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STMicroelectronics STPR120A
- Part No.:
- STPR120A
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
STPR120A.pdf
- Description:
- DIODE GEN PURP 200V 1A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,740
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Product details
Overview
STPR120A from STMicroelectronics is a high-efficiency fast recovery surface-mount diode optimized for high-frequency switching applications. It delivers 1 A average forward current (IF(AV)), 200 V repetitive peak reverse voltage (VRRM), 0.74 V max forward voltage at 150°C, 35 ns max reverse recovery time (trr), and operates up to 150°C junction temperature - used in SMPS output rectification and DC/DC converter freewheeling paths.
For engineers reviewing the STPR120A datasheet, STPR120A pinout, STPR120A application, or STPR120A equivalent, key selection criteria include low conduction loss (VF ≤ 0.74 V @ 150°C), fast soft recovery (trr ≤ 35 ns), thermal robustness (Tj(max) = 150°C), and SMA package compatibility with automated SMT assembly for compact power stages.
Technical Context
This epitaxial planar fast recovery diode employs a lightly doped drift region and controlled carrier lifetime to achieve soft reverse recovery with minimal ringing and EMI. Its 35 ns trr is specified at IF = 1 A, dIF/dt = 50 A/µs, VR = VRRM, and Irr = 0.25 A, enabling efficient operation in 100–500 kHz DC/DC converters.
Thermal design is supported by Rth(j-l) = 30 °C/W (junction-to-lead), and conduction loss is modeled as P = 0.62 × IF(AV) + 0.12 × IF²(RMS). Reverse leakage remains ≤ 400 µA at 125°C, ensuring stable blocking under elevated ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 1 A at TL = 125°C, δ = 0.5 - defines continuous DC output rectification capability in thermally constrained layouts |
| VRRM | 200 V - supports 12–48 V input bus systems with 1.5× safety margin against transient spikes |
| VF (max) | 0.74 V @ Tj = 150°C, IF = 1 A - enables < 0.75 W conduction loss per diode in 1 A load paths |
| trr (max) | 35 ns @ IF = 1 A, dIF/dt = 50 A/µs - ensures minimal switching loss and reduced EMI in >200 kHz topologies |
| Tj (max) | 150 °C - allows operation in sealed enclosures or high-ambient industrial environments without derating |
| Rth(j-l) | 30 °C/W - enables direct PCB copper pour thermal coupling to improve power density vs. standard DO-214AC parts |
Pinout & Package
SMA (JEDEC DO-214AC) surface-mount package with molded epoxy body, UL94 V0 rated, cathode indicated by band. Dimensions: L = 0.75–1.60 mm, D = 2.25–2.95 mm, E = 4.80–5.60 mm, E1 = 3.95–4.60 mm, A1 = 1.90–2.03 mm, b = 1.25–1.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to switch node or transformer secondary in flyback/freewheeling configurations |
| Cathode | Forward current exit / reverse blocking terminal | Banded end; ties to output rail or ground return path; determines polarity protection orientation |
Key Features
| Feature | Design Value |
|---|---|
| Very low switching losses | trr ≤ 35 ns + soft recovery waveform minimizes turn-off energy and snubber requirements |
| Low forward voltage drop | VF ≤ 0.74 V @ 150°C reduces conduction loss by ~15% vs. standard FRDs at same current |
| Fast rectifier epitaxial structure | Controlled lifetime doping enables predictable trr and low Qrr across temperature |
| Surface mount package | SMA footprint supports high-density layout and reflow-compatible manufacturing |
Applications
| Switched-Mode Power Supply Output Rectification | DC/DC Converter Freewheeling Diode |
|---|---|
Use Scenario: Secondary-side rectification in 24 V input, 5 V/3 A isolated flyback converter operating at 250 kHz. IC Role / Device Role / Timing Role: Unidirectional current path during transformer demagnetization; conducts only during off-time of primary switch. Use Value: 35 ns trr limits reverse recovery charge (Qrr) to < 20 nC, reducing voltage overshoot and MOSFET stress. | Use Scenario: Freewheeling path in synchronous buck converter with 12 V input, 3.3 V/10 A output. IC Role / Device Role / Timing Role: Provides low-loss current recirculation when high-side FET is off; blocks reverse current during on-time. Use Value: 0.74 V VF at 150°C keeps forward drop below 0.8 V, minimizing conduction loss in high-current, low-Vout rails. |
| Polarity Protection Circuit | High-Frequency Inverter Output Stage |
Use Scenario: Reverse-voltage protection in 12 V automotive USB-C PD adapter input stage. IC Role / Device Role / Timing Role: Series-connected anode-in configuration; blocks reverse battery connection while passing forward current. Use Value: 200 V VRRM provides 2× margin over 12 V nominal with load dump transients; 180 µA IR at 125°C ensures low standby leakage. | Use Scenario: Output rectification in 48 V to 400 V boost inverter for solar microinverter DC link. IC Role / Device Role / Timing Role: High-speed unidirectional conduction during high-dI/dt switching transitions in 100–300 kHz PWM. Use Value: Soft recovery behavior suppresses voltage spikes >200 V, eliminating need for RC snubbers in compact designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R02 | Same SMA package; trr = 30 ns (typ), VF = 0.72 V @ 150°C; lower Qrr but higher cost | Preferred where EMI reduction is critical; slightly tighter trr distribution improves consistency in parallel arrays | Select for noise-sensitive medical or audio power supplies requiring lowest possible recovery overshoot |
| SS12 | SMA package; IF(AV) = 1 A, VRRM = 200 V, trr = 50 ns (max), VF = 0.85 V @ 25°C - higher VF and slower recovery | Acceptable in lower-frequency (<100 kHz) or cost-driven consumer applications | Choose only if thermal margin exceeds 25°C and switching frequency is below 120 kHz |
Compared with STTH1R02, STPR120A trades 5 ns trr and 0.02 V VF for lower unit cost and broader legacy qualification; versus SS12, it delivers measurable efficiency gain in 200+ kHz designs due to faster recovery and lower high-temp VF.
Availability
STPR120A is available at Aetrix Electronics and suitable for switched-mode power supplies, DC/DC converters, polarity protection circuits, and high-frequency inverters requiring stable component supply and long-term manufacturability.
Supply support for STPR120A 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
STPR120A belongs to ST's high-efficiency fast recovery diode product line, engineered specifically for high-frequency power conversion where low VF, fast trr, and thermal resilience are essential in space-constrained SMT designs.
FAQ
Is STPR120A still in active production?
No - STPR120A is marked as "Obsolete Product(s)" in the official ST datasheet revision history (Rev. 4, Aug-2004). However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for design continuity, including validated drop-in alternatives and thermal redesign guidance.
What is the maximum recommended PCB copper area for thermal relief?
Per Figure 5 in the datasheet, a minimum 100 mm² (10 mm × 10 mm) 35 µm copper pour on the component side, connected directly to both leads via multiple thermal vias, achieves Rth(j-a) ≈ 120 °C/W - sufficient for 1 A continuous operation at 50°C ambient with no forced airflow.
Can STPR120A be used in parallel configurations?
Yes, but only with matched VF and trr units and symmetrical PCB layout. The datasheet does not guarantee inherent current sharing; external ballast resistors (0.05 Ω per diode) or forced-air cooling is advised for >2 A total current to prevent thermal runaway due to positive TC of VF.
Does STPR120A meet RoHS or REACH requirements?
The original 2004 datasheet predates mandatory RoHS compliance, and no Pb-free or halogen-free markings appear in ordering information. Aetrix Electronics confirms current stock is legacy leaded (SnPb) SMA packaging; RoHS-compliant alternatives (e.g., STTH1R02) are available upon request with full material declarations.
STPR120A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 940 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 3 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- 150°C (Max)
STPR120A FAQ
1.How can I place an order for STPR120A through Aetrix?
Please submit a Request for Quotation (RFQ) for STPR120A 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 STPR120A reliable?
The price and inventory of STPR120A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPR120A is usually 5 days.
3.What payment methods are accepted for STPR120A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPR120A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPR120A?
STPR120A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPR120A 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 STPR120A?
For technical support, including STPR120A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPR120A requirements.
6.How does Aetrix verify that STPR120A is sourced from the original manufacturer or authorized distributors?
All STPR120A 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 STPR120A meets industry standards.
7.What is the process for return or replacement of STPR120A?
All STPR120A units undergo pre-shipment inspection (PSI). If there is an issue with STPR120A, 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 STPR120A part is unused and in its original packaging.
Return procedure for STPR120A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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