1N4148W - 100V 150mA Fast Switching Diode in SOD-123 from Diodes Inc / Vishay / Multi-Source

What Are the Technical Specifications of 1N4148W?

What Are the Alternatives to 1N4148W?

1N4148W vs 1N4148WS - Detailed Comparison

How Much Does 1N4148W Cost and Is It in Stock?

Global stock exceeds 1 billion units across all manufacturers. ICMASS stocks full reels (3,000 pcs/reel) and cut-tape quantities. Same-day dispatch from Shenzhen.

What Are the Typical Applications of 1N4148W?

1. Signal Clamping and ESD Protection for MCU GPIO Pins - Dual diode clamp to Vcc/GND protects ADC inputs and digital I/O from overvoltage. 4ns response time catches even fast transients.
2. Flyback/Freewheeling Diode for Relays and Solenoids - Anti-parallel across inductive loads to suppress turn-off voltage spikes. For coil currents under 150mA.
3. Logic Level Shifting and Signal Routing - Diode-OR circuits, wired-AND logic, and simple level translation. 2pF junction capacitance keeps signal integrity at MHz speeds.
4. Peak Detection and Envelope Demodulation - AM radio receivers, sensor signal conditioning, audio peak-hold circuits. 4ns recovery enables accurate envelope tracking.
5. Reverse Polarity Protection for Low-Current Circuits - Series diode on power input blocks reverse voltage. ~0.7V drop acceptable for 5V+ rails.

Why Buy 1N4148W from ICMASS?

1. Full reel, cut tape, or mixed orders - Full reels (3,000 pcs) for production, cut-tape for prototyping, mixed BOM on one invoice.
2. Multi-source supply - Diodes Inc., Vishay, and cost-optimized Chinese suppliers. No single-factory dependency.
3. Genuine parts, no remarked junk - Sourced direct from franchised distribution and factory-authorized channels. Every batch traceable.
4. Combine with your entire BOM - One shipment, one customs clearance, one invoice. Same-day pickup available for Shenzhen and HK customers.

Frequently Asked Questions About 1N4148W

Q1: What is the difference between 1N4148 and 1N4148W?
A: The 1N4148 (no suffix) is the through-hole version in DO-35 glass axial package. The 1N4148W is the surface-mount version in SOD-123. Electrically identical - 100V, 150mA, 4ns. The "W" suffix denotes SOD-123.

Q2: Can I use 1N4148W instead of 1N4007 for rectification?
A: Only for currents under 100mA. The 1N4148W is rated for 150mA; the 1N4007 handles 1A. For signal rectification it's fine. For power rectification above 100mA, use 1N4007 or SS34.

Q3: What does the marking code "T4" on 1N4148W mean?
A: "T4" is the standard marking code for 1N4148W in SOD-123. The cathode is identified by a band/stripe on the package body.

Q4: Can I use 1N4148WS if my board footprint is SOD-123?
A: No. SOD-323 (WS) is smaller than SOD-123 (W) - pads don't align. Not a drop-in replacement. Choose the right package for your PCB layout.

Q5: What is the maximum frequency 1N4148W can handle?
A: Usable up to ~100-250MHz in switching circuits, depending on circuit impedance. For RF detectors above 500MHz, use a Schottky RF diode like BAT54.

Q6: Which way does the cathode face on SOD-123?
A: The cathode is marked by a band/stripe on the package body. On the PCB, look for a silkscreen "K" or distinctive pad shape.

Q7: Can I use 1N4148W as a temperature sensor?
A: Yes. Forward voltage decreases ~-2mV/°C at constant current. At 1mA bias, VF changes from ~0.75V at -55°C to ~0.35V at +150°C. Accuracy ±2-3°C.

Q8: Is 1N4148W RoHS compliant?
A: Yes, all current-production parts are RoHS compliant and lead-free. Parts with "-7-F" (Diodes Inc.) or "-E3" (Vishay) suffixes explicitly denote lead-free plating.

Q9: How many 1N4148W are on a standard reel?
A: 3,000 pieces per 7-inch reel. 8mm tape width, 4mm component pitch - industry standard for SOD-123.

Q10: Can 1N4148W survive reflow soldering?
A: Yes. SOD-123 is designed for standard lead-free reflow profiles with peak 260°C for 10 seconds. JEDEC moisture sensitivity level 1 (unlimited floor life).

Q11: What is the difference between 1N4148W and BAS16W?
A: Both are 100V, ~150-215mA, 4ns switching diodes in SOD-123. Electrically interchangeable for virtually all signal diode applications. 1N4148W is more widely stocked and typically cheaper.

Q12: Why does my 1N4148W measure as a short circuit?
A: If it measures near-zero ohms in both directions, it's damaged - likely overcurrent exceeding the 2A surge rating, or overheating during soldering. If open in both directions, the internal bond wire may have fused.

Q13: Does 1N4148W need a heatsink?
A: No. At max rated current (150mA), dissipation is ~150mW. SOD-123 thermal resistance (~315-450°C/W) gives a 50-70°C junction rise - well within the 150°C max. No heatsink needed.