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STMicroelectronics STPS2170AFN
- Part No.:
- STPS2170AFN
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
STPS2170AFN.pdf
- Description:
- DIODE SCHOTTKY 170V 2A SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:3,477
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Product details
Overview
STPS2170AFN from STMicroelectronics is a 170 V, 2 A surface-mount Schottky rectifier in SMA Flat Notch package, optimized for high-frequency DC/DC converters and telecom power supplies. It delivers low conduction loss (VF = 0.62 V @ 125 °C, 2 A), negligible switching losses, and operates up to 175 °C junction temperature - enabling compact, efficient LED lighting and SMPS designs.
For engineers reviewing the STPS2170AFN datasheet, STPS2170AFN pinout, STPS2170AFN application, or STPS2170AFN equivalent, key selection criteria include reverse voltage rating (170 V), thermal resistance (Rth(j-l) = 20 °C/W), avalanche rating (165 W @ 10 µs), leakage current (<2.8 µA @ 25 °C), and ECOPACK2 compliance for RoHS- and halogen-free design.
Technical Context
This Schottky rectifier uses a planar silicon structure with metal–semiconductor junction to eliminate minority-carrier storage delay, enabling zero reverse recovery time and minimal switching loss in high-frequency topologies. Its low forward voltage drop and high-temperature capability stem from optimized anode metallization and thermally robust die attach.
The device is rated for repetitive avalanche energy (165 W at 10 µs, Tj = 125 °C) and features low junction-to-lead thermal resistance (20 °C/W), supporting reliable operation without active cooling in space-constrained telecom and LED driver PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 170 V - maximum repetitive reverse voltage; defines safe blocking capability in DC/DC flyback or buck-boost stages |
| IF(AV) | 2 A - average forward current at TL = 145 °C; sets continuous output current limit in 12–48 V telecom supplies |
| VF(typ.) | 0.62 V @ 125 °C, 2 A - low conduction loss enables >95% efficiency in 100–500 kHz converters |
| Tj(max.) | 175 °C - extended junction temperature allows operation in sealed enclosures or high-ambient environments |
| Rth(j-l) | 20 °C/W - enables direct PCB copper pad heat sinking; no heatsink required for ≤2 A continuous load |
| IR(max) | 2.8 mA @ 125 °C, VR = VRRM - low leakage preserves standby power in always-on LED drivers |
| PARM | 165 W @ tp = 10 µs - avalanche-rated for transient overvoltage survival in unregulated input stages |
Pinout & Package
STPS2170AFN is housed in the SMA Flat Notch package - a surface-mount, lead-free, UL94 V0 epoxy case with cathode band marking and optimized thermal pad geometry for conduction cooling. Dimensions: D = 2.25–2.90 mm, E = 5.00–5.35 mm, E1 = 3.95–4.60 mm, L = 0.75–1.20 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input rail or switch node; low-resistance metallization minimizes I²R loss |
| Cathode | Forward current exit / reverse-blocking terminal | Banded side; ties to output filter capacitor or ground return; handles full reverse voltage stress |
Key Features
| Feature | Design Value |
|---|---|
| Negligible switching losses | Zero reverse recovery charge (Qrr ≈ 0) eliminates turn-off loss and EMI in >200 kHz converters |
| Avalanche rated | Withstands 165 W transient avalanche energy (10 µs pulse), protecting against inductive kick in SMPS freewheeling paths |
| High junction temperature capability | Rated for continuous operation up to 175 °C junction temperature - supports derating-free design in thermally dense LED modules |
| Low leakage current | <2.8 µA @ 25 °C, <2.8 mA @ 125 °C - preserves efficiency in standby and dimming modes of smart lighting systems |
| ECOPACK2 compliance | Halogen-free, RoHS-compliant packaging meets IEC 61249-2-21 and JEDEC J-STD-020 standards for industrial and telecom use |
Applications
| Telecom Power Supply | LED Lighting Driver |
|---|---|
Use Scenario: Secondary-side rectification in 48 V input, isolated DC/DC converters for base station power modules. IC Role / Device Role / Timing Role: High-frequency Schottky rectifier replacing fast recovery diodes to reduce conduction + switching loss. Use Value: Enables 94–96% efficiency at 300 kHz switching frequency while maintaining <75 °C board temperature rise. | Use Scenario: Output rectification in constant-current LED drivers for streetlight and architectural lighting. IC Role / Device Role / Timing Role: Freewheeling diode in buck-derived topologies operating at 100–500 kHz. Use Value: Low VF and high Tj rating allow full 2 A output in compact, sealed aluminum housings without forced air. |
| SMPS Freewheeling Diode | Polarity Protection Circuit |
Use Scenario: Freewheeling path in non-isolated buck converters powering FPGA core rails (1.2–3.3 V). IC Role / Device Role / Timing Role: Low-loss path for inductor current during high-side switch off-time. Use Value: Reduces power dissipation by 40% vs. standard PN diodes, lowering thermal stress on adjacent ICs. | Use Scenario: Reverse-polarity protection in 12–24 V industrial control inputs and PoE-powered devices. IC Role / Device Role / Timing Role: Series-connected Schottky diode blocking reverse voltage while minimizing forward drop. Use Value: Limits voltage loss to <0.7 V at full load, preserving headroom for downstream LDOs and microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MBR2170F-E3/45 | Same 170 V VRRM, 2 A IF(AV), but VF = 0.85 V @ 25 °C (higher conduction loss); Rth(j-l) = 25 °C/W | Suitable for lower-frequency (<100 kHz) SMPS where thermal margin exists | Prefer STPS2170AFN when efficiency >95% or ambient >85 °C is required |
| Vishay VS-2EY170-M3/54 | 170 V VRRM, 2 A IF(AV), VF = 0.72 V @ 125 °C; not avalanche rated; Rth(j-l) = 22 °C/W | Lacks avalanche ruggedness - unsuitable for unclamped inductive transients | Select STPS2170AFN for telecom or industrial DC/DC with variable input or surge exposure |
Compared with MBR2170F-E3/45 and VS-2EY170-M3/54, STPS2170AFN provides superior thermal performance (20 °C/W), lower VF at elevated temperature, and verified avalanche energy handling - making it optimal for high-reliability, high-efficiency, and thermally constrained applications.
Availability
STPS2170AFN is available at Aetrix Electronics and suitable for telecom power supplies, LED lighting drivers, SMPS freewheeling circuits, and polarity protection applications requiring stable component supply and long-term lifecycle support.
Supply support for STPS2170AFN 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.
The STPS2170AFN belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for efficiency-critical, high-frequency power conversion in space- and thermal-constrained applications.
FAQ
What is the maximum allowable PCB copper area for optimal thermal performance of STPS2170AFN?
The datasheet specifies that Rth(j-a) drops to ~4.5 °C/W with ≥2 cm² of 35 µm copper per lead on FR4. For SMA Flat Notch, a minimum 3.12 mm × 5.52 mm footprint (per Figure 13) with thermal vias to inner layers is recommended to sustain 2 A continuous at 70 °C ambient.
Is STPS2170AFN suitable for synchronous rectification replacement?
No - STPS2170AFN is a passive Schottky diode, not a MOSFET-based synchronous rectifier. It lacks gate control and cannot be actively switched. It serves as a self-commutated rectifier in conventional topologies where simplicity and reliability outweigh the ~2–3% efficiency gain of synchronous designs.
Does STPS2170AFN require derating above 70 °C ambient temperature?
Yes - Figure 2 shows IF(AV) decreases linearly from 2 A at 25 °C ambient to ~1.3 A at 100 °C ambient (δ = 0.5, SMA Flat Notch). Derating must follow the published curve; exceeding 145 °C lead temperature violates absolute maximum ratings and risks solder joint failure.
How does the SMA Flat Notch package differ electrically from SMA Flat?
Electrically identical - both packages share identical die, VRRM, VF, IR, and avalanche ratings. The Notch variant adds a mechanical cutout for improved visual cathode identification and slightly modified lead geometry (G/G1 dimensions), but no electrical parameter differs per DS10644 Rev 2.
STPS2170AFN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 170 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 820 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 2.8 µA @ 170 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAflat Notch
- Operating Temperature - Junction:
- 175°C
STPS2170AFN FAQ
1.How can I place an order for STPS2170AFN through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS2170AFN 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 STPS2170AFN reliable?
The price and inventory of STPS2170AFN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS2170AFN is usually 5 days.
3.What payment methods are accepted for STPS2170AFN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS2170AFN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS2170AFN?
STPS2170AFN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS2170AFN 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 STPS2170AFN?
For technical support, including STPS2170AFN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS2170AFN requirements.
6.How does Aetrix verify that STPS2170AFN is sourced from the original manufacturer or authorized distributors?
All STPS2170AFN 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 STPS2170AFN meets industry standards.
7.What is the process for return or replacement of STPS2170AFN?
All STPS2170AFN units undergo pre-shipment inspection (PSI). If there is an issue with STPS2170AFN, 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 STPS2170AFN part is unused and in its original packaging.
Return procedure for STPS2170AFN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS2170AFN Tags
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