1N4148WT-7 - 80V 125mA Fast Switching Diode SOD-523 | Diodes Inc
Référence : 1N4148WT-7 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.13 | $0,13 |
| 10 | $0.11 | $1,10 |
| 100 | $0.07 | $7,00 |
| 500 | $0.05 | $25,00 |
| 1 000 | $0.04 | $40,00 |
1N4148WT-7 Présentation
A switching diode is a two-terminal semiconductor device optimized to transition between conducting and blocking states with minimal storage delay. Within the broader discrete semiconductor hierarchy, switching diodes sit beneath small-signal diodes and above general-purpose rectifiers in speed class. The 1N4148 family has served as the de facto industry baseline for high-speed signal routing since the 1970s, and the WT suffix specifically maps the legacy DO-35 glass-axial 1N4148 onto the SOD-523 footprint for SMT reflow assembly.
Key features include a peak repetitive reverse voltage of 100 V (Vrrm), 75 Vrms working reverse voltage, 53 V DC blocking voltage, and a power dissipation of 150 mW on the standard FR-4 test board. The device is fully RoHS compliant, lead-free, and qualified to JEDEC JESD51 thermal test conditions. Its low junction capacitance (typically 4 pF at 0 V) preserves signal integrity in high-speed logic interfaces.
The 1N4148WT-7 employs a planar passivated silicon epitaxial junction, optimized for sub-5 ns switching. The glass-passivated die is bonded inside the SOD-523 molded plastic package with a matte tin finish that supports lead-free reflow profiles up to 260 C per JEDEC J-STD-020.
Typical applications include high-speed logic clamping, line termination, signal steering in multiplexers, freewheeling protection for small inductors, and reverse-polarity protection on low-current rails. The SOD-523 footprint saves 60% board area versus the legacy DO-35 1N4148, allowing direct migration in portable and IoT designs where every square millimeter counts.
When designing with this part, observe the 4 ns reverse recovery budget and stay below the 150 mA continuous forward rating. For higher currents use a Schottky diode, and for high-voltage isolation use a TVS or rectifier such as the 1N400x family.
This page synthesizes distributor pricing, drop-in alternatives, and practical PCB layout guidance not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour 1N4148WT-7 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec 1N4148WT-7 (même facteur de forme et même empreinte) — différant par Diode Type, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
1N4148WT-13
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
1N4148WTQ-7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMBD4148WT-7-F
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BAS16TW-7-F
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BAS516W6VD-7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BAS16TW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
1N4148X-TP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
1N4148WT-7 Valeurs maximales et caractéristiques électriques
| Diode Type | Standard Recovery, Fast Switching |
| Configuration | Single |
| Reverse Voltage (Vrrm) Max | 100 V |
| Working Reverse Voltage (Vwm) | 75 V |
| DC Blocking Voltage (Vdc) | 53 V |
| Average Rectified Forward Current (Io) | 125 mA (Diodes Inc datasheet) / 150 mA (Mouser listing) |
| Peak Forward Surge Current (Ifsm) | 2 A |
| Forward Voltage (Vf) Max | 1.25 V at 150 mA |
| Reverse Recovery Time (trr) | 4 ns |
| Junction Capacitance | 4 pF typical at 0 V |
| Power Dissipation (Pd) | 150 mW |
| Plage de température de fonctionnement | -65 C to +150 C |
| Boîtier / Format | SOD-523 |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (EU Directive 2002/95/EC and 2011/65/EU) |
| Lead-Free Finish | Matte Tin (no purposefully added lead) |
Configuration des broches de 1N4148WT-7
| Broche 1 | CATHODE (K) — Cathode terminal (marked with bar on top face) |
| Broche 2 | ANODE (A) — Anode terminal (unmarked side) |
Applications typiques
1N4148WT-7 convient pour 6 applications: High-Speed Logic Clamping, Signal Steering and Multiplexing, Freewheeling Diode for Low-Voltage Inductors, Reverse-Polarity Protection on Low-Current Rails, Line Termination and Waveform Shaping, Portable and Battery Device Design.
High-Speed Logic Clamping
The 1N4148WT-7's 4 ns reverse recovery and 4 pF junction capacitance make it well suited for clamping ESD transients and logic-level overshoot on 3.3 V and 5 V signal lines. Its SOD-523 footprint preserves routing density on dense microcontroller boards, while the 100 V Vrrm headroom protects against inductive kickback. Placed between signal and ground or signal and supply rail with a series resistor, the diode clamps fast transients that slower 1N400x rectifiers would miss due to their longer trr.
Recommandé
Signal Steering and Multiplexing
The 1N4148WT-7 is commonly deployed in analog multiplexer input stages where two or more signal paths must be OR'd or AND'd into a single downstream amplifier or ADC input. Its 4 ns trr preserves pulse edges at audio and low-RF frequencies, while its 150 mA forward rating handles typical 5 V sensor signal currents with margin. The low 4 pF capacitance prevents cross-channel feedthrough that would otherwise degrade measurement accuracy in multiplexed data-acquisition front ends.
Recommandé
Freewheeling Diode for Low-Voltage Inductors
In flyback converters and relay driver circuits where the inductor stores under 1 mJ of energy, the 1N4148WT-7 protects switching transistors and MOSFETs from inductive kickback. Its 100 V Vrrm comfortably clamps transients from 12 V and 24 V rails, and the 4 ns trr prevents the diode from conducting during the next turn-on edge, eliminating the efficiency loss seen with slower rectifiers. The SOD-523 package saves board area versus legacy DO-35 axial 1N4148 implementations.
Recommandé
Reverse-Polarity Protection on Low-Current Rails
For low-current 5 V or 12 V supply inputs drawing under 100 mA, a single 1N4148WT-7 placed in series with the supply line provides reverse-polarity protection at the cost of only 1.25 V of forward drop at 150 mA. Although Schottky diodes are more efficient, the 1N4148WT-7 wins on reverse leakage (under 5 uA at 75 V) and on voltage headroom for 24 V industrial buses where a Schottky's 30 V Vrrm would be inadequate.
Recommandé
Line Termination and Waveform Shaping
In high-speed digital interfaces and pulse-shaping networks, the 1N4148WT-7 functions as a clipper or clamper to limit signal excursions within an ADC's input range. Its 1.25 V forward drop defines a precise reference for symmetric clipping around ground when paired with a second diode in opposite polarity. The 4 ns trr ensures that clipping behavior is consistent at pulse edges with sub-10 ns rise times, making it suitable for fast comparator and line-driver circuits.
Recommandé
Portable and Battery Device Design
The 1N4148WT-7 is widely used in smartphone, wearable, and IoT battery-management designs where board area is critical and the diode handles signal-level switching rather than power rectification. Its SOD-523 1.6 mm x 0.8 mm footprint enables routing under BGA packages, while the 150 mW power dissipation rating is well matched to the < 50 mA currents typical of these applications. The RoHS-compliant matte-tin plating also satisfies lead-free reflow requirements up to 260 C.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour 1N4148WT-7 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 1N4148WT-13 | 1N4148WTQ-7 | MMBD4148WT-7-F | BAS16TW-7-F | 1N4148X-TP |
|---|---|---|---|---|---|---|
| Package | SOD-523 | SOD-523 - same | SOD-523 - same | SOD-523 - same | SOD-523 - same | SOD-523 - same |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Micro Commercial Components |
| Vrrm Max | 100 V | 100 V | 100 V | 100 V | 100 V | 100 V |
| Average Forward Current (Io) | 125-150 mA | 150 mA | 150 mA | 150 mA | 200 mA | 150 mA |
| Forward Voltage (Vf) | 1.25 V at 150 mA | 1.25 V at 150 mA | 1.25 V at 150 mA | 1.25 V at 150 mA | 1.25 V at 150 mA | 1.25 V at 150 mA |
| Reverse Recovery (trr) | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade | No (commercial) | No (commercial) | Yes (AEC-Q101) | No (commercial) | No (commercial) | No (commercial) |
Principaux différenciateurs
- Industry-standard 1N4148 die in the smallest SMD footprint (vs 1N4148W-7-F (SOD-123))
- Automotive-grade sibling available in same package (vs 1N4148WTQ-7 (Q-suffix))
- Cross-brand drop-in equivalent available for sourcing flexibility (vs 1N4148X-TP (Micro Commercial Components))
- Higher-current BAS family alternative in same footprint (vs BAS16TW-7-F (Diodes BAS16 family))
Notes de conception
The SOD-523 land pattern should be 0.8 mm x 1.0 mm with 0.3 mm x 0.4 mm pads per IPC-7351. Thermal dissipation is dominated by the cathode pad connected to a copper pour; on a 1 oz copper FR-4 test board the package is rated for 150 mW at 25 C ambient. For higher currents reduce ambient temperature or expand the cathode copper area. Estimated: power dissipation drops to about 75 mW at 85 C ambient based on linear derating to 150 mW at 25 C.
Estimated: with a 25 C ambient and 150 mW rating, the maximum continuous forward current is approximately 200 mA at 1.25 V drop before thermal runaway. For sustained operation at the rated 125-150 mA, keep the diode away from heat sources and provide a thermal copper pour on the cathode pad. The SOD-523 thermal resistance is roughly 350 C/W degrees junction-to-ambient on a JEDEC EIA/JESD51 test board.
Do not exceed 100 V peak repetitive reverse voltage or 150 mA continuous forward current. The 4 ns trr rating applies only when switching from a forward current of 10 mA to a reverse voltage of 6 V - at lower forward currents the trr increases. Always verify the cathode marking (bar on top face) before soldering, as reversed installation is one of the most common SOD-523 assembly defects.
The 4 pF junction capacitance introduces measurable loading on signals above 50 MHz. For high-speed serial interfaces above 100 Mbps, consider a lower-diodo version such as the BAS16TW which has similar capacitance but better-controlled recovery characteristics. Place the diode as close to the signal source or clamp node as practical to minimize parasitic inductance that would otherwise degrade clamping effectiveness.
Informations de conformité
RoHS compliant per EU Directive 2002/95/EC and 2011/65/EU (RoHS 2). Matte tin finish with no purposefully added lead. Not AEC-Q100/AEC-Q101 qualified in the standard -7 variant; the Q-suffix part 1N4148WTQ-7 is AEC-Q101 qualified for automotive.
