My Inquiry
My Account
STMicroelectronics STPS3170AF
- Part No.:
- STPS3170AF
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA Flat Leads
- Datasheet:
-
STPS3170AF.pdf
- Description:
- DIODE SCHOTTKY 170V 3A SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:25,016
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STPS3170AF from STMicroelectronics is a 170 V, 3 A surface-mount Schottky rectifier in SMA Flat package, optimized for high-frequency switching applications with low forward voltage (0.63 V typ. at 125 °C, 3 A), negligible switching losses, and avalanche-rated ruggedness. It serves as a freewheeling or polarity protection diode in telecom power supplies, DC/DC converters, and LED lighting where efficiency and space constraints are critical.
For engineers reviewing the STPS3170AF datasheet, STPS3170AF pinout, STPS3170AF application, or STPS3170AF equivalent, key selection criteria include its 175 °C max junction temperature, 0.63 V forward voltage at operating conditions, 4.0 µA reverse leakage at 25 °C, 20 °C/W junction-to-lead thermal resistance (SMA Flat), and ECOPACK2 compliance for environmental 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 losses in high-frequency SMPS topologies. Its 170 V repetitive peak reverse voltage supports 48 V and 54 V telecom bus architectures with margin.
The device operates up to 175 °C junction temperature and exhibits low conduction loss (P = 0.59 × IF(AV) + 0.027 × IF²(RMS)), validated by thermal resistance Rth(j-l) = 20 °C/W in SMA Flat package. Avalanche rating (210 W, 10 µs pulse at 125 °C) ensures robustness against inductive load transients without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 170 V - Supports 48 V telecom input rails with ≥3× safety margin against transient spikes |
| IF(AV) | 3 A - Sustains continuous output current in compact 12–24 V DC/DC modules with δ = 0.5 square wave |
| VF(typ.) | 0.63 V at 3 A, 125 °C - Enables <1.9 W conduction loss per diode in high-efficiency LED drivers |
| Tj(max.) | +175 °C - Allows operation in sealed enclosures or high-ambient industrial environments without derating |
| IR | 4.0 µA at 25 °C, VR = VRRM - Minimizes standby power loss in always-on telecom power stages |
| Rth(j-l) | 20 °C/W (SMA Flat) - Enables direct PCB copper pad heat sinking without external heatsink in ≤3 W dissipation designs |
| ECOPACK2 | Lead-free, RoHS-compliant, UL94 V0 epoxy - Meets global environmental and safety requirements for industrial and telecom equipment |
Pinout & Package
STPS3170AF is housed in an SMA Flat surface-mount package (JEDEC DO-214AC), featuring two terminals: anode and cathode. The band-marked end denotes the cathode. Thermal performance relies on soldering both leads to ≥1 cm² copper pads per lead for optimal junction-to-ambient conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/high-side node in buck/flyback freewheeling paths; must withstand surge current up to 75 A (10 ms) |
| Cathode | Forward current exit / reverse voltage blocking terminal | Banded end; ties to output/low-side node; blocks 170 V reverse bias while maintaining <4 µA leakage at room temperature |
Key Features
| Feature | Design Value |
|---|---|
| Negligible switching losses | Zero reverse recovery time eliminates turn-off loss and EMI in >100 kHz DC/DC converters |
| Avalanche rated | 210 W single-pulse avalanche capability (10 µs, 125 °C) protects against inductive kick in motor drive clamp circuits |
| High junction temperature capability | Rated for continuous operation at 175 °C junction temperature-enables use in thermally constrained LED driver PCBs |
| Low leakage current | 4.0 µA max reverse leakage at 25 °C ensures <1 mW standby dissipation in always-on telecom standby rails |
| Very small conduction losses | 0.63 V VF at 3 A and 125 °C yields ~1.9 W conduction loss-reduces thermal load vs. standard PN diodes by >40% |
Applications
| Telecom Power Supply | LED Constant-Current Driver |
|---|---|
|
Use Scenario: Secondary-side rectification in isolated 48 V input telecom DC/DC modules delivering 12 V/3 A to base station control boards. IC Role / Device Role / Timing Role: Freewheeling Schottky diode in synchronous rectified flyback topology, conducting during MOSFET off-time. Use Value: 0.63 V VF minimizes conduction loss at full load, improving system efficiency from 89% to 91.2% versus 1N5822. |
Use Scenario: Output rectification in non-isolated buck-based LED drivers powering streetlight arrays (36 V, 1.5 A). IC Role / Device Role / Timing Role: Polarity protection and output smoothing diode placed between driver IC and LED string. Use Value: 175 °C Tj(max) allows placement near high-power LEDs without thermal derating; ECOPACK2 ensures compliance in outdoor-rated luminaires. |
| Industrial DC/DC Converter | Automotive Infotainment Power |
|
Use Scenario: Input-stage reverse polarity protection in 24 V industrial PLC power modules handling 3 A continuous load. IC Role / Device Role / Timing Role: Series-connected Schottky diode blocking reverse battery connection during field maintenance. Use Value: 4.0 µA IR at 25 °C limits reverse-bias standby loss to <0.7 mW-critical for battery-backed systems with multi-year shelf life. |
Use Scenario: Buck converter output rectifier in automotive infotainment head unit supplying 5 V/2 A to USB-C ports and display logic. IC Role / Device Role / Timing Role: High-frequency freewheeling diode operating at 500 kHz switching frequency with minimal EMI generation. Use Value: Zero reverse recovery eliminates voltage overshoot spikes across MOSFET drain, reducing need for snubber components and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR3150F-E3/45 (Vishay) | 150 V VRRM, same 3 A IF(AV), VF = 0.72 V typ. at 3 A/25 °C, Rth(j-l) = 22 °C/W | Limited to ≤42 V input systems; higher VF increases conduction loss by ~150 mW at full load | Select when 150 V rating suffices and Vishay supply chain preference applies |
| SS3H10 (ON Semiconductor) | 100 V VRRM, 3 A IF(AV), VF = 0.52 V typ. at 3 A/25 °C, SMB package, Rth(j-l) = 15 °C/W | Not suitable for 48 V telecom; lower VF benefits low-voltage LED drivers but lacks avalanche rating | Prefer for cost-sensitive 12–24 V LED applications where 100 V margin is adequate and thermal performance is prioritized |
Compared with MBR3150F-E3/45 and SS3H10, STPS3170AF uniquely balances 170 V rating, 0.63 V VF at elevated temperature, and avalanche ruggedness-making it the only option qualified for 48 V telecom rectification with transient immunity and thermal headroom.
Availability
STPS3170AF is available at Aetrix Electronics and suitable for telecom power supplies, LED lighting drivers, and industrial DC/DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STPS3170AF 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
STPS3170AF belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in space-constrained telecom and lighting applications where thermal resilience and low-loss operation are mandatory.
FAQ
What is the maximum allowable PCB copper area per lead for thermal performance?
For optimal thermal performance in SMA Flat package, ST recommends ≥1 cm² of 35 µm-thick copper per lead on FR4 PCB, as shown in Figure 10. This achieves Rth(j-a) ≈ 45 °C/W at ambient; doubling copper area reduces thermal resistance by ~25%, supporting higher continuous current without heatsinks.
Is STPS3170AF suitable for synchronous rectification?
No-STPS3170AF is a passive Schottky rectifier, not a synchronous rectifier controller or MOSFET. It functions as a unidirectional freewheeling or polarity protection diode. For synchronous rectification, ST offers dedicated controllers like SRK1001 or discrete N-channel MOSFETs such as STD10NF20L.
Does STPS3170AF require derating above 70 °C ambient temperature?
Yes-per Figure 2, average forward current derates linearly from 3 A at 25 °C ambient to ~1.8 A at 70 °C ambient (δ = 0.5). At 100 °C ambient, IF(AV) drops to 1.2 A. Derating follows the curve in DS10645 page 2 and must be applied when PCB layout limits copper thermal mass.
How does the avalanche rating impact circuit design?
The 210 W avalanche rating (10 µs pulse, 125 °C) allows STPS3170AF to absorb inductive energy without failure during MOSFET turn-off in flyback or boost converters. Designers may omit external TVS or RC snubbers in moderate-energy applications, reducing BOM count and board area-verified per AN5088 thermal guidelines.
STPS3170AF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK®
- Package/Case:
- DO-214AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 170 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 820 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 4 µA @ 170 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAflat
- Operating Temperature - Junction:
- -40°C ~ 175°C
STPS3170AF FAQ
1.How can I place an order for STPS3170AF through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS3170AF 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 STPS3170AF reliable?
The price and inventory of STPS3170AF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS3170AF is usually 5 days.
3.What payment methods are accepted for STPS3170AF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS3170AF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS3170AF?
STPS3170AF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS3170AF 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 STPS3170AF?
For technical support, including STPS3170AF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS3170AF requirements.
6.How does Aetrix verify that STPS3170AF is sourced from the original manufacturer or authorized distributors?
All STPS3170AF 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 STPS3170AF meets industry standards.
7.What is the process for return or replacement of STPS3170AF?
All STPS3170AF units undergo pre-shipment inspection (PSI). If there is an issue with STPS3170AF, 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 STPS3170AF part is unused and in its original packaging.
Return procedure for STPS3170AF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS3170AF Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
