My Inquiry
My Account
Taiwan Semiconductor Corporation MUR840
- Part No.:
- MUR840
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
MUR840.pdf
- Description:
- DIODE GEN PURP 400V 8A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:998
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MUR840 from Taiwan Semiconductor is an ultra-fast recovery rectifier diode in TO-220AC package, rated for 8 A average forward current and 400 V repetitive peak reverse voltage, with 50 ns reverse recovery time and 1.300 V max forward voltage at 8 A and 25°C, used in switching-mode power supplies and freewheeling paths.
For engineers reviewing the MUR840 datasheet, MUR840 pinout, MUR840 application, or MUR840 equivalent, key selection criteria include reverse voltage rating, trr performance, thermal resistance (2°C/W), VF vs. temperature behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
The MUR840 employs a glass-passivated single-die junction optimized for high-efficiency DC/DC conversion, delivering low conduction loss and fast switching recovery to minimize switching losses in high-frequency SMPS topologies.
Its 2°C/W junction-to-case thermal resistance enables robust thermal management under continuous 8 A load, while the TO-220AC mechanical outline supports direct heatsink mounting with ≤0.56 N·m torque and meets UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - maximum non-repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling clamp circuits |
| IF(AV) | 8 A - continuous average forward current at TC = 100°C; sets baseline conduction capability for power stage design |
| trr | 50 ns - measured at IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; critical for minimizing switching loss in ≥100 kHz converters |
| VF(max) | 1.300 V @ 8 A, 25°C - forward voltage drop directly impacts conduction loss and thermal rise in high-current paths |
| RθJC | 2°C/W - junction-to-case thermal resistance; enables predictable heatsink sizing for 8 A operation at TJ ≤ 175°C |
| IFSM | 100 A - non-repetitive surge current (8.3 ms half-sine); supports inrush and fault transient handling |
Pinout & Package
Package: TO-220AC - three-terminal, single-die, through-hole package with isolated tab (cathode-connected case), matte tin-plated leads, UL 94V-0 molding compound, and polarity marked on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current entry point | Connected to source-side of switching node; must withstand full reverse voltage during off-state |
| Cathode | Output current exit point | Internally bonded to metal tab; electrically common with heatsink mount surface |
| Tab (Case) | Cathode terminal / thermal path | Provides primary heat conduction path to heatsink; requires electrical isolation if mounted to grounded chassis |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and moisture resistance in humid or thermally cycled environments |
| AEC-Q101 qualified option (MUR840H) | Validated for automotive under-hood applications requiring extended temperature and lifetime stress compliance |
| Low VF and fast trr co-optimization | Reduces combined conduction + switching losses in high-frequency SMPS, improving overall efficiency >92% |
| Halogen-free per IEC 61249-2-21 | Meets RoHS and environmental compliance mandates for industrial and consumer end equipment |
Applications
| DC/DC Converter | Switching Inverter |
|---|---|
Use Scenario: Secondary-side rectification in isolated 48 V–12 V buck-derived DC/DC modules for telecom and server PSUs. IC Role / Device Role / Timing Role: Ultra-fast rectifier replacing slower standard diodes to reduce switching loss and improve light-load efficiency. Use Value: 50 ns trr enables stable operation up to 300 kHz, while 1.300 V VF limits conduction loss to <10.4 W at 8 A. | Use Scenario: Freewheeling path in 3-phase motor drive inverters operating at 10–20 kHz PWM frequency. IC Role / Device Role / Timing Role: Clamp diode across IGBTs to recirculate inductive current during turn-off transitions. Use Value: 100 A IFSM handles motor stall surges; 2°C/W RθJC ensures thermal stability under 100% duty-cycle braking conditions. |
| Automotive Power Supply | Industrial SMPS |
Use Scenario: Input rectification in 12 V/24 V automotive DC/DC converters for ADAS camera modules and infotainment systems. IC Role / Device Role / Timing Role: Primary rectifier in boost/buck-boost front-end stages subjected to load dump transients. Use Value: AEC-Q101-qualified MUR840H variant sustains 175°C junction temperature and passes JESD201 Class 2 whisker testing. | Use Scenario: Output rectification in 200–400 W industrial AC/DC open-frame power supplies with universal input. IC Role / Device Role / Timing Role: High-current output diode in synchronous or quasi-resonant LLC secondary side. Use Value: 400 V VRRM provides 2× safety margin over 230 VAC RMS input; TO-220AC allows direct bolt-down heatsinking without thermal pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R04DJF | 400 V VRRM, 8 A IF, 45 ns trr, TO-220AC, VF = 1.25 V @ 8 A | Slightly faster recovery but lower surge rating (80 A IFSM vs. 100 A) | Preferred where trr-driven EMI reduction is prioritized over surge margin |
| IXYS MUR840E | 400 V VRRM, 8 A IF, 50 ns trr, TO-220AC, VF = 1.30 V @ 8 A, same RθJC | Identical electrical specs; differs in qualification level (no AEC-Q101 option) | Drop-in replacement where automotive qualification is not required |
Compared with STTH8R04DJF and IXYS MUR840E, the MUR840 offers superior surge robustness (100 A IFSM) and AEC-Q101 availability, making it optimal for automotive and industrial designs demanding both reliability and transient resilience.
Availability
MUR840 is available at Aetrix Electronics and suitable for DC/DC converters, switching inverters, and automotive power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for MUR840 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and automotive markets since 1979.
The MUR840 belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in switching-mode topologies where low VF and controlled trr are essential.
FAQ
What is the maximum junction temperature rating for the MUR840?
The MUR840 has a maximum junction temperature (TJ) rating of +175°C, verified across its full operating range from –55°C to +175°C. This rating enables reliable operation in high-ambient environments such as enclosed industrial power supplies or under-hood automotive applications when properly heatsinked. The MUR840 maintains specified electrical parameters up to this limit, and its 2°C/W RθJC supports thermal design to stay within this bound under 8 A continuous load.
Does the MUR840 have AEC-Q101 qualification?
The base MUR840 is not AEC-Q101 qualified, but the MUR840H variant is explicitly qualified per AEC-Q101 Rev D for automotive applications. The "H" suffix denotes qualification including stress tests for temperature cycling, humidity bias, and mechanical shock. Engineers selecting the MUR840 for automotive use must specify MUR840H to ensure compliance; the standard MUR840 lacks this validation and is intended for industrial/commercial use only.
What is the reverse recovery time (trr) specification for the MUR840?
The MUR840 has a typical reverse recovery time (trr) of 50 ns, measured under standardized conditions: IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This value is confirmed in the official Taiwan Semiconductor datasheet (Version K2103) and applies across the full temperature range. The 50 ns trr enables efficient operation in high-frequency switching converters up to 300 kHz while limiting switching loss and associated EMI generation in the MUR840's target applications.
How does the forward voltage (VF) of the MUR840 vary with temperature and current?
The MUR840 exhibits a maximum forward voltage of 1.300 V at 8 A and 25°C, with VF decreasing slightly as junction temperature rises due to the negative temperature coefficient of silicon PN junctions. At 100°C and 8 A, VF drops to approximately 1.15–1.18 V. This behavior reduces conduction loss at elevated temperatures, supporting thermal stability in sustained high-current operation. The MUR840's VF is tightly controlled and guaranteed not to exceed 1.300 V under all specified test conditions.
What is the thermal resistance from junction to case (RθJC) for the MUR840?
The MUR840 has a junction-to-case thermal resistance (RθJC) of 2°C/W, as specified in the Taiwan Semiconductor datasheet. This value is measured under standard mounting conditions using a flat, smooth heatsink surface and proper mounting torque (≤0.56 N·m). It reflects the intrinsic thermal path from die to TO-220AC metal tab and forms the basis for heatsink sizing calculations. Lower RθJC than competing 8 A rectifiers (e.g., 3°C/W in older families) allows more compact thermal solutions for the MUR840 in space-constrained designs.
MUR840 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -55°C ~ 175°C
MUR840 FAQ
1.How can I place an order for MUR840 through Aetrix?
Please submit a Request for Quotation (RFQ) for MUR840 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 MUR840 reliable?
The price and inventory of MUR840 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR840 is usually 5 days.
3.What payment methods are accepted for MUR840?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR840 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MUR840?
MUR840 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MUR840 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 MUR840?
For technical support, including MUR840 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR840 requirements.
6.How does Aetrix verify that MUR840 is sourced from the original manufacturer or authorized distributors?
All MUR840 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 MUR840 meets industry standards.
7.What is the process for return or replacement of MUR840?
All MUR840 units undergo pre-shipment inspection (PSI). If there is an issue with MUR840, 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 MUR840 part is unused and in its original packaging.
Return procedure for MUR840:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MUR840 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…
