Name: MEAN WELL SFTN01 series: 1W isolated DC/DC converter - SFTN01N-09
Brand: MEAN WELL
SKU: SFTN01N-09
Price: 15.28 USD
Availability: InStock

MEAN WELL SFTN01 series: 1W isolated DC/DC converter - SFTN01N-09

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Description

SFTN01N-09 — 1W isolated DC/DC converter

MEAN WELL SFTN01N-09 is an isolated, unregulated 1 W DC/DC converter in an SMD package with an industry-standard pinout. It accepts 21.6–26.4 V DC input (24 V nominal) and provides a single output of 9 V DC, with 11.1–111 mA. Observe the stated minimum load, regulation and cooling conditions.

Download MEAN WELL SFTN01 Datasheet (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

SFTN01 electrical, environmental, mechanical and packing specifications: PDF pages 6–10.

Model selection and output

Complete model / series	SFTN01N-09 / SFTN01. Input code N: 24 V nominal; output code 09: 9 V. Blank suffix identifies the standard version.
Conversion and rated power	1 W rated. Rounded current values do not increase the rated power; observe the current window and thermal limits.
Output voltage and current	9 V DC; 11.1–111 mA. The lower current value is the specified minimum load.
Efficiency	76% typical; at normal input, rated load, 25°C and 70% RH.
Series efficiency reference	The SFTN01 feature page states efficiency up to 82%; use this model's typical efficiency above for selection.
Maximum capacitive load	220 µF.
Voltage accuracy	±2.0%.
Ripple and noise	75 mVp-p. Measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Line regulation	1.2% for 1% input variation; measured from low line to high line at rated load.
Load regulation	±8%; measured from 10% to 100% rated load.
Switching frequency	100 kHz typical.
Specification conditions	24 V DC normal input, rated load, 25°C and 70% RH, unless otherwise specified.

Input, protection and isolation

Input voltage	24 V DC nominal, ±10%; operating range 21.6–26.4 V DC.
Input current	No load: 10 mA; full load: 55 mA. The general specification conditions apply.
Input filter	Internal capacitor.
Recommended input fuse	150 mA slow-blow fuse recommended.
Internal power dissipation	500 mW.
Input surge voltage	30 V DC for 100 ms maximum. This is a surge limit, not the continuous operating range.
Short-circuit protection	The specification on PDF page 8 limits short circuit to 0.5 second maximum. The model-encoding table on page 6 separately states a 1-second maximum for the blank-suffix version. Apply the stricter 0.5-second limit and confirm the supplied revision before relying on a longer duration.
Input/output withstand voltage	3 kV DC between input and output.
Isolation resistance	100 MΩ between input and output; at 500 V DC, 25°C and 70% RH.
Isolation capacitance	80 pF typical.

Environment and reliability

Operating temperature	−40 to +90°C, subject to the model-specific cooling and derating curve.
Case temperature	+100°C maximum.
Cooling and derating	PDF page 9, natural convection: 100% load from −40 to +85°C, reduced to 60% at +90°C. The curve beyond +90°C does not extend the specified working range.
Working humidity	20–90% RH, non-condensing.
Storage temperature and humidity	−55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient	0.03%/°C over 0–85°C.
Vibration	10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes along each of the X, Y and Z axes.
MTBF	880,000 hours minimum, MIL-HDBK-217F at 25°C. This reliability figure is not a service-life or warranty duration.
Manufacturer warranty	3 years, as stated in the datasheet.
Design and applications	The manufacturer describes the series as low cost. Applications include telecom/datacom systems, wireless networks, industrial control, instruments, analyzers, detectors, data switches and distributed power architectures.

Safety and EMC integration

Safety standards	EAC TP TC 020/2011 approved. UL62368-1 approval excludes the 9 V output models; this model is within that excluded 9 V group.
EMC emission	BS EN/EN55032 (CISPR32): conducted entry N/A; radiated Class B without additional EMC components. The separate immunity test requirements still apply.
EMC immunity	BS EN/EN61000-4-2: level 3, ±8 kV air; -4-3: level 2, 3 V/m; -4-4: level 1, 0.5 kV; -4-5: level 2, 0.5 kV line-to-line; -4-6: level 2, 3 V; -4-8: level 1, 1 A/m.
Immunity input capacitor	When the module must meet BS EN/EN61000-4-4 and -4-5, an external input filter capacitor is required. The datasheet gives Power Mate's recommendation of 470 µF / 100 V for that condition.

Mechanical details and PCB assembly

Construction	SMD package with industry-standard pinout; non-conductive black plastic case rated UL 94V-0.
Dimensions	15.24 × 10.9 × 7.1 mm (L × W × H), as specified. The bottom view on PDF page 9 separately marks 10.7 mm across the body, while the specification and side view state 10.9 mm; use the dimensioned drawing and confirm the supplied outline when designing the footprint.
Pin assignment	Pin 1 −Vin; pin 2 +Vin; pin 5 −Vout; pin 8 +Vout; pins 3, 6, 7, 10, 11 and 12 N.C. Observe the top/bottom view orientation on PDF page 9.
Pin and drawing geometry	PDF page 9: 2.54 mm pin pitch, shown as 2.54 × 5; 11.1 mm lead span and 8.5 mm underside width. The side drawing marks a local vertical reference of 6.7 mm.
Pin dimensions and tolerances	The general note specifies 0.50 × 0.30 mm pins, with ±0.07 mm pin tolerance. The top view separately labels a 0.55 mm pin dimension; confirm the supplied lead geometry when matching the PCB land pattern. General drawing tolerances: x.x ±0.5 mm and x.xx ±0.25 mm.
PCB land pattern	Top-view grid on PDF page 9: 2.54 mm per grid; pads 1.20 × 1.80 mm; the drawing marks 12.00 mm across the pad rows. Match the numbered pads to the specified pin assignment.
Soldering temperature	At 1.5 mm from the case, 240°C maximum for 1–10 seconds.
Reflow soldering	The curve on PDF page 9 applies only to hot-air reflow soldering: peak 240°C for 10 seconds maximum; time above 220°C is 60 seconds maximum.

Packing and available options

Unit weight	1.2 g, the catalog packing reference per unit; not a measured net or shipping weight.
Standard tube packing	32 pieces per tube; 120 tubes and 3,840 pieces per carton. Tube gross weight 0.061 kg; carton gross weight 8.12 kg. These are standard packing references, not the quantity supplied with an individual order.
Tube and carton dimensions	Tube length 525 ±2 mm. Tube profile references: 12.0 ±0.4, 17.0 ±0.4, 13.5 ±0.4, 8.3 ±0.4, 7.7 ±0.3 and 0.55 ±0.2 mm. Carton 620 × 230 × 230 mm (L × W × H).
Optional reel packing	500 pieces per reel, 5 reels / 2,500 pieces per carton; one-box gross weight 1.3 kg and carton gross weight 7.3 kg. Reel diameter 330 mm and width 32 mm; inner box 355 × 338 × 50 mm, outer carton 380 × 290 × 370 mm.
Reel tape dimensions	W 32 mm (+0.3/−0.1); Ao 11.4 ±0.1 mm; Bo 15.5 ±0.1 mm; Ko 7.4 ±0.1 mm; P1 16 ±0.1 mm. Refer to PDF page 10 for cavity orientation.

Installation and system verification

Complete-system EMC verification	Verify EMC with the converter installed in the final equipment and connected to a representative load. Wiring, assembly and the application affect the result. Follow the model's specified EMC conditions and any required external components; the linked EMI testing guidance does not certify the finished equipment.