2SA1943OTU
onsemi
TRANS PNP 250V 17A TO264-3
MOQ 1 · Tube · RoHS · EIA-481 · DAP/DDP · T/T
Technical specifications
| Parameter / Attribute | Specification / Value |
|---|---|
| Mounting | Through Hole |
| FET type | PNP |
| Voltage - collector emitter breakdown | 250 V |
| Current - collector (Ic) | 17 A |
| Current - collector cutoff | 5µA (ICBO) |
| DC current gain (hFE) (Min) @ ic, vce | 80 @ 1A, 5V |
| Power - max | 150 W |
| Frequency - transition | 30MHz |
| Operating temperature | -50°C ~ 150°C (TJ) |
| Package | Tube |
| Case | TO-264-3, TO-264AA |
| Vce saturation (Max) @ ib, ic | 3V @ 800mA, 8A |
Need Stock or a Drop-in Second-Source for 2SA1943OTU?
Package: TO-3P(L) · Pin-compatible replacements with immediate Shenzhen spot stock
The 2SC5200 (NPN) and 2SA1943 (PNP) pair is the default output stage of generations of audio amplifiers, and it is one of the most counterfeited transistor families in the world - relabeled and re-died parts circulate heavily through marketplaces. Genuine Toshiba supply continues under the TTC5200 / TTA1943 part numbers with identical ratings, and the ON Semiconductor (onsemi) NJW0281G / NJW0302G and MJL21194 / MJL21193 pairs are the established second sources. For repair desks the hard problem is not finding a part - it is finding one that is not a relabel.
Verified Pin-Compatible Replacements (6 verified alternatives)
The Official Continuation Line - Authenticity Without Guesswork
Shenzhen Spot Stock (24-48h Dispatch)
Same die family and ratings as the 2SC5200: 230V VCEO, 15A, 150W at TC=25 degC, VCE(sat) 3V max at 8A. Delivered as a single hFE rank (80-160) with lower output capacitance (240pF versus 360pF) for better complementary matching.
VCBO 230V; IC 15A; IB 1.5A; TJ 150 degC max; fT 30MHz class.
PNP Complement of the Continuation Line
Shenzhen Spot Stock (24-48h Dispatch)
The PNP member of the TTC5200/TTA1943 pair: -230V VCEO, -15A, 150W, single hFE rank 80-160.
VCBO -230V; IC -15A; TJ 150 degC max.
Established Western Second Source
Shenzhen Spot Stock (24-48h Dispatch)
NPN of the onsemi audio pair: 250V VCEO, 15A (30A peak), 150W, hFE 75-150, fT about 30MHz - the closest electrical match to the 2SC5200 among the second sources.
VCEO 250V; VCBO 250V; RthJC 0.83 degC/W; TJ -65 to +150 degC.
PNP Complement of the onsemi Pair
Shenzhen Spot Stock (24-48h Dispatch)
The PNP member: -250V, -15A, 150W, hFE 75-150 - replaces the 2SA1943 position with extra voltage margin.
VCEO -250V; RthJC 0.83 degC/W; TJ -65 to +150 degC.
More Dissipation, Slower Device
Shenzhen Spot Stock (24-48h Dispatch)
NPN rated 250V, 16A, 200W with a much lower transition frequency: fT 4MHz minimum versus roughly 30MHz for the original - excellent for output stages at high bias, different in fast designs.
VCEO 250V; VCBO 400V; IC 16A (30A peak); RthJC 0.7 degC/W; hFE 25-75 at 8A.
PNP Complement of the 200W Grade
Shenzhen Spot Stock (24-48h Dispatch)
The PNP member: -250V, -16A, 200W, fT 4MHz class - replaces the 2SA1943 position where more dissipation headroom is wanted.
VCEO -250V; VCBO -400V; RthJC 0.7 degC/W.
Buyer & Quality Checklist for Sourcing Alternatives
- Buy the pair from one production lot: complementary matching of hFE and VBE between the NPN and PNP sides is what the single-rank TTC/TTA release improved - and exactly what relabeled counterfeits destroy.
- Screen incoming audio power transistors with three practical checks: marking quality under magnification, VBE and hFE spot measurements at a defined collector current, and decapsulation or X-ray for high-value lots whose source history is unknown.
- When moving from 2SC5200 to NJW0281G, re-check the class-AB bias current: the hFE window differs (75-150 versus 55-160) and bias drifts with gain class.
- Moving to the MJL21193 / MJL21194 pair adds dissipation but lowers fT to the 4MHz class - verify stability margins in amplifiers with wide loop bandwidth before a fleet-wide substitution.
- Replace output devices symmetrically per channel: mixing manufacturers or gain ranks across the NPN/PNP pair compromises complementary balance, even when both parts are genuine.
- For the 200W-grade onsemi pair, check the mechanical fit first: TO-3PL / TO-264 is larger than TO-3P(L), and insulator kits and screw patterns differ.
Frequently Asked Technical Questions
Q: Are TTC5200 / TTA1943 the same as 2SC5200 / 2SA1943?
A: Yes - they are the Toshiba continuation versions with identical ratings (230V, 15A, 150W) in the same TO-3P(L) package, with one improvement: a single hFE rank (80-160) instead of multiple gain bins, plus lower output capacitance for better NPN/PNP matching.
Q: Can I replace 2SC5200 / 2SA1943 with NJW0281G / NJW0302G or MJL21193 / MJL21194?
A: Both pairs are used in production repairs. NJW0281G / NJW0302G are the closest electrical match (250V, 15A, 150W, similar speed). MJL21193 / MJL21194 offer more dissipation (200W) but a much lower transition frequency (4MHz class) - fine for output stages, worth checking in fast designs. In both cases re-verify bias and stability after fitting.
Q: Why are counterfeit 2SC5200 so common?
A: Because the part is famous, sells at a premium relative to its die cost, and is bought one pair per channel by DIY builders and repair shops. Relabeled lower-grade dies fail at rail voltage or at bias. Ordering the Toshiba TTC / TTA continuation numbers, or verified lots photographed before dispatch, is the practical defense.