across –65 °C to +175 °C, with thermal resistance of 375 °C/W and power dissipation limited to 400 mW under ambient lead temperature conditions - making it suitable for compact, unheatsinked PCB layouts where self-heating must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse blocking capability without avalanche conduction |
| VFM @ 1.0 mA | 0.41 V - low forward drop enables minimal signal loss in small-signal detection paths |
| IRM @ 40 V | 200 nA - ultra-low leakage preserves DC bias integrity in high-impedance nodes |
| CT @ 0 V, 1 MHz | 2.1 pF - low junction capacitance maintains bandwidth >100 MHz in RF coupling applications |
| trr | 1.0 ns - enables operation up to ~350 MHz in clipping and sampling circuits |
| Package | DO-35 - axial glass package with matte tin leads, RoHS-compliant, moisture sensitivity Level 1 |
| Polarity | Cathode band marked - unambiguous orientation for automated placement and manual assembly |
Pinout & Package
DO-35 glass axial package with two terminals: anode and cathode. Cathode identified by a visible band on the glass body. Leads are matte tin-plated, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node in forward-biased operation; requires no series resistor in detector applications |
| Cathode | Forward current exit / reverse-blocking terminal | Marked with band; ties to reference or ground in envelope detectors; defines polarity-sensitive rectification direction |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Suppresses edge breakdown during voltage transients, improving reliability in noisy RF environments |
| Low reverse recovery time (1.0 ns) | Minimizes switching distortion in high-frequency sampling and pulse shaping circuits |
| Low forward voltage (0.41 V @ 1 mA) | Reduces insertion loss in weak-signal AM demodulators and crystal radio front-ends |
| Low junction capacitance (2.1 pF) | Preserves Q-factor in tuned LC tank circuits and avoids detuning at VHF frequencies |
| RoHS-compliant matte tin finish | Ensures solderability consistency and eliminates lead-based contamination risk in final assembly |
Applications
| AM Radio Detector | RF Sampling Gate |
|---|---|
Use Scenario: Demodulating amplitude-modulated signals in portable AM receivers with passive LC front-end. IC Role / Device Role / Timing Role: Signal rectifier converting RF carrier envelope into audio baseband. Use Value: 0.41 V VFM ensures usable output from microvolt-level antenna signals without external amplification. | Use Scenario: Gating RF pulses in test equipment sampling heads operating up to 300 MHz. IC Role / Device Role / Timing Role: Fast-switching sampling diode enabling precise time-domain capture. Use Value: 1.0 ns trr and 2.1 pF CT minimize aperture uncertainty and frequency-dependent phase shift. |
| Clipping Circuit | Low-Power Bias Clamp |
Use Scenario: Limiting analog signal excursions in battery-powered sensor signal chains. IC Role / Device Role / Timing Role: Voltage limiter clamping positive peaks to VDD + 0.4 V. Use Value: Low VFM and negligible stored charge prevent overshoot and ringing during fast transitions. | Use Scenario: Establishing stable DC bias points in high-impedance op-amp feedback networks. IC Role / Device Role / Timing Role: Leakage-controlled clamp preventing drift in µA-level bias currents. Use Value: 200 nA IRM at 40 V ensures <1 µV error contribution in 5 MΩ impedance nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SD101AW-T | Higher VRRM (60 V), same DO-35 package, 0.39 V VFM @ 1 mA | Supports higher-voltage RF stages; slightly lower forward drop improves weak-signal sensitivity | Preferred for new designs requiring extended reverse margin or improved detector efficiency |
| BAT54-T | SOT-23 package, 30 V VRRM, 0.24 V VFM @ 10 mA, 10 pF CT | Surface-mount compatible but higher capacitance limits use above ~50 MHz | Choose only when board space constraints require SMT and frequency requirements stay below 30 MHz |
Compared with SD101B-T, SD101AW-T offers higher reverse voltage headroom and marginally better forward performance in identical packaging, while BAT54-T trades off RF bandwidth for assembly compatibility - making SD101B-T optimal for legacy through-hole, high-frequency detector roles where DO-35 fit and sub-2 pF CT are essential.
Availability
SD101B-T is available at Aetrix Electronics and suitable for AM radio detector circuits, RF sampling gates, analog clipping networks, and low-power bias clamps requiring stable component supply and long-lifecycle support.
Supply support for SD101B-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The SD101x series belongs to Diodes' general-purpose Schottky diode product line, engineered specifically for high-frequency signal detection, RF mixing, and low-current rectification in space-constrained analog systems.
FAQ
Is SD101B-T lead-free and RoHS compliant?
Yes. SD101B-T features a matte tin–plated lead finish and complies with EU Directive 2002/95/EC (RoHS), including all applicable exemptions documented in Annex Notes. It meets J-STD-020D Level 1 moisture sensitivity and MIL-STD-202 solderability requirements.
What is the maximum operating temperature for SD101B-T?
The SD101B-T is rated for continuous operation from –65 °C to +175 °C. Its glass DO-35 package and guard ring structure maintain stable electrical characteristics across this full range, provided leads remain near ambient temperature to sustain the 400 mW power rating.
Can SD101B-T replace SD101A-T or SD101C-T in existing designs?
Yes, with attention to voltage ratings: SD101B-T (50 V VRRM) sits between SD101A-T (60 V) and SD101C-T (40 V). Substitution is electrically safe if circuit reverse voltage stays ≤50 V; forward voltage and capacitance differences are minor (<0.02 V, <0.1 pF), preserving RF performance.
Why is SD101B-T marked "Not Recommended for New Design"?
Diodes Incorporated recommends SD101AW–SD101CW variants for new designs due to improved process control and tighter parameter distributions. SD101B-T remains fully functional and supported, but newer versions offer enhanced consistency in VFM and IRM across temperature and lot-to-lot production.
SD101B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 15mA
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 15 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 1 ns
- Current - Reverse Leakage @ Vr:
- 200 nA @ 40 V
- Capacitance @ Vr, F:
- 2.1pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
- Operating Temperature - Junction:
- -65°C ~ 175°C
SD101B-T FAQ
1.How can I place an order for SD101B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SD101B-T 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 SD101B-T reliable?
The price and inventory of SD101B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD101B-T is usually 5 days.
3.What payment methods are accepted for SD101B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD101B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD101B-T?
SD101B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD101B-T 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 SD101B-T?
For technical support, including SD101B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD101B-T requirements.
6.How does Aetrix verify that SD101B-T is sourced from the original manufacturer or authorized distributors?
All SD101B-T 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 SD101B-T meets industry standards.
7.What is the process for return or replacement of SD101B-T?
All SD101B-T units undergo pre-shipment inspection (PSI). If there is an issue with SD101B-T, 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 SD101B-T part is unused and in its original packaging.
Return procedure for SD101B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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