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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Infineon Technologies D121N12BXPSA1

Name: D121N12BXPSA1
Brand: Infineon Technologies
SKU: D121N12BXPSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: D121N12BXPSA1

Manufacturer:: Infineon Technologies

Category:: Single Diodes

Package:: DO-205AA, DO-8, Stud

Datasheet:: D121N12BXPSA1.pdf

Description:: DIODE GEN PURP 1.2KV 230A

Quantity:: RFQ Add To RFQ list

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Inventory:3,358

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Product details

Overview

D121N12BXPSA1 from Infineon Technologies (formerly EUPEC) is a 1200 V, 360 A RMS power rectifier diode in a press-pack (B-type) package with double-sided cooling capability and anode-to-case polarity. It features a maximum junction temperature of 180 °C, thermal resistance R_thJC of 0.324 °C/W, and forward voltage drop of 2.14 V at 700 A and T_vj = 180 °C. It is used in high-power industrial DC drives and medium-voltage traction converters.

For engineers reviewing the D121N12BXPSA1 datasheet, D121N12BXPSA1 pinout, D121N12BXPSA1 application, or D121N12BXPSA1 equivalent, key selection criteria include repetitive peak reverse voltage (V_RRM = 1200 V), surge current rating (I_FSM = 3.1 kA), I²t capability (48.1 kA²s), thermal interface requirements (R_thCK ≤ 0.04 °C/W), and pressure-contact Si pellet construction.

Technical Context

This device is a stud-mounted, double-sided cooled, press-pack power diode designed for forced-air or liquid-cooled high-current rectification. Its silicon pellet uses a planar junction structure with gateless, uncontrolled conduction and no recovery control - characteristic of standard power rectifiers.

It operates with anode connected to the case (case-positive configuration), requiring insulated mounting hardware when the heatsink is grounded. The 15 mm diameter Si die and M12 threaded stud support mechanical clamping forces up to 20 Nm, ensuring stable thermal contact under high-vibration conditions (50 Hz, 50 m/s²).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Maximum repetitive reverse blocking voltage; defines usable DC link voltage range in 3-phase bridge rectifiers.
I_FRMSM	360 A - RMS forward current rating; determines continuous conduction capability under sinusoidal or distorted load currents.
I_FAVM	120 A at T_c = 130 °C - Mean forward current; sets average power dissipation limit with specified case temperature.
V_T	2.14 V at 700 A, T_vj = 180 °C - On-state voltage; directly impacts conduction loss and thermal design margin.
R_thJC	0.324 °C/W - Junction-to-case thermal resistance; used with measured case temperature to calculate real-time junction temperature.
I_FSM	3.1 kA (10 ms, T_vj = 25 °C) - Non-repetitive surge current; defines short-circuit withstand in motor drive DC links.
Q_r	Not specified - No reverse recovery charge data provided; confirms device is non-controlled, soft-recovery rectifier without snubber dependency.

Pinout & Package

Package: Press-pack B-type housing with M12 threaded anode stud, cathode terminal via insulated rope (blue), anode-to-case polarity, and double-sided cooling interface. Weight: 175 g. Creepage distance: 12 mm. Humidity class: DIN 40040 C.

Pin/Terminal	Circuit Role	Design Meaning
Anode (M12 stud)	High-side current entry	Mechanically robust, torque-controlled connection (20 Nm); electrically and thermally coupled to case; requires isolation if heatsink is grounded.
Cathode (blue E-Cu rope)	Low-side current exit	Flexible 25 mm² copper rope; enables strain relief and vibration-tolerant routing in high-dynamic environments.
Case (housing)	Anode reference / thermal path	Electrically active anode node; primary heat extraction surface for double-sided cooling; must be flat, clean, and thermally greased.

Key Features

Feature	Design Value
Double-sided cooling interface	Enables 2× thermal path area vs. single-sided packages; reduces total thermal resistance by ~15% in optimized heatsink assemblies.
15 mm Si pellet with pressure contact	Eliminates wire bonds and solder layers; improves long-term thermal cycling reliability and current sharing in parallel configurations.
180 °C maximum junction temperature	Supports operation in high-ambient industrial enclosures without derating below 130 °C case temperature.
M12 anode stud with 20 Nm torque spec	Ensures repeatable clamping force and interfacial thermal resistance across production batches and field maintenance cycles.

Applications

Industrial DC Drive Rectifier

Rail Traction Converter

Use Scenario: Three-phase 6-pulse rectification feeding 600–900 V DC link in 2–5 MW variable-speed motor drives for extruders and rolling mills.

IC Role / Device Role / Timing Role: Uncontrolled power rectifier providing bidirectional thermal path and high I²t withstand during line faults.

Use Value: 360 A RMS rating and 3.1 kA surge capacity enable direct replacement of legacy 1000 V diodes without heatsink redesign.

Use Scenario: Line-side rectification in 1.5 kV DC overhead catenary-fed traction converters for regional EMUs.

IC Role / Device Role / Timing Role: Main AC/DC conversion stage operating at 50/60 Hz with 200 ms overload capability per EN 50124.

Use Value: 1200 V V_RRM provides 20% voltage margin over nominal 1.5 kV rail systems, reducing failure risk during transient overvoltages.

Medium-Voltage UPS Input Stage

High-Power Welding Power Supply

Use Scenario: 400 V AC input rectification in 500 kVA modular UPS systems with active harmonic cancellation.

IC Role / Device Role / Timing Role: High-current, low-loss rectifier in 12-pulse configuration with phase-shifted transformers.

Use Value: 0.324 °C/W R_thJC allows 15 K/W heatsink + fan system to sustain full load at 40 °C ambient.

Use Scenario: Primary rectification in 1000 A DC welding power supplies with 100% duty cycle intermittent loading.

IC Role / Device Role / Timing Role: Main current-handling element subjected to 10–100 ms pulses at >2 kA peak.

Use Value: 48.1 kA²s I²t rating exceeds EN 60974-1 short-circuit energy requirements by 2.3×.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current power rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IXYS MDD120-16N1	V_RRM = 1600 V; I_FRMS = 320 A; R_thJC = 0.35 °C/W; same B-package footprint.	Higher voltage rating but lower RMS current; suitable where system overvoltage margin >400 V is prioritized over conduction loss.	Select when V_RRM headroom is critical and thermal budget permits 0.026 °C/W higher R_thJC.
STMicroelectronics D600S1600HB	V_RRM = 1600 V; I_FRMS = 340 A; R_thJC = 0.33 °C/W; requires different mounting hardware (M10 stud).	Higher voltage and slightly lower RMS rating; validated for railway EN 50155 thermal cycling profiles.	Prefer for rail-certified designs where 1600 V blocking and compliance documentation are mandatory.

Compared with D121N12BXPSA1, MDD120-16N1 trades 40 A RMS capacity for 400 V extra blocking margin and slightly worse thermal resistance, while D600S1600HB offers rail-specific qualification at the cost of reduced current rating and non-interchangeable mechanical interface.

Availability

D121N12BXPSA1 is available at Aetrix Electronics and suitable for industrial DC drives, rail traction converters, medium-voltage UPS systems, and high-power welding supplies requiring stable component supply and long-lifecycle support.

Supply support for D121N12BXPSA1 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power, sensor, and automotive ICs, with leadership in high-power discrete devices since acquiring EUPEC in 2002.

This part belongs to Infineon's high-current press-pack diode product line, engineered for reliability in mission-critical industrial rectification where thermal stability, surge robustness, and mechanical durability are non-negotiable.

FAQ

What is the correct mounting torque for the M12 anode stud?

The specified tightening torque for the M12 anode stud is 20 Nm. This value ensures optimal interfacial thermal contact and mechanical stability without damaging the pressure-contact Si pellet. Torque must be applied using a calibrated tool on clean, dry threads; lubrication or anti-seize compounds are not recommended unless explicitly qualified by Infineon's application notes.

Does D121N12BXPSA1 have reverse recovery characteristics suitable for high-frequency switching?

No - D121N12BXPSA1 is a standard power rectifier diode without controlled recovery. It exhibits soft, unoptimized reverse recovery behavior and is intended for line-frequency (50/60 Hz) or low-frequency (<400 Hz) rectification only. It must not be used in high-frequency SMPS or inverter freewheeling roles where fast or soft recovery is required.

Can this diode be paralleled for higher current handling?

Yes - its pressure-contact construction and matched V_F tolerance support parallel operation. However, forced current sharing via individual ballast resistors or interleaved busbar layout is mandatory. Thermal coupling between units must be symmetrical, and case temperature monitoring at each device is required to prevent thermal runaway under unbalanced loads.

What is the maximum allowable case temperature for continuous operation?

The maximum allowable case temperature for continuous operation is 130 °C, at which the mean forward current rating (I_FAVM) is 120 A. Exceeding 130 °C requires linear derating per the datasheet curve; operation above 180 °C junction temperature is prohibited regardless of case temperature, as it risks irreversible degradation of the Si junction.

D121N12BXPSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: DO-205AA, DO-8, Stud

Packaging:: Bulk

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1200 V

Current - Average Rectified (Io):: 230A

Voltage - Forward (Vf) (Max) @ If:: -

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 20 mA @ 1200 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Stud Mount

Supplier Device Package:: -

Operating Temperature - Junction:: -40°C ~ 180°C

D121N12BXPSA1 FAQ

1.How can I place an order for D121N12BXPSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for D121N12BXPSA1 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 D121N12BXPSA1 reliable?

The price and inventory of D121N12BXPSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D121N12BXPSA1 is usually 5 days.

3.What payment methods are accepted for D121N12BXPSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D121N12BXPSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D121N12BXPSA1?

D121N12BXPSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D121N12BXPSA1 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 D121N12BXPSA1?

For technical support, including D121N12BXPSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D121N12BXPSA1 requirements.

6.How does Aetrix verify that D121N12BXPSA1 is sourced from the original manufacturer or authorized distributors?

All D121N12BXPSA1 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 D121N12BXPSA1 meets industry standards.

7.What is the process for return or replacement of D121N12BXPSA1?

All D121N12BXPSA1 units undergo pre-shipment inspection (PSI). If there is an issue with D121N12BXPSA1, 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 D121N12BXPSA1 part is unused and in its original packaging.

Return procedure for D121N12BXPSA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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